Roper TOP-MOUNT REFRIGERATOR Specifications download pdf (Page 100)

SERVICING THE ADAPTIVE DEFROST CONTROL

STATIC ELECTRICITY DISCHARGE MAY CAUSE DAMAGE

TO THIS ELECTRONIC BOARD.

• Use an anti-static wrist strap. Connect wrist strap to green ground connection

point or unpainted metal in the appliance.

• Touch your finger repeatedly to a green ground connection point or unpainted

metal in the appliance.

• Before removing the part from its package, touch the anti-static bag to a

green ground connection point or unpainted metal in the appliance.

! CAUTION

ADC Test Mode

The refrigerator/freezer defrost system can be checked by manually initiating a defrost cycle. There

are two methods of initiating the ADC Test Mode.

First Test Method:

1. Turn the thermostat off for 15 seconds.

2. Turn the thermostat on for 5 seconds.

3. Turn the thermostat off for 15 seconds.

4. Turn the thermostat on for 5 seconds.

5. Turn the thermostat off for 15 seconds.

6. Turn the thermostat on for 5 seconds.

7. Turn the thermostat off.

In 3 to 8 seconds the ADC should turn on the defrost heater (with the bimetal closed). NOTE: The

test mode will terminate when the bimetal opens.

If the refrigerator/freezer is already in defrost, Test Mode can be terminated by unplugging the

refrigerator/freezer from the wall outlet and waiting 30 seconds before plugging it back in. The

refrigerator/freezer should immediately go into cooling mode if the thermostat is closed.

If this first test procedure fails to make the ADC initiate a defrost cycle, try the following procedure

to make the ADC begin the Test Mode.

Second Test Method:

1. Disconnect the refrigerator/freezer from the wall outlet for at least 30 seconds.

2. Turn the thermostat off.

3. Reconnect power to the refrigerator/freezer.

Within 3 to 8 seconds the ADC should turn on the defrost heater (with the bimetal closed).

If the unit fails to go into the defrost mode during this test, the problem may not be with the ADC. A

defective bimetal may be the cause of the failure. The ADC will only go into a test mode if the

bimetal is closed. If the ADC senses an open bimetal it will return to the cooling mode within 3 to 8

seconds.

HELPFUL HINT: Upon entering the Test Mode, the relay mounted on the ADC board should turn

off the compressor and turn on the defrost heater. Listen for the relay to click.

•If the relay clicks one time when entering the Test Mode, check for continuity in the defrost heater.

•If the relay clicks two times, check for an open bimetal.

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Roper TOP-MOUNT REFRIGERATOR Specifications Page 100