Compressor attempts to start but doesn’t:
1.
Check capacitor.
2.
Check for defective compressor by making
resistance check on winding.
3.
Check run capacitor.
Compressor runs in short cycle:
1.
Check thermostat mounting and location.
2.
Check all relays, relaying and contacts.
3.
Check run capacitor.
4.
Check high pressure switch.
5.
Check low temperature switch.
6.
See if reversing valve has not fully shifted to either side.
Insufficient cooling or heating:
1.
Check thermostat for improper location.
2.
Airflow may be insufficient. Check and clean the
filter, or placement of furniture or other articles that
may cause restrictions such as drapes, etc.
3.
The reversing valve may be defective, creating a
bypass of refrigerant. If the unit will not heat, check
the reversing valve coil.
4.
Check capillary tubes for possible restriction of
refrigerant flow.
5.
Check for restriction in water flow.
Insufficient water flow through
condenser:
1.
Check to see that valves are open all the way.
2.
Check for air in lines.
3.
Check circulating pump.
Water drips from conditioner:
1.
Check for plugged condensate drain.
2.
Check for dirty filter.
3.
Check to see if condensate drain runs uphill.
4.
See if blower motor is up to speed.
5.
Check for loose or mispositioned blower.
6.
Are drains properly trapped?
Noisy unit operation:
1.
Check for fan wheel hitting the housing. Adjust for
clearance.
2.
Check for bent fan wheel. Replace if damaged.
3.
Check for loose fan wheel on shaft. Tighten.
4.
Make sure compressor is floating free on its isolator
mounts.
5.
Check for tubing touching compressor or other
surface. Readjust tubing by bending slightly.
6.
Check screws on all panels. Tighten.
7.
Check for chattering or humming in the contactor
relays due to low voltage or a defective holding coil.
Replace component.
8.
Check water balance to unit for proper water flow rate.
IM 447-11
24
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