Sigma HRD Serie Manual de usuario

Marca: Sigma

Modelo: HRD Serie

Tipo: Manual de usuario

HRD SERIES

HEATLESS COMPRESSED AIR DRYERS

OPERATOR’S

INSTRUCTION MANUAL

HRD56 – HRD3250

HRD56EM – HRD3250EM

English: 1-1

Español: 2-1

Français: 3-1

Before installation or starting the dryer for the

first time, study this manual carefully to

obtain a clear knowledge of the dryer and of

the duties to be performed while operating

and maintaining the dryer.

RETAIN THIS MANUAL WITH DRYER.

This technical manual contains IMPORTANT

SAFETY DATA and should be kept with the

dryer at all times.

Bulletin 378 (7/00)

HRD and HRD-EM Series (Bulletin 378) 1-1

HRD SERIES

HEATLESS COMPRESSED AIR DRYERS

OPERATOR’S

INSTRUCTION MANUAL

HRD56 – HRD3250

HRD56EM – HRD3250EM

Before installation or starting the dryer for the

first time, study this manual carefully to

obtain a clear knowledge of the dryer and of

the duties to be performed while operating

and maintaining the dryer.

RETAIN THIS MANUAL WITH DRYER.

This technical manual contains IMPORTANT

SAFETY DATA and should be kept with the

dryer at all times.

Bulletin 378 (7/00)

1-2 HRD and HRD-EM Series (Bulletin 378)

Table of Contents

INTRODUCTION.....................................1-3

SAFETY ..........................................1-3

INSTALLATION.....................................1-3

Receiving and Inspection .................................1-3

Handling ..........................................1-3

Ambient Air Temperature .................................1-4

Location and Clearance ..................................1-4

System Arrangement ....................................1-4

Piping and Connections ..................................1-4

Desiccant ..........................................1-5

Mufflers ..........................................1-5

Electrical Connections ...................................1-6

INSTRUMENTATION ..................................1-6

Models HRD56 through HRD3250 ............................1-6

Models HRD56EM through HRD3250EM ........................1-6

Power ON Light ......................................1-6

Vessel Pressure Gauges ..................................1-6

Purge Flow Indicator....................................1-6

Switch-Failure Alarm ...................................1-6

Moisture Indicator .....................................1-6

High-Humidity Alarm (HRD-EM only) ..........................1-6

Compu-Purge (HRD-EM only) ..............................1-7

HOW IT WORKS (HRD SERIES) ...........................1-7

HOW IT WORKS (HRD-EM SERIES) .........................1-8

Compu-Purge Control ...................................1-9

AUTOMATIC DRAIN VALVE (ADV) .........................1-9

START-UP.........................................1-9

Dew Point.........................................1-10

Dew Point Adjustment ..................................1-10

Dew Point Verification ..................................1-11

MAINTENANCE ....................................1-11

Desiccant Dusting.....................................1-11

Shutdown .........................................1-12

Maintenance Schedule ..................................1-12

Daily ...........................................1-12

Weekly ..........................................1-13

Monthly ..........................................1-13

Yearly ...........................................1-13

Returns to Manufacturer .................................1-13

Desiccant Replacement ..................................1-13

Filter Element Replacement ...............................1-14

Servicing The Internal Float Drain Valve (If Equipped) .................1-16

Automatic Drain Valve (ADV) Disassembly and Servicing ...............1-17

High-Humidity Alarm Field Adjustment (HRD-EM only)................1-18

Care of Compu-Purge Sensors ..............................1-19

LCD Display Information ................................1-19

Indicators and Alarms ..................................1-19

FIELD SERVICE GUIDE ...............................1-20

REPLACEMENTPARTS................................A-1

ELECTRICAL SCHEMATICS .............................A-1

INTRODUCTION

HRD Series and HRD-EM (Energy Management) Se

ries heatless desiccant compressed air dryers remove

moisture from compressed air to achieve a standard

pressure dew point of –40°F. Refer to Table 5 for rated

capacity and other dryer specifications. The heatless

dryer supplies a continuous flow of dry compressed air

by alternately cycling the airflow through two desic

cant beds; one adsorbs moisture from the inlet air

while the other is regenerated by a portion of the dry

air from the active bed.

To ensure continuing good dryer performance and safe

operation, everyone who installs, uses or maintains the

dryer must read and carefully follow the instructions in

this manual. Throughout the manual, the word dryer is

used to refer to HRD and HRD-EM Series heatless air

dryers.

SAFETY

HRD and HRD-EM Series dryers are designed and

built with safety as a prime consideration; industry-

accepted safety factors have been used in the design.

Each dryer is checked at the factory for safety and op-

eration. The desiccant vessels are hydrostatically

tested to 1½ times the maximum pressure in accor-

dance with ASME code requirements. A factory-

installed safety relief valve is standard on each dryer.

WARNING

The following safety rules must be observed to

ensure safe dryer operation. Failure to follow

these rules may void the warranty or result in

dryer damage or personal injury.

1. Never install or try to repair any dryer that has

been damaged in shipment. See the Receiving and

Inspection instructions in this manual for appro

priate action.

2. Never operate the dryer at pressures or tempera

tures above the maximum conditions shown on

the data plate.

3. Always supply electrical power that complies

with the voltage shown on the data plate.

4. Never dismantle or work on any component of the

dryer or compressed air system under pressure.

Vent internal air pressure to the atmosphere be

fore servicing.

5. Never perform electrical service on the dryer un

less the main power supply has been discon

nected. Parts of the control circuit may remain

energized when the power switch is turned off.

6. Use only genuine replacement parts from the

manufacturer. The manufacturer bears no respon

sibility for hazards caused by the use of unauthor

ized parts.

Safety instructions in this manual are boldfaced for

emphasis. The signal words DANGER, WARNING

and CAUTION are used to indicate hazard serious

ness levels as follows:

DANGER—Immediate hazard which will result in se

vere injury or death.

WARNING—Hazard or unsafe practice which could

result in severe injury or death.

CAUTION—Hazard or unsafe practice which could

result in minor injury or in product or property dam

age.

The dryer data plate, attached to the electrical control

box, contains critical safety and identification informa

tion. If the data plate is missing or defaced, immediate

ly contact your local distributor for a replacement.

INSTALLATION

Receiving and Inspection

Immediately upon receipt of the dryer, thoroughly in-

spect for damage that may have occurred during ship-

ping. Since the dryer is shipped F.O.B. New Castle,

Delaware, the carrier is legally responsible for damage

incurred during shipping. Shipping damage is not cov-

ered by the dryer warranty.

If goods are received short or damaged, notify the car

rier and insist on a notation of the loss on the face of

the bill of lading. Otherwise no claim can be enforced

against the carrier.

If concealed loss or damage is discovered, notify the

carrier at once and request an inspection. The carrier

will make an inspection and grant a concealed damage

notation. The carrier will not consider any claim for

loss or damage unless an inspection has been made. If

you give the carrier a clear receipt for goods that have

been damaged or lost in transit, you do so at your own

risk and expense.

If there is any damage, file a claim with the carrier,

then call your local distributor for further instructions.

Handling

The dryer is designed to be moved by means of the

shipping skid or the base channels. Handle the dryer

with care and only with equipment capable of lifting

the load.

HRD and HRD-EM Series (Bulletin 378) 1-3

Ambient Air Temperature

Locate the dryer under cover in an area where the am

bient air temperature is between 35°F and 120°F.

Location and Clearance

Install the dryer on a level pad. The dryer is provided

with a minimum

-inch diameter anchor bolt holes.

For dryers 56 through 600 scfm, anchor the dryer to

the floor with four ½-inch diameter bolts with a mini

mum 4-inch thread engagement. For dryers 800 scfm

and larger, anchor the dryer to the floor with four ¾-

inch diameter bolts with a minimum 6-inch thread en

gagement. Allow 24 inches clearance on all sides of

the dryer for servicing. Provide adequate clearance for

prefilter and afterfilter element replacement. Provide

protection for the dryer if it is installed where heavy

vehicles or similar portable equipment is likely to

cause damage.

System Arrangement

Install the dryer downstream of an aftercooler and sep-

arator so that the dryer inlet air is between 60°F and

120°F and contains no liquid water. Liquid water

and/or inlet air temperatures above 100°F can reduce

drying capacity. Contact your local distributor for in-

formation on proper dryer sizing at elevated inlet air

temperatures.

Oil contaminates the desiccant, reducing drying effi-

ciency and desiccant life. An oil-removing filter is in-

stalled at the dryer inlet to protect the desiccant from

oil contaminants. A particulate filter is installed after

the dryer to remove dirt and other solid particles.

Piping and Connections

All external piping must be supplied by the user unless

otherwise specified. Refer to Table 1 for connection

sizes. Inlet and outlet manual shutoff valves and a vent

valve are recommended so the dryer and filters can be

isolated and depressurized for servicing. Refer to Fig

ure 1 for recommended piping layout. The connections

and pipe fittings must be rated for or exceed the maxi

mum operating pressure given on the dryer data plate

and must be in accordance with industry-wide codes.

Table 1

CONNECTIONS

Model

Connections

(inches)

Inlet Outlet

HRD56 / HRD56EM ¾ NPT ½ NPT

HRD100 / HRD100EM 1 NPT ¾ NPT

HRD160 / HRD160EM 1¼ NPT 1 NPT

HRD200 / HRD200EM 1½ NPT 1¼ NPT

Model

Connections

(inches)

Inlet Outlet

HRD275 / HRD275EM 2 NPT 1¼ NPT

HRD350 / HRD350EM 2 NPT 1¼ NPT

HRD475 / HRD475EM 2 NPT 1½ NPT

HRD600 / HRD600EM 2½ NPT 2 NPT

HRD800 / HRD800EM 3 NPT 2½ NPT

HRD1000 / HRD1000EM 3 NPT 2½ NPT

HRD1200 / HRD1200EM 3 NPT 3 NPT

HRD1450 / HRD1450EM 3 NPT 3 NPT

HRD1710 / HRD1710EM 4 NPT 3 NPT

HRD2010 / HRD2010EM 4 FLG 4 FLG

HRD2250 / HRD2250EM 4 FLG 4 FLG

HRD2600 / HRD2600EM 4 FLG 4 FLG

HRD3250 / HRD3250EM 6 FLG 4 FLG

Be sure all piping is supported. Do not allow the

weight of any piping to bear on the dryer or filters.

Piping must be the same size as or larger than the

dryer connections. Piping smaller than the dryer con-

nections will cause high pressure drop and reduce dry-

ing capacity.

If the purge exhaust muffler piping must be extended

outside the dryer area, the piping must be sized so that

it will cause no more than 0.25 psig back pressure.

Back pressure reduces the capacity of the dryer.

1-4 HRD and HRD-EM Series (Bulletin 378)

Figure 1

RECOMMENDED PIPING LAYOUT

Consult your local distributor for piping details if re

quired.

Dryer bypass piping may be installed to allow uninter

rupted airflow during servicing. If the downstream ap

plication cannot tolerate unprocessed air for short

periods, install a second dryer in the bypass line.

CAUTION

Do not hydrostatically test the piping with the

dryer in the system. The desiccant will be

damaged if saturated with water.

Desiccant

HRD and HRD-EM Series dryers use activated alu

mina as the desiccant in the dryer vessels.

Models 56 through 600 scfm are shipped with acti

vated alumina in the dryer vessels. Activated alumina

is shipped loose with all other standard models.

All desiccant shipped loose must be added to the

dryer vessels before the dryer is put into service.

Refer to Table 2 for quantity per vessel.

Table 2

DESICCANT REQUIREMENTS

Dryer Model No

Activated Alumina

(lbs per vessel)

HRD56 / HRD56EM 31

HRD100 / HRD100EM 60

HRD160 / HRD160EM 95

HRD200 / HRD200EM 120

HRD275 / HRD275EM 165

HRD350 / HRD350EM 210

HRD475 / HRD475EM 285

HRD600 / HRD600EM 366

HRD800 / HRD800EM 475

HRD1000 / HRD1000EM 600

HRD1200 / HRD1200EM 725

HRD1450 / HRD1450EM 880

HRD1710 / HRD1710EM 1,025

HRD2010 / HRD2010EM 1,200

HRD2250 / HRD2250EM 1,366

HRD2600 / HRD2600EM 1,567

HRD3250 / HRD3250EM 1,975

To add desiccant:

WARNING

The following procedure provides instructions

for adding the initial desiccant to the vessels. If

replacing desiccant, refer to the instructions

on page 1-13.

1. Verify pressure gauges of both vessels indicate 0

psig. If not, depressurize the vessels according to

the shutdown instructions on page 1-12.

2. Remove the pipe plug from the desiccant fill port

at the top of each vessel. Refer to the dryer label

for the schematic depicting the fill port location.

