Dometic 630025 Instructions d'exploitation télécharger pdf (Page 68)

C.C.

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

thermostat. The heat pump can have an air distribution box

or a ducted system. To check the operation refer to Section

1.3. 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 (10) conductor cable from the 14" x 14" opening

to the thermostat location. Leave enough cable within the

14" x 14" opening 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 de-

termine 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 (PinBlue (Pin 6), Yellow (Pin 5), Black (Pin 4) White (Pin

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

3)3)

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 (Section 4.5) and the cable assembly (4.3).

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 FORPOLARITY IS IMPORTANT FOR

POLARITY IS IMPORTANT FOR

A PROPER CHECK TO BE DONEA PROPER CHECK TO BE DONE

A PROPER CHECK TO BE 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.

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Dometic 630025 Instructions d'exploitation Page 68

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