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5 Check that the flaring is correct, referring to the
illustrations below for examples of incorrect flaring.
Damaged
Inclined
Correct
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
To identify potential gas leaks on the indoor unit, inspect
the connection area of each refrigerant pipe using a leak
detector for R-32.
Before recreating the vacuum and recirculating the
refrigerant gas, pressurize the whole system with
nitrogen (using a cylinder with a pressure reducer) at a
pressure above 4 MPa in order to immediately detect
leaks on the refrigerant fittings.
Made vacuum for 15 minutes and pressurizing system
with nitrogen.
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 To avoid condensation problems, place Acrylonitrile
Cracked
Uneven
Thickness
• Always make the seam of pipes face upwards.
• The insulation has to be produced in full compliance
2 Wind insulating tape around the pipes and drain hose
• Be sure to wrap insulation tightly without any gaps.
Butadien Rubber separately around each refrigerant pipe.
No gap
NBR
NOTE
CAUTION
of 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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