12.5. Emergency operation
If there is an abnormality in the temperature thermistor (disconnect or shorted), indoor unit cannot be operated.
If abnormality detected in the indoor or outdoor unit, turn off the main power supply and find the cause.
Check the resistance of each thermistor of both indoor and outdoor units by referring the resistance table as follows.
Thermistor resistance table
Resistance value (k
Ω
)±5%
Temperature Indoor Outdoor
(°C) Room
temperature thermistor
Pipe
temperature thermistor
Discharge
temperature thermistor
Pipe
temperature thermistor
-20 158.5 211.3 528.3 47.9
-10 87.5 116.7 291.8 27.1
-5 66.1 88.2 220.5 20.7
0 50.5 67.3 168.3 15.9
5 38.9 51.9 129.8 12.4
10 30.3 40.4 100.9 9.8
15 23.8 31.7 79.2 7.7
20 18.8 25.1 62.7 6.2
25 15 20 50 5
30 12.1 16.1 40.2 4
40 8 10.6 26.5 2.7
50 5.4 7.2 17.9 1.9
60 3.7 5 12.4 1.3
70 - 3.5 8.8 0.9
80 - 2.5 6.3 -
90 - 1.9 4.7 -
100 - 1.4 3.5 -
During outdoor unit emergency operation or test operation, the LED on the P.C.B. will flash.
93
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