CAUTION

Pouring desiccant creates a fine dust; safety

goggles, gloves and dust mask should be

worn by personnel installing desiccant. Refer

to the Material Safety Data Sheet (MSDS) on

page 1-23 for more complete information.

Do not tamp the desiccant in vessels. Tamping

damages desiccant and causes dusting.

3. Carefully pour activated alumina into the vessels

through the fill port.

4. Tap the vessels with a rubber mallet to ensure uni-

form distribution of the desiccant.

5. Replace the plugs in the fill port connections.

Mufflers

Purge exhaust mufflers are supplied with every dryer.

If they are not factory installed, they must be screwed

into the purge exhaust connection on the lower mani

fold piping before the dryer is operated. Desiccant

dusting may cause a restriction in the purge exhaust

muffler shortly after start-up. Depending on the dryer

model, the muffler cores may be in the control enclo

sure or strapped to a vessel leg. For additional infor

mation see Desiccant Dusting in the Maintenance

section, page 1-11.

WARNING

Operating dryer without mufflers will cause

noise levels exceeding OSHA standards.

Remove mufflers only for servicing and

maintenance and only after internal pressure

of dryer has been completely vented to

atmosphere.

HRD and HRD-EM Series (Bulletin 378) 1-5

Electrical Connections

The dryer is prewired, ready for use. Connect the dryer

to the power supply specified on the data plate. Con

nections, marked L1 and L2, are on a terminal strip in

side the electrical box. Make connections through the

plugged hole (identified by a tag) on the bottom right

of the box.

DANGER

Ground the dryer using the connection

supplied inside the electrical box. Refer to the

electrical schematic at the back of this manual

for connection details.

Important Note: Do not switch power to the dryer

on and off via a remote disconnect. To avoid dryer

malfunction, power to the unit must be switched on

and off using the switch on the dryer control panel.

INSTRUMENTATION

The following instrumentation helps in monitoring

dryer operation and performance. Instruments which

are available on either the HRD or HRD-EM (energy

management) are so noted.

Models HRD56 through HRD3250

HRD Series dryers are rated NEMA 1 and include fol-

lowing:

• Power ON light

• Vessel pressure gauges

•

Purge flow indicator

•

Switch-Failure Alarm

•

Moisture Indicator

Models HRD56EM through HRD3250EM

HRD-EM Series dryers are rated NEMA 4 and include

the following:

•

Power ON light

•

Vessel pressure gauges

•

Purge flow indicator

•

Switch-Failure Alarm

•

High-Humidity Indicator

•

Compu-Purge

•

Digital Display

•

Moisture Indicator

•

Audible alarm with auxiliary contacts

Power ON Light

The power ON light on the control panel indicates

when the dryer is turned on and operating.

Vessel Pressure Gauges

A gauge mounted on the gauge bracket indicates

which vessel is onstream and which is regenerating.

The gauge for the onstream vessel indicates operating

pressure; the gauge for the regenerating vessel indi

cates 0 psig.

Purge Flow Indicator

A gauge mounted on the gauge bracket of the dryer in

dicates purge air pressure as an approximate measure

of purge airflow when used with the calibration graph

shipped with the dryer. To approximate purge airflow,

locate the pressure gauge reading (psig) on the hori

zontal axis of the graph. Follow the pressure upward

until it intersects the calibration curve. Follow this

point to the left until it intersects the vertical axis. This

point on the vertical axis is approximately the purge

airflow.

Switch-Failure Alarm

Pressure sensors located on each vessel trigger both

audible and visible alarms if a vessel does not depres-

surize at the completion of its drying cycle. A red

light, labeled SWITCH FAILURE, is located on the

electrical panel. A time-delay relay is included sepa-

rately in the dryer packaging. The relay must be

mounted into the electrical panel before start-up. The

electrical schematic at the back of this manual gives

wiring details.

Moisture Indicator

A color-change moisture indicator is shipped sepa

rately in a moisture-proof bag. The moisture indicator

should be installed in a customer-supplied 1¼-inch

NPT threaded port at the dryer outlet. The indicator is

green when dry. The color changes to yellow when the

relative humidity of the dryer outlet air is approxi

mately 4%-5%. This indicator is intended only as an

inexpensive means of determining possible dryer mal

function.

High-Humidity Alarm (HRD-EM only)

A moisture sensor in the dryer outlet manifold moni

tors the relative humidity of the outlet air. The sensor

triggers audible and visible alarms if the relative hu

midity of the outlet air exceeds the factory setting. The

audible alarm is located near the control enclosure. A

red light, labeled HIGH HUMIDITY, is located on the

electrical panel. A set-plug adjustment bulb (refer to

Figure 9) is included for use in calibrating the

1-6 HRD and HRD-EM Series (Bulletin 378)

high-humidity alarm. Contacts for remote annunciators

are connected to the terminal strip in the electrical en

closure; refer to the electrical schematic for terminal

numbers. Refer to the maintenance section of this

manual for field adjustment instructions.

Compu-Purge (HRD-EM only)

Indicators

HRD-EM Series dryers are equipped with

Compu-Purge

control which has an indicating panel

(Figure 2) on the door of the main electrical box.

These indicators help in monitoring dryer operation

and performance. If the dryer malfunctions, first check

this panel to determine the cause of the problem.

Light Function

Power ON

Lights when switch is in “ON” position

and power is supplied to dryer.

Variable Purge

Mode

Lights when drying cycle is controlled

by the microcomputer.

High Inlet Air

Temperature

Lights when inlet air temperature ex

ceeds 120°F. Excessive inlet air tem

perature significantly decreases

drying capacity and may result in

higher dew point.

Dryer Overload

Lights when inlet dryer load exceeds

dryer ability to maintain dew point.

Low Inlet Air

Pressure

Lights when inlet air pressure is less

than 65 psig. See Maintenance sec-

tion (page 1-11) for additional infor-

mation.

Sensor

Malfunction

Lights when temperature or pressure

sensor sends the microcomputer a

reading which is outside the normal

range of the sensor. See Maintenance

section (page 1-11) for additional in

formation.

High Humidity

Lights when the high humidity moni

tor senses excessive moisture in the

outlet air. High humidity may result

when dryer is slugged with water.

Failure-to-Switch

Lights if airflow fails to alternate be

tween desiccant vessels at desig

nated switching time. Failure to switch

causes desiccant saturation, resulting

in higher dew point.

Liquid Crystal Digital (LCD) Display

The LCD display is above the indicating panel on the

main electrical box. It displays “INLET AIR TEM

PERATURE” (°F) and “ENERGY SAVINGS” as a

percent of dryer capacity. See Maintenance section,

page 1-11, for complete description of additional read

outs.

Audible Alarm

Indicates high-humidity and failure-to-switch alarm

condition.

Remote Contacts

Powered 120 volt, normally open, contacts (1 amp

max.) are furnished to allow hookup of remote audible

or visible system malfunction alarms. Hookup contacts

are identified by a tag on the bottom center of the elec-

trical box.

HOW IT WORKS (HRD SERIES)

HRD Series heatless dryers provide a continuous sup

ply of dry compressed air by automatically cycling the

flow of air through two desiccant beds. While one bed

is adsorbing moisture from the inlet air, the other bed

is being reactivated by a portion of the dried air. Cy

cling is controlled by a cam timer. Figure 3 shows the

airflow through the dryer with vessel A onstream and

vessel B being reactivated.

Saturated air enters the prefilter which separates oil

mists, liquid oil, water and particulates from the air

stream. Separated contaminants are discharged

through the prefilter drain. With purge valve E closed,

filtered air flows through shuttle valve S into the bot

tom of vessel A; moisture is removed from the air

stream by the desiccant. Dry air exits the top of the

vessel and divides into two streams: process air exits

through the shuttle valve T, passes through the particu

late afterfilter and continues to the process.

HRD and HRD-EM Series (Bulletin 378) 1-7

Figure 2

COMPU-PURGE

INDICATING PANEL

A portion of the dried air (purge air) is metered

through orifice C and reduced to atmospheric pressure

by orifice D, greatly expanding its volume. The ex

panded purge air flows down through vessel B and out

through the purge valve F and muffler, carrying away

moisture adsorbed by the desiccant in the previous cy

cle.

The dryer operates this way for approximately four

minutes. Then purge valve F closes, allowing vessel B

to gradually repressurize for approximately one minute

before the cycle changes. The cycle timing sequence

will vary depending on operating pressure. At

switchover, purge valve E opens to depressurize vessel

A. This causes shuttle valves S and T to shift so that

vessel B is onstream and vessel A is being reactivated.

HOW IT WORKS (HRD-EM SERIES)

Figure 4 shows the airflow through the dryer with ves

sel A drying and vessel B regenerating.

Saturated air enters the prefilter which separates oil

mists, liquid oil, water and particulates from the

airstream. Separated contaminants are discharged

through the prefilter drain. With exhaust valve C open

and D closed, filtered air enters the inlet shuttle valve

and is directed through vessel A, where moisture is ad

sorbed by the desiccant. Dry air exits the vessel, passes

through the outlet shuttle valve and divides into two

streams. The process air passes through the particulate

afterfilter and continues to the process.

A portion of the dried air passes through the purge ori

fice at approximately atmospheric pressure and passes

downward through vessel B, where it desorbs moisture

from the desiccant. Wet purge air exhausts to the at

mosphere through exhaust valve C and muffler E.

When regeneration is complete, exhaust valve C closes

and vessel B is repressurized to dryer operating pres

sure. Vessel B is completely regenerated and

repressurized, ready for the next drying cycle.

1-8 HRD and HRD-EM Series (Bulletin 378)

Figure 3

AIRFLOW SCHEMATIC (HRD Series)

Figure 4

AIR FLOW SCHEMATIC (HRD-EM Series)

At the end of the drying period, exhaust valve D

opens, vessel A depressurizes, inlet and outlet shuttle

valves shift, inlet flow switches to vessel B and the

drying/regenerating cycle is repeated.

Inlet air continues to flow through one vessel for half

of the standard 10-minute cycle.

Compu-Purge Control

Compu-Purge control uses a microcomputer to adjust

the purge airflow rate and drying cycle to automati

cally match purge air to the inlet moisture load.

Electronic temperature and pressure sensors continu

ously track inlet temperature and inlet and outlet pres

sure and transmit these to the microcomputer. The

microcomputer calculates the dryer load and the most

efficient combination of purge flow rate and duration

to regenerate the moisture adsorbed during the drying

period.

Purge flow rate can be varied from 0 to 20% in incre

ments of 5% by purge control valves 1 and 2. Purge

duration can also be varied. The optimum combination

of purge control valve openings is automatically se-

lected by the microcomputer to supply only as much

purge air as needed for complete regeneration.

When the amount of purge air required to regenerate

the desiccant is more than 20% of the inlet flow, the

dryer will operate on a shortened cycle until the over-

load condition is corrected. The dryer will operate on a

5-minute cycle when in the Overload Mode.

The microcomputer uses three modes of dryer opera-

tion to match the inlet moisture load:

•

Compu-Purge Mode – When the microcom

puter adjusts purge air to match dryer load re

quirements, the dryer is operating in the

Compu-Purge mode.

•

Standby Mode – When there is low or no de

mand for air, the dryer operates in a standby

mode: the dryer purges until the desiccant is re

generated, the vessels repressurize, then the

dryer automatically shuts down; the dryer

purges every 30 minutes to assure dew point

performance.

•

Fixed-Cycle Mode – If all sensors malfunction,

the “Variable Purge Mode” light will turn off

and the dryer will automatically operate in a

fixed cycle mode, using 15% of the design air

flow to regenerate the offstream vessel. If only

one sensor malfunctions, the dryer will default

to standard conditions for that sensor and con

tinue to operate in the Variable Purge Mode.

See Maintenance section, page 1-11, for addi

tional information.

AUTOMATIC DRAIN VALVE (ADV)

Dryers rated 200 scfm and larger are equipped with an

electronic drain valve that automatically discharges

condensate from the prefilter.

The ADV has two LED indicators and a test button to

help verify operation. Pushing the test button causes

the drain port to click open. One LED indicates that

power is supplied to the ADV; the other LED indicates

that the drain port is open. The power indicator turns

off when the drain port opens. If either LED fails to

turn on at the proper time, refer to the maintenance

section of this manual. If the dryer is under warranty,

call your local distributor for authorization before

servicing.

ADV operation is controlled by an electronic timer.

The drain opening can be set from 0.5 to 10 sec. The

drain cycle can be set from 0.5 to 45 min.

To minimize air losses, the timer should be adjusted to

open the port just long enough to discharge accumu-

lated condensate. The timer is properly set if nothing

but air vents at the end of the open period. If air vents

for more than a few seconds, set the timer for a longer

cycle or shorter drain opening. If liquid is still dis-

charging when the port closes, set the timer for a

shorter cycle or longer drain opening.

START-UP

Once your HRD/HRD-EM Series dryer has been in

stalled according to instructions, it is ready for start-

up.

