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INSTALLATION MANUAL
3.
INSTALL THE REFRIGERANT PIPE
All field piping must be provided by a licensed refrigeration
technician and must comply with the relevant local and
national codes.
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 . Use insulation which is
sufficiently resistant.)
Also, in cases where the temperature and humidity of the
refrigerant piping sections might exceed 30
reinforce the refrigerant insulation(20mm or thicker).
Condensation may form on the surface of the insulating material.
Before rigging tubes, check which type of refrigerant is used.
Use a pipe cutter and flare suitable for used refrigerant.
Only use annealed material for flare conncetions.
Do not mix anything other than the specified refrigerant, such
as air, etc.., Inside the refrigerant circuit.
If the refrigerant gas leaks during the work, 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.)
Pipe gauge
Tightening torque
(mm)
15~16 N. m
O6.35
(153~163 kgf.cm)
25~26 N. m
O9.52
(255~265 kgf.cm)
35~36 N. m
O12.7
(357~367 kgf.cm)
45~47 N. m
O15.9
(459~480 kgf.cm)
97.2~118.6 N. m
O19.1
(990~1210 kgf.cm)
Check whether the height drop between the indoor unit and
outdoor unit, and the length of refrigerant pipe meet the following
requirements:
Pipe
Model
Gas
Liquid
MUSTR-18-H8
1/2"
1/4"
MUSTR-24-H8
5/8"
3/8"
MUSTR-30-H8
5/8"
3/8"
MUSTR-36-H8
5/8"
3/8"
MUSTR-48-H8
5/8"
3/8"
MUSTR-48-H8T
5/8"
3/8"
MUSTR-60-H8T
5/8"
3/8"
The minimum pipe length is 2m.
or Rh80%,
Flare dimension
Flare shape
A (mm)
8.3~8.7
o
4
90
o
12.0~12.4
A
15.4~15.8
R0.4~0.8
18.6~19.0
22.9~23.3
Additional
Preload
Max. distance
Load
up to
(g/m)
(m)
A
B
20
30
15
5
25
50
30
5
25
50
30
5
30
65
30
5
30
65
30
5
30
65
30
5
30
65
30
5
Case 1
Case 1 (ODU lower than IDU)
When the outdoor unit is higher than the indoor unit and the height
difference is greater than 10m, an oil trap (siphon) must be installed
in the gas pipe every 6m.
Oil trap
ODU
Case 2 (IDU lower than ODU)
When the indoor unit is higher than the outdoor unit and the height
difference is greater than 10m, an oil trap (siphon) must be installed
in the gas pipe every 10m.
Oil trap
IDU
3.1 Flaring the pipe end
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing downward so that the
chips do not enter the pipe.
Cut exactly at
right angles.
3) Put the flare nut on the pipe.
4) Flare the pipe.
A(mm)
Outer diam.
(mm)
Max.
1.3
O6.35
O9.52
1.6
O12.7
1.8
O15.9
2.2
46
Case 2
Gas
IDU
10m
Liquid
10m
Gas
ODU
6m
Liquid
6m
Remove burrs.
Set exactly at the position shown below.
Min.
0.7
1.0
1.0
Copper pipe
2.0
A: Vertical
B: Total
Die
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