Warning, Adjust defrost system – Whirlpool GOLD W4GH6 User Manual

Page 13

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13

Time Delay

The time delay is 5 minutes long. The delay helps to protect the
compressor from short cycling in case the power to the heat
pump is interrupted or a pressure switch opens. The delay is
bypassed by placing the timer select jumper across the TEST
pins for 0.5 seconds.

Pressure Switch Circuit

The defrost control includes LO-PS terminals to connect an
optional low pressure (loss of charge pressure) switch. A high
pressure switch (optional) can be connected to the HI PS
terminals. See “Defrost Control Board” in the “Adjust Defrost
System” section.

During a single demand cycle, the defrost control will lock out
the heat pump after the fifth time that the circuit is interrupted by
any pressure switch wired to the control board. In addition,
the diagnostic LEDs will indicate a locked-out pressure switch
after the fifth occurrence of an open pressure switch. See
Defrost Control Board Diagnostic LEDs chart later in this section.
The heat pump will remain locked out until power to the board is
interrupted, then re-established, or until the jumper is applied to
the TEST pins for 0.5 seconds.

NOTE: The defrost control board ignores input from the low
pressure switch terminals during:

TEST mode

Defrost cycle

90-second start-up period

First 90 seconds after the reversing valve switches heat/cool
modes

NOTE: If the TEST pins are jumpered and the 5-minute delay is
being bypassed, the LO PS terminal signal is not ignored during
the 90-second start-up period.

Adjust Defrost System

Defrost Control Board

Optional high pressure switch connections

NOTE: To add the pressure switch, remove the factory-installed
jumper.

Adjust Time Between Defrost Cycles

1. Disconnect power.

Defrost Control Board Diagnostic LEDs

Mode

Green
LED (DS2)

Red LED
(DS1)

No Power to Board

Off

Off

Normal Operation/Power to Board

Simultaneous Slow Flash

Short Cycle Lockout

Alternating Slow Flash

Low Pressure Switch Fault

Off

Slow Flash

Low Pressure Switch Lockout

Off

On

High Pressure Switch Fault

Slow Flash

Off

High Pressure Switch Lockout

On

Off

A. Defrost time setting pins
B. Test pins

C. Compressor delay pins
D. Reversing valve

E. Low pressure switch (optional)

F. Defrost thermostat

G. High pressure switch (optional)

H. Diagnostic LEDs

I. Low voltage terminal strip

connections

K1 Relay

K2 Relay

FAN

DS1

L

24V

P2

P5

O-OUT

DF

Y1-OUT

HI-PS

U1

U2

DS2

K3 Relay

P6

TST PS DF C

R

O Y1

C5

LO-PS

C2

P1

30
60

90

TEST

W1

C

L

R

Y1

O

H

I

A

B

C

D

E

F

G

WARNING

Electrical Shock Hazard

Disconnect power before servicing.

Replace all parts and panels before operating.

Failure to do so can result in death or electrical shock.

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