(6) During welding,the gas pipe valve must be cooled down with a wet cotton cloth.
During welding of the distribution pipe
1.In case of brazing weld of joint,nitrogen must be filled in the pipe to prevent oxidization.
2.The refrigerant pipe should be newly-made and clean.During installation,do not let water and other
substance into the pipe.
3.Use two spanners to tighten the connecting nut.One spanner will make loose connection.
The torque moment should conform to the specified value.(Refer to the below)
Selection of tube material and size
Determinaltion of tube diameter (Refer to the diagram on next page for steps 1,2,3,4 and 5 below)
1.Tube between the outdoor unit and the first bypass(main tube):
The diameter of the main tube and the outdoor tube should be the same.
2. Tube between bypasses(sub-tube):
The diameter of the sub-pipe is determined according to the total capacity of all the connected
indoor units.But if it is larger than the capacity of the outdoor unit,the diameter should be determined
according the capacity of the outdoor unit.
Tube diameter
(mm)
12.70
Torque moment for
pre-installation (N.m)
49.0(5.0kgf m)
Install the nonreturn loop and oil trap
Torque moment for
tightening up (N.m)
53.9(5.5kgf m)
indoor unit
outdoor unit
Diag1.outdoor unit below the indoor unit.
oil trap
outdoor unit
Diag2. Outdoor unit is above the indoor unit
oil trap
indoor unit
(set 1 oil trap per 6 meters away from the lower unit)
gas pipe
(Radius 50mm)
6m
6m
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-205-
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