Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

To check ACTIVE terminals: Place the negative (–) lead from

the DC voltmeter on terminal B (black wire) and the positive (+)

lead to the ACTIVE terminal. When the SYSTEM switch is in

the COOL position and room temperature is more than two

degrees ABOVE set point temperature, terminal Y2 is ACTIVE

thirty seconds after terminal Y2 is ACTIVE.

E.E.

MODEL 39424.601 & 393XX.XXXMODEL 39424.601 & 393XX.XXX

MODEL 39424.601 & 393XX.XXX

DIGITALDIGITAL

DIGITAL

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 between heat-

ing, cooling and auxiliary heat. It also incorporates time delay

circuitry to protect against system short cycling.

There is a time delay of approximately three minutes between

OFF and ON cycles.

Default temperatures of 65°F. for heat and 75°F. for cool have

been incorporated into this thermostat. If the thermostat is

without power for 10 to 15 seconds, it will default to these

temperatures.

Operating temperatures for both heating and cooling systems

are changeable to suit the comfort needs of the occupants.

This thermostat is used as a remote wall mounted thermostat.

The heat pump can have an air distribution box or a ducted

system.

Next, verify the wiring to the thermostat is correct.

Thermostat Wiring for DIGITAL Thermostat:Thermostat Wiring for DIGITAL Thermostat:

Thermostat Wiring for DIGITAL Thermostat:

Route the ten-conductor cable from the 14" x 14" opening to the

thermostat location. Route a two-conductor cable from the

coach's 12 volt DC power source to the thermostat location.

Connect 12 volt

positivepositive

positive lead to the green wire on the

thermostat cable.

Connect the 12 volt DC volt

negativenegative

negative lead to the brown lead.

Secure both connections using wire nuts.

NOTE: The DC volt connections are needed to power the liquid

crystal display (LCD) and thermostat in the AUX. HEAT mode

when 115 volt AC is not available.

At the thermostat location, leave about six inches of cable

extending through the wall. Plug the thermostat cable into the

thermostat connector.

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

wire conductor must be routed from the furnace to the thermo-

stat location. Connect this wire from the furnace to the violet

pigtail at the thermostat and secure with wire nut. Tuck the

excess wire back into the wall and fill opening with insulation to

prevent drafts that could affect the thermostat operation. Using

the two screws provided, secure the thermostat to the wall.

THERMOSTAT CONNECTIONSTHERMOSTAT CONNECTIONS

THERMOSTAT CONNECTIONS

NOTENOTE

NOTE: The furnace has two wires for thermostat connections.

One wire should be marked 12V DC or (+) and the other wire

may be unmarked, or labeled "thermostat". The wire marked

12V DC or (+) should be capped and not used with the heat

pump setup. The wire marked "thermostat" or the unmarked

wire is the wire to connect to the violet thermostat pigtail.

If the 12V DC(+) is hooked to the violet wire at theIf the 12V DC(+) is hooked to the violet wire at the

If the 12V DC(+) is hooked to the violet wire at the

thermostat, the heat pump fan motor will NOT operate inthermostat, the heat pump fan motor will NOT operate in

thermostat, the heat pump fan motor will NOT operate in

any mode.any mode.

any mode.

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.