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 cylinder with pressure reducer)at a
pressure above 30 bar (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.
Once you have checked that there are no leaks in the system,
you can insulate the piping and hose.
To avoid condensation problems,place
T13.0 or thicker Acrylonitrile
Butadiene Rubber
around each refrigerant pipe.
1
Wind insulating tape around the pipes and drain hose avoiding to compress
the insulation too much.
2
Finish wrapping insulating tape around the rest of the pipes leading to the
outdoor unit.
3
The pipes and electrical cables connecting the indoor unit with the outdoor
unit must be fixed to the wall with suitable ducts.
4
Always make the seam of pipes face upwards.
N
N
N
N
o
o
o
o
tt
tt
e
e
e
e
Leak Test
Insulation
Insulation
Be sure to overlap
the insulation
Indoor Unit
C
C
C
C
A
A
A
A
U
U
U
U
T
T
T
T
II
II
O
O
O
O
N
N
N
N
Must fit tightly against
body without any gap.
No gap
NBR(T13.0 or thicker)
E-
18
I
NSTALLING THE
I
NDOOR
U
NIT
Performing Leak Test & Insulation
❊
The designs and shape are subject to
change according to the model.
Discharge all the nitrogen to create a vacuum and charge the system.
C
C
C
C
A
A
A
A
U
U
U
U
T
T
T
T
II
II
O
O
O
O
N
N
N
N
All refrigerant connection must be accessible, in order to permit
either unit maintenance or removing it completely.
C
C
C
C
A
A
A
A
U
U
U
U
T
T
T
T
II
II
O
O
O
O
N
N
N
N
MH***FKEA IM_E_27682_4 5/25/04 3:28 AM Page 18
