12
P Q
All shields of shielded cable connect to GROUND terminal,
not to terminal E
.
18 GA., stranded, 3-conductor, shielded control wire (polarity sensitive).
Typical Wiring Diagram, NEC/CEC and Local Codes apply.
Outdoor unit
(main unit)
Outdoor unit
(sub1 unit)
Outdoor unit
(sub2 unit)
(PQE)
(H1 H2 E)
(H1 H2 E)
(H1 H2 E)
(PQE)
MS
Box
(PQE)
Ground cable shield
DO NOT connect to E
(PQE)
MS
Box
(PQE)
Install a terminating resistor at the last indoor unit terminals P and Q of the daisy
chain and for each individual unit when connected directly to an MS Box port.
Figure 14. Typical Communication Wiring Diagram (VRF Heat Recovery System)
NOTE - Each communication wire from the MS box should follow the refrigerant piping for that port.
