Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

100

10F. TRANSFORMER

The transformer supplies low AC volts for the control circuit on

the following air conditioner models:

39025.XXX, 39035.XXX & 39045.XXX39025.XXX, 39035.XXX & 39045.XXX

39025.XXX, 39035.XXX & 39045.XXX

The transformer is a 120 volt AC, 50/60 Hz. primary (line

terminals) with a 24 volt AC secondary (load terminals), and

will handle up to 20 volt-amps.

To check the transformer, first verify 120 volt AC is to the

line terminals. Next, verify at least 24 volt AC is on the load

terminals. If 24 volt AC is present on the load terminals, the

transformer is good. If 24 volt AC is

NOTNOT

NOT present on the

load terminals and 120 volt AC is present on the line termi-

nals, the transformer is defective.

11F. RELAY BOARD

The relay board is used on heat pump models:

39325.XXX, 39335.XXX & 39424.60139325.XXX, 39335.XXX & 39424.601

39325.XXX, 39335.XXX & 39424.601

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 temperature

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.

RELAY BOARDRELAY BOARD

RELAY BOARD

Next, remove the red, yellow, black and blue wires from

terminals RC, Y, G and H on the relay board. Place a jumper

from terminal RC to terminal Y. Provide power to the heat

pump. Using an incandescent bulb, check from AC white

terminal (one lead from bulb) to NO terminal on compressor

relay on the relay board (other lead from bulb). The bulb should

illuminate. Remove the jumper and the bulb would NOT

illuminate. Next, place a jumper from terminal RC to terminal G.

Now place one lead from bulb to AC white terminal and the

other lead from bulb to LOW FAN terminal. The bulb should

illuminate. Remove the jumper and the bulb should not illumi-

nate. Next, place a jumper from terminal RC to terminals G and

H. Now place one lead from bulb to AC white terminal and the

other lead from bulb to HIGH FAN. The bulb should illuminate.

Remove the jumper and the bulb should not illuminate. If these

tests are correct, the relay board is good. DO NOT replace it.

If any one of these tests are incorrect, replace the relay board.

13F. CHANGEOVER THERMOSTAT

The changeover thermostat is used on heat pump models:

39325.XXX, 39335.XXX and 39424.60139325.XXX, 39335.XXX and 39424.601

39325.XXX, 39335.XXX and 39424.601

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.

TB9

TB8

TB7

FREEZE

TB4

TB5

TB6

RELAY

10 AMP

RELAY

10 AMP

TB1

AC WHT

TB3

FAN HI

TB2

FAN LOW

COM

DOMETIC CORPORATION

ASM.#3104757.004

115V AC

INCANDESCENT

BULB

D.C.

VOLT