GE PTG440SAMR, Technician Service Manual

Page: 45 / 85

Page 45
XI. SPECIAL EDITION ON MAINTENANCE OF ENVIRONMENTAL PROTECTION
REFRIGERATOR
11.3.2 Reactions for HFC-134a
i. Upon welding the tube, blow with
nitrogen to avoid the capillary tube
clogging by the oxidized membrane.
ii. Aiming at the improvement of vacuum
degree for the vacuum pump of
pressure gauge, install additional
valves for the equipment using bolt to
keep non-condense air from getting
in.
iii. Shorten the service time as indicated
in the figure. Operate by the tubing
type as shown on the figure below:
1 st time vacuum extracting (5 min.)
Fill the freon in (50 gr)
2 nd time vacuum extracting (20 min.)
Fill the freon in (req’d amount)
Compound
Pressure Gauge
Additional valve
Freon filling tank
H pressure
tube
L pressure
tube
Freon tank
Vacuum pump
L H
iv. The tool cannot be used together with
the existing CFC-12. So the tool
must be re-ordered to avoid incorrect
use. Each connecting part will be
changed from 1/4 inch to 3/8 inch.