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 TM9-4120-423-14&P
3.
INSUFFICIENT COOLING - Continued
TEST OR INSPECTION
Step 3. Inspect fresh air and return air filters, for dirt or blockage.
CORRECTIVE ACTION
Clean filter/remove blockage.
TEST OR INSPECTION
Step 4. Check that condenser air is not blocked.
CORRECTIVE ACTION
Fabric condenser cover must be rolled up and tied.
Remove any obstruction from
condenser inlet or discharge.
TEST OR INSPECTION
Step 5. Check that high-pressure cutout, reset is not tripped.
CORRECTIVE ACTION
Press in to reset.
TEST OR INSPECTION
Step 6. Check fresh air inlet for heat source.
CORRECTIVE ACTION
Move all heat sources, over 50Ε F (10Ε C) above outside ambient, at least 10 feet from
fresh air inlet.
TEST OR INSPECTION
Step 7. After 15 minutes of operation in COOL mode with TEMPERATURE CONTROL set to
COOLER position, check sight glass. Refrigerant should be clear and center indicator
should be green.
CORRECTIVE ACTION
If refrigerant is milky or many bubbles are seen, leak test, repair and recharge as
TEST OR INSPECTION
Step 8. Check refrigerant system.
CORRECTIVE ACTION
(a)
Measure ambient outside temperature.
(b)
Apply power.
(c)
Operate air conditioner in COOL mode with maximum COOLER temperature
setting for at least 15 minutes.
Measure condenser discharge air temperature which should be 35Ε plus or minus
(d)
5Ε F above ambient.
0067 00-8
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