152
CONTROL
Outdoor heat
exchanger
vapor tempera-
ture sensor
1. Control of outdoor heat exchanger liquid
flow control valve in heating operation
2. Detection of disconnection or short circuit
in heating operation
Refer to P177 and af-
ter, [Parts Character-
istics].
THG: CN4[17]-[18]
Refrigerant high
pressure switch
1. Judgment to stop the operation at abnor-
mally refrigerant high pressure
2. Detection of disconnection in the refriger-
ant high pressure switch
Rated: 12 V DC
HLSW1, 2※2:
CN30[3]-[4]
Circuit OFF:
551 psi (3.8 MPa)
Circuit ON:
421 psi (2.9 MPa)
Refrigerant high
pressure sensor
1. Refrigerant high pressure control
(target control in heating)
2. Abnormally high refrigerant pressure
avoidance control
3. Abnormally high refrigerant pressure
emergency avoidance control
4. Outdoor fan air volume control
5. Hot gas bypass valve control
6. Detection for inadequate refrigerant
7. Detection for abnormally high refrigerant
pressure
8. Detection of disconnection or short circuit
in the refrigerant high pressure sensor
Rated: 5 V DC
Pressure range:
0 ~ 653 psi
(0 ~ 4.5 MPa)
PSH1:
CN4[33]-[31]-[32]
Refrigerant low
pressure sensor
1. Judgment to stop operation at abnormally
refrigerant low pressure
2. Refrigerant low pressure control in cooling
3. Abnormally low pressure avoidance con-
trol in heating
Rated: 5 V DC
Pressure range:
0 ~ 276 psi
(0 ~ 1.9 MPa)
PSL: CN4[34]-[11]-[12]
Outdoor heat
exchanger
liquid flow
control valve
1. Refrigerant flow volume control in heating
2. Defrost control
Rated: 12 V DC
OEV: CN5[20]-[18]-
[25]-[27]-[21]-[23]
Sub heat
exchanger
liquid flow
control valve
1. Refrigerant flow volume control in heating
2. Low pressure avoidance in cooling opera-
tion
Rated: 12 V DC
SEV: CN5[16]-[14]-[17]-
[19]-[13]-[15]
Subcooling
valve
1. Refrigerant flow volume control in cooling
2. Abnormal intake temperature avoidance
control
Rated: 12 V DC
SCEV: CN5[12]-[10]-
[9]-[11]-[5]-[7]
Oil bypass
control valve
1. To control oil bypass amount suitable for
the refrigerant flow amount
2. Abnormal intake temperature avoidance
control
Rated: 12 V DC
OVEV: CN5[8]-[6]-[1]-
[3]-[4]-[2]
Compressor
clutch
To turn ON/OFF (clutch engaged / disen-
gaged) compressors depending on the
calculated refrigerant flow volume for an
outdoor unit
Rated: 12 V DC CP2: CN8[12]
Name Functions Specifications Connector No.
NOTE) Numbers in [ ] in the "connector No." column correspond with the pin numbers shown in circles in the wiring diagram.
※1. 8 TON only
※2. 15 TON only
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