Mitsubishi Electric City Multi CMB-WP108V-G, Service Manual

Page: 95 / 301

[
VI
Refrigerant Circuit ]
- 86 - HWE1113B GB
3. HBC controller
Part name Symbols Notes Usage Specifications Check method
Solenoid
valve SVM1 Refriger-
ant side Opens during the cooling mode
and defrost cycle AC220-240V
Open when energized/
closed when de-energized Continuity check
with a tester
4-way
valve 21S4Ma,b Refriger-
ant side Switches between heating and
cooling AC220-240V
Open when energized/
closed when de-energized Continuity check
with a tester
LEV LEV1 Refriger-
ant side Supplies refrigerant to HEX1a
and HEX1b DC12V
Opening of a valve driven by
a stepping motor
0~3000 pulses Refer to the sec-
tion "Continuity
Test with aTest-
er".
Continuity be-
tween white, red,
and orange.
Continuity be-
tween yellow,
brown, and blue.
LEV2 Refriger-
ant side Supplies refrigerant to HEX2a
and HEX2b
LEV3 Refriger-
ant side Subcool control
Thermistor TH11,12,
T13,14
Refriger-
ant side 1) Compressor frequency con-
trol
2) LEV opening adjustment
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
TH15,16 Bypass superheat amount ad-
justment
TH31a~h Water
side Indoor unit circulating water con-
trol
TH32,33 Indoor unit circulating water con-
trol
TH34,35 Water pump error detection
TH36,37 Water pump suction water tem-
perature detection
Pressure
sensor PS1 Refriger-
ant side 1) Detects high pressure
2) LEV controll
3-way
valve MV1a~h
MV2a~h
*1
Water
side Switches the water flow path de-
pending on the operation mode DC12V
Opening of a valve driven by
a stepping motor
*2
Water flow
rate con-
trol valve FCV3a~h
*1
Water
side Temperature difference control
Controls the water flow to each
indoor unit DC12V
Opening of a valve driven by
a stepping motor
*3
Pump PUMP1,2 Water
side Temperature difference control
Controls the water flow to each
indoor unit Rated voltage DC268V
Specified voltage DC0-6V
Water
pressure
protection
valve CPV1~7 Water
side Trips when the internal pressure
in the water circuit rises Operating pressure: 490
kPa
*1. The names of port "a" through "h" are corresponding to port 1 through 8.
*2. Valve opening is controlled with 0, 800,1600 pulses. In the Maintenance Tool, "0" indicates 0 pulse, "1" indicates 1600
pulses, and "2" indicates 800 pulses.
*3. For the degree of valve opening, "0" indicates fully open and "1600" indicates fully closed.
Yellow
White
Red
Orange
Brown Blue
M
R = 15k
0
R = 3460
R = 15
0/80
t
3460
273 t
1
273
1
exp
Pressure
0~4.15 MPa [601psi]
Vout 0.5~3.5V
0.071V/0.098 MPa [14psi]
Pressure [MPa]
=1.38 x Vout [V]-0.69
Pressure [psi]
=(1.38 x Vout [V] - 0.69) x 145
GND (Black)
Vout (White)
Vcc (DC5V) (Red)
Con-
nector
PS1
1
1 2 3
2
3