INVENTOR u-match on/off, Service Manual

Page: 122 / 163

U-MATCH AIR CONDITIONERS MAINTENANCE
119
3. Disassembly of 4-way
valve
Heat connection pipes for
4 pipes of 4-way valve
with gas welding before
removal of 4-way valve.
Record the direciton of the
4-way valve and
installation postition of
each pipe before welding
away 4-way valve.
4. Removal of 4-way valve
Remove the old 4-way
valve from the pipe line.
5. Assembly of new 4-way
valve
Position accurately the
new 4-way valve.
Connect new 4-way valve
with pipe line.
Wrap the valve with wet
cloth when welding 4-way
valve in case sliding block
inside the valve should be
burnt and water flow into
the pipe line.
Welding with nitrogen and
the nitrogen pressure shall
be 0.5±0.1kgf/c
΃
(relative
pressure).
6. Assembly of solenoid
valve
Assemble solenoid valve
onto the new 4-way valve in
order of disassembly.
7. Examination of System
and cooling medium
Pump vacuum and fill
cooling medium if the
Disassemble
connecting
pipes at E,S,D
and C orifices
Mount a new
4-way vlave
Mount
solenoid
valve