Electrolux EILFU17GS, Technical & Service Manual

Page: 34 / 96

4-12
R Re effrriig ge erra attiio on n S Sy ys stte em m
V Ve erriiffy y R Re effrriig ge erra an ntt T Ty yp pe e IIn n T Th he e S Sy ys stte em m
D De ed diic ca atte ed d E Eq qu uiip pm me en ntt
R-134a must not be mixed with other types of
refrigerants. R-134a must be recovered in
dedicated and properly identified recovery bags
and tanks.
It will be necessary to check with the manufacturer
of your recovery equipment to determine R-134a
compatibility. Some recovery equipment
manufacturers have changeover instructions for
switching between refrigerant types. Protect
yourself and your equipment by following all
manufacturer guidelines.
Also, ensure that your refrigeration hoses are
specified for use with R-134a refrigerant.
Research has shown that compounds in standard
refrigeration hoses may enter sealed systems and
ultimately restrict the cap tube in an R-134a
system.
R R--1 13 34 4a a R Re effrriig ge erra attiio on n S Sy ys stte em ms s
The sealed refrigeration system will consist of the
same basic components being utilized in the R-12
systems.
There is a 10% to 15% discharge pressure
increase using R-134a, with a 5% to 10%
decrease in suction pressure when compared to
the same product with an R-12 system operating
at 90°F (32°C) ambient temperature conditions.
Lower suction pressures result from the lower
density of R-134a refrigerant which effects
refrigerant flow rate. R-134a systems commonly
operate in a 1”-2” vacuum on the suction side.
Products using R-134a refrigerant will generally
have a longer capillary tube to maintain a similar
flow rate and some models will have a larger
condenser to reduce the discharge pressures and
lower start-up sound transmission.
M Miis sc ciib biilliitty y o off R R--1 13 34 4a a a an nd d E Es stte err O Oiill
A special synthetic oil known as Ester oil is used
as a lubricant in refrigeration systems operating on
R-134a. Ester oils are produced from alcohols and
fatty acids and are available in several different
variants. Ester oils have a pleasant aroma
reminiscent of fruit.
Ester oils generally include various types of
additives for improving certain properties such as
viscosity, temperature sensitivity, etc. These
additives are often aggressive, and skin contact
with Ester oils should therefore be avoided.
One of the most important requirements made on
a refrigerant system is that the oil mix with the
refrigerant. Since mineral oil and ordinary synthetic
oil DO NOT mix with R-134a, Ester oil is used for
lubrication. Ester oil dissolves in R-134a.
Ester oil is broken down by chlorine and cannot be
used with R-12 (R-12 contains chlorine) or any
other compound containing chlorine. Therefore,
R-134a refrigeration systems have virtually no
tolerance for chlorine molecules from CFC
refrigerants (R-134a is an HFC and contains no
chlorine).
NOTE
IIn ns sttrru uc cttiio on ns s g giiv ve en n h he erre e a arre e ffu urrn niis sh he ed d a as s a a
g gu uiid de e.. P Pe errs so on ns s a atttte em mp pttiin ng g tto o u us se e tth he es se e
iin ns sttrru uc cttiio on ns s tto o m ma ak ke e rre ep pa aiirrs s tto o tth he e s se ea alle ed d
rre effrriig ge erra attiio on n s sy ys stte em m s sh ho ou ulld d h ha av ve e a a w wo orrk kiin ng g
k kn no ow wlle ed dg ge e o off rre effrriig ge erra attiio on n a an nd d p prre ev viio ou us s ttrra aiin niin ng g
o on n s se ea alle ed d s sy ys stte em m rre ep pa aiirr..
CAUTION
R R--1 13 34 4a a a an nd d R R--1 12 2 a arre e c co om mp plle ette elly y iin nc co om mp pa attiib blle e..
B Be effo orre e s stta arrttiin ng g a an ny y s se ea alle ed d s sy ys stte em m rre ep pa aiirr,, iitt iis s
e ex xttrre em me elly y iim mp po orrtta an ntt tto o c ch he ec ck k s se erriia all p plla atte e o off
p prro od du uc ctt tto o v ve erriiffy y tth he e tty yp pe e o off rre effrriig ge erra an ntt iin n tth he e
s sy ys stte em m..
CAUTION
D Du urriin ng g R R--1 13 34 4a a s se errv viic ce e,, iitt iis s e ex xttrre em me elly y iim mp po orrtta an ntt
tto o a av vo oiid d u us siin ng g e eq qu uiip pm me en ntt tth ha att m ma ay y c co on ntta aiin n
rre es siid du ua all a am mo ou un ntts s o off m miin ne erra all o oiill,, C CF FC C’’s s o orr
H HC CF FC C’’s s w wh hiic ch h c co ou ulld d e en ntte err a an nd d c co on ntta am miin na atte e tth he e
s se ea alle ed d s sy ys stte em m..