To start the dryer:

1. Close customer-supplied shutoff valve at dryer in

let.

2. Open customer-supplied bypass valve, if installed.

3. Close customer-supplied letdown and shutoff

valves at dryer outlet.

4. Supply compressed air up to inlet shutoff valve.

5. Slowly open inlet shutoff valve and wait for dryer

to reach operating pressure. Pressure gauges on

both dryer vessels will indicate operating pres

sure.

6. Check all piping connections for air leaks. Rem

edy leaks before continuing start-up.

7. For HRD Series dryers:

HRD and HRD-EM Series (Bulletin 378) 1-9

•

Turn on the power switch located on the control

enclosure. Depending on the position of the

switching valve and specified operating pres

sure, one of the vessels will depressurize, or

both vessels will remain pressurized for up to

90 seconds, then one will depressurize.

•

Operate the dryer for three cycles to verify sat

isfactory operation. The dryer cycle is 10 min

utes with each vessel onstream for five minutes.

8. For HRD-EM Series dryers:

•

Turn on power switch on electrical box.

•

When power switch is turned on “power on”

light will light. Both vessels will remain at

pressure for up to 60 seconds, then one will

depressurize and the green “Variable Purge”

light will light.

•

The LCD display will show in sequence:

DELTECH ENGINEERING, L.P., COPYRIGHT

1988...1991

INLET TEMP. 99° ENERGY SAVINGS = 80%

NO MALFUNCTIONS EXIST

FIRST CYCLE OF OPERATION

USING DEFAULT VALUES

During the next five minutes, the microcom-

puter will check itself for any malfunctions.

The dryer will operate in a fixed-cycle mode,

using 15% purge, during start-up.

At the end of this period, dryer operation will

be computer-controlled, the “Variable Purge

Mode” light will be on and the microcomputer

will automatically control purge rate to match

the dryer load.

The LCD display will show:

INLET TEMP XX ENERGY SAVINGS = XX%

NO MALFUNCTION EXISTS

If there is low or no demand for compressed

air, the dryer will go into the standby mode.

(See Compu-Purge Control section.)

The LCD display will show:

NO LOAD ON DRYER

IN STANDBY MODE: SAVING PURGE AIR

•

Turn alarm silencer switch on front of electrical

box to “ON.”

9. Slowly open the outlet shutoff valve.

10. Close customer-supplied bypass valve.

Dew Point

The pressure dew point of the outlet air is controlled

by the amount of purge air used for reactivation. Purge

airflow is continuous and is adjustable within a set

range. The dew point can be manually adjusted ±20

degrees (depending on operating conditions) using the

purge adjustment valve. Closing the valve will result

in a higher dew point. Opening the valve will result in

a lower dew point. Dryer installation and start-up must

be completed before the purge valve is adjusted.

For applications requiring dew points outside this

range, contact your local distributor.

Dew Point Adjustment

After your dryer has been installed and the start-up

procedure completed, adjust the dryer for a –40°F dew

point as follows.

1. Determine air pressure (psig) at the dryer inlet.

2. Refer to Table 3. For your model and inlet air

pressure, determine the inlet airflow and average

purge rate (% of inlet air) required to produce a

–40°F dew point.

3. Calculate the required purge flow (scfm):

Purge Flow = Purge Rate x Inlet Flow

4. Refer to the purge flow calibration graph shipped

with the dryer. On the graph, locate the average

purge airflow (calculated in Step 3) and the corre-

sponding purge adjustment valve setting (psig).

5. Manually adjust the purge adjustment valve at the

top of the dryer until the correct setting is indi

cated on the gauge. For dryers 55 thru 160 , adjust

the purge as follows:

DANGER

Do not remove the petcock base from the

shuttle valve.

•

Unscrew and remove the petcock wing from the

petcock base on the shuttle valve at the top of

the dryer (see

Figure 5).

•

Insert a

-inch

allen wrench

through the pet

cock base to the

set screw.

•

Adjust the set

screw until the

pressure on the

purge gauge cor

1-10 HRD and HRD-EM Series (Bulletin 378)

Figure 5

Cutaway of Shuttle Valve

responds to the desired purge rate as indicated

on the purge flow calibration graph. Turn the set

screw counterclockwise to increase the purge

flow; clockwise to decrease the purge flow.

•

Remove the allen wrench.

•

Replace the petcock wing.

CAUTION

Inlet air temperatures higher than 100°F will

reduce the design dew point of the dryer.

The dryer can now be put into service. No further ad

justments are necessary unless there are changes in op

erating conditions. Within limits, changes in inlet flow

rate can be compensated for by adjusting the purge ad

justment valve (repeat Steps 1 through 5 above).

Dew Point Verification

After the dryer has operated for a minimum of five

days, check the dew point of the outlet air with a pres-

sure dew point instrument. Follow the directions for

the instrument used.

Use only metallic tubing when checking dew point

since plastics, rubber and similar materials absorb

moisture from the ambient air and give false readings.

MAINTENANCE

Desiccant Dusting

The dryer vessels for models 56 through 600 scfm are

shipped filled with desiccant. Some dusting will occur

from movement of the desiccant during shipping. Dust

carried by the purge air eventually plugs the mufflers

preventing complete depressurization of the offstream

vessel and proper airflow switching. When this occurs,

the muffler cores must be replaced. Replace muffler

cores when the pressure gauge on the offstream vessel

indicates a pressure higher than 0 psig. Replacement

interval depends on dryer usage and the quantity of

desiccant dust formed.

HRD and HRD-EM Series (Bulletin 378) 1-11

Table 3

INLET AIRFLOW AT VARIOUS INLET AIR PRESSURES

Model

Inlet Air Pressure (psig)

30 40 50 60 70 80 90 100 110 125 150

Average Inlet Airflow (scfm)

HRD56 / HRD56EM 21 26 31 36 41 45 50 55 60 67 79

HRD100 / HRD100EM 39 48 56 65 74 83 91 100 109 122 144

HRD160 / HRD160EM 62 76 90 104 118 132 146 160 174 195 230

HRD200 / HRD200EM 78 95 113 130 148 165 183 200 217 244 287

HRD275 / HRD275EM 107 131 155 179 203 227 251 275 299 335 395

HRD350 / HRD350EM 136 167 197 228 258 289 319 350 381 426 503

HRD475 / HRD475EM 185 227 268 309 351 392 434 475 516 579 682

HRD600 / HRD600EM 234 286 338 391 443 495 548 600 652 731 862

HRD800 / HRD800EM 312 382 451 521 591 661 730 800 870 974 1149

HRD1000 / HRD1000EM 390 477 564 651 738 826 913 1000 1087 1218 1436

HRD1200 / HRD1200EM 468 572 677 782 886 991 1095 1200 1305 1462 1723

HRD1450 / HRD1450EM 565 691 818 944 1071 1197 1324 1450 1576 1766 2082

HRD1710 / HRD1710EM 666 815 965 1114 1263 1412 1561 1710 1859 2083 2455

HRD2010 / HRD2010EM 783 959 1134 1309 1484 1660 1835 2010 2185 2448 2886

HRD2250 / HRD2250EM 877 1073 1269 1465 1662 1858 2054 2250 2446 2740 3231

HRD2600 / HRD2600EM 1013 1240 1467 1693 1920 2147 2373 2600 2827 3167 3733

HRD3250 / HRD3250EM 1267 1550 1833 2117 2400 2683 2967 3250 3533 3958 4667

Average Purge Rate

(% inlet air)

38.5 31.5 26.6 23.0 20.3 18.2 16.4 15.0 13.8 12.3 10.4

Maximum inlet air pressure, 150 psig. Higher pressures available as an option on some models; consult your local distributor

Based on 100°F inlet air temperature and –40°F pressure dew point. Maximum recommended inlet temperature, 120°F. For capacity at inlet temperature higher than

100°F, consult your local distributor.

CAUTION

The desiccant beds may fluidize at excessive

airflow rates. Refer to Table 3, page 1-11.

Airflow surges may also cause fluidization.

Surges may occur if the dryer is not started in

accordance with instructions or if the dryer is

located downstream of a receiver.

Conditions that cause fluidization must be

avoided. Fluidization causes excessive

dusting and rapid degradation of the

desiccant, reducing its effective life. Desiccant

dusting causes valves to wear and malfunction

and filters to plug up rapidly.

Shutdown

If the dryer or the air system is shut down desiccant

life can be prolonged by venting the dryer internal

pressure to the atmosphere.

To vent dryer pressure:

1. Turn the power switch OFF.

DANGER

EXPLOSION HAZARD

Dismantling or working on any component of

the compressed air system under pressure

may cause equipment damage and serious

injury. Before dismantling any part of the dryer

or compressed air system, completely vent the

internal air pressure to the atmosphere.

2. Open the customer-supplied bypass valve (if in

stalled).

3. Close the customer-supplied shutoff valve down

stream of the dryer.

4. Close the customer-supplied shutoff valve up

stream of the dryer.

5. Slowly open the customer-supplied depressuriza

tion valve to vent the dryer internal air pressure.

6. When the internal air pressure is 0 psig, close the

depressurization valve.

Restart the dryer according to the start-up instructions

on page 1-9.

If electrical maintenance must be performed on the

dryer, electrical power to the dryer must be locked out

and tagged in accordance with OSHA requirements.

DANGER

SHOCK HAZARD

Portions of the electrical control circuit remain

energized when the power switch is turned

OFF. Disconnect the main power supply to the

dryer before performing maintenance on the

electrical system.

Before performing electrical maintenance:

1. Turn the power switch off.

2. Disconnect the main power supply.

Maintenance Schedule

The following periodic checks should be made to

monitor dryer operation. These inspections will help

you schedule servicing to ensure continuing good

dryer performance and safe operation. Maintenance

kits are available from your local distributor (see page

A-1 for a description of each kit.

Action Schedule

Check automatic drain valve Daily

Check system monitor lights Daily

Check filter differential pressure indicators Weekly

Check exhaust mufflers Weekly

Check purge exhaust valves Weekly

Inspect internal float drain on filters (if equip-

ped)

Monthly

Inspect desiccant Yearly

Replace solenoid and butterfly valve dia

phragms and seats

Yearly

Replace prefilter and afterfilter elements. Yearly

CAUTION

Contact your local distributor before doing any

work on the solid state controls. Attempting to

service circuit boards or components may

result in equipment damage and will void the

warranty.

Daily

1. For dryers rated 600 to 3,250 scfm, check the fil

ter above the dryer inlet.

2. Check automatic drain valve on prefilter (if

equipped) for discharge. If no condensate dis

charges from drain valve, follow Shutdown proce

dure (page 1-12), then dismantle and clean, repair

or replace drain valve as required.

1-12 HRD and HRD-EM Series (Bulletin 378)

3. Check the switch-failure alarm light on the control

panel. If the light is on, refer to the Field Service

Guide for remedy.

4. Check the color of the moisture indicator in the

dryer outlet. When the dryer is functioning nor

mally, the indicator is green. If the indicator is

yellow, refer to the Field Service Guide, page

1-20, for remedy.

For HRD-EM Series only:

5. Check system monitoring lights on bottom half of

indicating light panel. If any light is lit, see expla

nations in Indicators section, page 1-7, for diagno

sis and Field Service Guide, page 1-20, for

remedy.

6. Check the high-humidity alarm light on the con

trol panel. If the light is on, refer to the Field Ser

vice Guide for remedy.

Weekly

1. Check prefilter and afterfilter differential pressure

indicators. Replace filter elements in accordance

with manufacturer’s directions.

2. Check exhaust muffler for discharge of air from

regenerating vessel. If no air discharges, disman-

tle and clean or replace muffler core. If no air dis-

charges when muffler is removed, call your local

distributor.

3. Check purge valves for leakage. Rebuild if any

leakage is evident.

Monthly

Inspect the internal float drain valve (if equipped)

every two to three weeks for excessive oil and water

by pressing the test valve on the bottom of the filter

unit. If more than one or two drops of oil leak out, the

drain valve should be cleaned or replaced as required.

Yearly

Note

Maintenance kits for yearly preventive

maintenance are available from your local

distributor. See Appendix A for the

maintenance kit part numbers.

1. Inspect desiccant in dryer vessels. Depressurize

dryer according to Shutdown section of this man

ual. Check for the following and correct as indi

cated:

•

Oil Contamination

If desiccant is contaminated with oil, check

drain valve on prefilter. Clean, repair or replace

drain valve as necessary. Replace prefilter ele

ment, then replace desiccant.

•

Broken Desiccant (excessive dusting)

Desiccant dusting may be caused by air flow

surges, excessive air flow or pulsating air pres

sure. Check and correct these conditions, then

replace desiccant.

2. Replace all solenoid and butterfly valve dia

phragms and seats.

3. Replace all prefilter and afterfilter elements.

Returns to Manufacturer

If the dryer or a component of the dryer must be re

turned to the manufacturer, first call your local dis

tributor for a return authorization number and a

shipping address. Your distributor will inform you

whether the dryer or only the component must be re

turned.

