DEHYDRATORS AND FILTERS

91
 DEHYDRATION OF REFRIGERANTS

Among contaminating agents causing In molecular sieve driers, with a charge

serious damages to refrigerating systems, constituted by non-agglomerated
moisture plays a major role. Its presence, products, the dehydrating mass is pressed
even possible in the refrigerating system, in between two fine steel mesh disks, or
is due to many factors: two filtering disks of various material, kept
• inadequate or insufficiently prolonged in place by a spring.
vacuum before refrigerant charging; In solid core driers, dehydrating and
• oil used for topping up remained deacidifying products with binders
exposed to air humidity; constitute the block. Water adsorption
• refrigerant used for subsequent combines with the neutralization of acids
additions contained in non dried that may be present in the refrigerant, and
vessels; with a strong filtering action.
• sealing defects especially in systems Castel have planned either its production
not designed for operation at low lines of hermetic driers on this second
temperatures. solution that avoid any risk of abrasion of
High temperatures combined with the charge and consequently the making
humidity give rise to complex phenomena of powder and permit to put the filter in
enhancing acid formation both in any position inside the refrigerating
lubricating oil and refrigerant. system.
Oil organic acids react with metal and It is always advisable to install a moisture
favor the formation of sludge, which are indicator downstream the filter, which will
viscous clots consisting of insoluble metal show the refrigerant moisture and,
salts and large molecules of polymerized consequently, the degree of efficiency of
oil. the filter.
Sludge affects the lubrication of the The dehydrating capacity of Castel drier is
moving elements of the compressor, can relative to the charge of refrigerant and not
clog valves and filters and cause serious to the refrigeration potential of the plant.
damages. As a matter of fact, for the same
Acids, especially hydrofluoric acid, refrigerant potential and for the same type
produced by the hydrolysis of the of refrigerant fluid, there can be different
fluorinated refrigerant (in compressors iron refrigerant charges according to the type,
and aluminum act as catalysts) are design and working conditions of the plant
particularly corrosive. as well as to the shutter degree.
Acids etch metal surfaces with the The data shown in the following tables are
consequent formation of crystal salts, deduced from the test results of the
which stick to surfaces and affect the total present Castel production.
heat exchange coefficient in the It is important to note in the case of a high
condenser and in the evaporator. oil level in the circuit (> 5%) the data
In the sealed and semi-sealed groups, shown in the tables will be reduced
these salts damage the windings of considerably.
electric motors as in these groups cold
gas cools windings through direct contact.
On the other hand, water solubility in
refrigerants in a liquid phase, is quite
reduced, especially at low temperatures.
As a consequence, when in the system
water exceeds the very low limits of
solubility admitted at low temperature,
excess water turns into ice, and blocks
expansion valves and capillaries either
partially or totally.
Consequently, refrigerating plants must be
equipped with a filter drier on the liquid
line and types available on the market are
essentially two: molecular sieve driers and
solid core driers.

92 www.castel.it
ANTI-ACID SOLID CORE FILTER DRIERS WITH

DEHYDRATORS AND FILTERS

MOLECULAR SIEVES AND ACTIVATED ALUMINA –
SERIES 42
Approved by Underwriters Laboratories Inc. u

SOLID CORE FILTER DRIERS WITH 100%

MOLECULAR SIEVES – SERIES 43
Approved by Underwriters Laboratories Inc. u

APPLICATIONS The blocks in the filters series 42 are

molded from a blend of dehydrating
The filters, shown in this chapter, are charge, 80% of 3 Å molecular sieves
classified “Pressure vessels” in the and 20 % of activated alumina, and a
sense of the Pressure Equipment special binding agent in appropriate
Directive 94/23/EC, Article 1, Section proportions. The choice of blend,
2.1.1 and are subject of Article 3, molecular sieves – activated alumina,
Section 1.1 of the same Directive. gives to the block a very high capacity
They are designed for installation on of acid adsorption also maintaining very
commercial refrigerating systems and good dehydrating characteristics. The
on civil and industrial conditioning presence of a controlled and defined
plants, which use refrigerant fluids percentage of activated alumina, lower
proper to the Group II (as defined in than the maximum value recommended
Article 9, Section 2.2 of Directive by ASERCOM, keeps unchanged the
97/23/EC and referred to in Directive original concentration of additives in the
67/548/EEC). polyolester lubricant.
Filters series 42 and series 43 have
been developed for specific installations
on refrigerating systems using HFC
refrigerant fluids, particularly R134a,
R404A, R407C, R410A ed R507 mixed
with polyolester lubricants. In spite of
this, the new block may be successfully
used also in refrigerating systems using
the old CFC or HCFC refrigerant fluids,
mixed with mineral lubricants

CONSTRUCTION
The filter is completely manufactured in
steel, either with nickel-plated Flare
threaded connections. The product
range also includes types with copper
plated solder connections, offering the
possibility to solder the copper pipe
inside the connections (ODS) or outside
the connections, using a copper sleeve
(ODM).
On specific customers’ request, Castel
is also able the supply them filters
series 42 and 43 with:
• solder connections made of copper
tube EN 12735-1 – Cu-DHP
• ORFS (O-Ring Face Seal) threaded
connections according to SAE J 1453
Standard.

www.castel.it 93
 The blocks in the filters series 43 are EXAMPLE OF SELECTION
molded from a blend of dehydrating
charge, totally made of 3 Å molecular System data:
sieves, and a special binding agent in Refrigerant: R407C
appropriate proportions. The choice of Condensing temperature: + 50 [°C]
the 3 Å molecular sieves, as sole Weight of refrigerant: 34 [kg]
dehydrating material, gives to the block
a superlative capacity of water According to DIN 8949:2000, the adsorption
adsorption also maintaining quite good capacity of the drier is given by:
deacidifying characteristics.
The manufacturing process gives a (1.050 – 50) x 34 / 1.000 = 34 g of H2O
considerable compacted ness and
stoutness to both the products so that where:
they are resistant to shocks and
abrasions. 1.050 ppm. = moisture in the refrigerant
The shape of the block is designed in entering the filter according to DIN
order to offer the maximum possible 8949:2000
surface area to the incoming fluid. The 50 ppm. = moisture in the refrigerant flowing
internal cavity is also positioned in such out the filter according to DIN 8949:2000
a way as to have a uniform wall
thickness. As a result, the fluid Comparing the absorption capacity required
encounters a constant strength at all with the values shown in table 2, drier
points, flows linearly through the block, mod.4032 should be selected, with a water
and ensures efficient dehydration and absorption capacity of 47,5 g at 50 °C.
minimum charge loss. If the dehydrating capacity of products is
The block is chemically inert, not expressed in water drops, it must be
deliquescent, does not react with remembered that:
refrigerating fluids, and is capable of
blocking oil by-products dragged into 1g H2O = 20 water drops
the circuit. Impurities accumulate in the
ring between the metal shell and the In this case and when a molecular sieve
block; this prevents filter clogging. drier is selected, the following result is
obtained:
34 x 20 = 680 water drops.

