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3. Lock out and tag the power supply in accordance
with OSHA requirements.
DANGER
Portions of the control circuit remain
energized when the power switch is in the OFF
position. Disconnect supply power to the dryer
before performing maintenance on the
electrical system.
If mechanical repairs must be made, vent the internal
pressure of the dryer to atmospheric pressure.
Restart the dryer according to the start-up instructions.
MAINTENANCE
DXR Series dryers require little maintenance for satis-
factory operation. Good performance can be expected if
the following routine maintenance steps are taken.
DANGER
Dismantling or working on any component of
the compressed air system under pressure
may cause equipment failure and serious
personal injury. Before dismantling any part of
th e dry er o r co mpressed air s ys tem,
completely vent the internal pressure to the
atmosphere.
General
For continued good performance of your refrigerated
dryer, all refrigeration system maintenance should be
performed by a competent refrigeration mechanic. Bef-
ore 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 operation of the automatic drain valve at least
once during each 8-hour shift. See the Field Service
Guide for remedies to drain valve malfunctions. See the
Instrumentation section for drain valve adjustment.
Check the following readouts on the system operation
monitor.
• high evaporator temperature
• refrigerant suction temperature
• refrigerant discharge temperature
• alarm lights
DXR Series Dryers (Bulletin 553)
Refer to the Instrumentation section and the Field Serv-
ice Guide for further information.
Weekly Maintenance
Check prefilter (if installed) differential pressure gauge.
Replace filter element when pointer reaches red zone of
gauge (approx. 7 to 10 psid). Failure to change element
at least once a year or when the gauge reaches the red
zone will adversely affect dryer performance. See Filter
Element Replacement procedure.
Monthly Maintenance
For air-cooled condensers, inspect the condenser coils.
Remove dust, dirt or other particles with a soft brush or
with compressed air from an OSHA-approved air nozzle
that limits its discharge pressure to 30 psig. If the coils
are coated with oil, grease or other substances that re-
duce the cooling efficiency, clean the coil.
Replace the ambient air filter. See Ambient Air Filter
Replacement procedure.
Service Due Indicator
On dryers equipped with the System Operation Monitor,
the yellow SERVICE DUE indicator will light after
4,500 hours (six months) of dryer operation. At this
time, complete the following:
• Disassemble and clean automatic drain valve.
• Disassemble and clean separator bowl.
• For air-cooled condensers, inspect the condenser
coils; clean if necessary. Lubricate fan motors
with 20 wt motor oil (if necessary).
• For water-cooled condensers, clean customer-
supplied strainer.
To reset the SERVICE DUE INDICATOR:
1. Turn the power switch to the OFF position.
2. Hold down the PUSH TO TEST and
CLOSED/OPEN buttons simultaneously.
3. Turn the power switch to the ON position.
4. Wait two seconds. Release the PUSH TO TEST
and CLOSED/OPEN buttons. The indicator is now
reset.
Returns to Manufacturer
If the dryer or a component of the dryer must be re-
turned to the manufacturer, first call your local distribu-
tor 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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