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The first connecting methond
Outdoor unit
L1
The first manifold
The second connecting methond
Outdoor unit
The First manifold
5.6 Remove Dirt or Water in the Pipe
1. Make sure there is no any dirt or water before connecting the
pipe to the outdoor units.
2. Wash the pipe with high pressure nitrogen, never use
refrigerant of outdoor unit.
5.7 Airtight Test
1. Connect the high pressure side pipe and liquid side stop valve
after connecting indoor unit pipes.
2. Weld low pressure side pipe and meter connector.
3. Use vacuum pump to discharge air from valve core of liquid
side stop valve and meter connector until the pressure reaches
2
to -1kgf/cm
.
4. Close the vacuum pump and fill nitrogen40kgf/cm
5. At the end of air tightness test, the gas side stop valve and
the low pressure side piping should be welded.
Pipe length(From the nearest branch pipe equivalent length)
A
(From the first line branch pipe) Maximum pipe equivalent length
L2
L3
B
b
Indoor unit farthest pipe equivalent
length
L
2
L
1
A
L
3
2
.
a
Maximum pipe equivalent length
L4
L5
D
C
c
d
Indoor Unit
Pipe length(From the nearest manifold
equivalent length)
B
(From the first manifold)
Maximum pipe equivalent length
L
4
D
C
L
5
E
Indoor unit
Nitrogen
Nitrogen
10
E
e
f
N1
a
N
2
b
c
N
3
N
4
d
f
e
N
5
N
6
Liquid side stop valve
Gas side stop valve
Liquid pipe
Gas pipe
Meter connector components
used for pressure bulge test
Fig.5-6
Fig.5-7
Indoor unit
Fig.5-8
V.2
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