28
Performing leak test & 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.
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.
◆
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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 248
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Leak test
Insulation
No gap
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Insulation cover pipe
Indoor unit
Be sure to overlap
the insulation
Insulation pipe
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body without any gap.
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either unit maintenance or removing it completely.
◆
LEAK TEST WITH NITROGEN (before opening valves)
In order to detect basic refrigerant leaks, before recreating the vacuum and recirculating the R-410A, it’s responsable
of installer to pressurize the whole system with nitrogen (using a cylinder with pressure reducer)
at a pressure above 30 bar (gauge).
◆
LEAK TEST WITH R-410A (after opening valves)
Before opening valves, discharge all the nitrogen into the system and create vacuum. After opening valves check
leaks using a leak detector for refrigerant R-410A.
MA Duct Type
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Summary of Contents for Duct Type Series
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