Desiccant Replacement

All dryers use activated alumina desiccant. To ensure

consistent dryer performance and to prevent excessive

dusting or premature desiccant breakdown, use only

factory-approved grades of activated alumina when re-

placing desiccant.

To replace desiccant:

DANGER

EXPLOSION HAZARD

Completely vent the internal air pressure to the

atmosphere before replacing the desiccant or

performing any maintenance work on your

dryer.

1. Depressurize dryer according to the shutdown in

structions (page 1-12). Pressure gauges on both

vessels must indicate 0 psig before service contin

ues.

2. Turn off power switch on control panel.

DANGER

SHOCK HAZARD

Portions of the electrical control circuit remain

energized when the power switch is turned

OFF. Disconnect the main power supply to the

dryer before performing maintenance on the

electrical system.

3. Disconnect the main power supply to the dryer.

4. Lock out and tag electrical power supply in accor

dance with OSHA requirements.

HRD and HRD-EM Series (Bulletin 378) 1-13

5. Place large containers under drain outlets at bot-

tom of vessels to collect desiccant.

6. Remove desiccant drain plug (refer to Figure 6).

7. Tap sides of vessels with rubber mallet to loosen

desiccant.

8. Remove fill plug at top of each vessel.

9. Shine flashlight through fill port and inspect in

side of vessels to be sure all desiccant is removed.

10. Replace desiccant drain plug.

11. Determine the amount of desiccant according to

Table 2, page 1-5.

CAUTION

Pouring desiccant creates a fine dust; safety

goggles, gloves and dust mask should be

worn by personnel installing desiccant. Refer

to the Material Safety Data Sheet (MSDS) on

page 1-23 for more complete information.

Do not tamp the desiccant in vessels. Tamping

damages desiccant and causes dusting.

12. Pour required desiccant into vessels through fill

ports.

13. Replace fill plugs at top of vessels.

Restart the dryer according to the start-up instructions

on page 1-9.

Filter Element Replacement

Coalescing and particulate filters are included with all

dryers. The filter elements should be replaced when

the D P gauge on top of the filter reads 7 to 10 or once

a year, whichever comes first. Refer to Table 4 for the

replacement element part numbers. Replace elements

in accordance with the following instructions.

Table 4

REPLACEMENT ELEMENTS

DRYER MODEL NO.

REPLACEMENT ELEMENT

PART NO.

Coalescing

Prefilter

(CHE Series)

Particulate

Afterfilter

(PC Series)

HRD56 / HRD56EM 39240908 39241104

HRD100 / HRD100EM 39240916 39241112

HRD160 / HRD160EM 39240924 39241138

HRD200 / HRD200EM 39240932 39241146

HRD275 / HRD275EM 39240940 39241146

HRD350 / HRD350EM 39240940 39241153

HRD475 / HRD475EM 39240940 39241179

HRD600 / HRD600EM 39240957 39241179

HRD800 / HRD800EM 39240973 39241187

HRD1000 / HRD1000EM 39240973 39241195

HRD1200 / HRD1200EM 39240981 39241203

HRD1450 / HRD1450EM 39240965 (Qty 2) 39241187 (Qty 2)

HRD1710 / HRD1710EM 39240973 (Qty 2) 39241195 (Qty 2)

HRD2010 / HRD2010EM 39252440 39252580

HRD2250 / HRD2250EM 39252457 39252598

HRD2600 / HRD2600EM 39252465 39252606

HRD3250 / HRD3250EM 39252473 39252614

Dryers rated 56 to 1,200 scfm:

DANGER

Vent internal pressure to atmospheric

pressure before performing any maintenance.

1. Vent internal pressure to the atmosphere. Refer to

Shutdown instructions on page 1-12.

2. Disconnect drain lines at manual and automatic

drain valves (if installed).

1-14 HRD and HRD-EM Series (Bulletin 378)

Figure 6

DESICCANT DRAIN/FILL PORTS

(Side View of Dryer)

DANGER

A “hissing” sound while the bowl is being

removed indicates the filter has not been

properly depressurized. DO NOT continue to

remove the bowl until the filter has been

completely vented to atmospheric pressure.

CAUTION

Filter bowls may be heavy. Caution should be

taken when removing the bowl.

3. Remove the bottom bowl by unscrewing it from

the head. A strap wrench may be needed.

4. Remove the element from the filter head with a

brisk downward pull, or by working the element

back and forth and pulling down until it snaps

free. Discard the element in accordance with ap

plicable regulations. Used elements typically hold

contaminants, such as compressor lubricants and

particulate matter.

Note: The element may be unsnapped by DPin

normal operation. This will not affect filtra-

tion, as the O-ring on the element maintains a

positive seal.

5. Clean accumulated debris from the bowl with

soap and water, and dry thoroughly.

CAUTION

Lubricate the O-ring with a petroleum-based

lubricant compatible with your application.

6. Lightly lubricate the new O-ring before installing

the new element.

7. Insert new element, snapping it into place with a

firm push up into the head. The element will hang

from the head until the bowl is installed.

CAUTION

Lubricate the O-ring with a petroleum-based

lubricant compatible with your application.

8. Lightly lubricate the housing O-ring.

CAUTION

Do not use a pipe wrench to tighten the filter

bowl to the head.

9. Reattach bowl to head and hand tighten. As the

bowl is threaded onto the head, supports in the

bottom of the bowl ensure a proper seal between

the element and the filter head.

10. Reattach drain lines (if applicable).

11. Record the date of the element change in a record

book or on the provided “Maintenance Reminder”

label. A new element

change label with the up-

dated information should

be applied over the pre

vious label each time the

element is replaced.

Restart the dryer according to the start-up instructions

on page 1-9.

Dryers rated 1,450 to 3,250 scfm:

DANGER

Vent internal pressure to atmospheric

pressure before performing any maintenance.

1. Vent internal pressure to the atmosphere. Refer to

Shutdown instructions on page 1-12.

2. Disconnect drain lines at automatic drain valve (if

installed).

3. Remove bolts securing the filter top to the vessel.

4. Remove the filter top.

5. Remove the element retainer plate.

HRD and HRD-EM Series (Bulletin 378) 1-15

Figure 7

Filter

6. Remove the used element cartridges. Discard the

element in accordance with applicable regula-

tions. Used elements typically hold contaminants,

such as compressor lubricants and particulate mat-

ter.

7. Insert new element cartridges in filter.

8. Replace the element retainer plate.

9. Replace filter top.

10. Reinstall bolts to secure filter top.

11. Reattach drain lines (if applicable).

12. Record the date of the ele

ment change in a record

book or on the provided

“Maintenance Reminder”

label. A new element

change label with the up

dated information should be

applied over the previous

label each time the element

is replaced.

Restart the dryer according to the start-up instructions

on page 1-9.

Servicing The Internal Float Drain Valve (If

Equipped)

DANGER

Vent internal pressure to atmospheric

pressure before performing any maintenance.

1. Vent internal pressure to the atmosphere. Refer to

Shutdown instructions on page 1-12.

2. Disconnect drain lines and automatic drain valves

(if installed).

DANGER

A “hissing” sound while the bowl is being

removed indicates the filter has not been

properly depressurized. DO NOT continue to

remove the bowl until the filter has been

completely vented to atmospheric pressure.

CAUTION

Filter bowls may be heavy. Take caution when

removing the bowl.

3. Remove the bottom bowl by unscrewing it from

the head. A strap wrench may be needed.

4. Remove the nut from the bottom of the bowl.

5. Turn the bowl upside down. The float drain will

fall out.

6. Inspect the drain for damage. Replace if necessary

or clean with a mild soap and water. Do not use

solvents to clean the drain valve as they may dam

age the valve.

7. Hold the bowl upright and drop in the new or

cleaned drain so that the drain stem is through the

hole at the bottom of the filter.

8. Replace the nut and hand tighten.

CAUTION

Do not use a pipe wrench to tighten the filter

bowl to the head.

9. Reattach bowl to head and hand tighten.

10. Reattach the drain line (if applicable).

Restart the dryer according to the start-up instructions

on page 1-9.

1-16 HRD and HRD-EM Series (Bulletin 378)

Figure 8

Filter

Automatic Drain Valve (ADV) Disassembly

and Servicing

Dryers rated 200 scfm and larger have a timer-

controlled automatic drain valve.

CAUTION

Do not disassemble the ADV timer or attempt

to repair electrical parts. Replace timer if

defective.

The ADVs discharge condensate through a full-port

drain opening. The valve body may need to be cleaned

under conditions of gross particulate contamination.

To disassemble the ADV valve body for cleaning or

other maintenance (refer to Figure 9):

1. Turn power switch off.

2. Disconnect main power supply to dryer.

3. Lock out and tag power supply in accordance with

OSHA requirements.

WARNING

If power supply is not disconnected before

disassembly, serious personal injury and

valve damage may result.

4. Remove hose that connects the ADV to the filter.

5. Remove screw and washer from front of ADV.

6. Remove the power supply connector and gasket

(with the timer assembly, if attached) from the so

lenoid coil housing. Do not damage or lose the

gasket.

7. Remove 13 mm nut and spring washer from top of

solenoid coil housing.

8. Lift solenoid coil housing off solenoid core in

valve body.

9. Unscrew solenoid core from valve body.

Once the ADV is disassembled, the following mainte

nance can be performed:

1. Inspect diaphragm; clean or replace as required.

2. Remove debris from the valve body.

3. Wipe solenoid core components with a clean cloth

or blow out debris with compressed air from and

OSHA-approved air nozzle that limits the dis

charge pressure to 30 psig.

4. Check that small port in diaphragm assembly is

clear and solenoid coil moves freely in housing.

Viton diaphragm seals are compatible with com-

monly used synthetic lubricants.

5. If timer is attached to valve body, check electrical

continuity across timer assembly.

To reassemble the ADV, reverse the sequence of the

preceding steps. After the ADV is reassembled, con-

nect the main power supply to the dryer. When the

HRD and HRD-EM Series (Bulletin 378) 1-17

Figure 9

AUTOMATIC DRAIN VALVE COMPONENTS

dryer is returned to service, check the ADV for air or

condensate leaks; tighten connections as required to

correct leaks. Check the drain cycle; adjust the timer

according to the procedure in the ADV Adjustment

section.

High-Humidity Alarm Field Adjustment

(HRD-EM only)

The high-humidity alarm is a feature on the HRD-EM

Series dryers.

To set the high-humidity alarm:

1. Turn power switch OFF.

DANGER

SHOCK HAZARD

Portions of the electrical control circuit remain

energized when the power switch is turned

OFF. Disconnect the main power supply to the

dryer before performing maintenance on the

electrical system.

2. Open the door of the electrical control box.

3. Locate the high-humidity alarm circuit board (ref-

er to Figure 10).

4. A calibrated set plug (refer to Figure 11) is

shipped loose inside the electrical box. The set

plug is used to select the setting at which the

high-humidity alarm sounds.

5. Remove the conduit connector (¾-inch) from the

outlet piping.

6. Unplug the white receptacle and insert the set

plug into the ribbon cable socket.

7. Unplug CON 8 from bottom right hand corner of

the control board.

8. Unplug CON 10 from right side of the control

board.

9. Connect a continuity tester to cable R (CON 10

PIN 1) and cable S (CON 8 PIN 2). The continu

ity tester is now connected across normally open

alarm contacts.

10. Turn the power switch to ON.

11. Set the alarm silencer switch to OFF. This switch

is on the door of the control box.

12. With a small slotted screwdriver, adjust P1 on the

high-humidity circuit board (Figure 10) clockwise

and counterclockwise. Find the adjustment point

where the contacts open and close. Leave adjust-

ment where the contacts just close.

NOTE: DO NOT ADJUST POTENTIOME-

TER P3.

13. Put a drop of lacquer on potentiometer P1 to pre-

vent vibrations from altering the setting.

14. Turn the power switch to OFF.

1-18 HRD and HRD-EM Series (Bulletin 378)

Figure 11

SET PLUG

Figure 10

HIGH-HUMIDITY ALARM CIRCUIT BOARD

POTENTIOMETERS P1 & P3

15. Remove the set plug and reinsert the white

receptacle.

16. Reinsert the conduit connector in outlet piping.

The high-humidity alarm is now set.

To put the dryer back into service, follow the start-up

instructions on page 1-9.

Care of Compu-Purge Sensors

Temperature Sensor

The temperature sensor located in the dryer inlet pip

ing. The sensor relays a DC millivolt signal to the mi

crocomputer in proportion to inlet air temperature. If

this sensor malfunctions, it must be replaced.

Pressure Sensor

Inlet and outlet pressure are sensed by a pressure trans

ducer in the center bottom of the electrical box. Two

cables connect the transducer to the control board, on

the inside of the door, at “CON 7" and ”CON 10."

