CALEFFI DISCAL. deaerator-dirt separator DISCAL series ACCREDITED 01123/17 GB. replaces dp 01123/14 GB

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1 ISL deaerator-dirt separator ISL series RI ISO 9001 M 2164 LI 01123/17 replaces dp 01123/14 unction eaerators-dirt separators are used to continuously eliminate the air and dirt contained in the hydraulic circuits of heating and cooling systems. hey are capable of automatically removing all the air present in the system down to micro-bubble level. t the same time they separate dirt and impurities contained in the water within the circuit and collect them in the lower part of the valve body, from which they may be expelled. Versions fitted with a magnet are designed for the separation of ferrous impurities. he circulation of fully deaerated water enables the equipment to operate under optimum conditions, free from any noise, corrosion, localised overheating or mechanical damage. hreaded, flanged and weld-end deaerators-dirt separators are supplied complete with hot pre-formed shell insulation to ensure perfect heat insulation when used in both hot and chilled water systems. Reference documentation: - rochure 060 ISL deaerator 1 series - rochure IRL dirt separator 462 series Product range 46 series ISLIR deaerator-dirt separator with compression ends size N (Ø 22) 46 series ISLIR deaerator-dirt separator sizes N (3/4 ), N 2 (1 ), N 32 (1 1/4 ) 461 series ISLIR deaerator-dirt separator with magnet sizes N (3/4 ), N 2 (1 ), N 32 (1 1/4 ) 461 series ISLIR deaerator-dirt separator with magnet and insulation sizes N (1 1/2 ), N 0 (2 ) 46 series ISLIR deaerator-dirt separator with flanged connections and insulation sizes N 0 N series ISLIR deaerator-dirt separator with weld-ends and insulation sizes N 0 N series ISLIR deaerator-dirt separator with flanged connections and floor brackets sizes N 0 N 300

2 echnical specifications series 46 threaded 46 flanged and weld-end Materials ody: - N N 32 brass N 1216 W617N epoxy resin coated steel - N N 0 epoxy resin coated steel irt separation chamber: brass N 1216 W617N - utomatic air vent body: brass N 1216 W617N brass N 1216 W617N Internal element: P6630 stainless steel loat: PP PP loat guide and stem: brass N W614N brass N W614N loat lever and spring: stainless steel stainless steel Hydraulic seals: PM PM rain cock: brass N 1216 W617N - rain valve: - brass N 1216 W617N Performance Medium: Water, glycol solutions Water, non-hazardous glycol solutions excluded from the guidelines of directive 67/48/ Max. percentage of glycol: 0% 0% Max. working pressure: bar bar Working temperature range: Particle separation rating: down to mm down to mm Ring system magnetic induction: (461 series) 2 x 0,3 - onnections Main: with compression ends for Ø 22 mm copper pipe; N 0 N 10, PN 16 3/4, 1, 1 1/4, 1 1/2, 2 (ISO 228-1) N 0 N 300, PN to be coupled with flat counterflange N 92-1 N 0 N 10 weld ends Probe holder: N 0 N 300, inlet/outlet 1/2 rain: hose connection N 0 N 10, 1 N 0 N 300, 2 echnical specifications of insulation for threaded models codes 4600/6/7 Material: closed cell expanded P-X hickness: mm ensity: - inner part: 30 kg/m 3 - outer part: 80 kg/m 3 hermal conductivity (ISO 281): - at 0 : 0,038 W/(m K) - at : 0,04 W/(m K) oefficient of resistance to water vapour (IN 261): > Working temperature range: 0 1 Reaction to fire (IN 42): class 2 echnical specifications of insulation for threaded models codes 46118/9 Material: closed cell expanded P-X hickness: mm ensity: - inner part: 30 kg/m 3 - outer part: 80 kg/m 3 hermal conductivity (ISO 281): - at 0 : 0,038 W/(m K) - at : 0,04 W/(m K) oefficient of resistance to water vapour (IN 261): > Working temperature range: 0 0 Reaction to fire (IN 42): class 2 echnical specifications of insulation for flanged and weld-end models from N 0 to N 10 Inner part Material: closed cell expanded P-X hickness: N 0 N 0; 60 mm N 12 N 10; 0 mm ensity: - inner part: 30 kg/m 3 - outer part: 80 kg/m 3 hermal conductivity (ISO 281): - at 0 : 0,038 W/(m K) - at : 0,04 W/(m K) oefficient of resistance to water vapour (IN 261): >1300 Working temperature range: 0 0 Reaction to fire (IN 42): class 2 xternal cover Material: embossed unfinished aluminium hickness: 0.7 mm Reaction to fire (IN 42): class 1