If moisture exceeds the values specified in

DIN 8949:2000, a drier with a higher
adsorption capacity shall be selected.
flow direction

Solid core dehydrator

1 – Spring
2 – Stainless steel mesh
3 – Block
4 – Felt

94 www.castel.it
 DEHYDRATORS AND FILTERS
TABLE 1: General Characteristics
Catalogue Connections TS [°C]
Number
Block Nominal Risk
High water capacity core (1) International Filtering Volume ODS ODM PS Category
Reference Surface [cm3] SAE [bar] according
[cm2] min. max. to PED
Threaded Solder Flare Ø Ø Ø Ø
Connections Connections [in.] [mm] [in.] [mm]

4303/2 – 032 1/4" – – – –

4303/2F (2) – – 1/4" – – – –
47 50
– 4303/2S 032S – 1/4" – 3/8" –
4303/3 – 033 3/8" – – – –
4305/2 – 052 1/4" – – – –
4305/2F (2) – – 1/4" – – – –
– 4305/2S 052S – 1/4" – 3/8" –
70 80
4305/3 – 053 3/8" – – – –
– 4305/3S 053S – 3/8" – 1/2" –
– 4305/M10S – – – 10 – 12
4308/2 – 082 1/4" – – – –
4308/2F (2) – – 1/4" – – – –
– 4308/2S 082S – 1/4" – 3/8" –
4308/3 – 083 3/8" – – – –
4308/3F (2) – – 3/8" – – – –
103 130
– 4308/3S 083S – 3/8" – 1/2" –
– 4308/M10S – – – 10 – 12
– 4308/M12S – – – 12 – 14
4308/4 – 084 1/2" – – – –
– 4308/4S 084S – 1/2" – 5/8" 16
4316/2 – 162 1/4" – – – –
4316/3 – 163 3/8" – – – –
4316/3F (2) – – 3/8" – – – – Art. 3.3
– 4316/3S 163S – 3/8" – 1/2" –
– 4316/M10S – – – 10 – 12 45
155 250 – 40 +80
– 4316/M12S – – – 12 – 14 (3)
4316/4 – 164 1/2" – – – –
– 4316/4S 164S – 1/2" – 5/8" 16
4316/5 – 165 5/8" – – – –
– 4316/5S 165S – 5/8" 16 3/4" –
4330/3 – 303 3/8" – – – –
– 4330/3S 303S – 3/8" – 1/2" –
4330/4 – 304 1/2" – – – –
310 500
– 4330/4S 304S – 1/2" – 5/8" 16
4330/5 – 305 5/8" – – – –
– 4330/5S 305S – 5/8" 16 3/4" –
4332/4 – 304 1/2" – – – –
– 4332/4S 304S – 1/2" – 5/8" 16
255 500
4332/5 – 305 5/8" – – – –
– 4332/5S 305S – 5/8" 16 3/4" –
4341/5 – 415 5/8" – – – –
– 4341/5S 415S – 5/8" 16 3/4" –
4341/6 – 416 330 670 3/4" – – – –
– 4341/6S 416S – 3/4" – 7/8" –
– 4341/7S 417S – 7/8" – 1.1/8" –
– 4375/4S 754S – 1/2" – 5/8" 16
– 4375/5S 755S – 5/8" 16 3/4" –
– 4375/6S 756S 660 1340 – 3/4" – 7/8" – I
– 4375/7S 757S – 7/8" – 1.1/8" –
– 4375/9S 759S – 1.1/8" – 1.3/8" 35

(1) 100% molecular sieves; (2) Male-female connections (Inlet female)

(3) PS = 400 psig in compliance with the UL approval

www.castel.it 95
 TABLE 2: General Characteristics
Catalogue Connections TS [°C]
Number
Block Nominal Risk
Anti-acid core (1) International Filtering Volume ODS ODM PS Category
Reference Surface [cm3] SAE [bar] according
[cm2] min. max. to PED
Threaded Solder Flare Ø Ø Ø Ø
Connections Connections [in.] [mm] [in.] [mm]

4203/2 – 032 1/4" – – – –

– 4203/2S 032S 47 50 – 1/4" – 3/8" –
4203/3 – 033 3/8" – – – –
4205/2 – 052 1/4" – – – –
– 4205/2S 052S – 1/4" – 3/8" –
70 80
4205/3 – 053 3/8" – – – –
– 4205/3S 053S – 3/8" – 1/2" –
4208/2 – 082 1/4" – – – –
– 4208/2S 082S – 1/4" – 3/8" –
4208/3 – 083 3/8" – – – –
103 130
– 4208/3S 083S – 3/8" – 1/2" –
4208/4 – 084 1/2" – – – –
– 4208/4S 084S – 1/2" – 5/8" 16
4216/2 – 162 1/4" – – – –
4216/3 – 163 3/8" – – – –
– 4216/3S 163S – 3/8" – 1/2" –
155 250
4216/4 – 164 1/2" – – – –
– 4216/4S 164S – 1/2" – 5/8" 16 Art. 3.3
4216/5 – 165 5/8" – – – –
– 4216/5S 165S – 5/8" 16 3/4" – 45
– 40 +80
4230/3 – 303 3/8" – – – – (2)
– 4230/3S 303S – 3/8" – 1/2" –
4230/4 – 304 1/2" – – – –
310 500
– 4230/4S 304S – 1/2" – 5/8" 16
4230/5 – 305 5/8" – – – –
– 4230/5S 305S – 5/8" 16 3/4" –
4232/4 – 304 1/2" – – – –
– 4232/4S 304S – 1/2" – 5/8" 16
255 500
4232/5 – 305 5/8" – – – –
– 4232/5S 305S – 5/8" 16 3/4" –
4241/5 – 415 5/8" – – – –
– 4241/5S 415S – 5/8" 16 3/4" –
4241/6 – 416 330 670 3/4" – – – –
– 4241/6S 416S – 3/4" – 7/8" –
– 4241/7S 417S – 7/8" – 1.1/8" –
– 4275/4S 754S – 1/2" – 5/8" 16
– 4275/5S 755S – 5/8" 16 3/4" –
– 4275/6S 756S 660 1340 – 3/4" – 7/8" – I
– 4275/7S 757S – 7/8" – 1.1/8" –
– 4275/9S 759S – 1.1/8" – 1.3/8" 35

(1) 80% molecular sieves + 20% activated alumina

(2) PS = 400 psig in compliance with the UL approval

96 www.castel.it
 DEHYDRATORS AND FILTERS
TABLE 3: Refrigerant Flow Capacity and Water Capacity

