Gree GMV5E Series Service Manual page 276

GREE
Precondition: No refrigerant exists in the pipeline system and the power supply has been disconnected.
Step
3. Disassemble the
four-way valve.
4. Remove the four-way
valve.
5. Install a new four-way
valve.
6. Fix and wire the
electric box.
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
Four-way valve
Diagram
272
Operation Procedure
Use a screwdriver to unscrew
accessories of the four-way valve.
Remove the accessories.
●Heat the connecting pipes of the
four-way valve by acetylene welding
and then remove the pipes.
●Record the direction of the valve and
position of the pipe joints.
Note: Avoid nearby parts from being
burnt during welding.
● Remove the four-way valve from the
pipeline.
●Put the valve in a proper position.
● Weld the valve with the pipeline.
●Before welding, cover the valve with
wet cloth to avoid internal slide from
being burnt and prevent water from
flowing in the pipeline.
●During welding, charge nitrogen into
the pipes. The pressure should be
controlled within 0.5± 0.1 kgf/cm2
(relative pressure).
●Put the electric box back to original
position and screw it.
● Connect all lines.