31
12-6. TROUBLE CRITERION OF MAIN PARTS
PVA-A30AA4
PVA-A36AA4
PVA-A42AA4
Room temperature
thermistor
(TH1)
Condenser/evaporator
temperature thermistor
(TH5)
Measure the resistance with a tester.
(Part temperature 10
°
C (50
°
F) ~ 30
°
C (86
°
F))
Pipe temperature
thermistor/liquid
(TH2)
Wiring diagram
Check method and criterion
Part name
Normal
4.3k
Ω
~9.6k
Ω
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
12-7. Thermistor
0
10
20
30
40
50
-20 -10
0
10 20 30 40 50
< Thermistor for lower temperature >
Temperature
Resistance (K
"
)
(
˚C
)
-4
14 32 50 68 86 104 122
˚F
<Thermistor Characteristic graph>
Room temperature thermistor (TH1)
Pipe temperature thermistor (TH2)
Condenser/evaporator temperature
thermistor (TH5)
Thermistor R
0
= 15 k
"
± 3%
Fixed number of B = 3480 k
"
± 2%
Rt = 15exp { 3480( ) }
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
"
Thermistor for
lower temperature
1
273+t
1
273
HWE1406A.qx 3/19/15 9:02 AM Page 31
Summary of Contents for PVA-A30AA4
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