Control air is supplied to the transducer from the No. 2

connector of the 3-way valve attached to the underside

of the electrical box.

If the pressure sensor malfunctions, replace the pres-

sure transducer and cables.

DANGER

EXPLOSION HAZARD

Dismantling or working on any component of

the compressed air system under pressure

may cause equipment damage and serious

injury. Before dismantling any part of the dryer

or compressed air system, completely vent the

internal air pressure to the atmosphere.

To remove the transducer and cables, remove the bulk

head fitting on the underside of the electrical box; dis

connect the control air line to the transducer;

disconnect the cables from the circuit board.

LCD Display Information

Low Inlet Air Pressure Alarm (Below 65 psig)

Display =

LOW INLET AIR PRESSURE

High Inlet Air Pressure

Display =

WARNING!! HIGH INLET AIR PRESSURE

Sensor Alarm for Pressure Transducer Failure (No

Signal)

Display =

LOW INLET AIR PRESSURE

Note: Dryer will enter Standby Mode.

Sensor Alarm for Pressure Transducer Failure

(High Signal)

Display =

PRESSURE SENSOR MALFUNCTION

High Inlet Temperature Alarm (Over 120°F)

Display =

HIGH INLET AIR TEMPERATURE

Sensor Alarm for Temperature (Open circuit)

Display =

750°F–TEMPERATURE SENSOR MALFUNCTION

Sensor Alarm for Temperature

(Transducer/control board malfunction)

Display =

390°F–TEMPERATURE SENSOR MALFUNCTION

Sensor Alarm for Temperature (Sensor shorted)

Display =

32°F–TEMPERATURE SENSOR MALFUNCTION

Switch Failure Alarm

Display =

WARNING!! FAILURE TO SWITCH TOWERS

High Humidity Alarm

Display =

WARNING!! HIGH HUMIDITY CONDITION

Standby Mode

Display = NO LOAD ON DRYER

IN STANDBY MODE: SAVING PURGE AIR

Coming out of Standby Mode

Display =

STANDBY MODE COMPLETE

USING STANDARD VALUES

Overload Indicator

Display =

DRYER IS OVERLOADED (MAX PURGE MODE)

More than one functional problem

Display =

MULTIPLE ERRORS: CHECK STATUS LIGHTS

Indicators and Alarms

Some malfunctions or component failures will cause

the dryer to enter a fixed-cycle mode using 15% of the

design airflow to regenerate the vessel. Other failures

may cause it to enter Standby Mode.

Low Inlet Air Pressure

The front panel indicator will light immediately when

the air line pressure drops below 65 psig. If the low

pressure condition is not corrected by the end of the

offstream tower’s regeneration cycle, the dryer will

enter Standby Mode. When the pressure increases to

above 65 psig, the dryer will automatically restart.

Pressure Transducer Malfunction

No Signal: The sensor malfunction indicator will not

light when a zero signal condition occurs. This condi

tion also indicates that there is no compressed air pres

sure. The low inlet air indicator will light and the dryer

will enter Standby Mode. This may happen if the con

nector (CON 7) on the control board is not securely

plugged in, if there is an open wire in the transducer

circuit, or if the transducer is faulty.

High Signal: The front panel sensor malfunction indi

cator will light immediately. Transducer output should

be checked using a DC millivolt meter. If the trans

HRD and HRD-EM Series (Bulletin 378) 1-19

ducer is faulty it must be replaced. The dryer will con

tinue to operate when this indicator is lighted.

PRESSURE TRANSDUCER OUTPUT

80 psig 20.020 MV

100 psig 25.050 MV

120 psig 30.030 MV

Temperature Sensor

The front panel sensor malfunction indicator will flash

if this sensor fails. The Compu-Purge will default to a

fixed 100°F inlet temperature signal and continue to

operate in the Variable Purge Mode. Output of the sen

sor can be checked on the control board at connector

CON 6. Using a DC voltmeter, attach the negative lead

to Pin 1, positive lead to Pin 2.

TEMPERATURE DC VOLTAGE OHMS

32°F 1.331 1854

104°F 1.482 2153

The LCD display will indicate the following error

codes:

32°F — TEMPERATURE SENSOR MALFUNCTION

Indicates a short circuit condition across the sen-

sor.

390°F — TEMPERATURE SENSOR MALFUNCTION

Indicates possible transducer or control board

malfunction or temperature is out of calibration

range of 33°F – 284°F.

750°F — TEMPERATURE SENSOR MALFUNCTION

Indicates sensor is unplugged (CON 6) or an open

circuit condition exists.

FIELD SERVICE GUIDE

WARNING

Compressed air can be dangerous unless

safety precautions are observed in the use of

compressed air and compressed air

equipment. Completely vent the internal air

pressure to the atmosphere before

disassembling any piping, fittings, valves or

other components and before doing any work

on compressed air equipment. To vent internal

air pressure, follow the shutdown instructions

on page 1-12.

1-20 HRD and HRD-EM Series (Bulletin 378)

HRD and HRD-EM Series (Bulletin 378) 1-21

Problem Possible Cause Remedy

Dew point too high

or too low

Inlet air flow higher than the sizing

condition.

Reduce inlet flow to sizing conditions.

Liquids entering the dryer inlet.

Check the inlet air line for liquids. Inspect prefilter and drain

valve. Clean, repair or replace drain valve.

Inlet air temperature higher than sizing

condition.

Check the compressor aftercooler and cooling system. Re

duce inlet air temperature to sizing condition.

Desiccant dusting.

Check air pressure, airflow and airflow surges, and correct

as necessary. Replace desiccant.

Desiccant coated with oil.

Check prefilter and drain valve. Replace prefilter element.

Clean, repair or replace drain valve as necessary. Consult

factory concerning need for desiccant replacement.

Mufflers plugged; excessive purge

back pressure.

Clean or replace muffler cores. If no air is discharging when

mufflers are removed, consult the factory.

Excessive pressure

drop in prefilter and

afterfilter.

Filter elements dirty. Replace elements.

Excessive pressure

drop in dryer.

Inlet and/or outlet screens on desic

cant towers dirty.

Clean or replace screens; follow desiccant removal instruc

tions in Maintenance section, then disconnect inlet and out

let piping to remove screens.

Excessive flow rate. Check flow rate of inlet air. Reduce to sizing condition.

Failure to switch.

No demand for outlet air.

Normal automatic shutdown; dryer operation and airflow

switching resume with demand for air.

Power failure.

1. Check power with voltmeter.

2. Check dryer fuse in the electrical enclosure. Replace as

necessary.

Solenoid valve stuck shut. Replace solenoid coil or complete valve.

Solenoid valve stuck open. Remove, dismantle and clean.

Shuttle valve stuck. Dismantle and clean. Replace if problem continues.

Mufflers plugged; no hiss from muf-

flers when purging.

Clean or replace cores.

Low air pressure to air-operated let

down valves.

Adjust purge air regulator to above 60 psig.

Microcomputer failure* Consult your local distributor

Dryer cuts off

automatically.

Power failure.

1. Check power with voltmeter.

2. Check dryer fuse in the electrical enclosure. Replace as

necessary.

Power is not connected to microcom

puter.*

With main power off, plug terminal strip into computer

board.

Microcomputer failure.* Consult your local distributor.

Loose or incorrectly installed ribbon

cable.*

Ensure that all ribbon cables are installed securely. If dryer

still will not start, contact your local distributor.

Automatic drain

valve continually

discharging/venting

Clogged diaphragm. Clean diaphragm.

Short in electrical component. Check and replace connector or timer assembly.

Automatic drain

valve not

discharging

No electrical power. Check and correct power supply and connections.

Timer malfunction. Replace timer assembly.

Solenoid coil malfunction. Replace solenoid coil.

Clogged ports. Clean ports.

No response when

push-to-test button

on automatic drain

valve is pressed

No electrical power. Check and correct power supply and connections.

Timer malfunction. Replace timer assembly.

* HRD-EM Series Dryers only.

1-22 HRD and HRD-EM Series (Bulletin 378)

Table 5

SPECIFICATIONS

MODEL

FLOW

CAPACITY

(scfm)

MAXIMUM

OPERATING

PRESSURE

(psig)

PREFILTER AFTERFILTER

MODEL NO. CCN MODEL NO. CCN

HRD56 / HRD56EM 55 150 IR56CHE 39240346 IR56PC 39240635

HRD100 / HRD100EM 100 150 IR100CHE 39240353 IR100PC 39240643

HRD160 / HRD160EM 160 150 IR175CHE 39240361 IR175PC 39240668

HRD200 / HRD200EM 200 150 IR250CHE 39240379 IR300PC 39240676

HRD275 / HRD275EM 275 150 IR450CHE 39240387 IR300PC 39240676

HRD350 / HRD350EM 350 150 IR450CHE 39240387 IR400PC 39240684

HRD475 / HRD475EM 475 150 IR450CHE 39240387 IR600PC 39240700

HRD600 / HRD600EM 600 150 IR600CHE 39240395 IR600PC 39240700

HRD800 / HRD800EM 800 150 IR1000CHE 39240411 IR800PC 39240718

HRD1000 / HRD1000EM 1,000 150 IR1000CHE 39240411 IR1000PC 39240726

HRD1200 / HRD1200EM 1,200 150 IR1200CHE 39240429 IR1200PC 39240734

HRD1450 / HRD1450EM 1,450 150 IR750CHE (2) 39240403 (2) IR800PC (2) 39240718 (2)

HRD1710 / HRD1710EM 1,710 150 IR1000CHE (2) 39240411 (2) IR1000PC (2) 39240726 (2)

HRD2010 / HRD2010EM 2,010 150 IR2000CHE 39252184 IR2000PC 39252317

HRD2250 / HRD2250EM 2,250 150 IR2400CHE 39252192 IR2400PC 39252325

HRD2600 / HRD2600EM 2,600 150 IR3000CHE 39252200 IR3000PC 39252333

HRD3250 / HRD3250EM 3,250 150 IR4000CHE 39252218 IR4000PC 39252341

Based on 100°F inlet air temperature and –40°F pressure dew point. Maximum recommended inlet temperature, 120°F. For capacity at inlet temperature higher than

100°F, consult your local distributor.

Material Safety Data Sheet

Date: March 1996

Emergency Phone

1-800-424-9300 (Chemtrec)

Only for use in the event of a chemical emergency

involving a spill, leak, fire, exposure or accident.

ACTIVATED

ALUMINAS

SECTION 1. CHEMICAL PRODUCT AND COMPANY IDENTIFICATION

Chemical: Aluminum Oxide Al

•xH

Product Name: Activated Aluminas

SECTION 2. COMPOSITION/INFORMATION ON INGREDIENTS

Component CAS Number Exposure Limits Typical % by Weight

Aluminum oxide 1333-84-2

ACGIH TLV 10 mg/m

OSHA PEL 15, 5 mg/m

respirable

90.0 – 97.0

Silicon dioxide* — — 0.01 – 0.2

* Expressed as oxide equivalent

SECTION 3. HAZARDS IDENTIFICATION

EMERGENCY OVERVIEW

No unusual fire or spill hazard. Dust may be irritating to eyes and upper respiratory tract. Off-white crys-

talline or gelatinous granules, pellets, or powder.

Potential Health Effects

Eyes: May cause irritation due to desiccant properties.

Skin: None.

Inhalation: May cause irritation of upper respiratory tract due to desiccant properties.

This product contains silicates at <1% by weight. Silicates include metal silicates, amorphous and crystalline sil

ica. No analytical method exists to detect and differentiate between amorphous and crystalline silica and other

silicates at <1% by weight. Based on the chemistry of bauxite-derived products, crystalline silica is not expected

to be present in this product.

Alumina is a low health risk by inhalation and should be treated as a nuisance dust as specified by the American

Conference of Governmental Industrial Hygienists (ACGIH).

SECTION 4. FIRST AID MEASURES

Eyes: Flush eyes with plenty of water for at least 15 minutes. If irritation persists, consult a physician.

Skin: Wash with soap and warm water. If irritation develops, consult a physician.

Inhalation: Remove victim to fresh air. If not breathing, give artificial respiration. Get immediate medical

attention.

SECTION 5. FIRE FIGHTING MEASURES

Flammable Properties: Non-flammable

HRD and HRD-EM Series (Bulletin 378) 1-23

Flash Point: None.

Flammable Limits: None.

Auto-Ignition Temperature: Not applicable.

Hazardous Combustion Products: None.

Extinguishing Media: Use extinguishing agent applicable to surrounding fire.

Firefighting Instructions: Firefighter should wear NIOSH approved, positive pressure, self-contained

breathing apparatus and full protective clothing when appropriate.

SECTION 6. ACCIDENTAL RELEASE MEASURES

Small/Large Spill: Clean up using dry procedures; avoid dusting.

SECTION 7. HANDLING AND STORAGE

Handling: Avoid contact with eyes. Do not inhale dust.

