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Table 41 — Troubleshooting
SYMPTOMS CAUSE REMEDY
Cooler Circulating Pump Does
Not Run
Power line open Reset circuit breaker.
Control fuse or circuit breaker open Check control circuit for ground or short. Reset breaker and
replace fuse.
Tripped power breaker Check the controls. Find the cause of trip and reset breaker.
Loose terminal connection Check connections.
Improperly wired controls Check wiring and rewire if necessary.
Low line voltage Check line voltage — determine location of
voltage drop and remedy deficiency.
Pump motor defective Check motor winding for open or short.
Replace compressor if necessary.
Pump seized Replace pump.
Compressor Cycles
Off on Loss of Charge
Low refrigerant charge Repair leak and recharge.
Compressor Cycles Off on Cooler
Freeze Protection
Thermistor failure Replace thermistor.
System load was reduced faster than controller could
remove stages
Unit will restart after fluid temperature rises back into the
control band. Avoid rapidly removing system load.
Compressor Shuts Down on
High-Pressure Control
High-pressure control acting erratically Replace control.
Noncondensables in system Evacuate and recharge.
Condenser dirty Clean condenser.
Fans not operating Repair or replace if defective.
System overcharged with refrigerant Reduce charge.
Unit Operates Too Long
or Continuously
Low refrigerant charge Add refrigerant.
Control contacts fused Replace control.
Partially plugged or plugged expansion valve or filter drier Clean or replace as needed.
Defective insulation Replace or repair as needed.
Damaged compressor Check compressor and replace if necessary.
Unusual or Loud System
Noises
Piping vibration Support piping as required.
Check for loose pipe connections or damaged compressor
Compressor noisy Replace compressor (worn bearings).
Check for loose compressor holddown bolts.
Compressor Loses Oil Leak in system Repair leak.
Mechanical damage (Failed seals or broken scrolls) Replace compressor.
Oil trapped in line Check piping for oil traps.
Hot Liquid Line Shortage of refrigerant due to leak Repair leak and recharge.
Frosted Liquid Line Restricted filter drier Replace filter drier.
Frosted Suction Line Expansion valve admitting excess refrigerant (note: this is a
normal condition for brine applications)
Replace valve if defective.
Stuck EXV Replace valve if defective.
Freeze-Up Improper charging Make sure a full quantity of fluid is flowing through the cooler
while charging, and suction pressure in cooler is equal to or
greater than pressure corresponding to 32 F (0° C).
System not drained for winter shutdown Recommended that system be filled with an appropriate gly-
col mixture to prevent freezing of pumps and fluid tubing.
Loose Thermistor Verify thermistors are fully inserted in wells.