Lennox VRF VMDB Series Installation Instruction page 20

To wired
controller
comm. bus
To wired
controller
power
To outdoor/
indoor/MS
units
comm. bus
CN3 CN18
CN2
CN24
Magnet
N=5
Ring
FM
BLUE
RED
ALARM
Y/G
XT1
L1 L2
POWER IN
Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.
CN4
Setting Blower Operation
Blower cycling can be configured to determine indoor
operation.
• Default operation is indoor unit blower OFF when the
indoor unit is in thermo OFF.
• Settings can be adjusted in the -3P controller and
cannot be configured at the indoor unit PCB.
XT2
WHITE
BLUE
RED
BLACK
YELLOW
GRAY
CN9
CN17
Main Board
EARTH
" +5V GND +12V "
ONLY USED
FOR TESTING
CN14
CN54 CN4 CN26
Y/G
CN1
ON/OFF
Occupancy
SWITCH
sensor
PUMP
Figure 30. Identify T1 Sensor on Wiring Diagram
White plug
Black wire
White wire
Figure 31. Typical Wiring Connections
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
CN30
CN52 CN21 CN12 CN8
HHE interface
CN50
CN51
GM1 GM2
FAN CTON HTON AUXH
(Voltage range:
0-24V AC/DC)
( Current range:
0-1A)
18 AWG stranded shielded cable
Solder or connect with V0SNSR00P
• Consult the specific controller manual for detailed
blower setting information.
NOTE - Ensure the blower is set to the ON position when
using an electrical duct heater.
20
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
EXV Electronic expansion valve
XP1-7
Connectors
XS1-7
XT1-2 Terminals
PUMP Pump motor
CS Water level switch
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
CN5
E4 T2B(Outlet of evaporator sensor) malfunction
E5 T2A(Inlet of evaporator sensor) malfunction
E6 DC fan motor error
EEPROM failure error
E7
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
Black wire
Thermistor