Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

100

C.C.

MODEL 39325.XXX AND 39335.XXX HEATMODEL 39325.XXX AND 39335.XXX HEAT

MODEL 39325.XXX AND 39335.XXX HEAT

PUMPSPUMPS

PUMPS

The cable assembly is a ten wire cable with seven of the ten

wires used. The thermostat end has a 10-pin flat connector

with seven positions used.

Pin 1 = Violet Wire

Pin 2 = Red Wire

Pin 3 = White Wire

Pin 4 = Black Wire

Pin 5 = Yellow Wire

Pin 6 = Blue Wire

Pin 7 = Brown Wire

The unit end has the above seven wires stripped and needs

to be wired to the corresponding color of wire in the electric

box of the unit. To check the cable assembly, first unplug

the thermostat end and disconnect each wire at the unit.

Next, check for continuity on each wire such as violet to

violet, red to red, etc. Continuity should be present from

violet to violet, red to red, etc.

Next, check for continuity from one wire to each of the other

wires. NO continuity should be present from one wire to any

other wire in the assembly.

393XX.XXX HEAT PUMP393XX.XXX HEAT PUMP

393XX.XXX HEAT PUMP

CABLE ASSEMBLYCABLE ASSEMBLY

CABLE ASSEMBLY

9F. REVERSING VALVE

The reversing valve is the heart of a heat pump. It directs

refrigerant flow to the coils to achieve proper direction of flow

that allows the same system to supply heated or cooled air to

enter the inside atmosphere of the structure according to

occupants' desires.

The reversing valve's solenoid can be energized in either

HEAT or COOL mode of operation. Most Duo-Therm Heat

Pumps have the solenoid energized in the COOL mode of

operation. The Dual (Model 39424) has the solenoid energized

in the HEAT mode of operation.

One way to check the reversing valve is to feel the refrigerant

line at the top of the inside coil. In the COOL mode, this line will

be cool or cold to the touch. In the HEAT mode, this line will be

warm or hot to the touch. If you do not achieve these results,

direction of refrigerant flow is not correct.

The ohms resistance of the reversing valve solenoid coil is

approximately 465 ohms plus or minus (±) 10%. If ohms

reading is within this range, the solenoid coil is good. If ohms

reading is outside this range, replace the solenoid coil.

On Model 39424, verify AC volts are to the solenoid coil when

in HEAT mode. If AC volts are NOT present, verify wiring is

correct and the 9-pin terminal connector is proper; and connec-

tion is completed through it. Next, verify power module board

and the relay are good. If AC volts are present and solenoid coil

is good, but refrigerant flow is not proper, the reversing valve

assembly needs to be replaced.

On all other models verify AC volts is to the solenoid coil when

in COOL mode. If AC volts is NOT present, verify wiring is

correct and the 6-pin terminal connector is proper; and connec-

tion is completed through it. Next, verify power module board

is correct, then verify relay is correct. If AC volts are present

and solenoid coil is good, but the refrigerant flow is not proper,

the reversing valve assembly needs to be replaced.