GE TBG440ANDR, Техническое руководство по обслуживанию

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Page 32
VIII. MAINTENANCE OF ENVIRONMENTAL PROTECTION REFRIGERATOR
8.2.2 The Change of Compressor Oil
The original Naphten type of mineral oil
and Olefines type of syntheic 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 producted
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 sobubility 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 ,ist clogging. Therefore, it
is prohibited to use the current tools
(for R-12, R-22, R502); instead,
thenew 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 cooper 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.