TM 9-4120-385-14
Table 5-1. TROUBLESHOOTING FOR DIRECT SUPPORT MAINTENANCE Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
INSUFFICIENT COOLING ACTION
3.
NOTE
At outside temperatures below 0F(18C) the LPCO must be
jumpered to operate in COOL mode. Refer to Paragraph 5-18.
Check control settings.
Step 1.
a. Move mode selector switch to COOL.
b. Move temperature selector switch to INCREASE.
If normal cooling does not resume in 15 minutes, go to Step 2.
NOTE
Frost on the evaporator coil is usually caused by an obstruction to
air flow or dirty evaporator coil, filter, or mist eliminator.
Make sure louvers are open.
Step 2.
Replace if defective. Refer to Paragraph 4-12.
Step 3.
Check to make sure evaporator and condenser fans are tight on motor
shaft. Refer to Paragraph 4-24.
Tighten if loose. Refer to Paragraph 4-24.
5-5
