24
A
Performing leak test & insulation
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(594.7 psig) (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.
K
The designs and shape are subject to change according to the model.
AM
77
FNLD
777
AM
77
FNMD
777
/
AM
77
FNHD
777
Leak test
Insulation
AM
77
JNMD
777
/
AM
77
JNHD
777
AM
77
JNMP
777
(Drain pump built-in)
No gap
NBR(T13.0(0.51") or thicker)
Insulation cover pipe
Indoor unit
Be sure to overlap
the insulation
Insulation pipe
Must fit tightly against body
without any gap.
Caution
Discharge all the nitrogen to create a vacuum and charge the system.
Caution
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(0.51") 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
inish 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.
AM
77
MNMD
777
/
AM
77
MNHD
777
(Drain pump built-in)