GE PTV15SAMR, Technician Service Manual

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Page 48
XI. SPECIAL EDITION ON MAINTENANCE OF ENVIRONMENTAL PROTECTION
REFRIGERATOR
11.3.3 Sequence of extracting vacuum and
filling nitrogen
i. Vacuum Extraction
ΠVacuum extraction (5 min.)
 Freon filling (50 g)
Ž Vacuum extraction (20 min)
 Freon filling (presumed amount).
No reverse flow of the vacuum pump
oil. The power of vacuum pump cannot
be switched off until the operation of
the aforesaid Œ ~ Ž is completed
(continuous vacuum extraction
without pause).
Please operate by the following
sequence
(Compound Pressure Gauge
Specially Used for HFC-134a)
Fig. Sequence of valve operation
Each valve means the operational sequence:
- Means the closed condition of valve
- Means the opened condition of valve
CB (liquid side)
Diversified tube at the
dryer side
To the filling tube
of compressor
LB VB HB
A
Filling tank
Vacuum pump
L H
ii. Preparations
a. Fill the freon in the freon filling
tank. The required filling
50g + a
Note : The air in the freon
filling tank and the
connecting tube
must be
discharged.
b. By the connection method
shown on the right side figure,
close all the valves.
c. Connect the compressor to
the starter and the overload
protector, making it operable.
Freon tank
Filling tank
CB CA