TM 9-4120-395-14&P
4-15. TRUBLESHOOTING - Continued
Table 4-2. Unit Maintenance Troubleshooting- Continued
MALFUNCTION
TEST OT INSPECTED
CORRECTIVE ACTION
7. REDUCED HEATING CAPACITY.
Step 1. Check airflow out of conditioned air discharge grille. If airflow volume is low:
a. Replace air filter. See para 4-20.
b. Clean coils. See para 4-48 and 4-49.
Step 2. Check adjustment of fresh air damper. See para 4-21.
Adjust properly. See para 4-21.
Disconnect input power before performing internal electrical troubleshooting.
Voltages can be deadly.
Step 3. Test heater element. See para 4-41.
Replace It defective. See para 4-41.
8. REDUCED COOLING CAPACITY.
High voltage is used in the operation of this equipment. Death on contact or severe injury may
result if personnel fail to observe safety precautions.
Step 1. Check air flow out of conditioned air discharge grille. If air flow volume is low:
a. Replace air filter. See para 4-20.
b. Clean coils. See para 4-48 and 4-49.
Step 2. Check adjustment of fresh air damper. See para 4-21.
Adjust properly. See para 4-21.
Step 3. Inspect thermostat. See para 4-50.
Replace If defective. See para 4-50.
4-22
