Gree GRS-Cm28/NaA-M - Page 76

Chapter Ⅳ Maintenance（3. Maintenance of Key Parts）
74
Removal/ Installation of electronic expansion valve
Remarks: Check the refrigerant system and each circuit. After making sure that it is necessary
to replace electronic expansion valve, disconnect power and reclaim the refrigerant.
Step
Figure
Operation Instructions
1、Reclaim
the refrigerant.
● Disconnect power of
the unit;
● Reclaim the
refrigerant.
2、Remove
the electronic
expansion
valve.
● In order to protect the
EXV, wrap it with wet
cloth during welding;
● Remove the EXV by
using the soldering gun.
3、Replace
with a new
electronic
expansion
valve.
● Replace with a new
EXV that is of the same
model;
● Wrap the EXV with wet
cloth and mount it on.
Connect the connection
pipe;
● Weld it with soldering
gun;
● Note: Add nitrogen into
the pipe when welding.
4 、 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.