Principal Parts And Functions - Mitsubishi Electric CMB-WM108V-AA Service Handbook

[ V Refrigerant Circuit ]

[2] Principal Parts and Functions

1. HBC controller
Part name Symbols
Solenoid SV1
valve
4-way 21S4Ma,b
valve
LEV LEV1
LEV2
LEV3
Thermistor TH11,12,
T13,14
TH15,16
TH31a~p
TH32,33
TH34,35
TH36,37
Pressure PS1
sensor (high pres-
sure side)
PS3
(medium
pressure
side)
Valve VB3a~p
block
Pump PUMP1,2
Water CPV1
pressure
protection
valve
*1. The names of port "a" through "p" are corresponding to port 1 through 16.
*2. For the degree of valve opening, "0" or "1600" indicates fully open and "800" indicates fully closed.
HWE1708A
Notes
Refriger- Opens during the cooling mode
ant side and defrost cycle
Refriger- Switches between heating and
ant side cooling
Refriger- Supplies refrigerant to HEX1a
ant side and HEX1b
Refriger- Supplies refrigerant to HEX2a
ant side and HEX2b
Refriger- Subcool control
ant side
Refriger- Compressor frequency control
ant side LEV opening adjustment
Bypass superheat amount ad-
justment
Water Indoor unit circulating water con-
side trol
Indoor unit circulating water con-
trol
Water pump error detection
Water pump suction water tem-
perature detection
Refriger- 1) Detects high pressure
ant side
2) LEV control
1) Detects medium pressure
2) LEV control
*1
Water 1) Switches the water flow
side
path depending on the op-
eration mode
2) Temperature difference
control
Controls the water flow to
each indoor unit
Water Temperature difference control
side Controls the water flow to each
indoor unit
Water Trips when the internal pressure
side in the water circuit rises
Usage
AC220-240V
Open when energized/
closed when de-energized
AC220-240V
Open when energized/
closed when de-energized
DC12V
Opening of a valve driven by
a stepping motor
0~3000 pulses
R
0
R
0/80
R = 15
t
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
Con-
nector
DC12V
Opening of a valve driven by
a stepping motor
Rated voltage DC268V
Specified voltage DC0-6V
Operating pressure: 560
kPa
- 101 -
Specifications Check method
Continuity check
with a tester
Continuity check
with a tester
Refer to the sec-
tion "Continuity
Test with aT-
ester".
Continuity be-
tween white, red,
and orange.
Continuity be-
tween yellow,
brown, and blue.
White
Orange
= 15k
= 3460
1 1
exp
3460
273
Pressure
PS1
0~4.15 MPa [601psi]
Vout 0.5~3.5V
1 2 3
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)
1
2
Vout (White)
3
Vcc (DC5V) (Red)
*2
M
Red
Yellow Brown Blue
GB