3 imensions ode (kg) N Ø ,0 382 Size ode / , 1, (kg) , 64, 13 2" ode (kg) ode Size (kg) 4600 N 3/ , N ,9 460 N N N N 3211/ ,9 1" Size Volume (l) N 0 13,6 N 6 13,8 N 80 28,6 N 0 29,6 N 12 8 N N ode (kg) N 680 N N ode Size (kg) 46 N 3/ , N N N N , N N 3211/ , N

4 Operating principle he deaerator-dirt separator utilises the combined action of several physics principles. he active part consists of a set of concentric metal mesh surfaces. hese elements create the swirling motion required to facilitate the release of micro-bubbles and their adhesion to the surfaces. he bubbles, fusing with each other, increase in volume until the hydrostatic thrust is sufficient to overcome the force of adhesion to the structure. hey then rise towards the top of the device and are expelled through a f l o a t - o p e r a t e d automatic air vent valve. he impurities in the water, colliding with the metal surfaces of which the internal element is composed, are separated out and fall to the bottom of the valve body. onstruction details he special construction of ISLIR allows maintenance and cleaning procedures to be performed without removing the device from the system. Note in particular: ccess to the moving parts controlling the air vent is attained by simply removing the top cover (1). he deaerator-dirt separator automatic air vent valve, located at the top of the device, is equipped with a long chamber for float movement (2). his feature prevents any impurities in the water from reaching the seal seat. Simply unscrew the top part of the casing (3) to clean the entire air venting system. langed and weld-end deaerators-dirt separators are also equipped with a cock (4) which performs the dual function of releasing large amounts of air while the system is being filled and eliminating any impurities floating on top of the water : Separation of ferrous impurities irt separators fitted with a magnet offer greater efficiency in the separation and collection of ferrous impurities. he impurities are trapped inside the dirt separator body by the strong magnetic field created by the magnets inserted in the special outer ring. he outer ring can also be removed from the body to allow the decantation and subsequent expulsion of sludge while the system is still running. Since the magnetic ring is positioned outside the dirt separator body, the hydraulic characteristics of the device are not altered. ; When checking the internal element of threaded deaerators and dirt separators, simply unscrew the large dirt collection chamber () to which the internal element is fixed, so that it can be removed for cleaning. hreaded versions of ISLIR have a collection chamber equipped with a shut-off cock and hose attachment with plug (6), while flanged and weld-end versions have a ball shut-off valve (7). his means impurities can even be expelled while the system is in operation. 8 Insulation he threaded ISLIR (code 4600/6/7), threaded ISLIRM (code 46118/9,) flanged and weld-end ISLIR (N 0 N 10) devices are provided with hot pre-formed shell insulation. his system ensures not only perfect thermal insulation, but also the tightness required to prevent water vapour entering the device from the ambient. or this reason, this type of insulation may also be used in chilled water circuits as it prevents condensation from forming on the surface of the valve body.

