Hitachi RAC-25FPA RAC25FPA 사용자 설명서
제품 코드
RAC25FPA
14-41
14.10 THERMISTOR
14.10.1 NAME AND ROLE OF EACH THERMISTOR
Name
Connector no.
Measuring point
role
OH thermistor
CN5
Compressor head
If the temperature of the compressor rises
abnormally (118
abnormally (118
o
C), the compressor will be
stopped. The temperature is used to decide
the operation of the valve
the operation of the valve
DEF thermistor
CN6
Heat exchanger
The thermistor decide the defrost operation
during heating combine the data of the
outside temperature and its data
during heating combine the data of the
outside temperature and its data
Outdoor temperature
thermistor
thermistor
CN7
Outside temperature
Outdoor temperature is used to decide the
various operation of the air conditioner
various operation of the air conditioner
Electrical Expansion valve
thermistor (narrow pipe 1)
thermistor (narrow pipe 1)
CN8
Indoor unit (narrow pipe 1)
The thermistors detect the temperature of the
piping to the indoor units. The temperature
are used to decide how much the expansion
valve is opened
piping to the indoor units. The temperature
are used to decide how much the expansion
valve is opened
Electrical Expansion valve
thermistor (narrow pipe 2)
thermistor (narrow pipe 2)
Indoor unit (narrow pipe 2)
Electrical Expansion valve
thermistor (narrow pipe 3) *
thermistor (narrow pipe 3) *
Indoor unit (narrow pipe 3)
Electrical Expansion valve
thermistor (narrow pipe 4) *
thermistor (narrow pipe 4) *
Indoor unit (narrow pipe 4)
Electrical Expansion valve
thermistor (wide pipe 1)
thermistor (wide pipe 1)
CN9
Indoor unit (wide pipe 1)
Electrical Expansion valve
thermistor (wide pipe 2)
thermistor (wide pipe 2)
Indoor unit (wide pipe 2)
Electrical Expansion valve
thermistor (wide pipe 3) *
thermistor (wide pipe 3) *
Indoor unit (wide pipe 3)
Electrical Expansion valve
thermistor (wide pipe 4) *
thermistor (wide pipe 4) *
Indoor unit (wide pipe 4)
“*” Starmark is applicable to respective models only
14.10.2 REFERENCE VALUE FOR THERMISTOR’S RESISTANCE AND TEMPERATURE
Electrical expansion
valve thermistor
valve thermistor
Temperature
Resistance
Microcomputer
pin potential
pin potential
DEF thermistor
-15
o
C
12.6k
Ω
1.0V
0
o
C
6.1 k
Ω
1.7V
25
o
C
2.2 k
Ω
3.0V
50
o
C
860
Ω
3.9V
75
o
C
400
Ω
4.4V
Outdoor temperature
thermistor
thermistor
-15
o
C
12.6k
Ω
1.0V
0
o
C
6.1 k
Ω
1.7V
15
o
C
3.2 k
Ω
2.4V
30
o
C
2 k
Ω
3.1V
OH thermistor
25
o
C
33.9 k
Ω
0.5V
50
o
C
10.8 k
Ω
1.3V
75
o
C
4.1 k
Ω
2.4V
100
o
C
1.7 k
Ω
3.4V
105
o
C
1.5 k
Ω
3.6V
118
o
C
1 k
Ω
3.9V
NOTE:
The table shows the corresponding reference value between thermistor’s resistance and the temperature. The value stated in the
table might be slightly differ from measured value, depending on the measuring instrument.
When measuring the resistance, pull out the connector after turning off the power supply to avoid voltage leak.
WARNING:
Pulling out the connector while the power supply is turn on will cause electrical shock, leak of current or burn of measuring
instrument.
Pulling out the connector while the power supply is turn on will cause electrical shock, leak of current or burn of measuring
instrument.