Installation Manual

En-8
7. ELECTRICAL WIRING
]1
7.1. Wiring system diagram
INDOOR UNIT SIDE
INDOOR UNIT
TERMINAL
DISCONNECT
SWITCH
(FIELD SUPPLY)
208/230 V
208/230 V
208/230 V
Grounding line
14AWG
(Inter-unit)
Power lines
OUTDOOR UNIT
or BRANCH BOX
Please connect
it to the specifi ed
terminal.
Disconnect switch - fi eld supplied if required by local code. Select
the correct capacity of disconnect switch according to the load.
• To connect the indoor unit wires to the terminal correctly,
refer to the fi gure for proper length.
14AWG
Earth wire
175 mm
(6-7/8 in.)
190 mm
(7-15/32 in.)
25 mm
(31/32 in.)
25 mm
(31/32 in.)
Conduit holder
Conduit connector
CAUTION
Every wire must be connected fi rmly.
No wire should be allowed to touch refrigerant tubing,
the compressor or any moving part.
Loose wiring may cause the terminal to overheat or
result in unit malfunction. A fi re hazard may also exist.
Therefore, be sure all wiring is tightly connected.
Connect wires to the matching numbers of terminals.
CAUTION
• Connect the piping so that the control box cover can
easily be removed for servicing when necessary.
• In order to prevent water from leaking into the control box,
make sure that the piping is well insulated.
• When single type installation, the ADAPTER included out-
door unit is necessary to connect the indoor unit to the out-
door unit.
SINGLE TYPE INSTALLATION
MODEL
ADAPTER
Liquid pipe Gas pipe
18,000BTU/h model Use Use
24,000BTU/h model Use No use
MULTI TYPE INSTALLATION
MODEL
ADAPTER
Liquid pipe Gas pipe
18,000BTU/h model No use No use
24,000BTU/h model No use No use
When the fl are nut is tightened properly by your hand, hold the
body side coupling with a wrench, then tighten with a torque
wrench. (See the table below for the fl are nut tightening torques
and adapter tightening torque.)
Torque wrench
Connection pipe
Flare nut
Holding wrench
Tighten with two wrenches.
Indoor unit pipe
(Body side)
Flare nut tightening torque
Flare nut [mm (in.)] Tightening torque [N·m (lbf·ft)]
6.35 (1/4) dia. 16 to 18 (11.8 to 13.3)
9.52 (3/8) dia. 32 to 42 (23.6 to 31.0)
12.70 (1/2) dia. 49 to 61 (36.1 to 45.0)
15.88 (5/8) dia. 63 to 75 (46.5 to 55.3)
19.05 (3/4) dia. 90 to 110 (66.4 to 81.1)
Adapter tightening torque
Adapter type Tightening torque [N·m (lbf·ft.)]
φ6.35mm (1/4in.)
→φ9.52mm (3/8in.)
16 to 18 (11.8 to 13.3)
φ12.7mm(1/2in.)
→φ15.88mm(5/8in.)
49 to 61 (36.1 to 45.0)
* When using the ADAPTER, be careful not to overtighten the
nut, or the smaller pipe may be damaged.
Adapter
Indoor unit pipe
Connection pipe
Flare nut
Earth
screw
Disconnect switch
Indoor unit
terminal block
Outdoor unit or
Branch box
Please connect
it to the specifi ed
terminal.
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