Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

TB9

TB8 TB7

FREEZE

TB4

TB5

TB6

RELAY

10 A MP

RELAY

10 A MP

TB1

AC W HT

TB3

FAN HI

TB2

FAN LOW

COM

DOMETIC CORP ORATION

ASM. #3104757.004

115V A C

INCANDESCENT

BULB

D.C.

VOLT

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 illuminate. 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.

13E. RELAY, DOUBLE THROW

The relay controls AC power to the reversing valve. There

are two different relays used. One relay has a 12V DC rated

coil and is used on all Duo-Therm Heat Pumps except the

mechanical control types. The mechanical control Duo-

Therm Heat Pumps use a relay that has a 120V AC rated

coil. Both relays have five (5) terminals. Terminals 1 and 3

are the coil terminals. When the coil (terminals 1 and 3) is

not energized (no power to terminals 1 and 3), continuity

should exist between terminals 4 to 5; and no continuity

between terminals 2 to 4.

When the coil (terminals 1 and 3) is energized (power to

terminals 1 and 3), continuity should exist between termi-

nals 2 to 4 and no continuity between terminals 4 to 5.

RELARELA

RELA