Troubleshooting Guide - Gardner Denver RNC Series Instruction Manual

4.0 TROUBLESHOOTING GUIDE

SYMPTOM
A) Water downstream of dryer
B) High pressure drop across dryer
C) Checkpoint faults
1. Power on light off
2. Compressor on light off
3. Alarm/Service alert light on -check
Display for active conditions
SERVICE DRYER
LOW PRESSURE
HIGH PRESSURE
NOTE: If high refrigerant pressure
occurs, switch must be manually reset
HIGH EVAPORATOR TEMPERATURE
(also observed as high reading on
temperature indicator)
DRAIN
COMPRESSOR
HEATER
TEMP SENSOR
NOTE: After fault correction, press reset button to clear display
16
POSSIBLE CAUSE(S)
1. Residual free moisture remaining in downstream
pipelines.
2. Air bypass system is open.
3. Inlet and Outlet connections are reversed.
4. Air lines downstream of dryer are exposed to
temperatures below the dew point.
5. Excessive free moisture (bulk liquid) at dryer
inlet.
6. Condensate not being drained.
7. Dryer overloaded resulting in elevated dew point.
8. Refrigeration system not functioning.
1. Excessive air flow.
2. Freezing of moisture in evaporator because of
refrigeration system fault.
3. Filter loaded with solid particulates.
1. Power failure; open circuit.
1. Compressor commanded off by manual switch or
programmed schedule.
2. Open circuit.
3. Control circuit open on high or low pressure
cutout.
1. Service interval specified has elapsed.
1. Hot gas bypass valve requires adjustment
2. Low on refrigerant/refrigerant leak.
1. Lack of condenser cooling.
Air-cooled - Ambient temperature too high,
clogged condenser fins, obstructed flow across
condenser, faulty fan motor or fan control switch.
2. Water-cooled - Cooling temperature too high,
flow too low, clogged strainer, faulty water
regulating valve.
1. Dryer overloaded.
2. Refrigeration system off or not cooling
sufficiently.
1. Drain line restricted or frozen.
2. Drain mechanism faulty.
1. Faulty compressor contactor.
2. Faulty N.O. auxiliary contact on compressor
contactor.
1. Faulty compressor contactor.
2. Faulty N.C. auxiliary contact on compressor
contactor.
3. Faulty heater.
1. Temperature sensor or wiring to sensor is open
(none of the LED's in the temperature display will
be illuminated).
2. Temperature sensor or wiring to sensor is shorted
(all of the LEDs in the temperature display will be
illuminated).
CORRECTIVE ACTION
1. Blow out system with dry air.
2. Check valve positions.
3. Check for correct connection.
4. Insulate or heat trace air lines exposed to low
ambients or dry air to lower dew point.
5. Install separator ahead of dryer.
6. See C below.
7. See C below.
8. See C below.
1. Check flow rate.
2. See C below.
3. Replace filter element.
1. Check for power to dryer.
1. Check current command status.
2. Check power to compressor.
3. Check display for fault.
1. Perform scheduled service.
1. Contact qualified technician or manufacturer's
service department.
1. Check air temperature 6" in front of condenser;
Clean condenser and check for free air flow;
Check fan and switch operation.
2. Check cooling medium temperature and flow,
clean strainer, check valve operation.
1. Check compressed air inlet flow, temperature,
and pressure.
2. Check power to unit, power to compressor, Low
or High pressure faults. Have qualified technician
evaluate system.
1. Open drain line.
2. Check drain by pressing "Push to Test" button
on control panel. If faulty, isolate drain. Rebuild
automatic drain.
1. Check wiring and operation of contactor.
2. Check wiring and operation of auxiliary contact.
1. Check wiring and operation of contactor.
2. Check wiring and operation of auxiliary contact.
3. Check heater element for continuity.
1. Replace sensor or repair wiring.
2. Replace sensor or repair wiring.