20
Figure 18. VVCB Typical Wiring Diagram
NOTE - Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.
XS1-6
XP1-6
T2B
XT1-2
ALARM
EEV
Indoor fan motor
Terminals
Electronic expansion valve
Room temperature sensor
Inlet of evaporator sensor
Outlet of evaporator sensor
Water level switch
Warning lamp
Pump motor
Connectors
Title
Code
Title
Code
FM
CS
T2A
T1
PUMP
EEV
CN28
T2B
T1
T2A
XS4
XP4
BLUE
WHITE
RED
Main Board
XS6
XP6
ON/OFF
SWITCH
ALARM
PUMP
CN50
HHE interface
CN51
CN51
FAN CTON HTON AUXH
( Current range: 0-1A)
( Voltage range: 0-24V AC/DC)
RED
BLACK
XS5
XP5
XT1
BLACK
RED
Y/G
CN27
CN3 CN18
CN31 CN54
CN4
CN15
CN19
CN8
CN12
CN26
CN25
CN21
CN14
CN52
CN9
L1 L2
POWER IN
Heat
“ +5V GND +12V ”
ONLY USED
FOR TESTING
T2
BLACK
XP1
XP2
XP3
1S
X
2S
X
3S
X
T2
Middle of evaporator Sensor
YELLOW
GRAY
WHITE
BLUE
RED
BLACK
CN17
CN30
To wired
controller
comm. bus
To outdoor/
indoor/MS
units
comm
.
bus
XT2
HA
HB
12V
COM
Q
P
To wired
controller
power
EARTH
Display Board
CN5
CS
Error code
Error Content
E0
E1
E2
E4
E5
Mode conflict
Communication error between indoor and main outdoor unit
T1(Room temperature sensor) malfunction
T2B (Outlet of evaporator sensor) malfunction
T2A (Inlet of evaporator sensor) malfunction
Error Content
Error code
FE
Eb
U4
Ed
EE
F8
No address
EEV malfunction
MS self-inspection error
Outdoor unit fault
High water alarm
MS error
E6
DC fan motor error
E7
EEPROM failure
E3
T2(Middle of evaporator sensor) malfunction
D8
A0
Remote off
Emergency stop
NOTE:
1. Refer to manual for communication
wiring
2. Please use the 2-conductor shielded
twisted cable for communication
NOTE:
Component in dash line is optional or
field wiring
Y/G
Occupancy
sensor
CN1
P1
P2