Refrigerant Flow Capacity, Water Capacity Dehydratable Charge Water Capacity Dehydratable Charge
pressure drop at + 25 °C (2) [g H2O] at + 25 °C at + 50 °C (2) [g H2O] at + 50 °C
Catalogue 0,07 bar (1) [kW] [kg refrigerant] [kg refrigerant]
Number

R407C

R407C

R407C

R407C

R407C
R404A

R410A

R404A

R410A

R404A

R410A

R404A

R410A

R404A

R410A
R134a

R134a

R134a

R134a

R134a
R507

R507

R507

R507

R507
R22

R22

R22

R22

R22
4303/2
6,5 7,0 4,6 6,9 7,0
4303/2F
4,1 3,8 4,2 3,4 3,7 4,4 4,0 4,5 3,6 3,9 3,5 3,0 3,9 2,7 2,9 3,8 3,2 4,2 2,9 3,2
4303/2S 8,0 8,6 5,6 8,5 8,6
4303/3 14,9 16,1 10,5 16,0 16,2
4305/2
6,7 7,2 4,7 7,1 7,2
4305/2F
4305/2S 8,2 8,9 5,8 8,8 9,0
7,3 6,7 7,4 6,0 6,5 7,8 7,2 8,0 6,4 7,0 6,3 5,3 6,9 4,8 5,2 6,8 5,7 7,4 5,2 5,6
4305/3 15,4 16,6 10,8 16,5 16,7
4305/3S
19,4 21,0 13,7 20,8 21,2
4305/M10S
4308/2
6,9 7,5 4,9 7,4 7,5
4308/2F
4308/2S 8,5 9,2 6,0 9,1 9,3
4308/3
18,0 19,5 12,7 19,3 19,6
4308/3F
12,7 11,6 13,0 10,4 11,3 13,7 12,5 13,9 11,2 12,2 10,9 9,3 12,0 8,4 9,1 11,8 10,0 13,0 9,0 9,8
4308/3S
22,8 24,7 16,1 24,5 24,8
4308/M10S
4308/M12S 29,0 31,3 20,4 31,0 31,4
4308/4 24,0 25,9 16,9 25,7 26,0
4308/4S 29,0 31,3 20,4 31,0 31,4
4316/2 6,9 7,5 4,9 7,4 7,5
4316/3
19,7 21,3 13,9 21,1 21,4
4316/3F
4316/3S
24,6 26,6 17,3 26,4 26,7
4316/M10S
25,1 22,9 25,6 20,5 22,3 27,0 24,6 27,5 22,0 24,0 21,6 18,4 23,8 16,5 18,0 23,2 19,8 25,6 17,7 19,4
4316/M12S 34,1 36,9 24,0 36,6 37,0
4316/4 28,2 30,5 19,9 30,3 30,6
4316/4S 34,1 36,9 24,0 36,6 37,0
4316/5 37,6 40,6 26,4 40,3 40,8
4316/5S 45,0 48,7 31,7 48,3 48,9
4330/3 21,7 23,4 15,3 23,2 23,5
4330/3S 27,1 29,3 19,0 29,0 29,4
4330/4 30,9 33,4 21,8 33,2 33,5
50,2 45,8 51,2 41,0 44,6 54,0 49,2 55,1 44,1 48,0 43,2 36,8 47,6 33,0 36,0 46,5 39,6 51,2 35,5 38,7
4330/4S 37,3 40,4 26,3 40,0 40,5
4330/5 38,8 41,9 27,3 41,6 41,9
4330/5S 46,6 50,4 32,8 50,0 50,6
4332/4 33,6 36,3 23,6 36,0 36,4
4332/4S 40,5 43,8 28,5 43,4 44,0
45,4 41,4 46,4 37,2 40,5 48,8 44,5 49,9 40,0 43,5 39,1 33,2 43,1 29,9 32,6 42,0 35,7 46,3 32,2 35,1
4332/5 39,9 43,1 28,1 42,8 43,0
4332/5S 48,2 52,1 33,9 51,7 52,3
4341/5 40,9 44,2 28,8 43,8 44,4
4341/5S 49,5 53,5 34,8 53,1 53,7
4341/6 61,4 56,1 62,8 50,3 54,7 66,0 60,3 67,5 54,1 58,8 53,0 45,0 58,3 40,5 44,1 57,0 48,4 62,7 43,5 47,4
67,2 72,6 47,3 72,0 73,0
4341/6S
4341/7S 74,2 80,2 52,2 79,6 80,5
4375/4S 53,4 57,7 37,5 57,3 57,9
4375/5S 54,5 58,9 38,3 58,4 59,1
4375/6S 80,6 87,1 56,8 86,4 87,6 122,8 112,2 125,6 100,6 109,4 132,0 120,6 135,1 108,2 117,6 106,0 90,0 116,6 81,0 88,2 114,0 96,8 125,4 87,1 94,8
4375/7S 92,8 100,3 65,3 99,5 100,6
4375/9S 96,5 104,3 67,9 103,5 104,7

(1) (2) See caption on page 98.

www.castel.it 97
 TABLE 4: Refrigerant Flow Capacity and Water Capacity

Refrigerant Flow Capacity, Water Capacity Dehydratable Charge Water Capacity Dehydratable Charge
pressure drop at + 25 °C (2) [g H2O] at + 25 °C at + 50 °C (2) [g H2O] at + 50 °C
Catalogue 0,07 bar (1) [kW] [kg refrigerant] [kg refrigerant]
Number

