Gree U-MATCH GUHD09NK3CO - Page 157

A/A DC INVERTER U-MATCH AIR CONDITIONERS MAINTENANCE
154
3. Remove the 4-way
valve
● Use gas welding to
heat the pipes
connected on the four
opennings of 4-way
valve. Then, pull them
out from 4-way valve.
● Before welding 4-way
valve, please record the
orientation of 4-way
valve and installing
position of each
opening.
4. Remove 4-way valve
● Remove the old 4-way
valve from the unit.
5. Connect the new
4-way valve to the pipe.
● Install the new 4-way
valve to correct position.
●When welding the
4-way valve, please
wrap the valve body with
wet cloth, thus to
prevent the guide inside
the valve body from
burn. Also take care to
prevent any water from
flowing into the pipe.
● Weld by charging
nitrogen, with the
nitrogen pressure kept at
0.5±0.1kgf/c(relative
pressure).
6.Establish vacuum
inside the system
through liquid valve.
● Establish vacuum
inside the system
through liquid valve.