Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

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BIMETALBIMETAL

BIMETAL

This thermostat is designed to operate 12V DC single-

stage heat pump and an independent single-stage auxiliary

heat system. It is a manual changeover thermostat be-

tween heating, cooling and auxiliary heat. Operating tem-

peratures for both heating and cooling systems are change-

able to suit the comfort needs of the occupants.

This thermostat is used for a remote wall mounted thermo-

stat. Check the operation. Next, verify the wiring to the

thermostat is correct.

Thermostat Wiring for Dometic Bimetal ThermostatThermostat Wiring for Dometic Bimetal Thermostat

Thermostat Wiring for Dometic Bimetal Thermostat:

Route the ten-conductor cable from the unit to the thermo-

stat location. Leave enough cable to connect to the low

voltage cable. At the thermostat location, leave about six

(6") inches of cable extending through the wall. Plug the

thermostat cable into the thermostat connector cable.

When an auxiliary furnace is used with the heat pump, a two

conductor cable must be routed from the furnace to the

thermostat location. Connect one wire from the furnace to

the violet wires with a wirenut. Connect the other wire from

the furnace to the green wire in the thermostat cable and

secure with a wire nut. Tuck the excess wire back into the

wall and fill opening with insulation to prevent drafts that

could affect the thermostat operation. Secure the thermo-

stat to the wall using the two screws.

NOTE: Verify the heat anticipator is set properly for the

auxiliary furnace. Failure to set the anticipator can cause

incorrect operation or failure of thermostat in AUX HEAT or

HEAT PUMP setting.

CABLE ASSEMBLY CONNECTORCABLE ASSEMBLY CONNECTOR

CABLE ASSEMBLY CONNECTOR

Before checking the thermostat for operation, first determine

that the thermostat is receiving DC power from the relay board

then disconnect the cable assembly from the back of the

thermostat.

Next, use a DC voltmeter and check from red wire or Pin 2 on

cable assembly (positive [+] lead from voltmeter) to brown wire

or Pin 7 (negative [–] lead from voltmeter). You should get a

voltage reading of approximately 12V DC. Next, move the

negative (–) lead from the voltmeter to each of the following

wires or pins:

Blue (Pin 6), Yellow (Pin 5), Black (Pin 4) White (Pin 3)Blue (Pin 6), Yellow (Pin 5), Black (Pin 4) White (Pin 3)

Blue (Pin 6), Yellow (Pin 5), Black (Pin 4) White (Pin 3). You

should get a voltage reading of approximately 12V DC on each

wire. This indicates the relay board and cable assembly are

providing proper power and circuits to the thermostat.

NOTENOTE

NOTE: Pin 2 (red wire) is positive DC volts when ambient

(outside) air is above 40°F. Pin 1 (violet wire) is positive DC

volts when ambient (outside) air is below 40°F.

If the above voltage checks are correct and the unit does not

operate correctly, check the thermostat.

If the above voltage checks are not as described, check the

relay board and the cable assembly.

To check the thermostat, first remove it from its mounting on the

wall. Then disconnect the thermostat assembly from the cable

assembly in the wall. Now you are ready to do a continuity

check on the thermostat assembly. Place the positive (+) lead

from the ohm meter on red wire (Pin 2) and negative (–) lead

from the ohm meter to the active pin or wire to read continuity.

POLARITY IS IMPORTANT FOR A PROPER CHECK TO BEPOLARITY IS IMPORTANT FOR A PROPER CHECK TO BE

POLARITY IS IMPORTANT FOR A PROPER CHECK TO BE

DONEDONE

DONE.

With System Switch in COOL, Fan Switch in HI AUTO and

room temperature ABOVE setpoint temperature, you should

have continuity between red wire (Pin 2) to black wire (Pin 4),

yellow wire (Pin 5) and blue wire (Pin 6). You should NOT have

continuity between red wire to violet or white wires.