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1.
Signal wire is three-core, polarized wire. Use three-core shield wire to prevent interference. The grounding
method now is grounding the closed end of the shield wire and opening (insulating) at the end. Shield is to
be grounded.
2.
The control between outdoor unit and indoor unit is BUS type. Addresses is set on field during the installation.
Indoor/Outdoor unit signal wire is low voltage circuit. Do not let it touch the high voltage power
wire and put it to gather with power cord in the same wire distribution pipe.
CAUTION
The wire diameter and continuous length is under the condition that the voltage vibration is
within 2%. If the continuous length is exceed showing value, choose the wire diameter follow
relevant regulation.
NOTE
• Refrigerant piping system, indoor unit-indoor unit connection signal wires and indoor unit-
outdoor unit connection signal wire are in the same system.
CAUTION
• When power cord is parallel with signal wire, please put them into separate wire distribution
pipes, and leave a proper distance.(Reference distance: It is 300mm when current capacity
of power cord is less than 10A, or 500mm when 50A).
•
Please use shield wire as indoor unit/outdoor unit signal wire. Indoor/Outdoor unit signal wire wiring
21. TEST RUNNING
Operate according to "Method for test running" on the electric control box cover.
• Test running can not start until the outdoor unit has been connected to the power for 12hr.
• Test running can not start until all the valves are affirmed open.
CAUTION
• Never force run
Rinnai
Figure 44. Signal Wiring
Single phase indoor unit
L N
X Y E
Y/G
XT1
Power supply
Please use three-core shielded wire, and
connect the shielded layer to Grounding
Outdoor Unit
Close end of the connection shielded wire
Indoor/Outdoor
Unit Signal Wire
Figure 45. Indoor/Outdoor unit signal wire wiring
P Q
E
XT3
To Outdoor
COMM.BUS
(open)
45
Ducted Reverse Cycle Inverter Installation Manual
INSTALLATION OUTDOOR
Display
board
Wire controller
To wire controller
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