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9-6. TROUBLE CRITERION OF MAIN PARTS
Room temperature
thermistor
(TH1)
Condenser/evaporator
temperature thermistor
(TH5)
Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)
Pipe temperature
thermistor/liquid
(TH2)
Wiring diagram
Check method and criterion
Part name
Normal
4.3kΩ~9.6kΩ
Abnormal
Opened or short-circuited
Motor
Board with build-in motor
Current detecting resistor
Regulator Hall IC
Motor winding
Power
device
Pre
driver
Vm (Power supply for motor)
Vcc (Power supply for control)
Vsp (Speed command voltage)
PG (Pulse output for rotation)
GND
9-7. Thermistor
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
< Thermistor for lower temperature >
Temperature (:)
Resistance (K")
<Thermistor Characteristic graph>
Room temperature thermistor (TH1)
Pipe temperature thermistor (TH2)
Condenser/evaporator temperature
thermistor (TH5)
Thermistor R0=15k" ±3%
Fixed number of B=3480k
" ±2%
Rt=15exp { 3480( ) }
0
: 15k"
10: 9.6k"
20: 6.3k"
25: 5.2k"
30: 4.3k"
40: 3.0k"
Thermistor for
lower temperature
1
273+t
1
273
HWE1309A.qx 3/18/14 10:11 AM Page 33