En-5
When using conventional fl are tools to fl are R410A pipes, the dimension A should be
approximately 0.020 in. (0.5 mm) more than indicated in the table (for fl aring with R410A
flare tools) to achieve the specified flaring. Use a thickness gauge to measure the
dimension A.
Width across
flats
Pipe outside
diameter [in. (mm)]
Width across flats of
Flare nut [in. (mm)]
1/4 (6.35)
11/16 (17)
3/8 (9.52)
7/8 (22)
1/2 (12.70)
1 (26)
5/8 (15.88)
1-1/8 (29)
3/4 (19.05)
1-7/16 (36)
5.6.2. Bending pipes
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bend or stretched, the material will harden, making it diffi cult
to bend or stretch them anymore.
• Do not bend or stretch the pipes more than 3 times.
CAUTION
• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.
5.6.3. Pipe connection
CAUTION
• Be sure to Install the pipe against the port on the indoor unit correctly. If the center-
ing is improper, the fl are nut cannot tighten smoothly. If the fl are nut is forced to
turn, the threads will be damaged.
• Do not remove the fl are nut from the indoor unit pipe until immediately before con-
necting the connection pipe.
• Hold the torque wrench at its grip, keeping it in the right angle with the pipe, in order
to tighten the fl are nut correctly.
• Tighten the fl are nuts with a torque wrench using the specifi ed tightening method.
Otherwise, the fl are nuts could break after a prolonged period, causing refrigerant to
leak and generate hazardous gas if the refrigerant comes into contact with a fl ame.
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 outdoor unit is necessary to connect
the indoor unit to the outdoor unit.
Single type installation
MODEL
ADAPTER
Liquid pipe Gas pipe
18 type Use Use
24 type Use No use
Multi type installation
MODEL
ADAPTER
Liquid pipe Gas pipe
18 type No use No use
24 type No use No use
When the flare nut is tightened properly by your hand, hold the body side coupling with a
wrench, then tighten with a torque wrench. (See the following table for the flare nut tight-
ening torques.)
Tighten with two wrenches.
Holding wrench
Flare nut
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [in. (mm)] Tightening torque [lb·ft (N·m)]
1/4 (6.35) dia. 11.8 to 13.3 (16 to 18)
3/8 (9.52) dia. 23.6 to 31.0 (32 to 42)
1/2 (12.70) dia. 36.1 to 45.0 (49 to 61)
5/8 (15.88) dia. 46.5 to 55.3 (63 to 75)
3/4 (19.05) dia. 66.4 to 81.1 (90 to 110)
Adapter tightening torque
Adapter type Tightening torque [lbf·ft. (N·m)]
φ1/4in. (6.35mm)
→φ3/8in. (9.52mm)
11.8 to 13.3 (16 to 18)
φ1/2in. (12.7mm)
→φ5/8in. (15.88mm)
36.1 to 45.0 (49 to 61)
* 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
6. ELECTRICAL WIRING
6.1.
Wiring system diagram
WARNING
• Before connecting the wires, make sure the power supply is OFF.
• Every wire must be connected fi rmly.
• No wire should be allowed to touch refrigerant tubing, the compressor or any mov-
ing 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.
14AWG
(Inter-unit)
INDOOR UNIT SIDE
Earth (ground)
line
DISCONNECT
SWITCH
(Locally purchased)
OUTDOOR UNIT
Connect it to
the specifi ed
terminal.
INDOOR UNIT
TERMINAL
Power line
Control line
Disconnect switch - locally procured if required by local code. Select the correct capacity
of disconnect switch according to the load.
Earth
(Ground)
screw
Disconnect switch
Indoor unit
terminal block
Outdoor unit
Please connect
it to the specifi ed
terminal.
9318739244_IM.indb 59318739244_IM.indb 5 2016/11/29 下午 10:40:182016/11/29 下午 10:40:18
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