5 0, ,6 0,7 0,8 0,9 1,2 1,4 1,6 1,8 2, 3 3, 4 4, Ø 22-3/ /4 1 1/2 2 N 0 N 6 N 80 N 0 N 12 N 10 N 0 N N 300 Hydraulic characteristics p (mm w.g.) p (kpa) 4 3, 2, 2 1,8 1,6 1,4 he maximum recommended flow speed at the device connections is ~ 1,2 m/s. he following table shows the maximum flow rates in order to meet this requirement ,2 1 0,9 0,8 0,7 0,6 0,3 0, 0,4 0,4 0, ,2 0,2 0,18 0,16 0, ,12 0,1 (m 3 /h) N onnections Kv (m 3 /h) N N 2 N 32 N N 0 N 0 N 6 N 80 N 0 N 12 N 10 N 0 N N 300 Ø 22-3/ /4 1 1/2 2 16,2 28,1 46,7 43,2 68, Maximum flow rate l/min 22,7,18 7,8 6,78 94,63 141,2 238,6 361, 64,8 980,0 1436,6 2433,0 3866,0 416,0 m 3 /h 1,36 2,11 3,47 3,41,68 8,47 14,32 21,69 33,89 8,8 86,2 146,0 232,0 32,0 he air formation process he amount of air which can remain dissolved in a water solution depends on the pressure and temperature. his relationship is known as Henry s law; the graph below allows us to quantify the physical phenomenon of releasing the air contained in the medium. or example: at a constant absolute pressure of 2 bar, if the water is heated from to 80, the amount of air released by the solution is equal to 18 l per m 3 of water. ccording to this law, it may be noted how the amount of air released by the solution increases as the temperature rises and the pressure decreases. his air is in the form of micro-bubbles with diameters in the order of tenths of a millimetre. In circuits of air-conditioning systems there are specific points where this micro-bubble formation process takes place continuously: inside boilers and devices which operate under conditions of cavitation. oiler micro-bubbles Micro-bubbles form continuously on the surfaces separating the water from the combustion chamber due to the high temperature of the medium. his air, carried by the water, collects at critical points of the circuit, from which it must be removed. Some of it is reabsorbed where it meets colder surfaces. raph of solubility of air in water Maximum amount (in litres) of dissolved air per m 3 of water (l/m 3 ) bsolute pressure 3 bar 4 bar bar 6 bar 7 bar 8 bar 2 bar 1 bar Water temperature avitation micro-bubbles Micro-bubbles develop where the speed of the medium is particularly high, with a corresponding reduction in pressure. hese points are usually the pump impellers and the water orifices of the regulating valves. hese microbubbles of air and steam, the formation of which is accentuated in non-deaerated water, may subsequently implode as a result of the cavitation effect.

6 Separation efficiency he capacity for separating the impurities in the medium circulating in the closed circuits of the systems basically depends on three parameters: 1) it increases as particle size and mass increases. he larger and heavier particles drop before the lighter ones. 2) It increases as the speed decreases. If the speed decreases, there is a calm zone inside the dirt separator and the particles separate more easily. 3) It increases as the number of recirculations increases. he medium in the circuit, which flows through the dirt separator a number of times during operation, is subjected to a progressive separation action until all impurities have been completely eliminated. he aleffi ISLIR deaerator-dirt separator, thanks to the special design of its internal element, is able to completely separate impurities in the circuit, down to a minimum particle size of mm. he graph alongside, summarising the tests carried out in a specialised laboratory (NO - Science and Industry), illustrates how the ISLIR /ISLIRM dirt separators (46 and 461 series) are able to quickly separate nearly all the impurities. fter only 0 recirculations, approximately one day of operation, up to 0% of particles with a diameter greater than 0 mm are effectively removed from the circuit; this figure is up to 80% (on average) for the smaller particles. he continual passing of the medium during normal operation of the system gradually leads to complete dirt removal. Reduced head losses normal Y strainer performs its function via a metal mesh selected for the size of the largest particle. he medium therefore has a consequent initial head loss that increases as the degree of clogging increases. Whereas, the dirt separator carries out its action by the particles striking the internal element and subsequently dropping into the collection chamber as a result of gravity. he consequent head losses are greatly reduced and are not affected by the amount of impurities collected. he adjacent graph shows a comparison of the differences in head loss between the two types of device. Particle separation capacity eaerator-dirt separator efficiency Particle dimensions (µm) fficiency (%) Separated quantity. 0% Initial quantity ( ) p (mm w.g.) omparison of head losses: deaerator-dirt separator - Y-SRINRS 0 16 Y-strainer curve 3/4 - Kv= fficiency 0 passages (0, m/s) ISLIR curve 3/4 - Kv= WORKIN ZON ISLIR IR 2 fficiency 0 passages (1 m/s) P (kpa) RRI SRINRS SPIL SRINRS , 3 2, 1,8 1,6 1,4 1,2 0,9 0,8 0,7 0,6 0,4 0,4 0, 0,3 0,2 0,18 0,16 0,14 0, , 0,2 0,1 (l/h) 00 Y SRINRS Installation ISLIR devices may be used in both heating and cooling circuits, to guarantee progressive elimination of impurities and the air which forms continuously. hey should preferably be installed after the boiler, on the pump suction side, as this is where most of the micro-bubbles form. ISLIR deaerators-dirt separators must be installed in a vertical position. It is recommended that the air vent valve cap is replaced with a aleffi 6 series hygroscopic safety cap if the device is installed in a location that cannot be inspected. HILLR

