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5

MAINTENANCE

The dryers require little maintenance for satisfactory
operation. Good dryer performance can be expected if the
following routine maintenance steps are taken.

Disconnect power supply and depressurize

dryer before performing any maintenance.

General

For continued good performance of your refrigerated dryer,
all refrigeration system maintenance should be performed
by a competent refrigeration mechanic.

NOTE: Before corrective maintenance is done during the
warranty period, call your local distributor and proceed
according to instructions. Refer to the warranty for limits of
your coverage.

Daily Maintenance

Check the separator for condensate discharge. If no
discharge is evident, depressurize, dismantle and perform
the following:
1.

Automatic Float Drain - Clean separator housing with
mild soap and water. Discard drain and replace.

2.

Electric Drain - Clean strainer and/or clean/replace
solenoid valve.

Monthly Maintenance

Inspect the condenser coils. Remove accumulated dust and
dirt with a soft brush or with air from an OSHA approved
compressed air nozzle that limits the discharge pressure to
30 psig.

Electronic Drain Valve Disassembly and Servicing

Do not disassemble drain valve timer or

attempt to repair electrical parts. Replace timer if defective. 

The drain valve discharges condensate through a 
full-port drain opening. The valve body may need to be
cleaned under conditions of gross particulate contamination.

To disassemble the drain valve body for cleaning and other
maintenance:
1.

Turn power switch off.

2.

Disconnect main power supply to dryer.

3.

Depressurize unit

4.

Lock out and tag power supply in accordance 
with OSHA requirements.

If power supply is not disconnected and unit

is not depressurized before disassembly, serious personal
injury and valve damage may result.  

5.  Remove screw and washer from front of the drain valve.
6.  Remove the power supply connector and gasket (with

the timer assembly if attached) from the solenoid coil
housing. Do not damage or lose the gasket.

7.  Remove coil fixing nut and spring washer from top

ofsolenoid coil housing.

8.  Lift solenoid coil housing off solenoid core in valve body.
9.  Unscrew solenoid core from valve body.

Once the drain valve is disassembled, the following
maintenance can be performed.
1.

Inspect internal parts of valve body; clean or replace as
required.

NOTE: Replace solenoid valve if component damage is observed
2.

Remove debris from valve body.

3.

Wipe solenoid core components with a clean cloth or
blow out debris with compressed air from an OSHA-
approved air nozzle that limits its discharge pressure to
30 psig.

4.

Check that the plunger assembly is clean and moves
freely in housing.

5.

If timer is attached to valve body, check electrical
continuity across timer assembly. 

To reassemble the drain valve, reverse the sequence of the
preceding steps. After the drain valve is reassembled,
connect the main power supply to the dryer. When the
dryer is returned to service, check the drain valve 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 drain valve adjustment section.  

Returns to Manufacturer

If the dryer or a component of the dryer must be returned
to the manufacturer, first call your local distributor for a
return authorization number and shipping address. Your
distributor will inform you whether the dryer or only a
component must be returned. Mark the package with the
return authorization number and ship freight prepaid as
directed by your local distributor.

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Parts List

Item

5-10

15

On/Off Switch

3041494

3041494

Float Drain Kit

3090900

N/A

Timer Drain

N/A

3149293

Summary of Contents for HPR Series

Page 1: ...ING 2 STORAGE 2 INSTALLATION 3 INSTRUMENTATION 4 CONDENSATE DRAIN VALVE 4 START UP OPERATION 4 SHUTDOWN 4 MAINTENANCE PARTS LIST 5 FIELD SERVICE GUIDE 6 SPECIFICATIONS 7 ELECTRICAL SCHEMATIC 7 FLOW SC...

Page 2: ...ns for the requirements for breathing quality air RECEIVING MOVING AND UNPACKING A RECEIVING This shipment has been thoroughly checked packed and inspected before leaving our plant It was received in...

Page 3: ...the replaceable filter element Outlet air temperature may be 10 to 30 degrees higher than inlet air temperature This is normal Consult your distributor if a lower outlet air temperature is required Pi...

Page 4: ...d The dryers are fully automatic and require no auxiliary controls 1 Connect inlet and outlet lines to the dryer Reference dryer indentations and instruction tag for appropriate inlet and outlet conne...

Page 5: ...assembly serious personal injury and valve damage may result 5 Remove screw and washer from front of the drain valve 6 Remove the power supply connector and gasket with the timer assembly if attached...

Page 6: ...Refrigerant compressor stopped HIGH PRESSURE DROP SYMPTOM Low outlet pressure POSSIBLE CAUSE Failure of drain trap Aftercooler malfunction Leak in refrigerant system Compressor overheated Compressor...

Page 7: ...ITIONS Min Max Inlet Air Pressure compressed air at inlet to dryer 30 250 psig 30 250 psig Min Max Inlet Air Temperature compressed air at inlet to dryer 40 F 122 F 40 F 122 F Min Max Ambient Temperat...

Page 8: ...d by the manufacturer Unauthorized service voids the warranty and any resulting charge or subsequent claim will not be paid Products repaired or replaced under warranty shall be warranted for the unex...

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