AUU12RLF Installation Manual

En-11
7. ELECTRICAL WIRING
WARNING
Before starting work, check that power is not being
supplied to the indoor unit and outdoor unit.
Match the terminal board numbers and connection cord
colors with those of outdoor unit or branch box unit.
Erroneous wiring may cause burning of the electric parts.
Connect the connection cords rmly to the terminal board.
Imperfect installation may cause a re.
Always fasten the outside covering of the connection
cord with the cable clip. (If the insulator is chafed, electric
leakage may occur.)
Always connect the ground wire.
(1) Use ring terminals with insulating sleeves as shown in the
 gure below to connect to the terminal block.
(2) Securely clamp the ring terminals to the wires using an
appropriate tool so that the wires do not come loose.
(3) Use the speci ed wires, connect them securely, and fasten
them so that there is no stress placed on the terminals.
(4) Use an appropriate screwdriver to tighten the terminal
screws. Do not use a screwdriver that is too small, other-
wise, the screw heads may be damaged and prevent the
screws from being properly tightened.
(5) Do not tighten the terminal screws too much, otherwise,
the screws may break.
(6) See the table 1 for the terminal screw tightening torques.
Strip 10 mm (13/32")
Sleeve
Ring terminal
Screw with
special washer
Screw with
special washer
Ring terminal
Ring
terminal
Wire
Wire
Terminal block
Terminal
board
Table 1
Tightening torque
M4 screw 1.2 to 1.8 N·m (11 to 16 lbf·in)
WARNING
Use crimp-type terminals and tighten the terminal screws
to the speci ed torques, otherwise, abnormal overheating
may be produced and possibly cause heavy damage
inside the unit.
7.1. Wiring system diagram
Connection cable to outdoor unit or BRANCH BOX
Wired remote controller cable
Control line
Power line
Red
White
Black
Indoor
unit side
INDOOR UNIT SIDE
INDOOR
UNIT
OUTDOOR UNIT
or BRANCH BOX
TERMINAL
DISCONNECT
SWITCH
(Field supply)
Grounding
line
14AWG
(Inter-unit)
Power lines
208/230 V
208/230 V
208/230 V
Remote controller line
Disconnect Switch - Field supplied if required by local code.
Select the correct capacity of disconnect switch according
to the load.
CAUTION
Tighten the indoor unit connection cable and power
supply indoor and outdoor unit, branch box termi-
nal board connections  rmly with the terminal board
screws. Faulty connection may cause a  re.
If the indoor unit connection cable and power supply
are wired incorrectly, the air conditioner may be dam-
aged.
Connect the indoor unit connection cable by match-
ing the numbers of the outdoor, branch box and indoor
units terminal board numbers as shown in terminal
label.
Ground both the indoor and outdoor, branch box units
by attaching a ground cable.
Unit shall be grounded in compliance with the applica-
ble local and national cables.
WARNING
Disconnect switch for over current protection given
in the system diagram is to be installed between the
indoor unit and the outdoor unit, branch box.