7 pplication diagram P Shut-off valve Pump 3-way cock nti-vibration joint all valve UOLOW est pocket Pocket LLSOP low rate metering device P Pressure switch Safety relief valve emperature gauge ifferential by-pass valve low switch Zone valve emperature probe Safety thermostat Regulator xpansion vessel as filter as regulator Y-strainer uel shut-off valve ackflow preventer utomatic filling unit

8 SPIIION SUMMRY ISLIR 46 series eaerator-dirt separator. Size N (from N to N 32); connections 3/4 (from 3/4 to 1 1/4 ) (ISO 228-1). Size N ; Ø 22 mm connections with compression ends for copper pipe. rass dirt separation chamber and body. rass automatic air vent valve body. P6630 internal element. PP float. rass float guide and stem. Stainless steel float lever and spring. PM hydraulic seals. rass drain cock. Medium: water and glycol solutions; maximum percentage of glycol 0%. Maximum working pressure bar. Working temperature range 0 1. Particle separation rating down to mm. rain: with hose connection. ISLIRM 461 series eaerator-dirt separator with magnet. Size N (from N to N 0); connections 3/4 (from 3/4 to 2 ) (ISO 228-1). ody made of brass (from N to N 32) and epoxy resin coated steel (N and N 0). rass dirt separation chamber. rass automatic air vent valve body. P6630 internal element. PP float. rass float guide and stem. Stainless steel float lever and spring. PM hydraulic seals. rass drain cock. Medium: water and glycol solutions; maximum percentage of glycol 0%. Maximum working pressure bar. Working temperature range 0 1. Particle separation rating down to mm. rain: with hose connection. losed cell expanded P-X shell insulation; working temperature range 0 0 (1 1/2 and 2 ). P - INRNIONL PPLIION PNIN. ISLIR 46 series eaerator-dirt separator. langed connections N 0 (from N 0 to N 10, PN 16, flanged N 0 (from N 0 to N 300) PN, coupling with counterflange N Weld-end connections N 0 (from N 0 to N 10). rass drain valve 1 (from N 0 to N 10), 2 (from N 0 to N 300). poxy resin coated steel body. rass automatic air vent valve body. Stainless steel internal element. PP float. rass float guide and stem. Stainless steel float lever and spring. PM hydraulic seals. Medium water and non-hazardous glycol solutions excluded from the guidelines of directive 67/48; maximum percentage of glycol 0%. Maximum working pressure bar. Working temperature range 0 1. Particle separation rating down to mm. losed cell expanded P-X shell insulation and embossed unfinished aluminium external cover. for flanged and weld-end models N 0 (from N 0 to N 10). Working temperature range 0 0. loor brackets for sizes N 0 (from N 0 to N 300). We reserve the right to make changes and improvements to the products and related data in this publication, at any time and without prior notice. aleffi S.p.. S.R. 229 no ontaneto d gogna (Novara) Italy el ax info@caleffi.com opyright 17 aleffi