R407C

R407C

R407C

R407C

R407C
R404A

R410A

R404A

R410A

R404A

R410A

R404A

R410A

R404A

R410A
R134a

R134a

R134a

R134a

R134a
R507

R507

R507

R507

R507
R22

R22

R22

R22

R22
4203/2 6,5 7,0 4,6 6,9 7,0
4203/2S 8,0 8,6 5,6 8,5 8,6 3,5 3,2 3,6 2,9 3,1 3,8 3,4 3,9 3,1 3,4 3,0 2,6 3,3 2,3 2,5 3,3 2,8 3,6 2,5 2,7
4203/3 14,9 16,1 10,5 16,0 16,2
4205/2 6,7 7,2 4,7 7,1 7,2
4205/2S 8,2 8,9 5,8 8,8 9,0
6,2 5,7 6,3 5,1 5,5 6,7 6,1 6,8 5,5 6,0 5,4 4,5 5,9 4,1 4,5 5,8 4,9 6,3 4,4 4,8
4205/3 15,4 16,6 10,8 16,5 16,7
4205/3S 19,4 21,0 13,7 20,8 21,2
4208/2 6,9 7,5 4,9 7,4 7,5
4208/2S 8,5 9,2 6,0 9,1 9,3
4208/3 18,0 19,5 12,7 19,3 19,6
10,8 9,9 11,0 8,8 9,6 11,6 10,6 11,9 9,5 10,3 9,3 7,9 10,2 7,1 7,7 10,0 8,5 11,0 7,7 8,3
4208/3S 22,8 24,7 16,1 24,5 24,8
4208/4 24,0 25,9 16,9 25,7 26,0
4208/4S 29,0 31,3 20,4 31,0 31,4
4216/2 6,9 7,5 4,9 7,4 7,5
4216/3 19,7 21,3 13,9 21,1 21,4
4216/3S 24,6 26,6 17,3 26,4 26,7
4216/4 28,2 30,5 19,9 30,3 30,6 21,3 19,5 21,8 17,4 19,0 22,9 20,9 23,4 18,7 20,4 18,4 15,6 20,2 14,0 15,3 19,7 16,8 21,8 15,1 16,5
4216/4S 34,1 36,9 24,0 36,6 37,0
4216/5 37,6 40,6 26,4 40,3 40,8
4216/5S 45,0 48,7 31,7 48,3 48,9
4230/3 21,7 23,4 15,3 23,2 23,5
4230/3S 27,1 29,3 19,0 29,0 29,4
4230/4 30,9 33,4 21,8 33,2 33,5
42,7 38,9 43,5 34,9 37,9 45,9 41,9 46,8 37,5 40,8 36,7 31,3 40,5 28,1 30,6 39,5 33,6 43,5 30,2 32,9
4230/4S 37,3 40,4 26,3 40,0 40,5
4230/5 38,8 41,9 27,3 41,6 41,9
4230/5S 46,6 50,4 32,8 50,0 50,6
4232/4 33,6 36,3 23,6 36,0 36,4
4232/4S 40,5 43,8 28,5 43,4 44,0
38,6 35,2 39,4 31,6 34,4 41,5 37,8 42,4 34,0 37,0 33,2 28,2 36,6 25,4 27,7 35,7 30,3 39,4 27,3 29,8
4232/5 39,9 43,1 28,1 42,8 43,0
4232/5S 48,2 52,1 33,9 51,7 52,3
4241/5 40,9 44,2 28,8 43,8 44,4
4241/5S 49,5 53,5 34,8 53,1 53,7
4241/6 52,2 47,7 53,4 42,8 46,5 56,1 51,3 57,4 46,0 50,0 45,1 38,3 49,6 34,4 37,5 48,4 41,1 53,3 37,0 40,3
67,2 72,6 47,3 72,0 73,0
4241/6S
4241/7S 74,2 80,2 52,2 79,6 80,5
4275/4S 53,4 57,7 37,5 57,3 57,9
4275/5S 54,5 58,9 38,3 58,4 59,1
4275/6S 80,6 87,1 56,8 86,4 87,6 104,4 95,4 106,8 85,5 93,0 112,2 102,5 114,8 91,9 100,0 90,1 76,5 99,1 68,9 75,0 96,9 82,3 106,6 74,0 80,6
4275/7S 92,8 100,3 65,3 99,5 100,6
4275/9S 96,5 104,3 67,9 103,5 104,7

(1) Maximum values of the refrigerant flow capacity at which the drier can be used when fluid dehydration is not the a major problem,
provided that the original moisture is limited before the installation of the drier. The maximum refrigerant flow capacities are referred
to a total pressure drop of 0,07 bar, inlet and outlet connections included, (according to ARI STANDARD 710:86 - with condensing
temperature at +30 °C and evaporating temperature at -15 °C)
(2) Water capacity values with R22 are referred to the following conditions, fixed in ARI STANDARD 710:86:
- Liquid temperatures: 25 °C and 50 °C
- Equilibrium point dryness, EPD: 60 ppm
Water capacity values with the other refrigerant fluids are referred to the following conditions, fixed in DIN 8949:2000 Standard:
- Liquid temperatures: 25 °C and 50 °C
- Equilibrium point dryness, EPD: 50 ppm

98 www.castel.it
 TABLE 5: Dimensions and Weights
Connections
Dimensions
[mm]
Catalogue ODS Weight
Number SAE [g]
Flare Ø Ø ØD L
[in.] [mm]

4303/2 4203/2 1/4" – – 103 240

4303/2F – 1/4" – – 92 230
4303/2S 4203/2S – 1/4" – 94 220

L
4303/3 4203/3 3/8" – – 111 235
4305/2 4205/2 1/4" – – 119
275
4305/2F – 1/4" – – 109
4305/2S 4205/2S – 1/4" – 110 260
4305/3 4205/3 3/8" – – 127 295
4305/3S 4205/3S – 3/8" –
112 260
4305/M10S – – – 10
4308/2 4208/2 1/4" – – 146
52 380
4308/2F – 1/4" – – 135

D
4308/2S 4208/2S – 1/4" – 137 345
4308/3 4208/3 3/8" – – 154 395 male connections
4308/3F – 3/8" – – 142 380
4308/3S 4208/3S – 3/8" –
139 345
4308/M10S – – – 10
4308/M12S – – – 12 146 380
4308/4 4208/4 1/2" – – 162 430
4308/4S 4208/4S – 1/2" – 146 380
4316/2 4216/2 1/4" – – 158 635
4316/3 4216/3 3/8" – – 166 690
4316/3F – 3/8" – – 154 680
L

4316/3S 4216/3S – 3/8" – 620

151
4316/M10S – – – 10 630
4316/M12S – – – 12 158 640
4316/4 4216/4 1/2" – – 174 680
4316/4S 4216/4S – 1/2" – 158 640
73
4316/5 4216/5 5/8" – – 183 740
4316/5S 4216/5S – 5/8" 16 166 640
4330/3 4230/3 3/8" – – 245 1380
4330/3S 4230/3S – 3/8" – 230 1240

D
4330/4 4230/4 1/2" – – 253 1360
4330/4S 4230/4S – 1/2" – 237 1280 male - female connections (female - in)
4330/5 4230/5 5/8" – – 262 1480
4330/5S 4230/5S – 5/8" 16 245 1370
4332/4 4232/4 1/2" – – 187 1300
4332/4S 4232/4S – 1/2" – 173 1200
4332/5 4232/5 5/8" – – 196 1320
4332/5S 4232/5S – 5/8" 16 179 1250
4341/5 4241/5 5/8" – – 231 1580
4341/5S 4241/5S – 5/8" 16 214 1470
L

4341/6 4241/6 3/4" – – 232 1640

91
4341/6S 4241/6S – 3/4" – 1560
219
4341/7S 4241/7S – 7/8" – 1600
4375/4S 4275/4S – 1/2" – 367 2540
4375/5S 4275/5S – 5/8" 16 373 2640
4375/6S 4275/6S – 3/4" – 378 2820
4375/7S 4275/7S – 7/8" – 378 2900
4375/9S 4275/9S – 1.1/8" – 378 3050

