Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

The cable assembly for the Roof-Top Heat Pump is avail-

able in 15, 25 and 30 foot lengths. This cable assembly has

a male connector on one end (thermostat connection) and

a female connector on the other end (heat pump connec-

tion).

The cable assembly has 10 wires. The arrow on each

connector designates Pin 1.

To check the cable assembly, disconnect each end of

the cable assembly and check for continuity on each wire

in the assembly.

Also, check each connector for bent pins or loose wires.

Each wire has a receptacle that snaps into the connector.

CHANGEOVER THERMOSTATCHANGEOVER THERMOSTAT

CHANGEOVER THERMOSTAT

11E. CHANGEOVER THERMOSTAT

The changeover thermostat is a capillary tube/bellows-

type switch. Its function is to allow the compressor to

operate only when outside ambient is 40°F. or warmer.

To check the changeover thermostat, first verify the air

temperature at the capillary tube. If the temperatures are

above 45°F., continuity should be between terminals 2 to 3

and no continuity between terminals 2 to 1. For tempera-

tures below 40°F., continuity should be between terminals

2 to 1 and no continuity between terminals 2 to 3.

NOTE: A defective changeover thermostat can keep

the compressor from operating in the COOL or HEAT

PUMP modes.

12E. RELAY BOARD

The relay board consists of a transformer, compressor

relay, two fan relays and other components. If any one of

these are defective, the complete relay board must be

replaced.

The relay board completes circuits to the fan motor and

compressor depending on what mode switch and tem-

perature setting is on the thermostat.

Remove the cover from the electric box and verify the

red wire is on terminal RC, black wire is on terminal G, blue

wire is on terminal H and yellow wire is on terminal Y.

With AC power to the relay board, check between

terminals RC and G or H. There should be 12 volts DC. If

no voltage is detected, the transformer on the relay board

is defective. Replace the relay board.

If 12 volts DC is available, disconnect power to the heat

pump and remove the HI FAN wire (black) and the LOW

FAN wire (red) and the compressor wire (large black) from

the NO terminal on the compressor relay on the relay

board.

ROOF-TOP HEAT PUMP CABLE ASSEMBLYROOF-TOP HEAT PUMP CABLE ASSEMBLY

ROOF-TOP HEAT PUMP CABLE ASSEMBLY