Gree GC201808-III, Service Manual

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GREE GMV5 HR HEAT RECOVERY UNITS
315
Four-way valve
Precondition: No refrigerant exists in the pipeline system and the power supply has been disconnected.
Step Diagram Operation Procedure
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/cm
2
(relative pressure).
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.