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Performing leak test & insulation
Leak test
To identify potential gas leaks on the indoor unit, inspect the connection area
of each refrigerant pipe using a leak detector for R410A.
Before recreating the vacuum and recirculating the refrigerant gas, it is
advisable to pressurize the whole system with nitrogen (using a cylinder with
pressure reducer) at a pressure above 40 bar in order to immediately detect
leaks on the refrigerant fittings.
Made vacuum for 15 minutes and pressurising system with nitrogen.
• If the pipes require brazing ensure that OFN (Oxygen Free Nitrogen) is flowing through the system.
Insulation
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 T13.0 or thicker Acrylonitrile Butadien
Rubber separately around each refrigerant pipe.
• Always make the seam of pipes face upwards.
• The insulation has to be produced in full compliance 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.
2 Wind insulating tape around the pipes and drain hose avoiding to compress
the insulation too much.
3 Finish wrapping insulating tape around the rest of the pipes leading to the outdoor unit.
4 The pipes and electrical cables connecting the indoor unit with the outdoor
unit must be fixed to the wall with suitable ducts.
• All refrigerant connection must be accessible, in order to permit
either unit maintenance or removing it completely.
5. Select the insulation of the refrigerant pipe.
Insulate the gas side and liquid side pipe referring to the thickness according to the pipe size.
Indoor temperature of 30°C and humidity of 85% is the stan dard condition.
If installing in a high humidity condition, use one grade thicker insulator by referring to the table below.
If installing in an unfavorable conditions, use thicker one.
Insulator's heat-resistance temperature should be more than 120°C.
10
No gap
NBR(T13.0 or thicker)
Insulation cover pipe
Insulation pipe
Indoor unit
Be sure to overlap
the insulation
• Must fit tightly against
body without any gap.
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