EEV KIT INSTALLATION
11
ENGLISH
Brazing Work
CAUTION
• 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.
• 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).
• The leakage test is executed by pressurizing nitrogen gas up to 3.8MPa(38.7kgf/cm2) (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.
• Make sure that field pipes are fully insulated. Field pipe insulation must reach up to the
pipe insulation(D). Make sure that there is no gap between both ends in order to avoid
condensation dripping(Finish the connection with tape eventually)
• Make sure to cool the filters and EEV body with a wet cloth and make sure the body tem-
perature does not exceed 120°C during brazing.
• For more details, refer to the manual of the outdoor unit.
!
a
b
c
d
f
brazing
e
f
a
Refrigerant piping
b
Part to be brazed
c
Taping
d
Hands valve
e
Pressure-reducing valve
f
Nitrogen
