Gree GRS-Cm28/NaA-M - Page 72

Chapter Ⅳ Maintenance（3. Maintenance of Key Parts）
70
3 、
Assemble and
weld the
connection
pipe of
gas-liquid
separator. Add
nitrogen during
welding for
protection.
● Use soldering gun to
weld the pipes;
● Note: Add nitrogen
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.
3.2.1.3 Tube in tube heat exchanger
Removal/ Installation of tube in tube condenser
Remarks: Check the refrigerant system and each circuit. After making sure that it is necessary to
replace the tube in tube condenser, disconnect power and reclaim the refrigerant.
Step
Figure
Operation Instructions
1、Reclaim
the refrigerant
and remove the
fluorine
connection pipe
and waterway
connection pipe
of the tube in
tube heat
exchanger.
● Disconnect power of
the unit;
● Retrieve the
refrigerant;
● Disconnect the fluorine
connection pipe by using
the soldering gun. Twist
off the waterway
connection pipe.