Lennox VRF VMDB Series Installation Instruction page 18

To wired
controller
comm. bus
To wired
controller
power
To outdoor/
indoor/MS
units
comm. bus
EARTH
CN3 CN18
CN2
CN24
Magnet
N=5
Ring
FM
BLUE
RED
ALARM
Y/G
XT1
L1 L2
PUMP
POWER IN
Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.
XT2
WHITE
BLUE
RED
BLACK
YELLOW
GRAY
CN9
CN17
Main Board
CN30
" +5V GND +12V "
ONLY USED
FOR TESTING
CN14
CN54 CN4 CN26
Y/G
CN1
ON/OFF
Occupancy
SWITCH
sensor
Figure 24. Wiring Diagram - VMDB007-048-P3 Wiring Diagram
NOTE:
NOTE:
1. Refer to manual for communication
Component in dash line is
wiring optional or field wiring
2. Please use the 2-conductor shielded
twisted cable for communication
Display Board
XP5 XS5
CN15
CN5
CN52 CN21 CN12 CN8
HHE interface
CN50
CN51
GM2
GM1
FAN CTON HTON AUXH
(Voltage range:
0-24V AC/DC)
( Current range:
0-1A)
18
Title
Code
FM Indoor fan motor
Room temperature sensor
T1
Inlet of evaporator sensor
T2A
Outlet of evaporator sensor
T2B
T2 Middle of evaporator sensor
Warning lamp
ALARM
Electronic expansion valve
EXV
XP1-7
Connectors
XS1-7
XT1-2 Terminals
PUMP Pump motor
Water level switch
CS
GM1-2 Swing motors
Error Content
Error Code
E0 Mode conflict
Communication error between
E1
indoor and main outdoor unit
E2 T1(Room temperature sensor) malfunction
T2(Middle of evaporator sensor) malfunction
E3
E4 T2B(Outlet of evaporator sensor) malfunction
E5 T2A(Inlet of evaporator sensor) malfunction
E6 DC fan motor error
E7 EEPROM failure error
MS self-inspection error
U4
MS error
F8
EXV malfunction
Eb
EXV
Ed Outdoor unit fault
EE Water level alarm
FE No address
Emergency stop
A0
CS
Remote OFF
D8