Lennox VRF V22B Series Installation Instruction page 11

Outdoor unit Outdoor unit
(sub1 unit)
(main unit)
(H1 H2 )
(PQ)
(PQ)
(PQ)
P Q
Install a terminating resistor (Ω120) on terminals P&Q on the indoor unit
which is furthest from the outdoor unit..
All shields of shielded cable connect to chassis GROUND terminal at MS Boxes and Indoor Units.
18 GA., stranded, 2-conductor, shielded control wire (polarity sensitive).
Typical Wiring Diagram, NEC/CEC and Local Codes apply.
NOTE - Each communication wire from the MS box should follow the refrigerant piping for that port.
Figure 10. Typical Communication Wiring Diagram (VRF Heat Recovery System)
Outdoor unit
(sub2 unit)
K1
(H1 H2 ) (H1 H2 )
(PQ)
MS
Box
K2 O A X
Outdoor Unit Communication Terminal Block
(PQ)
MS
Box
(PQ)
11
Y P Q H1 H2
P
MS Box Communication
Terminal Block
HA HB 12V COM P
Indoor Unit Communication Terminal Block
Ground cable shield
to MS Box
and Indoor Unit chassis
Q
Q