5
MAINTENANCE
The dryers require little maintenance for satisfactory opera
-
tion. 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 war
-
ranty 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 and perform the following:
1. 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 discharge condensate through a full-port drain
opening. The valve body may need to be cleaned under condi-
tions 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 connected 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 of
solenoid 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 cor
-
rect 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 num
-
ber and ship freight prepaid as directed by your local distributor.
