Service Manual

11. Electrial checks of main parts
446
SMGB0079 rev.0 - 01/2013
4 If compressor upper part temperature increases excessively the protection control is activated and the compressor is
stopped according to the following method.
Operation Upper part temperature of compressor Defecting period
Cooling
Over 132 ºC 10 minutes (continuously)
Over 140 ºC 5 seconds (continuously)
Heating
Over 132 ºC 10 minutes (continuously)
Over 140 ºC 5 seconds (continuously)
Defrosting Over 132 ºC 5 seconds (continuously)
Thermistor for outdoor ambient temperature
The thermistor resistance characteristics are shown in the gure below.
Thermistor for evaporating temperature of outdoor unit in heating operation (for defrosting)
The characteristics for the thermistor is the same with the value of outdoor ambient temperature thermistor as shown in
the gure below.
90
80
70
60
50
40
30
20
10
0
-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60
74
43
33
26
20
16
12.5
10
8
5.3
3.6
2.5
56
Thermistor
Resistance
(kΩ)
Ambient and Evaporating Temp. Thermistor Characteristics
for Outdoor Unit
Ambient Temperature (
o
C)