Mitsubishi PUHY-EP250 - Functions of the Major Components of Indoor Unit

[3-4 Functions of the Major Components of Indoor Unit ]
- 60 -
HWE12050 GB
3-4 Functions of the Major Components of 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-(1800) pulses
Refer to the section
"Continuity Test with a
Tester".
Continuity between
white, red, and or-
ange.
Continuity between
yellow, brown, and
blue.
Thermis-
tor
TH1
(Suction air tem-
perature)
Indoor unit control (Thermo)
0°C [32°F]:15 k
10°C [50°F] :9.7 k
20°C [68°F]:6.4 k
25°C [77°F] :5.3 k
30°C [86°F] :4.3 k
40°C [104°F] :3.1 k
Resistance check
TH2
(Pipe tempera-
ture)
1) Indoor unit control (Frost
prevention, Hot adjust)
2) LEV control during heat-
ing operation (subcool
detection).
TH3
(Gas pipe tem-
perature)
LEV control during cooling op-
eration (superheat detection)
TH4
Outdoor air tem-
perature)
*1
Indoor unit control (Thermo)
Temperature
sensor (Indoor
air temperature)
Indoor unit control (Thermo)
*1. Indicates gas pipe temperature on the PKFY-P VHM-E and PKFY-P VKM-E models.
Yellow
White
Red
Orange
Brown Blue
M
1
273+t
R 0 =15k
R
0/80 =3460
Rt =
15exp{3460( - )}
1
273