Gree Ultra Heat GMV-VQ72W/A-F, Service Manual

Page: 174 / 207

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial MAINTENANCE
170
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.