GE PTV15SAMR, Technician Service Manual

Page: 46 / 85

Page 46
XI. SPECIAL EDITION ON MAINTENANCE OF ENVIRONMENTAL PROTECTION
REFRIGERATOR
Note :
• The tool used for HFC-134a System must be
exclusive, such as the fast coupling, vacuum
pump, guide tube of pressure gauge, valve, etc.
Use alcohol to clean the new parts and the use
of oil is prohibited.
• Compressor
The dryer must be specially used for HFC-134a
and the process from unpacking to welding and
vacuum extracting must be completed within 15
minutes.
• Cautions in case of freon leakage of the
freezing system:
i. In case of freon leakage, the entire set of
compressor and dryer must be replaced.
ii. The lower pressure side and the higher
pressure side at the freon leakage must be
completed exchanged.
iii. Sequence of nitrogen welding:
- Remove the compressor and dryer.
- Secure the compressor on the base
board.
- Connect all other tubing in addition to
the connection part of dryer and capillary
tube.
- Connect the nitrogen tank to the filling
tank of compressor at the pressure of
80¡Ñ10 4 pa (approx. 8kg/cm 2 ) and fill in
the nitrogen for 3-5 seconds (as
indicated in the figure).
- Weld all other tubing in addition to the
connection part of dryer and capillary
tube.
- Weld the tubing connected to the dryer
and capillary tube.
- Engage the filling tank of compressor
with the nitrogen tank at the pressure of
100x10 4 pa (approx. 10kg/cm 2 ) and then
use soap water to test any leakage.
iv. In case of leakage, wipe out the soap water
being applied on the leakage and reduce
the nitrogen pressure to prevent water from
getting into the piping.
v. If the concurrent welding of all the tubing is
impossible, then fill the nitrogen in the lower
and higher pressure sides respectively. For
the flowing direction, please refer to Fig. 2,
3.
vi. The cleansing flux cannot be used for the
welding to avoid water getting into the
freezing system and causing defective
result.
Fig. 1 Various shapes of tubes guided from the
compressor
Capillary tube
Discharge tube
Suction tube
Base board
Dryer
L H