ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
Table 4-2. Unit Maintenance Troubleshooting - Continued
Test or Inspection
Check that all doors, windows and other openings in the room or enclosure are tightly closed
Tightly close all openings.
Check operation of thermostat (S2).
Disconnect input power before performing internal electrical
troubleshooting. Voltages used can KILL
Step 3. Check for loose or damaged electrical connections or damaged wires in wiring harnesses (see fig FO-2).
Tighten loose terminals.
Step 4. Check individual elements of heater (HR1 and HR2).
Step 5. Check operation of heater contactors (K4) and (K5).
Step 6. Check operation of heat fault thermostat (S8).
Step 7. Check operation of heat limit switches (S9) and (S10).
Step 8. Check operation of heat fault slave relay (K15).
Step 9. Check operation of heat fault relay (K10).