Brochure

Catalog CIC-2003-1/US
Filter Dryers
Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
39
Filter
Dryers
FIGURE 1 - R410A Steel Liquid Line Dryer Filtration.
(Note: 4 PSID is the baseline Parker uses when
determining filtration capacity.)
FIGURE 2 - R410A Heat Pump Dryer Filtration. (Note: 4
PSID is the baseline Parker uses when determining
filtration capacity.)
Guidelines for Parker Dryers and R-410A R-410A Guidelines and Dryers
FIGURE 3 - Water capacity of different desiccants in R-22
at 140°F. (Note: MOLSIV 4A-HX-6 is a trade name of
UOP.)
addition of seven grams of contaminant, while the
Parker dryer holds 23 grams before reaching the same
pressure drop. At the same time, filtration capability,
the ability to remove small particles, has not been
compromised. In the same test, Parker dryers have
filtration efficiencies up to 95%, which is a requirement
for R-410A dryers.
The same filtration performance has been designed
into bi-directional dryers for heat pumps. Figure 2
shows the results of testing of a standard bi-directional
dryer and the Parker R-410A bi-directional dryer. The
standard dryer holds 4 grams of contaminant while the
R-410A specific dryer holds 36 grams of contaminant
before reaching 4 psi pressure drop.
The desiccant (drying agent) used in the dryer had to
be developed to be able to adsorb water and
exclude R-32. This new desiccant is UOP's XH11. This
is the desiccant that is used exclusively in Parker's R-
410A liquid line dryers. The pore openings are specifi-
cally designed to adsorb moisture while excluding the
R-32, lubricant and additives. This insures maximum
water capacity in the dryer and allows the water to be
physically separated from the POE lubricant to prevent
hydrolysis. Activated alumina on the other hand has
pore openings that will adsorb not only the water but
the R-32, POE lubricant and it's additives, which lowers
it's drying capabilities and removes essential additive's
from the lubricant. It also gives the water and the lubri-
cant a surface for the hydrolysis reaction since they can
co-exist in the alumina's openings. The water is not
physically separated from the lubricant.
Figure 3 displays the water capacity of different
desiccants in R-22. It can be seen from this graph that
molecular sieve 4A-XH-6 has approximately 3-4 times
higher water capacity than activated alumina and silica
gel.
Figure 4 shows the water capacity for different molecu-
lar sieve desiccants in R-410A. The steepness of the
XH11 curve at low levels of water shows its high water
capacity at low water levels. This means that it takes
less XH11 than other sieve desiccants to dry refriger-
ants to low levels of water.
FIGURE 4 - Water capacity of different desiccants in
R-410A at 125°F. (Note: XH-11 and HX-6 are trade names
of UOP.)