Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

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[
VI
Refrigerant Circuit ]
2. Indoor unit
Part
name
Symbols
(functions)
Notes Usage Specifications Check method
Linear ex-
pansion
valve
(LEV) LEV 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
DC12V
Opening of a valve driven by
a stepping motor
0-(2000) pulses Continuity check
with a tester
Continuity be-
tween white, red,
and orange.
Continuity be-
tween yellow,
brown, and blue.
Ther-
mistor TH21
(Suction
air tem-
perature) Indoor unit control (Thermo)
0°C : 15kohm
10°C :9.7kohm
20°C :6.4kohm
25°C :5.3kohm
30°C :4.3kohm
40°C :3.1kohm
Resistance check
TH22
(Pipe tem-
perature) Indoor unit control (Freeze pre-
vention, Pre-heating stand-by)
TH23
(Gas pipe
tempera-
ture) LEV control during cooling oper-
ation (Superheat detection)
TH24
(Dis-
charge air
tempera-
ture) Controls indoor unit discharge
(thermostat)
Float
Switch 33P1 Detects drain pan water level Contact Resistance:
Under 250 mohm
B contact type Continuity check
with a tester
33P2 P500
model
only
Motor MF Sends air PFD-P250VM-E
AC380~415V Type E 4P
Output 3.7kW Rotation number
check
Standard 930rpm
PFD-P500VM-E
AC380~415V Type B 4P
Output 5.5kW Rotation number
check
Standard 978rpm
Yellow
M
Blue Brown
White
Red
Orange
R = 15k
0
R = 3460
R = 15
0/80
t
3460 273 t
1
273
1
exp