Carrier 40VMA Series Installation And Maintenance Instructions Manual page 16

outdoor unit
L1
Main MDC unit
L2
MDC unit
Maximum wiring length
L1+L2 < 3937 ft 18AWG, 2-Core Stranded Shield
L3 < 3937 ft 18AWG, 2-Core Stranded Shield
L4 < 3937 ft 18AWG, 2-Core Stranded Shield
L5 < 3937 ft 18AWG, 2-Core Stranded Shield
L6+L7+L8+L9 < 820 ft 18AWG, 2-Core Stranded Shield
L10+L11< 820 ft 18AWG, 2-Core Stranded Shield
Fig. 27 —Typical Heat Recovery System Communication Wiring
Centralized controller
L5
L3
L3
L3
L3
L4
L4
16
wired controller
L6
Indoor unit 1#
Indoor unit 2#
Indoor unit 3#
Indoor unit 4#
wired controller
L10
Indoor unit 5#
Indoor unit 6#
L7
L8
L9
L11