10
PQE Communication wiring
L1/L2/L3 Three-Phase power wiring
Electrical disconnect switch
Legend
Power Distribution Box
L1/L2/L3
MS
Box
MS
Box
L1/L2
L1/L2
L1/L2
L1/L2
L1/L2
L1/L2
L1/L2
PQE
PQE
PQE
PQE
L1/L2
L1/L2
L1/L2
L1/L2
PQE
PQE
PQE
PQE
PQE
L1/L2/L3
L1/L2/L3
L1/L2
L1/L2 Single-Phase power wiring
PQE
PQE
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)
