Technical Data Manual

Design of 3WAY VRF SYSTEM
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3. Electrical Wiring
(1)
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)
When linking outdoor units in a network, disconnect the terminal extended from the short plug (CN003, 2P Black,
Do not install the inter-unit control wiring in a way that forms a loop. (Fig. 2-1)
Outdoor unit Outdoor unit Outdoor unit
Prohibited
Prohibited
Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit
Fig. 2-1
(3) Do not install inter-unit control wiring such as star branch wiring. Star branch wiring causes mis-address setting.
(Fig. 2-2)
Outdoor unit Indoor unit Indoor unit
Indoor unit Indoor unit
NO
Branch point
Fig. 2-2
(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)
Outdoor unit Outdoor unit Outdoor unit
Indoor unit Indoor unit Indoor unit Indoor unit
Indoor unit
more than 3.3 ft.
more than 3.3 ft.
Branch
point
16 or fewer
Indoor unit
Indoor unit Indoor unit Indoor unit
less than 3.3 ft.
Indoor unit
Fig. 2-3
CAUTION
TD831158-02_3WAY_VRF_SYS.indb 26TD831158-02_3WAY_VRF_SYS.indb 26 2013/06/18 11:46:382013/06/18 11:46:38