Installation guide

En-6
6.6. Pipe connection
CAUTION
Tighten the flare nuts with a torque wrench using the specified tightening method.
Otherwise, the are nuts could break after a prolonged period, causing refrigerant to leak
and generate hazardous gas if the refrigerant comes into contact with a ame.
6.6.1. Flaring
Use special pipe cutter and are tool designed for R410A or R32 pipework.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and remove any burrs.
(3) Insert the are nut (always use the are nut attached to the indoor unit(s) and outdoor
unit or branch box respectively) onto the pipe and perform the are processing with a
are tool. Use the special R410A or R32 are tool, or the conventional are tool. Leak-
age of refrigerant may result if other are nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Die
A
Pipe
B
L
Check if [L] is flared uniformly
and is not cracked or scratched.
Pipe outside diameter
[mm (in.)]
Dimension A [mm]
Dimension B [mm]
Flare tool for R32,
clutch type
6.35 (1/4)
0 to 0.5
9.1
9.52 (3/8) 13.2
12.70 (1/2) 16.6
15.88 (5/8) 19.7
19.05 (3/4) 24.0
When using conventional are tools to are R32 pipes, the dimension A should be approx-
imately 0.5 mm more than indicated in the table (for aring with R32 are tools) to achieve
the specied aring. Use a thickness gauge to measure the dimension A.
Width across
flats
Pipe outside diameter [mm (in.)]
Width across flats
of Flare nut [mm]
6.35 (1/4) 17
9.52 (3/8) 22
12.70 (1/2) 26
15.88 (5/8) 29
19.05 (3/4) 36
6.6.2. Bending pipes
CAUTION
• 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 dif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.
Pipe
Insulating
Pipe
Cutter
Cut line
6.6.3. Flare connection
WARNING
The are connection shall not be performed indoors.
CAUTION
• Be sure to install the pipe against the port on the indoor unit correctly. If the center-
ing is improper, the are nut cannot be tightened smoothly. If the are nut is forced
to turn, the threads will be damaged.
• Do not remove the 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 are nut correctly.
• Tighten the are nuts with a torque wrench using the specied tightening method.
Otherwise, the are nuts could break after a prolonged period, causing refrigerant to
leak and generate hazardous gas if the refrigerant comes into contact with a ame.
• Connect the piping so that the control box cover can easily be removed for servic-
ing when necessary.
• In order to prevent water from leaking into the control box, make sure that the pip-
ing 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 following table for the flare nut tighten-
ing torques.)
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [mm (in.)] Tightening torque [N·m (kgf·cm)]
6.35 (1/4) dia. 16 to 18 (160 to 180)
9.52 (3/8) dia. 32 to 42 (320 to 420)
12.70 (1/2) dia. 49 to 61 (490 to 610)
15.88 (5/8) dia. 63 to 75 (630 to 750)
19.05 (3/4) dia. 90 to 110 (900 to 1,100)
Do not remove the cap from the connection pipe before connecting the pipe.
7. ELECTRICAL WIRING
WARNING
• Before connecting the wires, make sure the power supply is OFF.
• Every wire must be connected 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 re
hazard may also exist. Therefore, be sure all wiring is tightly connected.
• Connect wires to the matching numbers of terminals.
CAUTION
Be careful not to generate a spark as follows for using a 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
Type 60245 IEC57
Cable size 1.5 mm
2
(Inter-unit)
Earth (Ground) line
OUTDOOR UNIT
Please connect to the
specied terminal.
INDOOR UNIT
TERMINAL
Power line
Control line
9387603019_IM_En.indd 6 2/6/2018 10:12:04