McLean Cooling Technology ProAir CR43 Instruction Manual download pdf (Page 12)

10-1008-130 rev.14

TROUBLE SHOOTING

Basic Air Conditioning Trouble Shooting Check List

1. Check manufacturer’s nameplate located on the unit for correct power supply.

2. Turn the power to the unit on. The evaporator (Enclosure or “COLD” air) blower should come on.

Is there airflow?

YES, proceed to step # 3.

NO, possible: Open motor winding

Stuck blower motor

Obstructed wheels/blades

3. Check thermostat setting? Adjust thermostat to the lowest setting

. This should turn the

condenser blower and the compressor on. Did condenser blower and compressor come on when the

thermostat was turned on?

YES, proceed to step #4.

NO, possible: Defective thermostat

4. Are both blowers and the compressor running? If not the unit will not cool properly.

5. Check condenser ( Ambient or “HOT” air ) blower for airflow. Is there airflow ?

YES, proceed to step # 6.

NO, possible: Defective thermostat

Open motor winding

Stuck blower motor

Obstructed wheels/blades

6. Carefully check the compressor for operation - motor should cause slight vibration, and the outer

case of the compressor should be warm.

YES, wait 5 minutes, then proceed to step #7.

NO, possible: Defective thermostat

Defective capacitor

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 control box cover, place both

thermostat wires onto one terminal (replace control box cover for safety). This will bypass the

switch in the thermostat. Turn the power on. If both blowers and the compressor come on, the

thermostat needs to be replaced.

Repair or Replace

defective parts.

lace

art.

Repair or Replace

defective parts.

Repair or Replace

defective parts.

Repair or Replace

defective parts.

317-257-6811 www.McLeanParts.net 317-257-1590 fax

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McLean Cooling Technology ProAir CR43 Instruction Manual Page 12

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