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Performing Leak Test & Insulation
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.
12
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.
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.
Note
Always make the seam of pipes face upwards.
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.
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