Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

2)2)

DC VOLT CONTROLLEDDC VOLT CONTROLLED

DC VOLT CONTROLLED

NOTENOTE

NOTE: The PAL tester with the air conditioning module

attached, will allow for proper testing of communication

integrity between the control board and main board. The

PAL and the AIR CONDITIONER MODULE are available

from your Dometic parts distributor.

This control board is wired to a DC volt supply and is

capable of operating a DC volt furnace as well as operating

the air conditioner. Only one of these will operate at a time.

When the mode selection switch is at GAS HEAT, no lights

for the air conditioner will illuminate.

DC volts is wired to the control board by attaching positive

(+) DC to the red wire and negative (–) to the black wire.

POLARITY has to be correct for operation. With the Center

Slide (Power) switch to ON, all the way to the right, the

control board sends DC volts to the main board and the

main board sends signals to control board. It then com-

pletes the signals according to fan selection and mode

selection to the appropriate appliance.

The DC volt operation range is 10 to 16 volts. To verify DC

volts, check between the black wire and the red wire. If no

volts are detected or voltage is outside of the operation

range, correct the DC volt supply. If voltage is within the

operating range, next check between Pin 1 and 10 on the

cable. The voltage should be the same. If none is detected,

the control pad is defective. Before replacing the part, verify

where the shorted wire is and correct the problem. The

most likely problem area would be in the cable that con-

nects the main board and control board.

GND

FLAT

RIBBON

CABLE

ARROW F OR

PIN #1

BLUE

FURNACE

RED (+) DC

BLACK (-)DC

}

GREEN

DEVICE

CR1

CR2

To check the gas heat mode, verify the control board

is turned on, temperature control slide is all the way to the

right, mode switch is to gas heat position and green LED

is on. Next, remove furnace wiring from the two blue wires.

Then check for continuity on the blue wires. Continuity

means the thermostat is good.

BE SURE BE SURE

BE SURE

THE FOLLOTHE FOLLO

THE FOLLO

WING CHECK IS DONE PRWING CHECK IS DONE PR

WING CHECK IS DONE PR

OP-OP-

OP-

ERLERL

ERL

AN INCORRECT AN INCORRECT

AN INCORRECT

TEST TEST

TEST

WILL DWILL D

WILL D

AMAAMA

AMA

GE GE

THE CON-THE CON-

THE CON-

TRTR

OL BOOL BO

OL BO

ARDARD

ARD

If your results are no continuity, then check for DC

volts between black wire and bottom of

CR2 AnodeCR2 Anode

CR2 Anode (side

closest to green device). If DC volts are not present, check

cable and main board. If DC volts are present (10 to 16),

place a jumper wire between black wire and bottom of CR2

Anode. Next check continuity on the blue wires. Lack of

continuity designates a defective control board. A continu-

ity reading indicates a problem with the cable or main board.

If the furnace continues to operate when the control

board is turned “OFF”, check continuity on blue wires. Lack

of continuity designates the control board is good. Conti-

nuity on the blue wires designates a defective control board.

DC VOLT CONTROLLEDDC VOLT CONTROLLED

DC VOLT CONTROLLED