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R R e e f f r r i i g g e e r r a a t t i i o o n n S S y y s s t t e e m m
NOTE
I I n n s s t t r r u u c c t t i i o o n n s s g g i i v v e e n n h h e e r r e e a a r r e e f f u u r r n n i i s s h h e e d d a a s s a a
g g u u i i d d e e . . P P e e r r s s o o n n s s a a t t t t e e m m p p t t i i n n g g t t o o u u s s e e t t h h e e s s e e
i i n n s s t t r r u u c c t t i i o o n n s s t t o o m m a a k k e e r r e e p p a a i i r r s s t t o o t t h h e e s s e e a a l l e e d d
r r e e f f r r i i g g e e r r a a t t i i o o n n s s y y s s t t e e m m s s h h o o u u l l d d h h a a v v e e a a w w o o r r k k i i n n g g
k k n n o o w w l l e e d d g g e e o o f f r r e e f f r r i i g g e e r r a a t t i i o o n n a a n n d d p p r r e e v v i i o o u u s s t t r r a a i i n n i i n n g g
o o n n s s e e a a l l e e d d s s y y s s t t e e m m r r e e p p a a i i r r . .
V V e e r r i i f f y y R R e e f f r r i i g g e e r r a a n n t t T T y y p p e e I I n n T T h h e e S S y y s s t t e e m m
CAUTION
R R - - 1 1 3 3 4 4 a a a a n n d d R R - - 1 1 2 2 a a r r e e c c o o m m p p l l e e t t e e l l y y i i n n c c o o m m p p a a t t i i b b l l e e . .
B B e e f f o o r r e e s s t t a a r r t t i i n n g g a a n n y y s s e e a a l l e e d d s s y y s s t t e e m m r r e e p p a a i i r r , , i i t t i i s s
e e x x t t r r e e m m e e l l y y i i m m p p o o r r t t a a n n t t t t o o c c h h e e c c k k s s e e r r i i a a l l p p l l a a t t e e o o f f
p p r r o o d d u u c c t t t t o o v v e e r r i i f f y y t t h h e e t t y y p p e e o o f f r r e e f f r r i i g g e e r r a a n n t t i i n n t t h h e e
s s y y s s t t e e m m . .
D D e e d d i i c c a a t t e e d d E E q q u u i i p p m m e e n n t t
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 1 3 3 4 4 a a R R e e f f r r i i g g e e r r a a t t i i o o n n S S y y s s t t e e m m s 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 M i i s s c c i i b b i i l l i i t t y y o o f f R R - - 1 1 3 3 4 4 a a a a n n d d E E s s t t e e r r O O i i l l
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).
CAUTION
D D u u r r i i n n g g R R - - 1 1 3 3 4 4 a a s s e e r r v v i i c c e e , , i i t t i i s s e e x x t t r r e e m m e e l l y y i i m m p p o o r r t t a a n n t t
t t o o a a v v o o i i d d u u s s i i n n g g e e q q u u i i p p m m e e n n t t t t h h a a t t m m a a y y c c o o n n t t a a i i n n
r r e e s s i i d d u u a a l l a a m m o o u u n n t t s s o o f f m m i i n n e e r r a a l l o o i i l l , , C C F F C C ' ' s s o o r r
H H C C F F C C ' ' s s w w h h i i c c h h c c o o u u l l d d e e n n t t e e r r a a n n d d c c o o n n t t a a m m i i n n a a t t e e t t h h e e
s s e e a a l l e e d d s s y y s s t t e e m m . .
4-12
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