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All field piping must be provided by a licensed
refrigeration technician and must comply with the
relevant local and national codes.
INSTALL THE REFRIGERANT PIPE
CAUTION
PRECAUTIONS
• Execute heat insulation work completely on both
sides of the gas piping and liquid piping, otherwise,
this can sometimes result in water leakage. (When
using a heat pump, the temperature of the gas
piping can reach up to approximately 120˚C/248˚F.
Use insulation which is sufficiently resistant).
• Also, in cases where the temperature and
humidity of the refrigerant piping sections might
exceed 30˚C/86˚F or Rh 80%, reinforce the
refrigerant insulation(20mm/0.8" or thicker).
Condensation may form on the surface of the
insulating material.
• Before connecting tubes, check which type of
refrigerant is used.
•
DO NOT
mix anything other than the specified
refrigerant, such as air, etc., inside the refrigerant
circuit.
• If the refrigerant gas leaks during the operation,
ventilate the area. A toxic gas is emitted by the
refrigerant gas being exposed to a fire.
• Make sure there is no refrigerant gas leak. A toxic
gas may be released by the refrigerant gas
leaking indoor and being exposed to flames from
an area heater, cooking stove, etc.
• Refer to the table below for the dimensions of
flare nuts spaces and the appropriate tightening
torque. (Overtightening may damage the flare
and cause leaks).
FLARING THE PIPE END
• Cut the pipe end with a pipe cutter.
• Remove burrs with the cut surface facing
downward so that the chips do not enter the pipe.
Align the centers of both flares and tighten the flare
nuts 3 or 4 turns by hand. Then tighten them fully
with the torque wrenches.
REFRIGERANT PIPING
• Coat the flare both inside and outside with either
oil or ester oil.
• Put the flare nut on the pipe.
• Flare the pipe.
• Check that the flaring is properly made.
Pipe gauge
(mm)
Tightening torque
Flare dimension
A (mm)
O
6.35
(.25")
15~16 N. m
(153~163 kgf.cm)
8.3~8.7
0.327~0.343"
12.0~12.4
0.472~0.488"
15.4~15.8
0.606~0.622"
18.6~19.0
0.732~0.748"
25~26 N. m
(255~265 kgf.cm)
35~36 N. m
(357~367 kgf.cm)
45~47 N. m
(459~480 kgf.cm)
O
9.52
(.375")
O
12.7
(.5")
O
15.9
(.625”)
Cut exactly at
right angles.
Remove burrs.
Outer diam.
(mm)
A(mm)
Max.
1.3
1.6
1.8
2.2
Min.
0.7
1.0
1.0
2.0
O6.35
(.25")
O9.52
(.375")
O12.7
(.5")
O15.9
(.625")
Die
Copper pipe
A
Set exactly at the position shown below.
(in=mm/25.4)
Flare
'
s inner surface
must be flaw-free
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
1 Torque wrench
2 Flare nut
3 Piping union
4 Spanner
1
2 3 4
Coat here with ether oil or ester oil
