14
Fig. 25 —Typical Heat Recovery System Communication Wiring
Main MDC unit
MDC unit
outdoor unit
Centralized controller
wired controller
L1
L2
L3
L3
L3
L3
L4
L4
L5
L6
L10
Indoor unit 1#
Indoor unit 2#
L10
Indoor unit 3#
Indoor unit 4#
Indoor unit 5#
Indoor unit 6#
L6
L6
L6
wired controller
MAXIMUM WIRING LENGTH
CN51
CN50
ACB interface
FAN CTONHTON AUXH
CN54
OFF GND
3GOTHUGXJ
Outside Air Unit
Reheat unit
L11
wired controller
wired controller
wired controller
wired controller
L1+L2 < 3937 ft 18 AWG, 2-Core Stranded Shield
L3 < 3937 ft 18 AWG, 2-Core Stranded Shield
L4 < 3937 ft 18 AWG, 2-Core Stranded Shield
L5 < 3937 ft 18 AWG, 2-Core Stranded Shield
L6+L7+L8+L9 < 820 ft 18 AWG, 2-Core Stranded Shield
L10+L11 < 820 ft 18 AWG, 2-Core Stranded Shield