Gree GRS-Cm28/NaA-M - Page 75

Chapter Ⅳ Maintenance（3. Maintenance of Key Parts）
73
3.2.1.5 4-way valve
Removal/ Installation of 4-way valve
Remarks: Before replacing, cut off the power and reclaim refrigerant.
Step
Figure
Operation Instructions
1 、 Reclaim
the refrigerant.
Before removing
the valve, record
its direction.
Even for a
dual-system, do
not refer to the
other system for
valve direction.
● Reclaim the
refrigerant;
● Before removing the
4-way valve, please
remember the installed
direction of the valve;
● Remove the coil;
● In order to guarantee
the integrity of 4-way
valve and for future
disassembly analysis,
wrap the 4-way valve
with wet cloth before
welding;
● Remove the 4-way
valve by welding.
2、Clean the
system
accordingly.
Replace the
4-way valve with
the same model.
Pipe connection
should also be
consistent with
the original
connection of
4-way valve.
● In principle, model of
the new valve should be
the same as the
replaced one. In special
cases where same
model cannot be
guaranteed, please ask
professional technicians
for confirmation;
● Wrap the 4-way valve
with wet cloth;
● Connect the valve with
the 4 pipes according to
the original direction of
valve coil;
● Weld the pipes with
soldering gun;
● Remember to charge
nitrogen when welding.
3 、 Retain
system pressure,
vacuumize and
recharge
refrigerant.
——
● Detect system
leakage;
● Make sure the vacuum
degree reaches -1.0bar;
● Type and amount of
refrigerant should accord
with requirements on
unit‟s nameplate.