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The EDC processes
:
1. The amount of time the compressor has run.
2. The number of times the fresh food door was open.
3. The length of time the defrost heater was on.
During the defrost mode, the electronic control monitors the defrost heater operation (heater ON time). Once
the heater operation is terminated by the Defrost Thermostat, the electronic control will allow a DWELL TIME
before initiating the next cooling cycle. Dwell time is the elapsed time from the heater termination until the
cooling operation is resumed (approximately 15 minutes). If the Defrost Heater remains on more than 25
minutes (or a maximum of 40 minutes), the EDC board will go directly into the cooling mode and bypass the
DWELL TIME MODE. This cycle would be considered an Abnormal Defrost.
During the cooling operation, the electronic control monitors door opening times and compressor run times.
These times are measured in seconds (1 second of door opening = 286 seconds) and are accumulated until
they add up to 80 hours of total equivalent compressor run time. One door opening at 1 second X 286, is
equivalent to 4 minutes 46 seconds of compressor run time.
Once 80 hours (4600 minutes) of total equivalent compressor run time is reached, the refrigerator will enter
the Defrost Mode. The total equivalent compressor run time is calculated by multiplying the accumulated
amount of time the Fresh Food door was open since the last defrost cycle by a multiplication factor, then
adding to that number the actual amount of time the compressor has been running since the last defrost
cycle.
The MULTIPLICATION FACTOR of 286 seconds is used to compute an equivalent compressor run time for each
time the refrigerator (Fresh Food door) door is open. For example, with a multiplication factor of 286 and a
door open 10 times for one second each time, 2860 seconds of equivalent compressor run time is noted,
(286 X 10).
NOTE
: To get door opening seconds to minutes, divide the total number of door opening seconds
by 60 (60 seconds = 1 minute). Example: 10 x 286 = 2860 seconds, 2860 / 60 = 47 minutes.
EDC Board Diagnostics
Initiating Diagnostic Defrost
To initiate manual defrost, open the fresh food door, then press the door switch located on the control
panel three (3) times within five (5) seconds and close the fresh food door. Pressing this switch in this way
will initiate an immediate defrost unless the control is already in the Defrost or Dwell states. After defrost
is initiated, the normal defrost sequence will follow and the normal rules will determine the start of the
next defrost.
NOTE
: If the refrigerator has been unplugged, wait 45 seconds before initiating the defrost
diagnostic.
Terminate Diagnostic Defrost
To terminate defrost, with the fresh food door open press the door switch three (3) times within five (5)
seconds when the control is in either the Defrost or Dwell states. Pressing this switch in this way will
terminate the defrost and initiate a first cycle state (time starts at 0).
Electronic Defrost Control (EDC)
Accumulated door open
time (door openings)
Multiplication
factor of
286 seconds
Accumulated
compressor
run time (minutes)
Total equivalent
compressor
run time (minutes)
(
)
X
+
=
