GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
272
Four-way valve
Precondition: No refrigerant exists in the pipeline system and the power supply has been disconnected.
Step
Diagram
Operation Procedure
3. Disassemble the
four-way valve.
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.
4. Remove the four-way
valve.
●Remove the four-way valve from the
pipeline.
5. Install a new four-way
valve.
●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).
6. Fix and wire the
electric box.
●Put the electric box back to original
position and screw it.
●Connect all lines.
