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Performing leak test & insulation
Leak test
LEAK TEST WITH NITROGEN (before opening valves)
In order to detect basic refrigerant leaks, before recreating the vacuum and
recirculating the R410A, it's responsible of installer to pressurize the whole system
with nitrogen (using a pressure regulator) at a pressure above 4.1MPa (gauge).
LEAK TEST WITH R410A (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
R410A.
• Discharge all the nitrogen to create a vacuum and charge the system.
CAUTION
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.
NOTE
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.
CAUTION
5. Select the insulation of the refrigerant pipe.
f Insulate the gas side and liquid side pipe referring to the thickness according to the pipe size.
X
f Indoor temperature of 86°F(30°C) and humidity of 85% is the stan dard condition.
X
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.
f Insulator's heat-resistance temperature should be more than 248°F(120°C).
X
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Big Duct_IBIM_E_33766-3.indd 22
Leak check
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.
CAUTION
2012-01-13 오후 9:40:29
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