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PRECAUTIONS
Precaution for wiring on site
When connecting the indoor unit to a single phase of 3 phase power supply, give consideration to the other
electrical equipment connected to the main breaker and select the phase (L1, L2, L3) so that the current (or
voltage) unbalance does not occur.
If current unbalance occurs, the phase current of the compressor may become unbalanced and there is a risk of
protective device actuating or compressor breakdown.
• Do not clamp remote controller cords together with wires connecting the units. Doing so may cause malfunction.
• Remote controller cords and wires connecting the units should be located at least 50mm from other electric
wires. Not following this guideline may result in malfunction due to electrical noise.
Observe the notes mentioned below when wiring to the power supply terminal block. Precautions to be taken for
power supply wiring.
(Use a round crimp-style terminal for connection to the power supply terminal block. (Fig. 15) In case it cannot be
used due to unavoidable reasons, be sure to observe the following instructions.)
• Do not connect wires of different gauge to the same power supply terminal. (Fig. 16)
(Looseness in the connection may cause overheating.)
• When connecting wires of the same gauge, connect them according to the figure below.
• Make certain that prescribed wires are used, carry out complete connections, and secure the wires so that
outside forces are not applied to the terminals.
Round crimp-style
terminal
CAUTION
• After connecting the wires, be sure that no pressure is applied to the wire connections by using cable ties (field
supplied) and securing them to the anchor points. Also, when wiring, make sure the cover of the terminal box
fits snugly by arranging the wires neatly and attaching the terminal box cover firmly. When attaching the terminal
box cover make sure no wires get caught under the edges. Ensure that all the cables pass under the offset
section of the electrical box cover.
• Make sure the remote control cord, the wiring between the units, and other electrical wiring do not pass through
the same locations outside the unit, separating them by at least 50mm, otherwise electrical noise (external
static) could cause incorrect operation of the unit or damage.
WIRING EXAMPLE for BRC1E63 only
(For the wiring of outdoor units, refer to the installation manual attached to the outdoor unit.)
Confirm the system type.
• Single phase pair type: 1 remote controller controls 1 indoor unit (standard system). (Fig. 17)
• 2 remote controller control: 2 remote controller controls 1 indoor unit. (Fig. 18)
• Group control: 1 remote controller controls up to 16 indoor units (All indoor units operate according to the
remote controller). (Fig. 19)
Ducted Air Conditioners
Electric wire
Fig. 15
Connect wires of
Do not connect
the same gauge to
wires of the same
both sides
gauge to one side
CORRECT
WRONG
Fig. 16
Installation Manual
Do not connect
wires of different
gauges
WRONG
12
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