Schreiber Chillers Modular Chillers - Manual (Page 33)

33
TROUBLE SHOOTING- PART I
SYMPTOM DIAGNOSIS REMEDY
Compressor won’t run
Check
Power supply
Electrical circuit
Check
Line load voltage
Temperature control
Compressor overload
Low pressure switch
High pressure switch
Manual switch
Compressor
All control circuit
Correct circuit breaker Repair
or replace bad circuit
Correct voltage condition
Repair or replace
Replace
Repair or replace
Repair or replace
Replace
Replace
Repair
Compressor runs
No Refrigeration
Refrigerant leak
Stuck expansion valve
Repair leak and recharge
Replace expansion valve
High pressure trips Condenser motor
Air over condenser restricted
Service panel not in place
Repair or replace motor
Clean condenser
Install service panel
Low pressure switch
Cutting out
Defective expansion
Refrigerant leak
Replace expansion valve
Repair leak
Temperature too high Dial thermometer
Temperature controller
Water pump off
Re-adjust or replace
Replace
Check controls circuit
Temperature too cold Dial thermometer
Temperature controller
Water pump off
Out of adjustment
Repair or replace
Not circulating water
TROUBLE SHOOTING – PART II
REFRIGERATION SYSTEM INTERNAL PRESSURE USING REFRIGERANT R-22
*High Pressure Switch: Manual Reset- Cut out at 410 P.S.I.
*Low Pressure Switch: Automatic Reset – Cut out at 15 P.S.I.
WORKING REFRIGERANT PRESSURE R-22
*High
Pressure: 185 to 325 P.S.I.
*Low Pressure: 45 to 70 P.S.I.
***NOTE***
These pressures are under normal ambient temperatures and chilled water temperatures.