Field Service Guide - Gardner Denver RGD Series Instruction Manual

FIELD SERVICE GUIDE

Problems most frequently encountered with refrigerated dry-
ers are water downstream of the dryer and excessive pressure
drop. Most causes can be identified and remedied by following
this guide.
Closed refrigeration systems are potentially dan-
gerous. Work on the refrigeration system must be done only
by a competent licensed refrigeration mechanic. Do not release
fluorocarbon refrigerants to the atmosphere. Do not discharge
liquid refrigerants into floor drains. Refrigerant vapors may accu-
mulate in low places. Inhalation of high concentrations may be
fatal. All refrigerants must be recovered per EPA requirements.
PROBLEM
Water Downstream of Refrigerant compressor not
Dryer running.
No condensate discharging from
dryer.
Condensate discharging from dryer.
Liquid water entering dryer.
Excessive Pressure Frozen condensate in evaporator.
Drop Across Dryer
Inlet air pressure low.
Dryer undersized.
Dew Point Indicator
Dew Point Indicator Out of Green
Out of Green Zone Zone
SYMPTOM
Loss of power to dryer
Dryer turned off.
Dryer overloaded.
Condenser clogged with debris.
Fan motor inoperative
Ambient temperature too high.
High pressure switch activated
(models 200 to 500 only)
Compressor overheated.
Compressor defective.
Drain strainer clogged.
Drain valve inoperative.
Drain timer or DSM inoperative.
Drain solenoid inoperative.
Incorrect drain timer setting.
Aftercooler drain valve malfunction.
Incorrect constant pressure valve
setting.
Upstream restriction in air system.
Excessive compressed air flow.
Dryer overloaded.
Condenser clogged with debris.
Loose sensor connection.
Defective gauge, DSM or DSM
sensor.
Do not smoke when a refrigeration leak is suspected. Burning
materials may decompose refrigerants, forming a toxic gas or
acids that may cause serious injury and property damage.
Before dismantling any part of the dryer or compressed air sys-
tem, completely vent the internal pressure to the atmosphere.
POSSIBLE CAUSE REMEDY
Check power supply, fuses and/or breakers. Check
for loose connections.
Check On/Off switch position.
Confirm that inlet flow, inlet temperature and inlet
pressure are within acceptable range of dryer.
Check/clean condenser.
Check fan motor operation. Replace if necessary.
Verify ambient temperature throughout day.
Press manual reset button to switch to reset button.
Turn dryer off. Contact local distributor.
Turn dryer off. Contact local distributor.
Clean drain strainer.
Check/rebuild drain valve.
Confirm there is power to the timer or DSM. Replace
timer or DSM, if necessary.
Confirm there is power to the coil. Replace coil, if
necessary.
Adjust drain timer - increase open time and/or
decrease closed time.
Check, repair aftercooler drain valve.
Contact local distributor.
Check all upstream air system components (valves,
regulators, etc.)
Resize dryer.
Confirm that inlet flow, inlet temperature and inlet
pressure are within acceptable range of dryer.
Check/clean condenser.
Confirm gauge or DSM sensor is tightly connected
to dryer tubing.
Replace gauge, DSM or DSM sensor.
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