6
Figure 2. Connect Controller to Multiple Indoor Units Wiring Connections
Connecting to Multiple Indoor Units
Connect the controller to multiple indoor units, up to 16. Use 4-conductor shielded cable to connect
to the rst 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.
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
HB
HA
COM
12V
HB
HA
COM
12V
HB
HA
COM
12V
HB
HA
CAUTION
Connect “12V” on the controller to
terminal “12V” on the rst indoor unit
only. 12V connection provides power to
controller; connection to multiple indoor
units will damage controller and indoor
unit boards.
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