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Defrost Control
Mechanical Defrost Control Removal
1.
Remove the control panel (see the
Control Panel
Removal
section in this Guide).
2.
Disconnect the control panel wire harness.
3.
Disconnect the wiring harness connector from
the defrost control.
4. Press the locking tabs back and slide the defrost
control out of the control panel.
The defrost control switches 120 VAC from the
cold control (
grey
) wire at terminal 3. The purpose
of the defrost control is to regulate the frequency
of defrost cycles and the duration of each cycle.
Defrost time is 15 hours of accumulated compressor
run time. The defrost control stays in defrost for
approximately 33 minutes. The defrost control
provides power to the following:
•
Terminal 1 (
orange
) is neutral for the timer
motor.
•
Terminal 2 (
blue
) 120 VAC to defrost cycle.
•
Terminal 3 (
brown
) 120 VAC to timer (from cold
control)
•
Terminal 4 (
black
) 120 VAC cooling cycle
operation
Defrost Controls
Electronic Defrost Control (EDC) Board
Removal
1.
Remove the control panel (see the
Control Panel
Removal
section in this Guide).
2.
Disconnect the control panel wire harness.
3. Remove the two push pins.
4.
Remove the cover and flip the control over.
5.
Disconnect the EDC wiring and remove EDC
board from the control panel.
The EDC board receives 120 VAC through
brown
at
L1. The EDC controls the following:
1. 120 VAC Line voltage to the cold control through
the K2 relay, L1 (
brown
) to CC (
gray
).
2.
Defrost heater operation through the K2 relay,
L1 (
brown
) to DF (
blue
).
The EDC receives input from the following:
1.
Compressor run time through CR (
black
)
2.
Fresh Food door openings through FF (
red
)
3.
Defrost Heater time through DT (
pink
)
NOTE
: Freezer is not monitored, as there is no
freezer door switch on top mount freezers at this
time.
