En-13
Protection of pipes
4. 3.
Location
Working period
Protection method
Outdoor
1 month or more
Pinch pipes
Less than 1 month
Pinch or tape pipes
Indoor
—
Pinch or tape pipes
Protect the pipes to prevent the entry of mois-
•
ture and dust.
Especially pay attention when passing the pipes
•
through a hole or connecting the end of a pipe
to the outdoor unit.
PIPE INSTALLATION
5.
Brazing
5. 1.
CAUTION
If air or another type of refrigerant enters the refrigeration cycle, the
•
internal pressure in the refrigeration cycle will become abnormally
high and prevent the unit from exerting its full performance.
Fig.
Apply nitrogen gas while brazing the pipes.
•
Nitrogen gas pressure: 0.02 MPa (= pressure felt suf
fi
ciently on the
back of your hand)
If a pipe is brazed without applying nitrogen gas, it will create an oxidation
fi
lm.
•
This can degrade performance or damage the parts in the unit (such as the compressor or valves).
Do not use
fl
ux to braze pipes. If the
fl
ux is the chlorine type, it will cause the pipes to corrode.
•
In addition, if the
fl
ux contains
fl
uoride, it will affect the refrigerant piping system due to deterioration of refrigerant oil.
For brazing material, use phosphor copper that does not require
fl
ux.
•
Indoor unit pipe connections
5. 2.
CAUTION
Separation tube
A : Outdoor unit or Refrigerant branch kit
B : Indoor unit or Refrigerant branch kit
Header
A
B
A
B
A
B
H
1
= 0 mm –
10 mm
(
A
1
: 0
o
– 1
o
)
B
1
: -10
o
– 10
o
H
2
= 0 mm –
10 mm
(
A
2
: 0
o
– 1
o
)
B
2
: -10
o
– 10
o
C
H
1
A
1
B
1
D
H
2
A
2
B
2
Pressure regulating valve
Brazing area
Nitrogen gas
Cap
OK
NO GOOD
NO GOOD
Horizontal
line
Horizontal
line
VIEW D
VIEW C
Horizontal
line
Horizontal
line
Gas pipe
Liquid pipe
Outdoor
unit side
Outdoor
unit side
OK
Horizontal
Vertical
Horizontal line
or
NO GOOD
±15°C
9378945029-03_IM_EN.indb 13
9378945029-03_IM_EN.indb 13
2011-9-20 16:25:49
2011-9-20 16:25:49
