Service manual

12B.4 Compressor #2 Checkout; Electric Heat Mode

Note: All Operating Functions Subject To Thermostat And P.C. Board Time Delays.

Thermostat or Sub-base Must Be In The Electric Mode.

Important Notice:

If the unit is equipped with a high pressure switch and this switch opens, it

Opens the 12 VDC (-) negative circuit from the thermostat to the P.C. Board

and all heat pump functions are dead. Be sure to correct the root problem causing

the high head pressure. If any heat pump function operates, the switch is OK.

Note:

Some coach manufacturers connect their energy management systems in series

with the 12VDC call for compressor #2. This is usually done between the output

Terminals on the P.C. Board and the Compressor #2 relay coil.