Trouble Shooting; Basic Air Conditioning Trouble Shooting Check List - Thermostat Version - nvent SPECTRACOOL G52 Instruction Manual

TROUBLE SHOOTING

BASIC AIR CONDITIONING TROUBLE SHOOTING CHECK LIST - THERMOSTAT VERSION

1. Check manufacturer's nameplate located on the unit for correct power supply.
2. Turn on power to the unit. The evaporator (Enclosure or "COLD" air) impeller should come on. Is
there airflow?
YES, proceed to step 3.
NO, possible problem:
» Open motor winding
» Stuck impeller motor
» Obstructed wheel
3. Check thermostat setting and adjust thermostat to the lowest setting. This should turn the
condenser impellers and the compressor on. Did condenser impellers and compressor come on
when the thermostat was turned on?
YES, proceed to step 4.
NO, possible problem:
» Tripped customer door switch
» Defective thermostat
4. Are all impellers and the compressor running? If not the unit will not cool properly.
5. Check condenser (Ambient or "HOT" air) impellers for airflow. Is there airflow?
YES, proceed to step 6.
NO, possible problem:
» Defective thermostat
» Open motor winding
» Stuck impeller motor
» Obstructed wheel
6. Carefully check the compressor for operation - motor should cause slight vibration, and the outer
case of the compressor should be warm. Is the compressor showing signs of this?
YES, wait 5 minutes, then proceed to step 7.
NO, possible problem:
» Defective thermostat
» Defective overload
» Defective relay
7. Make sure the coils are clean. Then check evaporator "air in" and "air out" temperatures. If the
temperatures are the same:
» Possible loss of refrigerant
» Possible bad valves in the compressor
8. To check for a bad thermostat, turn power to the unit off. Remove the upper access panel and
place both thermostat wires onto one terminal (replace upper access panel for safety). This will
activate the switch in the thermostat. Turn the power on and if all impellers and the compressor
come on, the thermostat needs to be replaced.
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