D

solder connections

www.castel.it 99
 FILTER DRIERS WITH REPLACEABLE ANTI-ACID
SOLID CORE
Approved by Underwriters Laboratories filter, the refrigerant fluid must pass through
Inc. u the mesh sieve on which blocks are
Except filters 4423/17A, /21A, /25A and mounted. The danger that small particles of
4424/25A, /33A dehydrating material being introduced into
the system is thus avoided. Furthermore, at
APPLICATIONS filter outlet, a plastic cup, the edge of which
closely adheres to the inner surface of the
The filters, shown in this chapter, are filter, prevents dirt from reaching the outlet
classified “Pressure vessels” in the sense of connection during normal operation and
the Pressure Equipment Directive 97/23/EC, block change.
Article 1, Section 2.1.1 and are subject of
Article 3, Section 1.1 of the same Directive. CONSTRUCTION
They are designed for installation on
commercial refrigerating systems and on The filters type 4410 are manufactured in
civil and industrial conditioning plants, steel, with the exception of the connections
which use refrigerant fluids proper to the which are made of EN 12735-1 – Cu-DHP
Group II (as defined in Article 9, Section 2.2 copper tube.
of Directive 97/23/EC and referred to in The filters type 4420 are completely
Directive 67/548/EEC). manufactured in steel and solder
connection, are machined with a steel bar
OPERATION EN 10025 S355JR.
The blocks series 4490 and 4491 has been
In the case of filters with more than one developed for specific installations on
block, the passage of the fluid takes place refrigerating systems using HFC refrigerant
in parallel; as a result, the pressure drop fluids, particularly R134a, R404A, R407C,
does not increase proportionately to the R410A ed R507 mixed with polyolester
number of blocks. A large ring between the lubricants. In spite of this, the new block
block and the inner surface of the filter may be successfully used also in
permits the accumulation of solid particles, refrigerating systems using the old CFC or
and prevents clogging. Before leaving the HCFC refrigerant fluids, mixed with mineral
lubricants.
The blocks 4490, type A and type B, and the
block 4491, type A, are molded from a blend
of dehydrating charge, totally made of 3 Å
molecular sieves, and a special binding
agent in appropriate proportions. The choice
of the 3 Å molecular sieves, as sole
dehydrating material, gives to the block a
superlative capacity of water adsorption also
maintaining quite good deacidifying
characteristics.
The blocks 4490, type AA and type AB, and
the block 4491, type AA, are molded from a
blend of dehydrating charge, 80% of 3 Å
molecular sieves and 20 % of activated
alumina, and a special binding agent in
appropriate proportions. The choice of
blend, molecular sieves – activated alumina,
gives to the block a very high capacity of
acid adsorption also maintaining very good
dehydrating characteristics.
The presence of a controlled and defined
percentage of activated alumina, lower than
the maximum value recommended by
ASERCOM, keeps unchanged the original
concentration of additives in the polyolester
lubricant.

100 www.castel.it
 DEHYDRATORS AND FILTERS
TABLE 1: General Characteristics
Connections
Nominal TS [°C] Risk
Core Filtering Volume
Catalogue Core Cat. Number ODS W PS Category
Surface
Number Number of Cores [bar] according
[cm2]
Ø Ø Ø to PED
[cu.in] [cm3] [in.] [mm] [mm] min. max.

4411/5A 5/8" 16
4411/7A 7/8" 22
4411/9A 1.1/8" –
4411/11A 1 420 48 800 1.3/8" 35
4411/13A 1.5/8" –
4411/M42A – 42
4411/17A 2.1/8" 54
4412/7A 4490/A - 7/8" 22
45 (1)
4412/9A 4490/B - 1.1/8" –
– I
4412/11A 4490/AA 2 840 96 1600 1.3/8" 35
4412/M42A 4490/AB – 42
– 40 +80
4412/17A 2.1/8" 54
4413/11A 1.3/8" 35
4413/13A 3 1260 144 2400 1.5/8" –
4413/M42A – 42
4414/13A 1.5/8" –
4414/M42A 4 1680 192 3200 – 42 35 (1)
4414/17A 2.1/8" 54
4423/17A 2.1/8" 54 60,3
4423/21A 3 1890 300 4800 2.5/8" – 76,1
4491/A
4423/25A – – 88,9 32 II
4491/AA
4424/25A – – 88,9
4 2520 400 6400
4424/33A – – 114,3

(1) PS = 470 psig in compliance with the UL approval

The manufacturing process of blocks series

4490 and 4491 gives a considerable 5

compacted ness and stoutness to both the 3

products so that they are resistant to
shocks and abrasions. 4
inlet
The blocks series 4490 have a volume of 48
cu.in., equivalent to approx. 800 cm3, and it
is used with type 4411, 4412, 4413 and
4414 filters.
1
The block series 4491 has a volume of 100
cu.in., equivalent to approx. 1600 cm3. and
it is used with type 4421, 4423 and 4424
filters.
The two blocks are shaped as a hollow 2
cylinder and their overall dimensions
correspond to those of other international
brands. Consequently they are
4
interchangeable. The hollow cylinder shape
offers a large surface area to the inflowing
fluid, which crosses the block in radial
sense. As a result, dehydration is highly outlet
efficient with a minimum loss of charge.
Filters may be supplied also with an access Sketch of filter with 2 blocks
fitting kit G9150/R05, to be ordered 1 – Block
separately. 2 – Mesh sieve serving as block support
3 – Spring
4 – Retainer cup
5 – Access fitting 1/4” SAE flare (to order separately)

www.castel.it 101
 TABLE 2A: Refrigerant Flow Capacity and Water Capacity (filters)

Refrigerant Flow Capacity, Water Capacity Dehydratable Charge Water Capacity Dehydratable Charge
pressure drop at + 25 °C (2) [g H2O] at + 25 °C at + 50 °C (2) [g H2O] at + 50 °C
Catalogue 0,07 bar (1) [kW] [kg refrigerant] [kg refrigerant]
Number
R407C

R407C

R407C

R407C

R407C
R404A

R410A

R404A

R410A

R404A

R410A

R404A

R410A

R404A

R410A
R134a

R134a

R134a

R134a

R134a
R22

R22

R22

R22

R22
4411/5A 83 90 59 89 90
4411/7A 146 158 103 156 159
4411/9A 200 216 141 214 217
4411/11A 233 252 164 250 253 84 77 86 69 75 90 83 92 74 81 72 61 80 56 60 77 66 86 60 65
4411/13A
4411/M42A 250 270 176 268 271
4411/17A
4412/7A 146 158 103 156 159
4412/9A 226 244 159 242 245
4412/11A 306 331 215 328 332 168 154 172 138 150 181 166 185 148 161 144 122 160 112 120 155 131 172 120 129
4412/M42A
333 361 234 357 362
4412/17A
4413/11A 327 354 230 351 355
4413/13A 252 231 258 207 225 271 248 277 223 242 216 183 240 168 180 232 197 258 181 194
361 391 254 387 393
4413/M42A
4414/13A
4414/M42A 426 460 300 456 462 336 308 344 276 300 361 331 370 297 323 288 244 320 224 240 310 262 344 241 258
4414/17A
4423/17A 447 483 315 479 485
4423/21A 492 532 346 527 534 504 462 516 414 450 542 497 555 445 484 432 366 480 336 360 465 394 516 361 387
4423/25A 670 725 472 719 728
4424/25A 737 797 519 791 800
672 616 688 552 600 723 662 740 594 645 576 488 640 448 480 619 525 688 482 516
4424/33A 1180 1276 830 1265 1281