Storage: Keep material dry.

SECTION 8. EXPOSURE CONTROL/PERSONAL PROTECTION

Engineering Controls: Use with adequate ventilation to meet exposure limits listed in Section 2.

Respiratory Protection: NIOSH-approved dust respirator where exposure limit is or may be exceeded.

Skin Protection: None.

Eye Protection: Safety glasses recommended.

SECTION 9. PHYSICAL AND CHEMICAL PROPERTIES

Appearance: Off-white, crystalline or gelatinous granules, pellets, or powder.

Boiling Point: Not applicable.

Freeze-Melt Point: 3700°F (2038°C)

Vapor Pressure (mm): Not applicable.

Vapor Density (air = 1): Not applicable.

Solubility in Water: Insoluble; soluble in concentrated acids and alkalies.

Specific Gravity: 3.2

Density: Loose Bulk: 39 – 52 lb/ft

(0.62 – 0.83 g/cm

pH: ~10 (20% slurry solution)

Odor: None.

Odor Threshold (ppm): Not applicable.

Coefficient of Water/Oil Distribution: Not applicable.

SECTION 10. STABILITY AND REACTIVITY

Chemical Stability (conditions to avoid): Avoid water.

Incompatibility: None.

Hazardous Decomposition Products: None.

Hazardous Polymerization: None.

Generates heat with water.

Non-corrosive.

1-24 HRD and HRD-EM Series (Bulletin 378)

SECTION 11. TOXICOLOGICAL INFORMATION

No LD

or LC

found for oral, dermal or inhalation routes of administration.

SECTION 12. ECOLOGICAL INFORMATION

Ecotoxicological/Chemical Fate Information: Not available.

SECTION 13. DISPOSAL CONSIDERATION

Collect in containers, bags, or covered dumpster boxes. If reuse or recycling is not possible, material may be

disposed of at a sanitary landfill.

TCLP data are available.

RCRA Hazardous Waste No: Not federally regulated.

SECTION 14. TRANSPORT INFORMATION

Not regulated by U.S.A. DOT.

Canadian TDG Hazard Class & PIN – Not regulated.

SECTION 15. REGULATORY INFORMATION

For inventory purposes, CAS No. 1344-28-1 was assigned for aluminum hydroxide and activated alumina prod-

ucts instead of the CAS number indicated in Section 2.

This material does not contain nor was it manufactured using ozone-depleting chemicals.

U.S. FEDERAL REGULATIONS:

TSCA Status: On Toxic Substances Control Act Inventory.

CERCLA Reportable Quantity: None.

SARA Title III

Section 302 Extremely Hazardous Substances: None.

Section 311/312 Hazardous Categories: Immediate (Acute).

Section 313 Toxic Chemicals: None.

RCRA Status: Not regulated.

INTERNATIONAL REGULATIONS:

Canadian WHMIS: Listed on Domestic Substances List.

EINECS: All components of this product are on the European Inventory of Existing Commercial Chemical

Substances.

Information herein is given in good faith as authoritative and valid; however, no warranty, express or implied, can be

made.

HRD and HRD-EM Series (Bulletin 378) 1-25

Serie HRD y HRD-EM (Boletín 378) 2-1

SECADORES DE AIRE COMPRIMIDO

SERIE HRD

MANUEL DE INSTRUCCIONES

DEL OPERADORS

HRD56 – HRD3250

HRD56EM – HRD3250EM

Antes de instalar o arrancar el secador por

primera vez, estudie este manual

cuidadosamente para obtener un conocimiento

claro del secador y de las tareas a desempeñar

mientras opere y preste mantenimiento al

secador.

CONSERVE ESTE MANUAL CON LA UNIDAD.

Este manual técnico contiene INFORMACION

IMPORTANTE DE SEGURIDAD y debe

mantenerse con el secador todo el tiempo.

Boletín 378 (7/00)

2-2 Serie HRD y HRD-EM (Boletín 378)

Tabla de Contenidos

INTRODUCCION ....................................2-3

SEGURIDAD .......................................2-3

INSTALACIÓN......................................2-4

Recepción e Inspección ..................................2-4

Manipulación........................................2-4

Temperatura ambiente ...................................2-4

Localización y espacio libre ................................2-4

Preparativos del sistema ..................................2-4

Conexiones y tubería....................................2-4

Desecante..........................................2-5

Mofle (Silenciador) ....................................2-6

Conexiones eléctricas ...................................2-6

INSTRUMENTACION ..................................2-6

Modelos HRD56 hasta HRD3250 .............................2-6

Modelos HRD56EM hasta HRD3250EM .........................2-6

Luz de encendido (power ON light) ............................2-7

Indicadores de presión de torre ..............................2-7

Indicador de flujo de purga. ................................2-7

Alarma de fallo en cambio de válvula ...........................2-7

Indicador de humedad ...................................2-7

Alarma de alta humedad (HRD-EM solamente) ......................2-7

COMPU-PURGE

(HRD-EM solamente).........................2-7

COMO TRABAJA (SERIE HRD) ............................2-8

COMO TRABAJA (SERIE HRD-EM) .........................2-9

Control Compu-Purge ...................................2-9

VALVULAS DE DRENAJE AUTOMATICAS (ADV) ................2-10

ARRANQUE .......................................2-10

Punto de Rocío ......................................2-11

Ajustes de Purga .....................................2-12

Verificación de Punto de Rocío. .............................2-12

MANTENIMIENTO...................................2-12

Pulverización de Desecante................................2-12

Parada ...........................................2-13

Rutina De Mantenimiento ................................2-13

Diario ...........................................2-14

Semanal ..........................................2-14

Mensual ..........................................2-14

Anual ...........................................2-14

Retorno a la fábrica ....................................2-14

Reemplazo de Desecante .................................2-15

Para Reemplazar el Elemento Filtrante. .........................2-16

Mantenimiento de la Valvula de Drenaje Interna (Si está equipado con esta) ......2-18

Mantenimiento de la Valvula de Drenaje Automatica ..................2-18

Ajustes de Alarma de Alta Humedad (HRD-EM solamente) ..............2-19

Mantenimiento y Cuidado de los Sensores Compu-Purge ................2-20

Despliegue de Información en el LCD ..........................2-21

Indicadores y Alarmas ..................................2-21

GUIADESERVICIO..................................2-22

PARTES DE REPUESTO ................................A-1

DIAGRAMAS ELECTRICO ..............................A-1

INTRODUCCION

Los secadores de aire comprimido HRD y HRD-EM

(Administración de Energía) usan desecante remover

la humedad del aire comprimido, suministrando puntos

de rocío de –40°F. Ellos entregan el punto de rocío

requerido a la temperatura de aire de admisión, presión

y flujo especificados.

Cualquier cambio en la temperatura de admisión de

aire, presión o flujo puede afectar la presión del punto

de rocío. Vea la tabla 5 para la capacidad normal y

otras especificaciones del secador. El secador suple un

flujo continuo de aire seco entre dos torres desecantes,

una adsorbiendo humedad de el aire de entrada y la

otra reactivándose con aire seco de salida.

Para asegurar un buen desempeño continuo y una

operación segura de este secador, todos los

involucrados en su instalación, operación y el

mantenimiento deben leer cuidadosamente y seguir las

instrucciones en este manual. En todo el manual, la

palabra secador, es usada para referirse a la serie de

secadores HRD y HRD-EM.

SEGURIDAD

Los secadores de la Serie HRD y HRD-EM están

diseñados y construidos con seguridad como una

consideración principal; la industria ha aceptado los

factores de seguridad que se han usado en el diseño.

Cada secador es verificado en la fábrica para la

seguridad y la operación. Las torres han sido

examinadas hydrostaticamente a 1½ veces la presion

maxima de acuerdo con los requerimientos ASME.

Cada secador viene provisto con una válvula de alivio.

Todos los ajustes necesarios se hacen antes de

despacharlo.

ADVERTENCIA

Lea cuidadosamente las siguientes reglas de

seguridad antes de proceder con la

instalación, operación o mantenimiento. Las

reglas son esenciales para asegurar la

operación segura del secador. Falla en seguir

estas reglas puede invalidar la garantía o

resultar en daños al secador o lesiones

personales.

1. Nunca instale o trate de reparar cualquier secador

que se halla dañado durante el transporte. (Para

instrucciones vea Recepción e Inspección.)

2. No opere el secador a una presión más alta de las

que se especifican en la placa del secador. La

presión excedente puede resultar en daño severo o

la muerte.

3. Asegúrese de suministrar corriente eléctrica que

esté de acuerdo a las especificadas en la tablilla de

información de el secador.

4. No remueva las tapas ni afloje o remueva ningún

acople, conexión o cualquier otro dispositivo

mientras el secador esté en operación. El aire bajo

presión que están contenidos dentro del secador

puede ocasionar lesiones severas o la muerte. An

tes de hacer cualquier trabajo en el secador, este

seguro que el suministro eléctrico se ha

desconectado y la presión interna del secador haya

sido aliviada a la atmósfera.

5. Nunca trate de reparar el sistema eléctrico si la

corriente no halla sido desconectada. El alto

voltaje en la caja de control del motor es

peligroso. El secador debe instalarse de acuerdo a

los códigos eléctricos reconocidos. Antes de

trabajar en el sistema eléctrico, asegúrese de

desconectar el suministro de corriente del secador.

Partes de el circuito de control podran permanecer

bajo corriente luego de que el interruptor de

encendido/apagado se halle apagado.

6. Use únicamente partes de recambio genuinas del

fabricante del secador. El fabricante no se

responsabiliza por daños ocasionados por el uso

de partes no autorizadas.

Las instrucciones de seguridad en este manual están en

negrilla para enfatizar. Las palabras PELIGRO,

ADVERTENCIA y PRECAUCIÓN se usan para

indicar diferentes niveles de peligro de la siguiente

manera:

PELIGRO — Peligro Inmediato que resultará en daño

severo o muerte.

ADVERTENCIA — Peligro o practica insegura que

PUEDE resultar en un daño severo o muerte.

PRECAUCIÓN — Peligro o práctica insegura que

PUEDE resultar en un daño menor o en el producto o

en la propiedad.

La placa esta ubicada en la caja de control y provee

importantes datos del secador e información de

seguridad. Si por alguna razón la placa se deteriora o

se cae del secador, contacte su distribuidor local para

solicitar una de reemplazo.

Serie HRD y HRD-EM (Boletín 378) 2-3

INSTALACIÓN

Recepción e Inspección

Cuando reciba el secador, inspecciónelo

cuidadosamente. Cualquier indicio de mal manejo por

parte del transportador anotelo en el recibo de entrega,

especialmente si el secador no va a ser desempacado

inmediatamente. La obtención del visto bueno de la

persona que hace la entrega sobre cualquier daño

notado facilitará cualquier reclamo futuro a la

aseguradora.

Desde que el secador se despacha F.O.B. New Castle,

Delaware, la responsabilidad del fabricante cesa para

el embarque cuando el transportador firma el

conocimiento de embarque.

Si se reciben bienes faltantes o dañados, es importante

que notifique al transportador y que insista en la

anotación de la perdida o del daño sobre la cara del

conocimiento de embarque. De otra manera, no podrá

hacer ningún reclamo contra la compañía

transportadora.

Si se descubren perdida o daños ocultos, notifique

inmediatamente a su transportador y solicite una

inspección. Esto es absolutamente necesario. A menos

que lo haga, el transportador no atenderá ningún

reclamo de pérdida o daño. El agente hará una

inspección y concederá una anotación de daños

ocultos. Si usted le da a la compañía transportadora un

claro recibo de los bienes que se han perdido o dañado

en el transito, lo hace bajo su cuenta y riesgo.

El fabricante esta dispuesto a ayudarlo en todas las

maneras posibles para cobrar reclamos por perdida o

daño, pero esta disposición de nuestra parte no nos

hace responsables por el cobro de reclamos o el

reemplazo de materiales. Es responsabilidad suya el

presentar y procesar las reclamaciones.

Manipulación

El secador esta diseñado para moverse por medio de

ranuras para montacargas diseñadas en la base de

transporte o en los canaletes de la base. Manipule el

secador con cuidado y solo con equipos capaces de

levantar el peso.

Temperatura ambiente

Localice el secador bajo techo donde la temperatura

ambiente este entre 32°F y 100°F.

Localización y espacio libre

Ubique el secador sobre un cimiento sólido y nivelado.

El secador esta provisto con orificios de anclaje de

5/8" diametro minimo. Los secadores modelos 56

hasta 600 scfm, se deberan asegurar con (4) cuatro

pernos de ½" con un mínimo enrosque de 4". Los

secadores 800 scfm y mas grandes, se deberán

asegurar con cuatro pernos de ¾" con un mínimo

enrosque de 6". Se deben dejar por lo menos 24" de

espacio alrededor para poder darle mantenimiento a

todos los componentes. Asegúrese de que haya

suficiente espacio alrededor de los filtros para poder

cambiarlos. Instale barreras protectoras para reducir la

posibilidad de daños accidentales si el secador está

ubicado en una area abierta o si está cerca de tráfico

vehicular o pedestre.

