Connecting To Multiple Indoor Units - Lennox V0STAT51P-3 Installation & Operation Instructions

Connecting to Multiple Indoor Units

Connect the controller to multiple indoor units, up to 16. Use 4-conductor shielded cable to connect
to the first indoor unit, then daisy chain control wiring to each indoor unit using the HA/HB terminals
in the electrical control box of the indoor unit. Do not daisy chain 12V power cable. See Figure 2.
NOTE All of the indoor units connected to the controller must be on the same refrigerant circuit,
–
connected to the same outdoor unit.
HB COM 12V
HA
HB COM 12V
HA
Figure 2. Connect Controller to Multiple Indoor Units Wiring Connections
CAUTION
Connect "12V" on the controller to
terminal "12V" on the first indoor unit
only. 12V connection provides power to
controller; connection to multiple indoor
units will damage controller and indoor
unit boards.
HB
HA
NOTES - 1. Connect "+12V" on the controller to terminal "+12V" on the first indoor
unit only. 12V connection provides power to controller; connection to
multiple indoor units will damage controller and indoor unit boards.
2. Ground cable shielding at each indoor unit.
4. Use stranded, shielded, 18 GA cable.
5. Connect up to 16 indoor units.
COM 12V
6
HB COM 12V
HA