5. PIPE INSTALLATION
WARNING
5.1.1. Flaring
B
L
Check if [L] is flared uniformly
and is not cracked or scratched.
CAUTION
5. 1. Flare connection (pipe connection)
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
Dimension B [mm]
9.1
13.2
16.6
19.7
24.0
5.1.2 Bending pipes
CAUTION
5.1.3. Pipe connection
CAUTION
Connection pipe
6. ELECTRICAL WIRING
WARNING
During installation, make sure that the refrigerant pipe is attached firmly before you
run the compressor.
Do not operate the compressor under the condition of refrigerant piping not
attached properly with 2-way or 3-way valve open. This may cause abnormal pressure in
the refrigeration cycle that leads to breakage and even injury.
During the pump-down operation, make sure that the compressor is turned off
before you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way
or 3-way valve open. This may cause abnormal pressure in the refrigeration cycle that
leads to breakage and even injury.
When installing and relocating the air conditioner, do not mix gases other than the
specified refrigerant R410A/R32 to enter the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise
to an abnormally high value and cause breakage, injury, etc.
If refrigerant leaks while work is being carried out, ventilate the area. If the
refrigerant comes in contact with a flame, it produces a toxic gas.
Be more careful so that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant R410A/R32 models. Also, when storing the piping, securely seal the openings
by pinching, taping, etc.
While brazing the pipes, be sure to purge with dry nitrogen gas.
• Use special pipe cutter and flare tool exclusive for R410A/R32.
(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 flare nut (always use the flare nut attached to the indoor and outdoor
units respectively) onto the pipe and perform the flare processing with a flare tool. Leakage
of refrigerant may result if other flare nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Pipe outside diameter
[mm (in.)]
When using conventional flare tools to flare R410A/R32 pipes, the dimension A should be
approximately 0.5 mm more than indicated in the table to achieve the specified flaring.
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes at an angle more than 90°.
• When pipes are repeatedly bend or stretched, the material will harden, making it difficult
to bend or stretch them any more.
• Do not bend or stretch the pipes more than 3 times.
Be sure to connect the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the flare nut cannot tightened smoothly. If the flare
nut is forced to turn, the threads will be damaged.
Do not remove the flare nut from the indoor unit pipe until immediately before connecting
the connection pipe.
Do not use mineral oil on flared part. Prevent mineral oil from getting into the system as
this would reduce the lifetime of the units.
(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the indoor unit, and then turn the flare nut by hand.
PIPING EXTENSION
Ø 6.35
Ø 9.52
Ø 12.7
Ø 15.88
Ø 19.05
Ø 22.22
18-20 N.m
(183-204 kgf.cm)
25-26 N.m
(255-265 kgf.cm)
35-36 N.m
(357-367 kgf.cm)
45-47 N.m
(459-480 kgf.cm)
65-67 N.m
(663-683 kgf.cm)
75-85N.m
(765-867 kgf.cm)
8.4/0.33
13.2/0.52
16.2/0.64
19.2/0.76
23.2/0.91
26.4/1.04
8.7/0.34
13.5/0.53
16.5/0.65
19.7/0.78
23.7/0.93
26.9/1.06
Indoor unit tubing Flare nut Pipe
90 ° ±4
A
R0.4~0.8
45°±2
Pipe
gauge
Tightening
torque
Flare dimension (A)
(Unit: mm/Inch)
Min. Max. Flare shape
(3) When the flare nut is tightened properly by your hand, hold the body side coupling
with a separate spanner, then tighten with a torque wrench. (See the table previous for
the flare nut tightening torques.
Electrical work must be performed in accordance with this Manual by a person certified
under the national or regional regulations. Be sure to use a dedicated circuit for the unit.
An insufficient power supply circuit or improperly performed electrical work can cause
serious accidents such as electric shock or fire.
Before starting work, check that power is not being supplied to the indoor unit and
outdoor unit. Use the included connection cables and power cables or ones specified by
the manufacturer. Improper connections, insufficient insulation, or exceeding the allowable
current can cause electric shock or fire.
For wiring, use the prescribed type of cables, connect them securely, making sure
that there are no external forces of the cables applied to the terminal connections.
Improperly connected or secured cables can cause serious accidents such as overheating
the terminals, electric shock, or fire.
Do not modify the power cables, use extension cables, or use any branches in the
wiring. Improper connections, insufficient insulation, or exceeding the allowable current
can cause electric shock or fire.
Match the terminal board numbers and connection cable colors with those of the
outdoor unit. Erroneous wiring may cause burning of the electric parts.
Securely connect the connection cables to the terminal board. In addition, secure
the cables with wiring holders. Improper connections, either in the wiring or at the ends of
the wiring, can cause a malfunction, electric shock, or fire.
Always fasten the outside covering of the connection cable with the cable clamp. (If
the insulator is chafed, electric leakage may occur.) Securely install the electrical box
cover on the unit. An improperly installed electrical box cover can cause serious accidents
such as electric shock or fire through exposure to dust or water.
Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit
could result. Install a earth (ground) leakage breaker. In addition, install the earth
(ground) leakage breaker so that the entire AC main power supply is cut off at the same
time. Other-wise, electric shock or fire could result.
Always connect the earth (ground) cable. Improper earthling (grounding) work can
cause electric shocks. Install the remote controller cables so as not to be touched directly
with your hand.
Perform wiring work in accordance with standards so that the air conditioner can be
operated safely and positively. Unit shall be earthen (grounded) in compliance with the
applicable local and national codes.
To prevent breaking of the pipe, avoid sharp bends. If the
pipe is bent repeatedly at the same place, it will break.
R.E.E ELECTRIC APPLIANCES JSC
En-6
