Carrier 38VMH072 Series Installation And Maintenance Instructions Manual page 22

outdoor unit
P Q X
L1
MAXIMUM WIRING LENGTH
L1+L3 < 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
NOTE: Network resistor is shipped with the outdoor
unit for field installation on heat pump systems.
LEGEND:
IDU - Indoor Unit
Fig. 35 —Outdoor Unit Communication Port Diagram
Centralized controller
X Y
L5
Y
L3
L3
L3
L3
L3
P
Q
22
NOTE: 24 v. AC Power
Indoor unit 1#
P Q
Indoor unit 2#
P Q
Indoor unit 3#
P Q
Indoor unit 4#
P Q
NOTE: Power from IDU
Indoor unit 5#
P Q
Indoor unit 6#
P Q
Touch screen
wired controller
HA HB
L6
L7
L8
L9
wired controller
HA HB
L10
L11