Installation
SiEN34-705
38
General Information
Checking for
Leaks
[Check 1] (Where pressure falls while carrying out Steps 1 to 3 described on previous page)
!
Check by ear......Listen for the sound of a major leak.
!
Check by hand......Check for leak by feeling around jointed sections with hand.
!
Soap and water check (
∗
Snoop)......Bubbles will reveal the presence of a leak.
[Check 2] (When searching for a minor leak or when there has been a fall in pressure while the
system has been fully pressurized but the source of the leak cannot be traced.)
1. Release the nitrogen until the pressure reaches 0.3MPa.
2. Increase pressure to 1.5MPa using gaseous flon gas (R-410A). (Nitrogen and flon gas
mixed)
3. Search for the source of the leak using a leak detector.
4. If the source of the leak still cannot be traced then repressurize with nitrogen up to 4.00MPa
and check again. (The pressure must not be increased to more than 4.00MPa.)
Setup of Air-tight Test
•
Referring to following figure, connect an nitrogen tank, refrigerant tank, and a vacuum pump to
the outdoor unit.
•
The shutoff valve and valve A~C in following figure should be open or closed as shown in the
table below.
!
Important points
1. Where the lengths of piping involved are particularly long then the air tight test should be
carried out block by block.
Example:
1. Indoor side
2. Indoor side + vertical pipes
3. Indoor side + vertical pipes + outdoor side
Go
u
ge m
a
nifold
Ch
a
rge
ho
s
e
V
a
c
uu
m p
u
mp
R-410A cylinder
(with
s
iphon)
G
as
s
ide
s
h
u
toff v
a
lve
S
h
u
toff v
a
lve
s
ervice port
V
a
lve B
V
a
lve C
V
a
lve A
Nitrogen
Me
asu
ring de
vice
O
u
tdoor
u
nit
O
u
tdoor
u
nit
Refriger
a
nt ch
a
rge port
To indoor
u
nit
Inter
u
nit piping
s
G
as
flow
Li
qu
id
s
ide
s
h
u
toff v
a
lve
Содержание RXYQ5PY1
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