5.5.5 Recirculating pump (Fig. 8)The condensation of the water vapour containedin the flue gas leaving the boiler (condensate)occurs when the return water temperature isless than 55°C and is significant above all whenstarting in the morning, after the boiler has beenoff all night. This condensate is acidic and corrosiveand, over time, attacks the metal plate onthe boiler. Consequently, a recirculating pumpwith the function of preventing condensateshould be installed between the outlet andreturn fittings, upstream of any mixing valve.The pump must ensure, when the system isoperating, a flow-rate of between 20 and 30% ofthe total; it must also ensure a return water temperatureno less than 55°C, while the requireddischarge head is quite low, as it only needs toovercome the resistance of the boiler and thevalves. To measure the effective central heatingreturn inlet temperature for the purpose of controllingthe condensate prevention pump ormanaging the functions for getting the system tostable temperature operation, a probe socketmust be fitted at a distance equivalent to 3-5times the diameter of the return pipe upstreamof the water coupling.5.6 Opening and adjusting the front doorFor the <strong>PREXTHERM</strong> <strong>RSW</strong> models 92÷1060,the door is hinged, fastened and reversed asshown in Fig. 9.The following operations are required:- The door is fitted with four equal hinges, thepins (pos. 3) are inserted either on the right orthe left of the support (pos. 1).For the direction of opening, remove the pinson the right or the left, and then fasten thedoor with the screws (pos. 6).- Axial adjustments are possible by screwing inor loosening the fastening nuts.Key (Fig. 9)1 Hinge support bracket2 Hinge3 Hinge pin4 Fastening screw and nut5 Bush6 Closing bolt and washerFor <strong>PREXTHERM</strong> <strong>RSW</strong> models 1250÷3600,the door is hinged, fastened and reversed asshown in Fig. 10.The following operations are required:- Unscrew the nuts (pos. 8) on the side thatcloses, and open the door.- Tighten the nuts (pos. 8) again on the sidethat closes, and close the door.- Tighten the spare nuts (supplied with the boileraccessories) in pos. 8, making sure theyare fully tightened.- Unscrew the nuts (pos.7) corresponding tothe part that acts as a hinge.- Open the door and unscrew the nuts (pos. 6).- Close the door and use a pair of nuts (pos. 7).Key (Fig. 10)1 Fastening dowel2 Hinge pin support nut3 Hinge support ears4 Hinge pin5 Bolt welded to the pin6 Bolt-door fastening nut7 Bolt-door fastening nut8 Bolt-door fastening nut5.7 Assembling the burner (Fig. 11)The assembly of the burner to the door of theboiler must ensure perfect tightness to the productsof combustion.Once having installed the burner on the boiler,the space between the burner draught tube andthe refractory material on the door must be filledwith the layer of ceramic fibre (A) supplied.This prevents the door from overheating andconsequently from being irreversibly deformed.The fuel connections to the burner must be locatedso as to allow the complete opening of theboiler door with the burner installed.<strong>RSW</strong> L min. (mm) L max. (mm) S92-152 230 300 172190-350 250 320 192469-600 290 360 218720-1060 320 390 2391250-1480 320 390 2481890 340 410 2622360 340 470 2623000-3600 350 480 2725.8 Connecting the flame inspection window(Fig. 12)The flame inspection window features a pressurefitting (1) to be connected via a silicone hoseor copper pipe to the outlet on the burner (2).This operation allows the air blown by the fan tocool the glass and prevent it from turning black.Failure to connect the hose or pipe to the windowmay cause the glass to break.5.9 Assembling the panels, models 92÷300Sequence (Fig. 13)a) Fasten the 2 supports (pos. 17) to the boilerplates using the corresponding screws and nuts.b) Position the bottom side panels (pos. 2 and4), hooking them to the support (pos. 17).To know which of the two sides is the right orthe left, refer to the hole for the cable glandplate (pos. 9), which must be facing the frontof the boiler.c) Position the top side panels (pos.1 and 3),hooking them to the boiler supports.d) Fasten the control panel to the top panel(pos. 5).e) Rest the top panel (pos. 5), complete with thecontrol panel, on the side panel (pos. 1),complete with springs, closing pins and nuts(pos. 14-15-16) .f) Insert the bulbs of the instruments into thesheaths, as