FScurtis RNP Series, Operator'S Manual

Page: 8 / 16

8
FIELD SERVICE GUIDE
Problems most frequently encountered with refrigerated
dryers 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
dangerous. 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 accumulate in low places. Inhalation of high
concentrations may be fatal. All refrigerants must be
recovered per EPA requirements.
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 system, completely vent the internal pressure to the
atmosphere.
PROBLEM SYMPTOM POSSIBLE CAUSE REMEDY
Water Downstream of
Dryer
Refrigerant compressor not
running.
Loss of power to dryer Check power supply, fuses and/or breakers. Check
for loose connections.
Dryer turned off. Check On/Off switch position.
Dryer overloaded. Confirm that inlet flow, inlet temperature and inlet
pressure are within acceptable range of dryer.
Condenser clogged with debris. Check/clean ambient air filter and condenser.
Fan motor inoperative Check fan motor operation. Replace if necessary.
Ambient temperature too high. Verify ambient temperature throughout day.
High pressure switch activated
(models 200 to 500 only)
Press manual reset button to switch to reset button.
Compressor overheated. Turn dryer off. Contact local distributor.
Compressor defective. Turn dryer off. Contact local distributor.
No condensate discharging from
dryer.
Drain strainer clogged. Clean drain strainer.
Drain valve inoperative. Check/rebuild drain valve.
Drain timer or DSM inoperative. Confirm there is power to the timer or DSM.
Replace timer or DSM, if necessary.
Drain solenoid inoperative. Confirm there is power to the coil. Replace coil, if
necessary.
Condensate discharging from dryer. Incorrect drain timer setting. Adjust drain timer - increase open time and/or
decrease closed time.
Liquid water entering dryer. Aftercooler drain valve malfunction. Check, repair aftercooler drain valve.
Excessive Pressure
Drop Across Dryer
Frozen condensate in evaporator. Incorrect hot gas bypass valve
setting.
Contact local distributor.
Inlet air pressure low. Upstream restriction in air system. Check all upstream air system components (valves,
regulators, etc.)
Dryer undersized. Excessive compressed air flow. Resize dryer.
Dew Point Indicator
Out of Green Zone
Dryer overloaded. Confirm that inlet flow, inlet temperature and inlet
pressure are within acceptable range of dryer.
Condenser clogged with debris. Check/clean ambient air filter and condenser.
Loose sensor connection. Confirm gauge or DSM sensor is tightly connected
to dryer tubing.
Defective gauge, DSM or DSM
sensor.
Replace gauge, DSM or DSM sensor.