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5 Check that the flaring is correct, referring to the illustrations
below for examples of incorrect flaring.
Damaged
Correct
Inclined
Surface
CAUTION
• If the pipes require brazing ensure that OFN (Oxygen Free
Nitrogen) is flowing through the system.
• Nitrogen blowing pressure range is 0.02 ~ 0.05MPa.
Step 7 Performing the gas leak test
Pressure check the refrigerant system using high pressure
nitrogen in order to detect basic refrigerant leaks. Before
performing the vacuum process and releasing the factory R-410A
charge into the refrigerant pipes, it is the responsibility of the
installer to pressurize the whole system with nitrogen (using a
cylinder with pressure reducer) at a pressure above 580.2 psi (4
MPa)(gauge).
CAUTION
• If the pipes require brazing ensure that OFN (Oxygen Free
Nitrogen) is flowing through the system.
Step 8 Insulating the refrigerant pipes
Once you have checked that there are no leaks in the system, you
can insulate the piping and hose.
1
Uneven
Cracked
Thickness
• Always make the seam of pipes face upwards.
• The insulation has to be produced in full compliance of
2 Wind insulating tape around the pipes and drain hose
• Be sure to wrap insulation tightly without any gaps.
To avoid condensation problems, place Acrylonitrile Butadien
Rubber separately around each refrigerant pipe.
No gap
NBR
NOTE
CAUTION
European regulation reg. EEC / EU 2037/ 2000 that requires
the use of sheaths insulation form without using CFC and
HCFC gases for health and the environment.
avoiding compressing the insulation too much.
Insulation cover pipe
Insulation pipe
Indoor unit
Be sure to overlap the insulation.
CAUTION
11
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