32
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.
◆
Indoor temperature of 86°F(30°C) and humidity of 85% is the standard 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 248°F(120°C).
Leak test
Insulation
No gap
NBR[T0.511inch(13mm) or thicker]
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, Licensed and authorized installer shall pressurize
the whole system with nitrogen (using a cylinder with pressure reducer)
at a pressure above 40 bar (gauge).
◆
LEAK TEST WITH R-410A (after opening valves)
Before opening valves, discharge all the nitrogen into the system and cre-
ate vacuum. After opening valves check leaks using a leak detector for
refrigerant R-410A.
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Slim Duct Type
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The designs and shape are subject to
change according to the model.
Global Duct Type
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