Preparativos del sistema

Agua líquida y/o temperaturas de entrada de mas de

100°F en la admisión del aire afectará adversamente el

desempeño del secador. Instale el secador después del

pos enfriador o del separador para que la temperatura

de admisión del aire del secador este entre 60°F y

120°F y que no contenga agua liquida. Contacte a su

distribuidor local si es inevitable una operación

prolongada a temperaturas de entrada por encima de

100°F.

El aceite contamina el desecante, reduciendo su

eficiencia y su vida util. El secador viene provisto de

un prefiltro removedor de aceite a la entrada para

protejer el desecante y de un posfiltro removedor de

partículas y mugre a la salida.

Conexiones y tubería

Las conexiones a la entrada y salida del secador son

suministradas por el cliente a no ser de que se haya

especificado de otra manera. Vea la Tabla 1 para

tamaños de conexiones. Se recomienda el uso de

valvulas de bloqueo manuales a la entrada y a la salida

y una válvula de venteo manual para que el secador se

pueda aislar y despresurizar y asi poderle dar

mantenimiento. Vea la Figura 1 para el arreglo de

cañería recomendado. Las conexiones y las uniones

deben tener la capacidad para la presión máxima de

operación dada en la placa del secador y deben estar

según los códigos de aplicación.

Tabla 1

CONEXIONES

Modelo

Conexiones

(pulgadas)

Entrada Salida

HRD56 / HRD56EM ¾ NPT ½ NPT

HRD100 / HRD100EM 1 NPT ¾ NPT

HRD160 / HRD160EM 1¼ NPT 1 NPT

HRD200 / HRD200EM 1½ NPT 1¼ NPT

HRD275 / HRD275EM 2 NPT 1¼ NPT

HRD350 / HRD350EM 2 NPT 1¼ NPT

2-4 Serie HRD y HRD-EM (Boletín 378)

Modelo

Conexiones

(pulgadas)

Entrada Salida

HRD475 / HRD475EM 2 NPT 1½ NPT

HRD600 / HRD600EM 2½ NPT 2 NPT

HRD800 / HRD800EM 3 NPT 2½ NPT

HRD1000 / HRD1000EM 3 NPT 2½ NPT

HRD1200 / HRD1200EM 3 NPT 3 NPT

HRD1450 / HRD1450EM 3 FLG 3 NPT

HRD1710 / HRD1710EM 4 FLG 3 NPT

HRD2010 / HRD2010EM 4 FLG 4 FLG

HRD2250 / HRD2250EM 4 FLG 4 FLG

HRD2600 / HRD2600EM 4 FLG 4 FLG

HRD3250 / HRD3250EM 6 FLG 4 FLG

Soporte toda la tubería; no permita que esta ponga

ninguna tensión en las conexiones del secador. La

tubería deberá ser por lo menos del tamaño de las

conexiones de entrada y salida para minimizar la caída

de presión en el sistema de aire. Tuberias de menor

tamaño reducirán el rendimiento de el secador.

Si la cañería de salida de purga debiese ser extendida

afuera de el area de el secador, se debe usar un tamaño

de cañería que impida caidas de presión de mas de

0.25 psid.

CAIDAS DE PRESION REDUCIRAN EL

RENDIMIENTO DE EL SECADOR. Para mas

detalles en referencia a cañerías , consulte con su

distribuidor local.

Se puede instalar una válvula de desvío para permitir

el flujo de aire durante el mantenimiento. Si la

aplicación no tolera aire sin procesar por periodos

cortos, instale otro secador en la linea de desvío.

PRECAUCION: Nunca examine las tuberías

hydrostaticamente con el secador conectado a el

sistema si este se encuentra lleno de desecante, esto

dañaria el desecante.

Desecante

Los secadores usan alúmina activada como desecante.

Los modelos 56 hasta 600 scfm son enviados con

alúmina activada en las torres. La alúmina activada es

enviada por separado con todos los otros modelos

normales.

Todo el desecante deberán ser agregados a el secador

antes de ponerse en servicio.

Refiérase a la Tabla 2 para sus respectivas cantidades

por torre.

Tabla 2

REQUERIMIENTOS DE DESECANTE

Modelo No

Alúmina Activada

(lbs por torre)

HRD56 / HRD56EM 31

HRD100 / HRD100EM 60

HRD160 / HRD160EM 95

HRD200 / HRD200EM 120

HRD275 / HRD275EM 165

HRD350 / HRD350EM 210

HRD475 / HRD475EM 285

HRD600 / HRD600EM 366

HRD800 / HRD800EM 475

HRD1000 / HRD1000EM 600

HRD1200 / HRD1200EM 725

HRD1450 / HRD1450EM 880

HRD1710 / HRD1710EM 1,025

HRD2010 / HRD2010EM 1,200

HRD2250 / HRD2250EM 1,366

HRD2600 / HRD2600EM 1,567

HRD3250 / HRD3250EM 1,975

Para agregar desecante:

ADVERTENCIA

El siguiente procedimiento provee

instrucciones para el llenado inicial de las

torres si el desecante se va a reemplazar,

refiérase a las instrucciones en la página 2-15.

1. Asegúrese de que los indicadores de presión de

torre muestren 0 psig. Si no, despresurize las

Serie HRD y HRD-EM (Boletín 378) 2-5

Figura 1

ARREGLO DE TUBERIA RECOMENDADO

torres de acuerdo con las instrucciones de apagado

en la página 2-13.

2. Remueva el tapón de el orificio de entrada de

desecante. Refiérase a la placa de el secador para

el diagrama que muestre la localización de el

orificio de entrada de desecante. Limpie e

inspeccione el orificio de entrada.

PRECAUCION

La carga de el desecante produce un polvo

fino; el personal instalando el desecante

deberá usar anteojos de seguridad y

mascarillas contra polvo. Refiérase al (MSDS)

en la página 2-25 para información mas

completa sobre el desecante.

Nunca apisone, force, o introduzca el

desecante de manera neumática en las torres.

El apisonar daña el desecante y causa mucho

polvo.

3. Llene cada torre con desecante hasta que la

cantidad específica de desecante se encuentre

instalada.

4. Para asegurar la distribución uniforme del

desecante, y para generar mas espacio adentro de

las torres, dele golpes suaves en los lados de la

torre con un martillo de caucho. NO APISONE O

ESFUERZE EL DESECANTE.

5. Reinstale los tapones de los orificios y drenaje de

desecante poniendoles cinta de teflon.

Mofle (Silenciador)

Cada secador esta provisto con dos mofles de salida de

purga. Si este no viene instalado, asegúrese de que

estén enroscados en la conexión de salida de purga en

la cañeria inferior. La pulverización de el desecante

puede causar restricciones en los mofles despues de el

arranque. Dependiendo de el modelo de el secador, los

elementos de los mofle se pueden encontrar en la caja

de control o amarrados a uno de los soportes de el

secador. Para información adicional véa las notas

sobre la Pulverización de Desecante en la sección de

mantenimiento, página 2-12.

ADVERTENCIA

Operar el secador sin el mofle, puede causar

niveles de ruidos excesivos excediendo los

margenes de la OSHA. Remueva los mofles

solo para servicio y mantenimiento, y solo

cuando la presión interna de el secador se

halla venteado a la atmósfera.

Conexiones eléctricas

Los secadores vienen listos para usarse. Suministre la

corriente indicada en la placa de el secador. las

conexiones marcadas L1 y L2, se encuentran en el ter

minal de cables adentro de la caja de control. Haga las

conexiones por el orificio taponado (identificado por

un marbete) en la parte inferior derecha de la caja.

PELIGRO

Conecte el secador a tierra usando la

conexión suministrada adentro de la caja de

control. Para detalles de conexiones, refiérase

a el diagrama eléctrico en la parte trasera del

manual.

Nota Importante: Nunca prenda o apague el secador

por medio de un interruptor remoto. Para evitar daños

a el secador, encienda y apague el secador usando el

interruptor en la caja de control.

INSTRUMENTACION

La instrumentación siguiente ayuda a verificar el

funcionamiento y el rendimiento del secador. Los

instrumentos que están disponibles en o el HRD o

HRD EM (Administración de Energía) son tan notado.

Modelos HRD56 hasta HRD3250

Los secadores Serie HRD tienen calificación NEMA

1, e incluyen lo siguiente:

• Luz de Energía ENCENDIDA.

•

Medidores de presión de los recipientes.

•

Indicador de flujo de purga.

•

Alarma de Avería del Interruptor

•

Indicador de Humedad

Modelos HRD56EM hasta HRD3250EM

Los secadores Serie HRD-EM tienen calificación

NEMA 4, e incluyen lo siguiente:

•

Luz de Energía ENCENDIDA

•

Medidores de presión de los recipientes

•

Indicador de flujo de purga

•

Alarma de Avería del Interruptor

•

Indicador de Alta Humedad

•

Compu-Purge

•

Pantalla Digital

•

Indicador de Humedad

2-6 Serie HRD y HRD-EM (Boletín 378)

•

Alarma audible con contactos auxiliares

Luz de encendido (power ON light)

Indica cuando el secador este encendido.

Indicadores de presión de torre

Nos indican cual torre está secando y cual torre está en

regeneración. El indicador de la torre en linea nos in

dica la presión de operación. El indicador de la torre

fuera de linea o en regeneración debe indicar 0 psig.

Indicador de flujo de purga.

El indicador de presión montado en el soporte de

indicadores representa la presión de aire como una

medida aproximada de aire de flujo cuando se usa en

conjunto con la gráfica de calibraciíón provista con el

secador.

Para aproximar el flujo de purga, Localice la presión

(psig) en el eje horizontal de la gráfica. Siga esta

presión hacia arriba hasta que haga intersección con la

curva de calibración. Siga este punto hacia la izquierda

hasta que intersecte con el eje vertical. Este punto en el

eje vertical es aproximadamente el flujo de purga.

Alarma de fallo en cambio de válvula

Los sensores de presión localizados en cada torre

disparan alarmas audibles y visibles si la torre no se

despresuriza despues de completar el ciclo de secado.

La luz roja denominada SWITCH FAILURE se

encuentra en el panel de control. El secador esta

provisto de un relevador de acción retardada. Este

relevador,deberá estar montado en el panel eléctrico

antes de el arranque. El diagrama eléctrico en la parte

trasera de este manual contiene dichos detalles.

Indicador de humedad

El indicador de humedad es enviado en una bolsa a

prueba de humedad adentro de la caja de control. El

indicador es verde cuando está seco. El color cambia a

amarillo cuando la humedad relativa de el secador este

entre 4% y 5%. Este indicador es un metodo

economico para determinar si el secador esta

trabajando normalmente.

Alarma de alta humedad (HRD-EM

solamente)

Un sensor de humedad en la cañería de salida percibe

la humedad relativa de el aire de salida. El sensor

dispara alarmas audible y visibles si la humedad

relativa a la salida excede el punto establecido en la

fábrica. La alarma audible esta localizada cerca de la

caja de control. La luz roja denominada HIGH HU

MIDITY, (Alta humedad), esta localizada en el panel

eléctrico. Para calibrar la alarma de alta humedad, el

secador viene provisto con un relevo de ajuste

establecido. Refiérase a el diagrama eléctrico en la

parte trasera para los numeros de los terminales en los

cuales conectar anunciadores remotos. Refiérase a la

sección de mantenimiento para instrucciones sobre

ajustes.

COMPU-PURGE

(HRD-EM solamente)

Indicadores

Todos los secadores de serie HRD-EM con

Compu-Purge

están provistos de paneles indicadores

(Figura 2) en la puerta de la caja eléctrica principal.

Estos indicadores ayudan a verificar la operación y el

rendimiento de el secador. Si el secador comienza a

funcionar mal, refiérase a este panel como primera

medida para determinar la causa del problema.

Luz Función

Power ON

(Encendido)

Se prende cuando el interruptor se

encuentre en la posición de “ON”

(Encendido) y el secador le este

llegando corriente.

Variable Purge

Mode

(Método de Purga

Variable)

Se prende cuando el ciclo de el

secador esta siendo controlado por un

microprocesador.

Serie HRD y HRD-EM (Boletín 378) 2-7

Figura 2

PANEL INDICADOR COMPU-PURGE

Luz Función

High Inlet Air

Temperature (Alta

Temperatura de

Entrada)

Se prende cuando la temperatura de

entrada excede 120°F. Temperaturas

altas de entrada disminuyen la

capacidad de secar y puede resultar

en puntos de rocío altos.

Dryer Overload

(Sobrecarga del

Secador)

Se prende cuando el flujo de entrada

excede la capacidad de el secador de

mantener punto de rocío.

