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 R-410A, 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 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.
• Discharge all the nitrogen to create a vacuum and charge
the system.
CAUTION
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.
• 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
No gap
NBR(T13.0 or thicker)
Be sure to overlap the insulation
Indoor unit
Insulation cover pipe
Insulation pipe
• Must fit tightly against body
without any gap.
CAUTION
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English-19