Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

D.D.

MODEL 39224.601MODEL 39224.601

MODEL 39224.601

This thermostat is designed to operate DC volt controlled

air conditioner systems and an independent heat system.

It is a manual changeover thermostat between heating and

cooling. It also incorporates time delay circuitry to protect

against system short cycling. This thermostat has delay

circuitry on start-up so Circuit 1 compressor starts after fan

motors, then delay circuitry for Circuit 2 compressor start.

It is an electronic thermostat with three pushbuttons (MODE,

SET TEMPERATURE UP AND DOWN) and an LCD

(Liquid Crystal Display).

To check the thermostat, first verify the wiring to it is

correct. A two-conductor cable, 18 to 22 AWG is required

for the DC volt power source. This MUST be routed to the

system at the thermostat. There is a nine-terminal block on

the back of the thermostat.

Looking at the back of the thermostat, the terminal desig-

nation from right-to-left is

Y2Y2

Y2,

Y1Y1

Y1,

GHGH

GH,

GL GL

GL and the

last two are not designated. DC volt supply wires into

terminal R, positive (+); and terminal B, negative (–). There

is a five-wire (white, yellow, black orange and blue) harness

assembly that wires into the terminal block also. White

goes to

Y2Y2

Y2, yellow goes to

Y1Y1

Y1, black goes to

B (this

makes two wires on this terminal), orange goes to

GHGH

GH, and

blue goes to

GLGL

GL. If a furnace is wired to the thermostat the

two furnace thermostat wires

MUSTMUST

MUST be wired correctly.

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 (+) must be wired to terminal

W. The unmarked

wire (or one labeled "thermostat") must be wired to

terminal (this will be the third wire to this terminal).

by Dometic

THERMOSTAT

Display delayed 1 minute at turn on.

Actual

Cool

Heat

Set Temperature

COOL

HEAT

OFF

FAN

HIGH

LOW

HIGH

LOW

AUTO

MODE UP DOWN

THERMOSTATTHERMOSTAT

THERMOSTAT

BACK OF THERMOSTATBACK OF THERMOSTAT

BACK OF THERMOSTAT

To check the thermostat, first verify positive (+) DC is to

terminal

R and negative (–) is to terminal

B, at the back of the

thermostat. Operating range is 10 to 16 volts DC. NOTE: To

check voltage between terminals, at the back of the thermo-

stat, place the negative (–) lead from the voltmeter to terminal

B and the positive (+) lead from the voltmeter to the ACTIVE

terminal.

With the SYSTEM switch to COOL and FAN switch to HIGH

AUTO and room temperature ABOVE setpoint temperature,

you should have voltage between terminal

B (black wire) to

terminal

Y1Y1

Y1 (yellow wire) and terminal

B (black wire) to terminal

GHGH

GH (orange wire). You should NOT have voltage between

terminal

B (black wire) to terminals

GLGL

GL (blue wire) and

W. With

room temperature BELOW setpoint temperature you should

NOT have voltage between terminal

B (black wire) to terminals

Y1Y1

Y1,

Y2Y2

Y2,

GLGL

GL,

GHGH

GH or

NOTENOTE

NOTE: When setpoint temperature is changed above or below

room temperature, there will be a three minute delay in "active"

terminals. If setpoint temperature is more than two degrees

from room temperature, there will be a thirty second delay to

Y2Y2

terminal after

Y1Y1

Y1 terminal is active.

With SYSTEM switch to COOL and FAN switch to AUTO LOW,

and room temperature is above setpoint temperature, you

should have voltage between terminal

B (black wire) to terminal

Y1Y1

Y1 (yellow wire) and terminal

B (black wire) to terminal

GLGL

GL (blue

wire). You should

NOTNOT

NOT have voltage between terminal

B (black

wire) to terminals

GHGH

GH (orange) and

W. With room temperature

BELOW setpoint temperature you should NOT have voltage

between terminal

B (black wire) to terminals

Y1Y1

Y1,

Y2Y2

Y2,

GLGL

GL,

GHGH

and

NOTENOTE

NOTE: When setpoint temperature is changed above or below

room temperature, there will be a three minute delay in "active"

terminals. If setpoint temperature is more than two degrees

from room temperature, there will be a thirty second delay to

Y2Y2

terminal after

Y1Y1

Y1 terminal is active.