TABLE 2B: Refrigerant Flow Capacity and Water Capacity (single block)

Refrigerant Flow Capacity, Water Capacity Dehydratable Charge Water Capacity Dehydratable Charge
pressure drop at + 25 °C (2) [g H2O] at + 25 °C at + 50 °C (2) [g H2O] at + 50 °C
Catalogue 0,07 bar (1) [kW] [kg refrigerant] [kg refrigerant]
Number
R407C

R407C

R407C

R407C

R407C
R404A

R410A

R404A

R410A

R404A

R410A

R404A

R410A

R404A

R410A
R134a

R134a

R134a

R134a

R134a
R22

R22

R22

R22

R22

4490/A - 4490/B 84 77 86 69 75 90 83 92 74 81 72 61 80 56 60 77 66 86 60 65
–
4491/A 168 154 172 138 150 181 166 185 148 161 144 122 160 112 120 155 131 12 120 129
4490/AA - 4490/AB 71 65 73 59 64 77 70 79 63 69 61 52 68 48 51 66 56 73 51 55
(3)
4491/AA 143 131 146 117 128 154 141 157 126 137 122 104 136 95 102 132 112 146 102 110

(1) Maximum values of the refrigerant flow capacity at which the drier can be used when fluid dehydration is not the a major problem,
provided that the original moisture is limited before the installation of the drier. The maximum refrigerant flow capacities are referred
to a total pressure drop of 0,07 bar, inlet and outlet connections included, (according to ARI STANDARD 710:86 - with condensing
temperature at + 30 °C and evaporating temperature at -15 °C)
(2) Water capacity values with R22 are referred to the following conditions, fixed in ARI STANDARD 710:86:
- Liquid temperatures: 25 °C and 50 °C
- Equilibrium point dryness, EPD: 60 ppm
Water capacity values with the other refrigerant fluids are referred to the following conditions, fixed in DIN 8949:2000 Standard:
- Liquid temperatures: 25 °C and 50 °C
- Equilibrium point dryness, EPD: 50 ppm
(3) Maximum values of the refrigerant flow capacity (according to ARI STANDARD 710:86) at which filter driers:
- series 4411, 4412, 4413, and 4414 can be used with blocks type 4490/AA and 4490/AB
- series 4423 and 4424 can be used with blocks type 4491/AA
when fluid dehydration is not the a major problem, are the same achieved with block type 4490/A, 4490/B and 4491/A.

102 www.castel.it
 DEHYDRATORS AND FILTERS
TABLE 3: Dimensions and Weights
Connections
Dimensions
[mm]
Catalogue ODS W Weight
Number [g]
Ø Ø Ø Ø D1 Ø D2 H1 H2 H3 P
[in.] [mm] [mm]

4411/5A 5/8" 16 148 235 90 5360

4411/7A 7/8" 22 5405
154 241 96
4411/9A 1.1/8" – 5395
4411/11A 1.3/8" 35 159 246 185 101 5464
4411/13A 1.5/8" – 5435
171 258 113
4411/M42A – 42 5410
4411/17A 2.1/8" 54 162 249 103 5585
4412/7A 7/8" 22
296 383 96 6880
4412/9A 1.1/8" –
– 121 149
4412/11A 1.3/8" 35 300 387 101 7015
4412/M42A – 42 312 399 113 6985
4412/17A 2.1/8" 54 303 390 103 7136
4413/11A 1.3/8" 35 442 529 324 101 8510
4413/13A 1.5/8" – 8470
454 541
4413/M42A – 42 8445
113
4414/13A 1.5/8" – 9940
595 682
4414/M42A – 42
10010
4414/17A 2.1/8" 54 586 673 103
4423/17A 2.1/8" 54 60,3 18000
520 641 143
4423/21A 2.5/8" – 76,1 600 18200
4423/25A – – 88,9 163 200 543 666 18400
168
4424/25A – – 88,9 710 833 21600
760
4424/33A – – 114,3 720 843 178 22000

H3 H2

H1
20
P
ØD1
ØD2

www.castel.it 103
 BLOCKS REPLACEMENT

Blocks must be ordered separately from the 6 The internal cleanliness of the body is
filter. They are supplied in individual guaranteed by the cleaning effect of the
packages, which are hermetically sealed in cup which is characteristic of Castel
suitable wrappings (type 4490), and in filters.
special bags (type 4491) for safe storage if air is supposed to have entered the
over long periods of time. plant during filter block replacement,
Every cartridge is equipped of two seals in produce a vacuum in the low-pressure
synthetic material to use like seal between side of the plant, and always in the sector
the two cartridges and between the of the circuit involved.
cartridge and its covers. 7 Open the valve on the departure of liquid
If the filter is installed in a system without line
any by-pass, the block replacement has to 8 Slowly open the suction valve of the
be done following these instructions: compressor and start the compressor
and its auxiliaries.
1 Close the valve on the departing line. 9 Top the charge up, if necessary.
2 Start the compressor and its auxiliaries in
order to transfer the refrigerant charge
into the high pressure side of the plant
(liquid receiver).
3 Stop the compressor at a suction
pressure sufficiently higher than the
atmospheric pressure.
4 Shutt off the service valve at the suction
side of the compressor.
NOTE: if during the transfer of the
refrigerant to the high-pressure side of
the plant, the discharge pressures reach
too high values (the condenser is flooded
H

due to insufficient capacity of the liquid

receiver), shut off the valve on the
compressor suction side and stop
immediately the compressor.
5 Replace quickly the filter block. During
the preparation of the new block, close
D1
the filter with a clean cloth. The slight
D2
over-pressure inside the filter and the
ability of the technician will prevent air
4490
from getting into the plant.