Low Inlet Air

Pressure

(Baja Presion de

Entrada)

Se prende cuando la presión del aire

de entrada es menos que 65 psig. Vea

la sección de mantenimiento para

informacion adicional.

Sensor

Malfunction

(Sensor Averiado)

Se prende cuando el sensor de

temperatura o el de presión le manda

señales a el microcomputador fuera de

el alcance normal de el sensor.

High Humidity

(Alta Humedad)

(HRD-EM

solamente)

Se prende cuando el monitor de alta

temperatura detecte humedad

excesiva en el aire de salida. La alta

humedad puede ser causada por una

repentina inundacion con agua.

Failure-to-Switch

(Fallo de

Intercambio)

Se prende si el flujo de aire cesa de

alternar su proceso entre las dos

torres en el tiempo designado de

intercambio. Este fallo resultará en

puntos de rocío altos.

Pantalla LCD

La pantalla LCD esta localizada arriba de el panel

indicador en la caja eléctrica principal. Despliega “IN-

LET AIR TEMPERATURE” (TEMPERATURA DE

AIRE DE ENTRADA) (°F) y “ENERGY SAVINGS”

(AHORROS DE ENERGIA) Como un porcentaje de

la capacidad de el secador.

Vea la sección de mantenimiento, página 2-12 para

una descripción completa de los desplieges

adicionales.

Alarma Audible

Indica la alta humedad y el estado de alarma de avería

para conmutar.

Contactos remotos

El secador viene provisto con contactos de 120 voltios,

normalmente abiertos y de 1 amp. max. para permitir

conexiones de alarmas remotas audibles o visibles.

Los contactos están identificadoss con marbetes en la

parte inferior de la caja eléctrica.

COMO TRABAJA (SERIE HRD)

La serie de secadores automaticos HRD suplen un

flujo continuo de aire seco comprimido entre dos

torres desecantes, una adsorbiendo humedad de el aire

de entrada y la otra reactivándose con aire seco de

salida . El ciclo se controla con un cronometrador de

leva. La figura 2 nos muestra el flujo de el aire por el

secador con la torre A en linea y la torre B en

regeneración.

El aire saturado entra por el prefiltro, el cual separa el

vapor de aceite, aceite liquido, agua y partículas de el

flujo de entrada. La contaminación es desechada por

medio de la trampa de desague. Con la válvula de

purga E cerrada, el aire filtrado entra en la parte infe

rior de la torre A por la válvula de vaivén S; el

desecante en la torre remueve la humedad. El aire seco

sale por la parte superior de la torre y es dividido en

dos fuentes: el aire de proceso sale por la válvula de

vaivén T, pasa por el posfiltro particular y continúa

hacia el proceso.

Una porción medida de el aire seco (aire de purga)

pasa por el orificioCyseventea a presión atmosférica

por el orificio D expandiendo su volumen en gran

cantidad. Este aire a presión atmosférica fluye hacia

abajo en la torre B, pasa or la válvula de purga F, y

sale por el mofle llevandose consigo la humedad

adsorbida por el desecante en el ciclo anterior.

El secador opera así por aproximadamente 4 minutos.

Luego la válvula F se cierra y permite que la torre B se

2-8 Serie HRD y HRD-EM (Boletín 378)

Figura 3

DIAGRAMA DE FLUJO (Serie HRD)

presurice gradualmente por un minuto antes de que el

ciclo cambie. Dependiendo en la presión de operación,

la sequencia de el ciclo cronometrado puede variar. En

el intercambio, la válvula de purga E se abre para

despresurizar la torre A. Esta situacion causa que la

válvula de vaivénSyTcambien de posición poniendo

la torre B en linea y la torre A en regeneración.

COMO TRABAJA (SERIE HRD-EM)

La figura 2 nos muestra el flujo de el aire por el

secador con la torre A en linea y la torre B en

regeneración.

El aire saturado entra por el prefiltro, el cual separa el

vapor de aceite, aceite liquido, agua y partículas de el

flujo de entrada. La contaminación es desechada por

medio de la trampa de desague, o válvula de drenaje.

Con la válvula de exhosto C abierta y D cerrada, el

aire filtrado entra en la parte inferior de la torre A por

la válvula de vaivén S; el desecante en la torre

remueve la humedad. El aire seco sale por la parte su-

perior de la torre y es dividido en dos fuentes: el aire

de proceso sale por la válvula de vaivén de salida ,

pasa por el posfiltro particular y continúa hacia el

proceso.

Una porción medida de el aire seco (aire de purga)

pasa por el orificio de purga casi a presión

atmosférica. Este aire a presión atmosférica fluye

hacia abajo en la torre B, pasa por la válvula de purga

F, y sale por el mofle llevandose consigo la humedad

adsorbida por el desecante en el ciclo anterior. El aire

de purga humedo sale sale a la atmósfera por la

válvula de exhosto C y por el mofle E. Cuando la

regeneración se completa, la válvula de exhosto C se

cierra y la torre B se represuriza a presión de

operación. La torre B se encuentra regenerada y

represurizada, lista para el ciclo de secado siguiente.

Al final de periodo de secado, la válvula de exhosto D

se abre, la torre A se despresuriza. Las válvulas de

vaivén de entrada y salida cambian de posición, el

flujo de entrada cambia a la torreByelciclo de

secado/regeneración se repite.

El aire fluye por la mitad de el ciclo normal de 10

minutos.

Control Compu-Purge

Por medio de un microcomputador, el control

Compu-Purge ajusta el caudal de el flujo de purga y lo

relaciona automaticamente con el contenido de

humedad en el aire de entrada.

Los sensores electrónicos de presión y temperatura

verifican la temperatura de entrada y las presiones de

entrada y de salida y le trasmite esta información a el

microcomputador. El microcomputador calcula el

contenido de humedad del secador y calcula la

combinación mas eficiente de caudal de flujo de purga

y duración de este para eliminar la humedad adsorbida

durante el periodo de secado.

El caudal de flujo de purga puede variar de 0 a 20% en

incrementos de 5% por medio de las válvulas de con

trol de purga 1 y 2. La duracion de la purga también

puede variar. El microcomputador selecciona

automaticamente la combinación óptima de apertura

de válvulas de control de purga para proveer el aire

justamente necesario para la regeneración completa de

la torre .

Cuando la cantidad de aire de purga necesario para

regenerar el desecante es mayor que el 20% de el cau

dal de entrada, el secador automaticamente acortará el

tiempo de el ciclo hasta que la condición de sobrecarga

Serie HRD y HRD-EM (Boletín 378) 2-9

Figura 4

DIAGRAMA DE FLUJO (Serie HRD-EM)

sea corregida. Los modelos trabajarán con un ciclo de

5 minutos cuando se presente una condición de

sobrecarga.

El microcomputador usa tres metodos de operación

para comparar la carga de humedad de entrada:

•

Metodo Compu-Purge – Cuando el

microcomputador ajusta el aire de purga para

equiparar la carga de humedad, el secador está

operando en el bajo el método Compu-Purge.

•

Metodo de Standby o Espera – Cuando el

requerimiento de aire de purga es muy bajo, o

cuando no hay necesidad de este, el secador

operará bajo el método de Standby: el secador

purga hasta que el desecante esté regenerado,

las torres se presurizán, luego el secador se

apaga automaticamente; el secador purga cada

30 minutos para asegurar el punto de rocío

especificado.

•

Metodo de Ciclo Fijo – Si todos los sensores se

dañan, la luz “Variable Purge Mode” (Método

de Purga Variable) se apagará y el secador

empezará a operar en un ciclo fijo

automaticamente, usando el 15% de el flujo

preseleccionado para regenerar la torre fuera de

linea. Si solo un sensor se daña, el secador

funcionará bajo las condiciones normales de

dicho sensor y continuará operando bajo el

Método de Purga variable. Vea la sección de

mantenimiento, página 2-12, para información

adicional.

VALVULAS DE DRENAJE

AUTOMATICAS (ADV)

Para eliminar el aceite y el agua periodicamente de la

carcaza de el prefiltro, los secadores de la secadora

vienen provistos con una válvula electrónica que

descarga automaticamente la condensación en el

prefiltro.

La válvula ADV tiene dos luces indicadoras LED y

una tecla de verificación de operación. La válvula se

abre al oprimir esta tecla. Una de las luces indica que

le está llegando corriente, y la otra indica que la

válvula está abierta. El LED indicador de corriente se

apaga cuando la válvula se abre. Si uno o ambos de los

LED no se prende en el momento indicado, refiérase a

la sección de mantenimiento en este manual. Si el

secador se encuentra bajo garantía, llame a su

distribuidor local antes de tratar de arreglarlo.

La operación de la válvula ADV es controlada por un

cronometrador electrónico. La apertura de la válvula

se puede regular de 0.5 a 10 segundos. El ciclo de

drenaje se puede regular de 0.5 a 45 minutos.

Para minimizar las perdidas de aire comprimido, el

cronometrador se debe ajustar para que abra la válvula

y descargue el condensado solamente. El

cronometrador esta regulado propiamente si solo sale

liquido en un periodo de apertura. Si sale aire por mas

de un segundo, regule el cronometrador y establezca

un ciclo mas largo

ARRANQUE

Una vez que su secador de serie HRD/HRD-EM halla

sido instalado de acuerdo con las instrucciones, estará

listo para el arranque.

Para arrancar el secador:

1. Cierre las válvula de bloqueo (provista por el

usuario) de entrada.

2. Abra la válvula de desvío (provista por el

usuario), si esta se encuentra instalada.

3. Cierre la válvula manual de despresurización

(provista por el usuario), y la válvula de bloqueo

de salida.

4. Suminístrele aire comprimido a la válvula de

bloqueo de entrada.

5. Lentamente abra la válvula de bloqueo de entrada

y deje que el secador se presurize a presión nor-

mal de operación. Los indicadores de presion en

ambas torres indicaran presión de operación.

6. Verifique que no hayan escapes en las conexiones

de tuberia. arregle cualquier escape antes de

continuar el arranque.

7. Para secadores Serie HRD:

•

Usando el interruptor en la caja de control

prenda el secador. Dependiendo de la posición

de la válvula de vaivén, y de la presión de

operación, una de las torres se despresurizará, o

ambas torres permanecerán presurizadas hasta

por 90 segundos, luego una se depresurizará.

•

Opere el secador por tres ciclos para verificar

una operación satisfactoria. El ciclo de el

secador es de 10 minutos, cada torre estará en

linea por cinco minutos.

8. Para secadores Serie HRD-EM:

•

Prenda el secador con el interruptor en la caja

eléctrica.

•

Cuando el interruptor este en la posición de

“power on” o encendido, la luz se encenderá.

2-10 Serie HRD y HRD-EM (Boletín 378)

Ambas torres permanecerán presurizadas hasta

por 60 segundos, luego una se despresurizará y

la luz verde “Variable Purge”, o purga variable

se encenderá.

•

Los modelos con pantalla LCD indicarán lo

siguiente en sequencia.

DELTECH ENGINEERING, L.P., COPYRIGHT

1988...1991

INLET TEMP. 99° ENERGY SAVINGS = 80%

NO MALFUNCTIONS EXIST

FIRST CYCLE OF OPERATION

USING DEFAULT VALUES

Durante los próximos cinco minutos, el

microcomputador se autoverificará para

asegurarse de que esté funcionando

correctamente. Durante el arranque, el secador

operará bajo el método de ciclo fijo usando el

15% de purga.

Al final de este período, la operación de el

secador será controlada por el computador, la

luz “Variable Purge Mode” se encenderá y el

microcomputador ajustará la purga

automaticamente. Los modelos con pantalla

LCD indicarán lo siguiente:

INLET TEMP XX ENERGY SAVINGS = XX%

NO MALFUNCTION EXISTS

Cuando el requerimiento de aire de purga es

muy bajo, o cuando no hay necesidad de este,

el secador operará bajo el metodo de Standby.

(Vea la sección de Control Compu-Purge.)

Los modelos con pantalla LCD indicarén lo

NO LOAD ON DRYER

(Secador sin flujo, o sin carga de humedad)

IN STANDBY MODE: SAVING PURGE AIR

(En el metodo stanby: Ahorrando aire de purga)

•

Si el secador tiene una alarma audible, apáguela

por medio de el interruptor silenciador de

alarmas, pongalo en “ON.”

9. Lentamente abra la válvula de bloqueo de salida.

10. Cierre la válvula de desvío.

Punto de Rocío

El punto de rocío de el aire de salida se controla por

medio de la cantidad de aire de purga usado en la

Serie HRD y HRD-EM (Boletín 378) 2-11

Tabla 3

FLUJO DE AIRE DE ENTRADA A VARIAS PRESIONES

Modelo

Presión de Entrada (psig)

30 40 50 60 70 80 90 100 110 125 150

Caudal de Entrada Averaje (scfm)