
Section 7 Diagnostics
7-7
Defrost End and Fan Delay
Thermostat (Freezers Only)
FUNCTION
Terminates the defrost cycle, and delays the
start of the evaporator fan(s) after defrost.
SPECIFICATIONS
Model N.C.
Position
N.O.
Position
F1 FR1 30°F
(-1.1°C)
80°F
(26.7°C)
F2 FR2 F3 FR3 30°F
(-1.1°C)
50°F
(10°C)
FS2 FS3 30°F
(-1.1°C)
50°F
(10°C)
FS1
(After 920880000)
35°F
(1.7°C)
55°F
(12.8°C)
FS1
(Before 920880000)
35°F
(1.7°C)
80°F
(26.7°C)
CHECK PROCEDURES
1. Hook a voltmeter across the N.O.
terminals. If, during the defrost cycle, the
bimetal disc does not open when the
evaporator reaches the specified
temperature, replace the thermostat.
2. Hook a voltmeter across the N.C.
terminals. If, after the defrost cycle, the
bimetal disc does not close when the
evaporator coil reaches the specified
temperature, replace the thermostat.
Automatic Defrost Time Clock
(Freezers Only: F1, F2, F3, FS1, FS2, FS3,
FR1, FR2, FR3)
FUNCTION
Initiates the defrost cycle at preset times to
prevent evaporator frost buildup.
CHECK PROCEDURES
1. Inspect the terminals for clean, tight
connections.
2. Verify that correct line voltage is at
terminals X and 3.
Voltage at
Terminals X and 3
Action
Correct
Line Voltage
If 24-hour dial is not
turning, replace
automatic defrost
time clock
None Restore line voltage
3. Hook a voltmeter across the switch
terminals. Verify the readings below. If
you do not get these readings, replace the
defrost timer:
Cycle Terminals Expected Reading
2 and 4 0 volts - closed
Cooling 3 and N 0 volts - closed
3 and 1 Line volts - open
Start of 2 and 4 Line volts - open
Defrost 3 and N Line volts - open
3 and 1 0 volts - closed
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