Functions Of The Major Components Of Indoor Unit - Mitsubishi Electric PUHY-HP200YNW-A Service Handbook

[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 tem-
*1
perature)
Temperature
sensor (Indoor
air temperature)
*1. Indicates gas pipe temperature on the PKFY-P VHM-E and PKFY-P VKM-E models.
BS_03_M
Notes Usage
1) Adjusts superheat at the
indoor heat exchanger
outlet during cooling
2) Adjusts subcool at the in-
door unit heat exchanger
outlet during heating
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 1
15exp{3460( - )}
273+t 273
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
Check method
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
7
chapter 3 -