19
Water has a molecular size of 2.8 Ångström. Accordingly, molecular sieves with a pore size of 3 Ångström
should be suitable for normally used refrigerants.
MS with a pore size of 3 Ångström can be supplied by the following:
Driers with the following amount of desiccants are recommended:
Compressor Filter drier
P and T 6 gram or more
F and N 10 gram or more
SC 15 gram or more
In commercial systems, larger solid core driers are often
used. These are to be used for the refrigerants according to
the manufacturers instructions. If a burn-out filter is needed
in a repair case, please contact the supplier for more detailed
information.
Special care should be taken when brazing the capillary tube. When mounting the capillary tube it should
not be pushed too far into the drier, thus touching the gaze or filter disc, causing a blockage or restriction.
If, on the other hand, the tube is only partly inserted into the drier, blockage could occur during the brazing.
This problem can be avoided by making a “stop” on the capillary tube with a pair of special pliers as shown:
4.11
Driers and refrigerants
4.12
Capillary tube in drier
UOP Molecular Sieve Division, USA
(earlier Union Carbide)
4A-XH6 4A-XH7 4A-XH9
R12 x x x
R22, R502 x x
R134a, R404A x x
HFC/HCFC blends x
R290, R600a x x
Grace Davision Chemical, USA
574 594
R12, R22, R502 x x
R134a x
HFC/HCFC blends x
R290, R600a x
CECA S.A., France
NL30R Siliporite H3R
R12, R22, R502 x x
R134a x x
HFC/HCFC blends x
R290, R600a x
(3/16”)
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