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 close). 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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