Wiring Connections - Lennox VRF V33B Series Installation Instruction

Wiring Connections

WARNING
Isolate the power supply before accessing unit electrical
terminals.
Install unit so that unit disconnect is accessible.
Follow all local and national codes, as well as this
installation instruction, during installation. Do NOT
overload electrical circuit, as this may lead to failure and
possible fire.
Use specified wiring and cable to make electrical
connections. Clamp cables securely and make sure that
connections are tight to avoid strain on wiring. Insecure
wiring connections may result in equipment failure and
risk of fire.
Wiring must be installed so that all cover plates can be
securely closed.
In the U.S.A., wiring must conform with current local
codes and the current National Electric Code (NEC). In
Canada, wiring must conform with current local codes and
the current Canadian Electrical Code (CEC).
Refer to unit nameplate for minimum circuit ampacity and
maximum overcurrent protection size.
1. Remove the screws that secure the control box cover.
Remove the cover and place it to the side where it will
not be damaged.
Code
Title
FM Indoor fan motor
T1 Room temp. sensor
Attention:
T2 Midlet pipe temp. sensor
For the convenience of
wiring, the communication
T2A Inlet pipe temp. sensor
terminals can be pulled
out from the main board.
T2B Outlet pipe temp. sensor
XP1-7 Connectors NOTE:
1. Refer to manual for com-
XS1-7 Connectors
munication wiring
2. Please use the 2-conductor
XT1 Terminal
shielded cable
PUMP Pump motor
GM
Swing motor
CS Water level switch
ALARM Warning lamp
EEV Electronic expansion valve
Error code Error Content
E0 Mode conflict
E1 Comm. error with outdoor unit
E2 Temp. sensor (T1) error
E3 Temp. sensor (T2) error
E4 Temp. sensor (T2B) error
Temp. sensor (T2A) error
E5
E6 DC fan error
EEPROM error
E7
Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.
P
Q
COM
12V
HA
HB
Error code Error Content
MS error in auto system-check mode
U4
MS error
F8
Eb EEV error
Outdoor unit error
Ed
Water level alarm
EE
No address when first time power on
FE
A0
Emergency stop
D8 Remote OFF
Figure 9. Typical Wiring Diagram V33B Wiring Diagram
This unit must be properly grounded and protected by a
circuit breaker. The ground wire for the unit must not be
connected to a gas or water pipe, a lightning conductor
or a telephone ground wire.
Do not connect power wires to the outdoor unit until
all other wiring and piping connections have been
completed.
Install all wiring at least 3 feet away from televisions,
radios or other electronic devices in order to avoid the
possibility of interference with the unit operation.
Do not install the unit near a lighting appliance that
includes a ballast. The ballast may affect remote control
operation.
2. Locate the terminal strip in the control box. Connect
the power wiring (sized per NEC/CEC and local
codes) and communications cable (per Figures 10, 11
and 12. Refer to unit nameplate for rated voltage.
Main board
CN11
" +5V GND +12V "
CN12
ONLY USED
FOR TESTING
CN2
CN54
L1 L2
FM
ON/OFF
XT1
ALARM
PUMP
SWITCH
POWER IN
10
CAUTION
CN14
HHE interface
CN50
Occupancy
CN51 CN51
sensor
GM
FAN CTON HTON AUXH
T2A T2 T1
( Current range: 0-1A)
T2B
( Voltage range: 0-24V AC/DC)
XS7
Display board
XP7
GM
EEV CS