Thermistor Temperature Sensors - Fisher & Paykel 635 Active Smart Service Manual

4.22

Thermistor Temperature Sensors

These sensors are used to monitor temperatures within the refrigerator. They are:
1. A defrost sensor mounted above the evaporator used to measure the temperature when in defrost.
2. An FC sensor mounted on the evaporator coil cover used to measure the temperature in FC.
3. A PC sensor mounted in the PC on the duct cover and used to sense the PC temperature.
4. On ice & water models, an ice tray sensor mounted on the bottom of the ice cube tray used to
measure the temperature of the ice tray.
5. On ice & water models, a water tank sensor mounted at the rear of the water tank used to measure
the temperature of the water tank.
Thermistor sensors are used for temperature measurement. Their electrical resistance changes as the
temperature changes. The table below lists some typical resistance values. The temperature can be read
using Diagnostic Mode as described in the Section 10.1.5 (ice & water models) or Section 10.2.3 (non-ice &
water models).
TEMPERATURE (°C)
THERMISTOR SENSOR RESISTANCE TABLE
-30.0
-25.0
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
RESISTANCE
(K Ohms ±5%)
25.17
19.43
15.13
11.88
9.392
7.481
6.000
4.844
3.935
3.217
2.644
2.186
1.817
1.518
1.274
1.075
0.9106
Diagram 4.22
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