Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 141

[ VI Refrigerant Circuit ]
2. Indoor unit
Part Symbols
name (functions)
Linear ex- LEV
pansion
valve
(LEV)
Ther- TH1
mistor (Suction
air tem-
perature)
TH2
(Pipe tem-
perature)
TH3
(Gas pipe
tempera-
ture)
TH4
(Outdoor
tempera-
ture)
Tempera-
ture
sensor
(Indoor
tempera-
ture)
Notes Usage
1. Adjusts superheat at the heat
exchanger outlet of the indoor
unit during cooling
2. Adjusts subcool at the heat
exchanger outlet of the indoor
unit during cooling
Indoor unit control (Thermo)
1. Indoor unit control (Freeze
prevention, Pre-heating
stand-by)
2. LEV control during heating
operation (Subcool detection)
LEV control during cooling oper-
ation (Superheat detection)
Indoor unit control (Thermo)
Indoor unit control (Thermo)
- 132 -
Specifications
DC12V
Opening of a valve driven by
a stepping motor
0-(1400) pulses
R = 15k
0
R = 3460
0/80
1 1
exp
R = 15
3460
t
273
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
Check method
Refer to the sec-
tion " Ⅸ [4] -6-
LEV".
Continuity be-
tween white, red,
and orange.
Continuity be-
tween yellow,
brown, and blue.
White
M
Red
Orange Yellow Brown Blue
Resistance check