GE PTV15SAMR, Техническое руководство по обслуживанию

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Page 43
XI. SPECIAL EDITION ON MAINTENANCE OF ENVIRONMENTAL PROTECTION
REFRIGERATOR
11.2.2 The change of compressor oil
The original Naphten type of mineral oil
and Olefines type of synthetic oil have
now been changed to Ester oil.
i. Vacuum treatment must be
conducted within 15 minutes after
opening the sealing plastic
membrane of compressor, dryer and
capillary tube to avoid the invasion of
water. The Ester type of oil has a
stronger water absorption power
capable of absorbing 200 ppm of
saturated moist, which is 40 times
more than the original oil.
The acid reaction will be produced for
water from the Ester oil and this type
of acid will display metallic chloride
reaction for the metal, which tends to
clog the capillary tube. Thus, special
care should be drawn to the time
duration after opening the sealed
compressor and dryer (treatment
must be conducted within 15
minutes).
ii. The tool used for HFC-134a freon
system must be exclusive and the
new parts material must be firstly
cleaned before use. The Ester used
for HFC-134a contains 10ppm~
20ppm of solubility which is lower than
the original product (the CFC-12 for
compressor oil, joint, pressure gauge,
anti-rust oil). When mixing with the
original oil system, the residues will
be separated from the capillary tube
that has formed the cause of moist
clogging. Therefore, it is prohibited to
use the current tools (for R-12, R-22,
R50); instead, the new and special
tools for HFC-134a are used together
with HFC-134a Ester oil as well. (For
the freon container, freon filling tank,
coupling, pressure gauge, valve,
tubes, compound pressure gauge,
vacuum pump, tube cutter, fast
coupling, etc. the mixing of the original
system oil should be avoided).
In addition, the tools for the new
product must be cleaned by Alcohol.
It should be noted that even the
mixture of few grams of oil will
deteriorate the function of the freezing
system.
iii. The use of flux is prohibited for
welding:
Water may seep into the system
when the water soluble flux is used
for welding, so it is prohibited to use.
Basically, the copper tube and iron
tube welding will be avoided as much
as possible and if necessary, fresh
water will be used to dissolve it. To
prevent the fluochlorine of tap water
from getting into the freezing system,
the cleaning flux should be prevented
from seeping into the freezing
system.