AA
22
English
Performing leak test & insulation
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.
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 Butadien Rubber separately
around each refrigerant pipe.
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.
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 less than 85% is the standard con-
dition.
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.
• If the pipes require brazing ensure that OFN (Oxygen Free Nitrogen) is flowing through the system.
Leak test
Insulation
No gap
NBR
Insulation cover pipe
Indoor unit
Be sure to overlap
the insulation
Insulation pipe
• Must fit tightly against
body without any gap.
• Always make the seam of pipes face upwards.
• All refrigerant connection must be accessible, in order to permit
either unit maintenance or removing it completely.
CAUTION
CAUTION
NOTE
CAUTION
Содержание AC NN4SEC Series
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