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[ VI Refrigerant Circuit ]
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HWE08040 GB
2. Indoor Unit
Part
Name
Symbol
(functions)
Notes Usage Specification Check method
Linear
expan-
sion valve
LEV 1) Adjusts superheat at the
indoor heat exchanger
outlet during cooling
2) Adjusts subcool at the
heat exchanger outlet of
the indoor unit during
cooling
DC12V
Opening of stepping motor
driving valve 0-(1400) puls-
es
Refer to the section
"Continuity Test with a
Tester".
Continuity between
white, red, and or-
ange.
Continuity between
yellow, brown, and
blue.
Ther-
mistor
TH1
(Suction air
temperature)
Indoor unit control (Thermo)
0°C [32°F]:15kohm
10°C [50°F] :9.7kohm
20°C [68°F]:6.4kohm
25°C [77°F] :5.3kohm
30°C [86°F] :4.3kohm
40°C [104°F] :3.1kohm
Resistance check
TH2
(Pipe temper-
ature)
1) Indoor unit control (Frost
prevention, Hot adjust)
2) LEV control during heat-
ing operation (subcool
detection).
TH3
(Gas pipe
temperature)
LEV control during cooling op-
eration (superheat detection)
TH4
Outdoor air
temperature)
Indoor unit control (Thermo)
Temperature
sensor (In-
door air tem-
perature)
Indoor unit control (Thermo)
Yellow
White
Red
Orange
Brown Blue
M
1
273+t
R
0
=15k
R
0/80
=3460
Rt =
15exp{3460( - )}
1
273