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

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Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial MAINTENANCE
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4. Remove the electric
expansion valve.
●Remove the electric expansion valve.
5. Install a new electric
expansion valve.
●Weld the connecting pipes with the electric
expansion valve.
●Before welding, cover the valve with wet cloth.
●During welding, charge nitrogen into the pipes.
The pressure should be controlled within
0.5±0.1 kgf/cm
2
(relative pressure).
Note: Avoid nearby parts from being burnt
during welding.
●Install the coil on the electric expansion valve.
6. Fix and wire the electric
box.
●Put the electric box back to original position
and screw it.
●Connect all lines.
7. Check and install the front
panels.
●Check various parts and connecting lines.
●If no problem is found, hook the front panels
and tighten the screws.