Whirlpool GC1SHAXM User Manual download pdf (Page 19)

3-5

Defrost is controlled by the main control board,

and incorporates the use of the “pulsed” de

-

frost. However, this defrost system is uniquely

different than other Whirlpool electronic refrig

-

erators.

• Defrost is initiated by a different set of

criteria (listed below).

• The bimetal/thermofuse combination

switches off the defrost heater, and

provides additional defrost circuit pro

-

tection.

• The defrost bimetal is placed on the

neutral side of the defrost heater, and

the thermofuse protects the “line” side

of the circuit.

• The electronic control does not “time-

out” and terminate the defrost cycle.

Defrost is terminated only by the open

-

ing of the bimetal switch contacts, or the

opening of the thermofuse in case the

bimetal fails.

• The bimetal opens at 45

°F ±5° (7°C ±3°)

and closes at 19°F ±5° (–7°C ±3°).

• The thermofuse will open at 162

°F

(72°C).

The defrost cycle is initiated:

• When power is connected (after the

initial power-up) to the refrigerator and

the bimetal is closed (unit is cold).

• With no door openings.

- When 30 hours of compressor run

time, or 50 hours actual time, has

passed since the last defrost cycle.

DEFROST OPERATION

• If a door was opened.

- After 8 hours of cumulative compres

-

sor run time.

• The compressor runs continuously for

at least 8 hours.

The following occurs when the defrost cycle

is initiated:

• Cooling function switches OFF (com-

pressor and both fans are OFF).

• The air-bafﬂe/damper switches to the

CLOSED position.

• The heater starts to heat the evaporator

with the following timing:

- 5 minutes ON, 1 minute OFF.

- 3 minutes ON, 1 minute OFF repeat-

edly.

- Bimetal thermostat opens at 45°F ±5°

(7°C ±3°).

When defrost bimetal thermostat opens:

• The defrost heater is switched OFF.

• The compressor is activated after

7 minutes of drip time.

• The condenser fan is activated 1 minute

after the compressor.

• The evaporator fan is activated after

10 minutes from bimetal opening, or

3 minutes after the compressor starts.

• The air bafﬂe is opened 3 minutes after

the compressor is activated, or a total

time of 10 minutes from the bimetal

opening.

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