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.
Indoor temperature of 30°C and humidity of 85% is the stan dard 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 120°C.
Leak test
Insulation
No gap
NBR(T13.0 or thicker)
Insulation cover pipe
Indoor unit
Be sure to overlap
the insulation
Insulation pipe
• Must fit tightly against
body without any gap.
• Always make the seam of pipes face upwards.
• All refrigerant connection must be accessible, in order to permit
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 40 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.
• Discharge all the nitrogen to create a vacuum and charge the system.
Summary of Contents for AJ FBMDEC Series
Page 1: ......
