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Si341211
Procedure to Remove Electronic Expansion Valve and Peripheral Equipment
Removal Procedure
17
Step
Procedure
Points
Make sure that there is no
refrigerant gas left within
the refrigerant circuit
system before performing
the operation.
Precautions on mounting
���
Mount it by means of the
non-oxidation brazing
method.
If nitrogen gas is not
available, quickly operate to
mount it.
���
It is necessary to prevent the
packing from deterioration
due to the carbonization of oil
or the heat affection within
the four way valve. For this
purpose, avoid the heating of
the valve by wrapping its
body with wet cloth and then
supplying water to the cloth to
keep wet.
(Keeping a temperature of
120
º
C or lower)
5
Disconnect the brazing
part of main body at
electronic expansion
valve at its soldered
portion.
6
Disconnect the brazing
part of main body at
pressure switch at its
soldered portion.
Be careful not to crash the
piping by over-pressing it
with a plier when pulling out
it.
In case it is difficult to cut off by
a gas welder and remove it,
1. Remove any point of the
piping connections (brazing
portions), which is easy to
remove or mount.
2. Make it easy to remove it by
cutting the piping etc. of the
body with a small copper
pipe cutter.
Note: Never use a metal saw for
sure since cut chips may
be mixed into the piping.
Brazing part
Pressure switch
Main body of
electronic
expansion valve
Main body of
subcooling
electronic
expansion valve
Warning
If refrigerant gas leaks during
operation, ventilate the room.
(The exposure of refrigerant gas
to a fire causes generates toxic
gas.)
Caution
Do not suffer burns due to
contact with piping etc. heated by
a gas welder.
Caution
Protect the periphery of the
above by welding operation
sheets or steel plates, etc. so that
flame from a gas welder does not
affect surrounding of the
electronic expansion valve.