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EXPANSION KIT Installation
Brazing work
CAUTION
n Be sure to carry out a nitrogen blow when brazing.
Brazing without carrying out nitrogen replacement or releasing nitrogen into the piping will
create large quantities of oxidized film on the inside of the pipes, adversely affecting
valves and compressors in the refrigerating system and preventing normal operation.
n When brazing while inserting nitrogen into the piping, nitrogen must be set to 0.02 MPa
with a pressure-reducing valve(just enough so that it can be felt on the skin).
a
a Refrigerant piping
c Taping
e Pressure-reducing valve
n The leakage test is executed by pressurizing nitrogen gas up to 3.8MPa(38.7kgf/cm
(The test must be done with the service valve of the outdoor unit closed and the gas must
be pressurized at the liquid pipe, gas pipe and high/low pressure common pipe of the
outdoor unit), and the pressure of the nitrogen gas must not drop for 24 hours.
n For more details, refer to the manual of the outdoor unit.
10 AHU EXPANSION KIT
b
brazing
f
b Part to be brazed
d Hands valve
f Nitrogen
c
d
e
f
2
)
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