TABLE 4: General Characteristics, Dimensions and Weights

Nominal Dimensions
H

Core Filtering Volume [mm]

Catalogue Weight
Surface
Number [g]
[cm2]
[cu.in] [cm3] Ø D1 Ø D2 H

4490/A
4490/B (1)
420 48 800 47 96 140 670
4490/AA
4490/AB (1)

D1
4491/A
630 100 1600 53 122 165 1350
4491/AA
D2

(1) Supplied without cover gasket as spare part 4491

104 www.castel.it
MECHANICAL FILTERS WITH REPLACEABLE FILTERING

DEHYDRATORS AND FILTERS

BLOCK
Approved by Underwriters Laboratories SUCTION LINE
Inc. u
Except filters 4421/21C, /25C, /M80C, /33C SELECTION CRITERION

APPLICATIONS With clean systems, refrigerant flow

capacity and pressure drops of table 2 are
The filters, shown in this chapter, are reported to a gas speed of 20 m/s for pipes
classified “Pressure vessels” in the sense of adequate to the filter connections.
the Pressure Equipment Directive 97/23/EC, For refrigerant flow capacities different from
Article 1, Section 2.1.1 and are subject of the table values, under the other same
Article 3, Section 1.1 of the same Directive. conditions, gas speeds and relative
They are designed for installation on pressure drops through the filter can be
commercial refrigerating systems and on gained for simple proportionality.
civil and industrial conditioning plants,
which use refrigerant fluids proper to the EXAMPLE
Group II (as defined in Article 9, Section 2.2
of Directive 97/23/EC and referred to in System data:
Directive 67/548/EEC). Refrigerant: R407C
Refrigerant flow capacity: 130 [kW]
OPERATION Evaporating temperature: + 5 [°C]
Suction pipe: Ø 2.1/8”
Good filtering of the refrigerant on the low- Filter: 4411/17C
pressure side of the system is a guarantee
of protection for the compressor. System In table 2, corresponding to filter type
cleanliness is ensured by micro filtering 4411/17C refrigerant and evaporating
cores, which filter out impurities derived temperature, the following data is given:
from manufacture and assembly of the
refrigerating system. – refrigerant flow capacity = 141,7 [kW];
– pressure drop = 0,21 [bar].
CONSTRUCTION
The gas speed in the suction line will be:
The filters type 4410 are manufactured in
steel, with the exception of the connections 130 2
which are made of EN 12735-1 – Cu-DHP 20 × = 16,8 [m/s]
141,7 2
copper tube.
The filters type 4420 are completely
manufactured in steel and solder Pressure drop through the filter:
connection, are machined with a steel bar
EN 10025 S355JR. 130 2
Zinc plated wire cloths and a filtering 0, 21× = 0,177 [bar]
141,7 2
baffle form the block, which features
a large surface, with controlled porosity. Remember that the dimensioning of the
The block can stop solid particles up suction line in a refrigerating system
to 20 micron. At the two ends, soft € requires great attention.
felt gaskets ensure perfect sealing In fact the relative pressure loss,
with the plastic cups. Filters are supplied included filter, which implies a reduction of
with an access fitting kit G9150/R05. flow capacity sucked by the compressor,
influences directly the refrigerating capacity
of the plant.
This line is normally sized to have a total
pressure loss lower then a variation of the
saturation temperature of 1° C.
For example diagram 1, referred to R22,
allows to estimate the aforesaid variation in
function of pressure loss and evaporating
temperature.

www.castel.it 105
 After all it’s always important to remember To such purpose diagram 2 illustrates the
that the refrigerant flow capacity of a existing relation between saturation
compressor, under the other same temperature, in the suction line, and
conditions, can reduce considerably variation of the refrigerant flow capacity of a
because of the decrease of the saturation compressor.
temperature, consequent to the pressure
loss in the suction line.

TABLE 1: General Characteristics

Connections
TS [°C] Risk
Core Filtering
Catalogue Core Cat. Number ODS W PS Category
Surface
Number Number of Cores [bar] according
[cm2]
Ø Ø Ø to PED
min. max.
[in.] [mm] [mm]

4411/7C 7/8" 22
4411/9C 1.1/8" –
4411/11C 1.3/8" 35
4411/13C 4495/C 820 1.5/8" – – 45 (1)
4411/M42C – 42
4411/17C 1 2.1/8" 54 – 40 +80 I
4411/21C 2.5/8" –
4421/21C 2.5/8" – 76,1
4421/25C – – 88,9 32
4496/C 1850
4421/33C – – 114,3

(1) PS = 470 psig in compliance with the UL approval

3
2
inlet

outlet

Sketch of filter with

mechanical block
1 – Block
2 – Retainer cup
3 – Spring

106 www.castel.it
DIAGRAM 1

DEHYDRATORS AND FILTERS

-45 -40 -35
6
-30
5
-25
Equivalent variation of the

re
saturation temperature

tu
4 -20

ra
pe
m
te
-15

n
3
io
at -10
or
ap

-5
ev

2 0
+10

0
0 5 10 15 20 25 30 35
Pressure loss (kPa)

DIAGRAM 2

Correction factor of refrigerant flow capacity

1,5

0,5

0
-40 -35 -30 -25 -20 -15 -10 -5 0 5 10

Saturation temperature at the suction (°C)

www.castel.it 107
 TABLE 2: Refrigerant Flow Capacity and Pressure Drop
Evaporating Temperature [°C]

Catalogue Refrigerant +5 0 -10 -20 -30

Number

[kW] [bar] [kW] [bar] [kW] [bar] [kW] [bar] [kW] [bar]

