517672
6
2.6
Thermistor Sensor Resistance Table
Temperature (
º
C)
Resistance
(K
Ω
±
5%)
-30.0
25.17
-25.0
19.43
-20.0
15.13
-15.0
11.88
-10.0
9.392
-5.0
7.481
0.0
6.000
5.0
4.844
10.0
3.935
15.0
3.217
20.0
2.644
25.0
2.186
30.0
1.817
35.0
1.518
40.0
1.274
45.0
1.075
50.0
0.9106
2.7
Defrost Element
The 230 volt 109 watt defrost element is located under the evaporator.
2.8
Thermal Fuses
Two thermal fuses are wired in series to the defrost element and located on the left hand top side
of the evaporator. To access the thermal fuses, the fan cover has to be removed.
2.9
Defrost Cycle
The defrost heater is controlled by the control module, which switches it via a relay. The defrost
interval can vary from between 8 hours and 16 hours of compressor run time, depending on the
duration time of the last defrost.
When the control module switches the compressor off for the defrost, there is a 2 minute delay
before the defrost heater is turned on. The defrost is terminated when the defrost sensor reaches
8º C. At the conclusion of the defrost there is a 4 minute delay after the defrost element has been
turned off before the compressor is turned on.
Defrost Cycle
Compressor switches off
Defrost element switches off at 8º C
Defrost element
Compressor switches
Switches off
back on
2 minute
4 minute
delay
delay
30 minute maximum defrost time
Normal Run
Warm up
Defrost Cycle
Drip Time
Normal Run
Time
