Mitsubishi Electric CITY MULTI CMB-WP1016V-GA1, Service Handbook

Page: 73 / 294

[
V
Refrigerant Circuit ]
- 64 -
HWE1410A GB
[2] Principal Parts and Functions
1. 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
Compressor frequency control
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~p 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
(high pres-
sure side)
Refriger-
ant side
1) Detects high pressure
2) LEV control
PS3
(medium
pressure
side)
1) Detects medium pressure
2) LEV control
Valve
block
VB3a~p
*1
Water
side
1) Switches the water flow
path depending on the op-
eration mode
2) Temperature difference
control
Controls the water flow to
each indoor unit
DC12V
Opening of a valve driven by
a stepping motor
*2
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 Water
side
Trips when the internal pressure
in the water circuit rises
Operating pressure: 560
kPa
*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.
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
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