R134a 17,0 0,084 13,7 0,070 9,0 0,048 6,0 0,033 3,5 0,021
R22 26,0 0,120 21,5 0,100 15,6 0,074 10,8 0,052 7,2 0,037
4411/7C R404A 23,7 0,150 20,0 0,130 14,0 0,090 9,0 0,060 6,0 0,040
R407C 22,2 0,100 19,0 0,090 12,8 0,060 8,4 0,043 5,1 0,028
R410A 38,4 0,230 31,7 0,200 23,0 0,140 16,0 0,100 10,6 0,100
R134a 28,7 0,091 23,0 0,074 15,0 0,051 10,0 0,035 6,0 0,022
R22 43,0 0,130 36,4 0,110 26,0 0,080 18,0 0,056 12,0 0,040
4411/9C R404A 40,0 0,160 34,0 0,140 24,0 0,100 15,0 0,070 10,0 0,050
R407C 37,6 0,110 32,1 0,100 21,3 0,066 14,2 0,047 8,7 0,031
R410A 63,5 0,250 53,7 0,210 38,0 0,150 26,0 0,110 17,7 0,110
R134a 43,5 0,092 35,0 0,075 23,0 0,052 15,0 0,036 9,0 0,023
R22 65,0 0,130 55,0 0,110 39,0 0,080 27,0 0,056 18,0 0,040
4411/11C R404A 60,7 0,160 51,4 0,140 36,2 0,100 22,7 0,070 14,5 0,050
R407C 57,0 0,110 48,6 0,100 33,2 0,068 21,9 0,047 13,4 0,031
R410A 96,0 0,250 81,0 0,210 57,0 0,150 40,0 0,110 26,0 0,110
R134a 62,0 0,110 50,0 0,090 33,0 0,062 21,4 0,043 13,0 0,027
R22 93,0 0,150 79,0 0,130 56,0 0,090 39,0 0,064 26,0 0,046
4411/13C
R404A 86,8 0,200 73,5 0,170 51,7 0,120 32,4 0,080 20,7 0,060
4411/M42C
R407C 81,4 0,136 69,5 0,120 47,5 0,080 31,3 0,056 19,2 0,037
R410A 137,0 0,300 116,0 0,250 82,0 0,180 57,0 0,120 38,0 0,100
R134a 108,3 0,170 87,0 0,140 57,2 0,100 37,3 0,070 22,4 0,040
R22 162,0 0,230 137,0 0,190 97,0 0,150 66,4 0,100 44,0 0,070
4411/17C R404A 151,3 0,310 128,0 0,270 90,0 0,190 56,5 0,130 36,0 0,100
R407C 141,7 0,210 121,1 0,180 82,6 0,125 54,4 0,087 33,4 0,057
R410A 239,0 0,440 202,0 0,370 143,0 0,290 98,0 0,250 65,0 0,200
R134a 167,0 0,300 133,5 0,250 87,5 0,180 57,0 0,120 34,3 0,070
R22 249,0 0,420 211,0 0,360 149,0 0,270 102,0 0,180 68,0 0,120
4411/21C R404A 232,7 0,550 197,0 0,480 138,6 0,330 87,0 0,230 55,5 0,170
R407C 218,0 0,380 186,4 0,330 127,0 0,210 83,7 0,150 51,4 0,100
R410A 368,0 0,810 311,0 0,700 220,0 0,520 150,0 0,350 100,0 0,240
R134a 167,0 0,120 133,5 0,100 87,5 0,070 57,0 0,050 34,3 0,030
R22 249,0 0,170 211,0 0,150 149,0 0,110 102,0 0,074 68,0 0,050
4421/21C R404A 232,7 0,220 197,0 0,200 138,6 0,130 87,0 0,100 55,5 0,070
R407C 218,0 0,160 186,4 0,140 127,0 0,090 83,7 0,060 51,4 0,040
R410A 368,0 0,340 311,0 0,300 220,0 0,200 150,0 0,150 100,0 0,100
R134a 238,0 0,210 191,0 0,180 125,0 0,120 81,5 0,090 49,0 0,050
R22 356,0 0,300 302,0 0,260 213,0 0,190 146,0 0,130 97,0 0,090
4421/25C R404A 332,0 0,390 281,0 0,340 198,0 0,220 124,0 0,170 79,3 0,120
R407C 312,0 0,270 266,0 0,230 182,0 0,150 119,7 0,100 73,5 0,070
R410A 526,0 0,600 446,0 0,500 315,0 0,370 215,0 0,250 143,0 0,200
R134a 416,0 0,630 334,0 0,540 218,0 0,360 142,0 0,270 85,0 0,150
R22 623,0 0,900 528,0 0,770 372,0 0,570 255,0 0,390 170,0 0,270
4421/33C R404A 581,0 1,170 491,0 1,000 346,0 0,660 217,0 0,500 138,7 0,360
R407C 547,0 0,790 468,0 0,690 320,0 0,440 210,0 0,300 129,0 0,200
R410A 921,0 1,800 780,0 1,400 550,0 1,200 377,0 0,800 251,0 0,530

Refrigerant flow capacities and pressure drops are referred to the following working conditions:
– Liquid temperature ahead expansion valve: + 35 °C
– Overheating of suction gas: 6 °C

108 www.castel.it
 DEHYDRATORS AND FILTERS
TABLE 3: Dimensions and Weights
Connections
Dimensions
[mm]
Catalogue ODS W Weight
Number [g]
Ø Ø Ø Ø D1 Ø D2 H1 H2 H3 P
[in.] [mm] [mm]

4411/7C 7/8" 22 5450

154 241 96
4411/9C 1.1/8" – 5375
4411/11C 1.3/8" 35 159 246 101 5435
4411/13C 1.5/8" – – 121 149 185
171 258 113 5410
4411/M42C – 42
4411/17C 2.1/8" 54 162 249 103 5585
4411/21C 2.5/8" – 186 273 128 6030
4421/21C 2.5/8" – 76,1 187 308 143 12000
4421/25C – – 88,9 163 200 210 333 200 168 12200
4421/33C – – 114,3 220 343 178 12500

D1

H3
20
ØD2
H

D2

4495 - 4496
H2
H1

ØD1

TABLE 4: General Characteristics

Dimensions and Weights P

Filtering Dimensions
Surface [mm]
Catalogue Weight
Number [g]
[sq.in] [cm2] Ø D1 Ø D2 H

4495/C 127 820 60 87 138 480

4496/C 287 1850 80 113 168 750

www.castel.it 109
 STRAINERS

APPLICATIONS CONSTRUCTION
The filters, shown in this chapter, are The filter is completely manufactured in
classified “Pressure vessels” in the sense of steel, either with nickel-plated Flare
the Pressure Equipment Directive 97/23/EC, threaded connections. The product range
Article 1, Section 2.1.1 and are subject of also includes types with copper plated
Article 3, Section 1.1 of the same Directive. solder connections, offering the possibility
They are designed for installation on to solder the copper pipe inside the
commercial refrigerating systems and on connections (ODS) or outside the
civil and industrial conditioning plants, connections, using a copper sleeve (ODM).
which use refrigerant fluids proper to the Inside the filters there is a screen basket,
Group II (as defined in Article 9, Section 2.2 with wide filtering surface, made of
of Directive 97/23/EC and referred to in austenitic stainless steel AISI 304.
Directive 67/548/EEC). These filters may not be cleaned.

TABLE 1: General Characteristics

Connections TS [°C]
Useful Risk
Catalogue Filtering Passage Mesh Kv PS Category
Surface Opening ODS ODM Factor
Number Surface SAE [bar] according
[cm2] [%] [mm] [m3/h] min. max. to PED
Flare Ø Ø Ø Ø
[in.] [mm] [in.] [mm]

4510/3 58 3/8" – – – – 2,4

4510/4 142 1/2" – – – – 3,2
4520/3 – 3/8" – 1/2" –
2,4
4520/M10 – – 10 – 12
36,6 0,166 – 40 +80 45 Art. 3.3
4520/M12 58 – – 12 – 14
4520/4 – 1/2" – 5/8" 16 3,4
4520/5 – 5/8" 16 3/4" –
4520/M18 142 – – 18 – 22 8,0

TABLE 2: Dimensions and Weights

Dimensions
[mm]
Catalogue Weight
Number [g]
ØD L

4510/3 52 110 195

L
L

4510/4 76 174 515

4520/3
109 195
4520/M10
4520/M12 52 113 205
4520/4 122 215
4520/5 126 245
4520/M18 76 170 495
D

D

4510 4520

DESSICCANTS
For using on refrigerating systems, Castel hermetically sealed in steel cans with a
puts the following desiccants at disposal of weight of about 0,750 kg and supplied in
its own customers: multiply package of 15 cans.
• Activated alumina Code No 4901/AA
• Molecular sieve Code No 4901/MS
• Silicagel Code No 4901/SG

110 www.castel.it