14
Indoor units and MS boxes on the same refrigeration
circuit should have a common power supply but must
have an independent disconnect switch installed adjacent
to the fan coil for servicing and maintenance purposes.
Indoor unit and MS box power supply MUST not be taken
from the outdoor unit. Always follow NEC/CEC and Local
Codes.
Figure 10. Typical Power Wiring Diagram (VRF Heat Recovery System Shown)
L2 L3
L1
L2
L1
208/230V 3Ph 60Hz
or 460V 3Ph 60Hz
Power supply
208/230V 1Ph 60Hz
Power supply
Mode Selection Box
Indoor unit
Indoor unit
Indoor unit
Dedicated
breaker
Service
Disconnect
L1
L2
L1 L2
Fuse
Service
Disconnect
L1 L2
Fuse
Service
Disconnect
L1 L2
Fuse
Service
Disconnect
L1 L2
Fuse
Outdoor Unit (Main Unit)
L1
L2
L3
Outdoor Unit (Sub1 unit)
L1
L2
L3
Outdoor Unit(Sub2 Unit)
L1
L2
L3
L1 L2 L3
L1 L2 L3
L1 L2 L3
L1 L2 L3
L1 L2 L3
L1 L2 L3
Service
Disconnect
Service
Disconnect
Service
Disconnect
IMPORTANT
DO NOT adjust DIP switch settings. Settings may only be
adjusted by a trained technician as part of the commis-
sioning procedures.
