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[3-4 Functions of the Major Components of Indoor Unit ]
3-4
Functions of the Major Components of Indoor Unit
Part
Symbol
Name
(functions)
Linear
LEV
expan-
sion valve
Thermis-
TH1
tor
(Suction air tem-
perature)
TH2
(Pipe tempera-
ture)
TH3
(Gas pipe tem-
perature)
TH4
(Outdoor air
temperature)
Temperature
sensor (Indoor
air temperature)
HWE13080
Notes
Usage
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
Indoor unit control (Thermo)
1) Indoor unit control (Frost
prevention, Hot adjust)
2) LEV control during heat-
ing operation (subcool
detection).
LEV control during cooling op-
eration (superheat detection)
Indoor unit control (Thermo)
Indoor unit control (Thermo)
Specification
DC12V
Opening of stepping motor
driving valve 0-(1800) pulses
R
=15k
0
R
=3460
0/80
Rt =
1
15exp{3460(
273+t
0°C [32°F]:15 kΩ
10°C [50°F] :9.7 kΩ
20°C [68°F]:6.4 kΩ
25°C [77°F] :5.3 kΩ
30°C [86°F] :4.3 kΩ
40°C [104°F] :3.1 kΩ
- 72 -
Check method
Refer to the section
"Continuity Test with a
Tester".
Continuity between
white, red, and or-
ange.
Continuity between
yellow, brown, and
blue.
White
M
Red
Orange
Yellow
Brown Blue
Resistance check
1
-
)}
273
GB
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