Panasonic U-72MF1U9 Technical Data Manual page 40

3. Electrical Wiring
CAUTION
(1) When linking outdoor units in a network, disconnect the terminal extended from the short plug (CN003, 2P Black,
location: right bottom on the outdoor main control PCB) from all outdoor units except any one of the outdoor units.
(When shipping: In shorted condition.)
For a system without link (no connection wiring between outdoor units), do not remove the short plug.
(2) Do not install the inter-unit control wiring in a way that forms a loop. (Fig. 2-1)
Outdoor unit
Indoor unit
1
(3) Do not install inter-unit control wiring such as star branch wiring. Star branch wiring causes mis-address setting.
(Fig. 2-2)
2
3
(4) If branching the inter-unit control wiring, the number of branch points should be 16 or fewer.
(Branches less than 3.3 ft. are not included in the total branch number.) (Fig. 2-3)
4
5
Branch
point
16 or fewer
6
7
8
Outdoor unit
Indoor unit Indoor unit
Outdoor unit Indoor unit
NO
Indoor unit
Outdoor unit
Indoor unit Indoor unit
more than 3.3 ft.
Indoor unit Indoor unit
more than 3.3 ft.
Indoor unit
less than 3.3 ft.
Indoor unit
Outdoor unit
Prohibited
Indoor unit
Fig. 2-1
Indoor unit
Indoor unit
Branch point
Fig. 2-2
Outdoor unit
Indoor unit
Indoor unit
Fig. 2-3
2 - 26
Design of 3WAY VRF SYSTEM
Prohibited
Indoor unit
Outdoor unit
Indoor unit
Indoor unit