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12-6. TROUBLE CRITERION OF MAIN PARTS
MVZ-A12AA4
MVZ-A18AA4
MVZ-A24AA4
MVZ-A30AA4
MVZ-A36AA4
Part name
Room temperature
thermistor
(TH1)
Pipe temperature
thermistor/liquid
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Wiring diagram
12-7. Thermistor
<Thermistor Characteristic graph>
Room temperature thermistor (TH1)
Thermistor for
Pipe temperature thermistor (TH2)
lower temperature
Condenser/evaporator temperature
thermistor (TH5)
Thermistor R
= 15 k" ± 3%
0
Fixed number of B = 3480 k" ± 2%
1
Rt = 15exp { 3480(
273+t
0°C (32°F)
15 k"
10°C (50°F)
9.6 k"
20°C (68°F)
6.3 k"
25°C (77°F)
5.2 k"
30°C (86°F)
4.3 k"
40°C (104°F)
3.0 k"
Check method and criterion
Measure the resistance with a tester.
(Part temperature 10°C (50°F) ~ 30°C (86°F))
Normal
4.3kΩ~9.6kΩ
Vm (Power supply for motor)
Vcc (Power supply for control)
Regulator
Vsp (Speed command voltage)
PG (Pulse output for rotation)
GND
1
) }
273
Abnormal
Opened or short-circuited
Motor
Board with build-in motor
Hall IC
Power
device
Current detecting resistor
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0
-4 14 32 50 68 86 104 122
34
Motor winding
Pre
driver
10 20 30 40 50
(˚C)
˚F
Temperature
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