Transition Wiring For Wired Controller - Hitachi RPC-2.0FSR Installation & Maintenance Manual

7.4 Transition Wiring for Wired Controller
In the twin, triple, and quad combination of indoor units, the transition wiring for the wired controller is not
required. However, when connecting indoor units without transition wiring for wired controller, the followings
are limited.
(1) The following functions are available to set only to
the main unit with the wired controller PC-ARF1.
* "Remote ON/OFF function, 1 and 2"
* "Power supply ON/OFF function, 1 and 2"
* "Prohibiting operation by wired controller"
(2) The following connection is NOT available.
(a) Connection between Main Units without Transition Wiring
When the indoor units in multiple refrigerant cycles are controlled by one wired controller, all the
indoor units are required to be connected with the transition wirings.
Main Sub Sub
Incorrect
(b) Connection between Main Unit without Transition Wiring and Unit with Transition Wiring
When the indoor units in multiple refrigerant cycles are controlled by one wired controller, all the
indoor units are required to be connected with the transition wirings.
Main Sub
Incorrect
(c) Connecting Wired Controller to Sub unit without Transition Wiring
When the indoor units are controlled by 2 wired controllers, the sub wired controller shall be
connected to the main unit.
Main
Incorrect
32
Main Sub
Main Sub
Sub
Power Source Wiring
Transition wiring is unnecessary.
Wired
Controller
(PC-ARF1)
Main Sub Sub
Correct
Main Sub
Correct
Main
Correct
Main Sub
Main Sub
Sub
A10762300A-rev.1