Brochure

Catalog CIC-2003-1/US
Filter Dryers
Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
21
Filter
Dryers
Introduction to Dryers Filter Dryers
Steel vs. Copper
The major differences in using steel versus copper
dryers are the system sizes and applications. Copper
dryers are normally used in smaller systems, systems
with less pressure fluctuations and lower vibration
tendencies. Some smaller systems do not require high
filtration capabilities; however, some of the smaller
systems using the new refrigerants will require better
filtration. In order to meet these requirements a core
dryer and dryers with additional filter media, besides a
screen, should be used. Also, copper is typically the
most economical option for smaller systems. Because
copper dryers are used for smaller applications, the
refrigerant charge required will generally be smaller
than in the steel dryer. In order to determine how much
desiccant is required to properly remove the moisture
in a system, information regarding the total amount of
refrigerant charge is required. When used in conjunc-
tion with system horsepower, maximum operating
temperature and maximum operating pressure, the
total system moisture can be calculated. The total
system moisture information is used to determine
adequate dryer capacity.
Information regarding operating pressure is required to
adequately size the wall thickness of the dryer to attain
the ultimate burst pressure, for both copper and steel.
In accordance with Underwriters Laboratories (UL) and
the Canadian Standards Association (CSA), the burst
pressure is rated as five times the design working
pressure of the system, or as three times the design
working pressure of the system along with a fatigue
stress test, as per UL 1995. Typically, for copper dryers,
the design working pressure value can be correlated
to tube diameter and wall thickness in order to meet
specific UL specifications.
TABLE 4
Refrigerant Lubricant
R-12 Alkylbenzene and Mineral Oil
R-22 Alkylbenzene and Mineral Oil
R-134a POE (Polyolester)
R-401A Alkylbenzene/POE (Polyolester)
R-401B Alkylbenzene/POE (Polyolester)
R-401C POE (Polyolester)
R-402A Alkylbenzene/POE (Polyolester)
R-402B Alkylbenzene/POE (Polyolester)
R-404A POE (Polyolester)
R-407A POE (Polyolester)
R-407B POE (Polyolester)
R-407C POE (Polyolester)
R-410A POE (Polyolester)
R-502 POE (Polyolester)
R-507A POE (Polyolester)
Courtesy Allied Signal