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Dimension A [mm]
Pipe outside diameter
Flare tool for R410A,
[mm (in.)]
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
When using conventional fl are tools to fl are R410A pipes, the dimension A should be ap-
proximately 0.5 mm more than indicated in the table (for fl aring with R410A fl are tools) to
achieve the specifi ed fl aring. Use a thickness gauge to measure the dimension A.
Width across
Pipe outside diameter [mm (in.)]
flats
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
6.6.2. Bending pipes
• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.
• The pipes are shaped by your hands. Be careful not to collapse them.
• Bend R70 mm or more with a pipe bender.
• 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.
• When bending the pipe, do not bend it as
is. The pipe will be collapsed. In this case,
cut the insulating pipe with a sharp cutter
as shown on the right, and bend it after
exposing the pipe. After bending the pipe
as you want, be sure to put the heat insu-
lating pipe back on the pipe, and secure it
with tape.
6.6.3. Pipe connection
• Be sure to install the pipe against the port on the indoor unit correctly. If the centering
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.
• 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 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 table below for the flare nut tightening
torques.)
Torque wrench
Indoor unit pipe
(Body side)
Dimension B [mm]
clutch type
9.1
13.2
0 to 0.5
16.6
19.7
24.0
Width across flats
of Flare nut [mm]
17
22
26
29
36
CAUTION
Pipe
Insulating
Pipe
Cutter
Cut line
CAUTION
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Flare nut [mm (in.)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
Do not remove the cap from the connection pipe before connecting the pipe.
7. ELECTRICAL WIRING
Be careful not to generate a spark as follows for using a fl ammable refrigerant.
• Do not remove the fuse while the power is on.
• Do not disconnect the wiring while the power is on.
• It is recommended to position the outlet connection in a high position. Place the
cords so that they do not get tangled.
7.1. Wiring system diagram
• 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.
INDOOR UNIT
TERMINAL
Earth (Ground) line
7.2. Indoor unit wiring
(1) Open the intake grille. Remove the tapping screw for the wire cover and remove the
wire cover.
Screw
(2) Remove the tapping screw and while minding the cable clamp hook, remove the cable
clamp.
Screw
Cable clamp
Tightening torque [N·m (kgf·cm)]
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1,100)
CAUTION
WARNING
OUTDOOR UNIT
Power line
Control line
Please connect to the
specifi ed terminal.
Wire cover
Hook
Cable clamp
En-5
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