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Removal of Four Way Valve / Electronic Expansion Valve
Step
Before working, make
sure that the refrigerant is
empty in the circuit.
Be sure to apply nitrogen
replacement when
heating up the brazed
part.
Provide a protective
4
sheet or a steel plate so
that the brazing flame
cannot influence
peripheries around the
four way valve.
Warning
Since it may happen
that refrigerant oil in
the compressor
catches fire, prepare
wet cloth so as to
extinguish fire
immediately.
Warning
Ventilate when
refrigerant leaks
during the work.
(If refrigerant contacts
fire, it causes to arise
toxic gas.)
Warning
Be careful about the
four way valve, pipes
and so on, which were
heated up by a gas
brazing machine, so
as not to get burnt
your hands.
Cut off the brazed part
5
with pliers and
disconnect.
36
Procedure
Points
Reassembling precautions
1. Use non-oxidizing brazing
method. If nitrogen gas is not
available, braze the parts
speedily.
2. Avoid deterioration of the
gaskets due to carbonization
of oil inside the four way
valve or thermal influence.
For this purpose, wrap the
four way valve with wet
cloth. Splash water over the
cloth against becoming too
hot (keep it below 120°C).
In pulling the pipes, be
careful not to over-tighten
them with pliers. The pipes
may get deformed.
In case of the difficulty with a
(R7857)
gas brazing machine
1. Disconnect the brazed part
where is easy to disconnect
and restore.
2. Cut pipes on the main unit by
a miniature copper tube
cutter in order to make it
easy to disconnect.
Note:
Do not use a metal saw for
cutting pipes by all means
because the sawdust come
into the circuit.
(R7858)
The brazed parts are heated
after being disconnected. To
avoid a burn, make sure that
the compressor is cooled
down before removing.
(R7859)
Removal Procedure
Si00-973
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