ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
Check that POWER ON light is on.
Ensure AC power has been on a minimum of 30 minutes for compressor
OFF, then to AUTO position.
To start automatic operation. set MODE SELECT switch to AUTO. This mode automatically changes from
heating to cooling and vice versa on demand of thermostat (HEAT light will be on during heating cycle only).
Check that CIRCULATE light is on.
Check HEAT and COOL pilot lights. Both cycle on and off depending upon which cycle is operating according to
Check that the following heights are off:
HIGH DISC PRESSURE,
LOW SUC PRESSURE, and
If any light (except POWER ON, HEAT, COOL or CIRCULATE) is on, turn MODE
SELECT switch to OFF. Contact unit maintenance.
Perform "during operation" preventive maintenance checks and services (table 2-1).