shown in Fig. 13-20, and makethe electrical connection between the controlpanel and the power line, burner and anypumps etc. The probes should be insertedfully into the corresponding sockets, to improvecontact. Then secure the capillary tubeswith the springs. Close the cover on the electricalpanel, pass the burner plug through theside plate (pos. 9) and secure the cable withthe cable gland supplied. Fasten the plates(pos. 9) with the screws (pos. 10).g) Fit the top panel (pos. 6) to the side panel(pos. 3) complete with springs, closing pinsand nuts (pos. 14-15-16).h) Fit the rear panel (pos. 8) to the boiler usingthe screws (pos. 13) and the nuts (pos. 14).i) Fit the front panel (pos. 7) to the front door usingthe screws (pos. 11) and the nuts (pos. 12). Thepanel must be fitted before installing the burner.j) Fasten the rating label to the boiler, seeChap. 1.4, after having cleaned and degreasedthe part in question using a suitable solvent,and apply it so as to ensure perfectadhesion. Do not remove the rating label, asit will lose its adhesiveness.The rating label is included in the documentenvelope.5.10 Assembling the panels, models 350÷1060Sequence (Fig. 14)a) Fasten the 2 supports (pos. 24) to the boilerplates using the corresponding screws and nuts.b) Carefully position the bottom side panels(pos. 3 and 4 - 7 and 8), hooking them to thesupport (pos. 24). To know which of the twosides is the right or the left, refer to the holefor the cable gland plate (pos. 15), whichmust be facing the front of the boiler.c) Position the top side panels (pos. 1 - 2 and 5- 6), hooking them to the boiler supports.d) Fasten the control panel to the top front panel (pos. 9).e) Rest the top panel (pos. 9), complete with thecontrol panel, on the side panel (pos. 1),complete with springs, closing pins and nuts(pos. 20-21-22).f) Insert the bulbs of the instruments into thesheaths, as shown in Fig. 14-21, and makethe electrical connection between the controlpanel and the power line, burner and anypumps etc. The probes should be insertedfully into the corresponding sockets, to improvecontact. Then secure the capillary tubeswith the springs. Close the cover on the electricalpanel, pass the burner plug through theside plate (pos. 15) and secure the cable withthe cable gland supplied. Fasten the plates(pos. 15) with the screws (pos. 16).g) Fit the support (pos. 23)h) Fit the top panels (pos. 11-12-10), hookingthem to the side panels (pos. 2-5-6) completewith springs, closing pins and nuts (pos. 20-21-22).i) Fit the rear panel (pos. 14) to the boiler usingthe screws (pos. 19) and the nuts (pos. 25).j) Fit the front panel (pos. 13) to the front doorusing the screws (pos. 17) and the nuts(pos. 18). The panel must be fitted beforeinstalling the burner.k) Fasten the rating label to the boiler, seeChap. 1.4, after having cleaned and degreasedthe part in question using a suitable solvent,and apply it so as to ensure perfectadhesion. Do not remove the rating label, asit will lose its adhesiveness.The rating label is included in the documentenvelope.- 18 -
6. STANDARD INSTRUMENT PANEL6.1 Pannel (Fig. 15)The instrument panel supplied, made from plasticwith index of protection IP40, holds the controland safety instruments.The boiler electrical system must be:- designed and made by qualified personneland connected to an earth system incompliance with the legalisation in force.- suitable for the maximum power input of theboiler, using cables with an adequate cross-section.The earth wire in the power cables and connectioncables to the burner must be a few mm longerthan the other wires in the same cable. Forthe connections between the burner, the electricalpanel and the power supply, use H07 RN-Fcables for installation in view. For other types ofinstallation or special environmental conditions,refer to the legislation in force. The compositionand the diameter of the wires should be calculatedbased on the power input of the burner. Toaccess the instruments, rotate the front panel(A). To access the terminal block and unwindthe capillary tubes from the thermostats and thethermometer, remove the top panel (B), afterhaving unscrewed the 2 side screws (C). Thecontrol thermostats (12-13 - Fig. 16) can be setby the user, using the knob at the front. Thesafety thermostat has a fixed setting andmanual reset, as specified by Italian Min.Decree 1/12/75, collection R.The following are compulsory:- the use of a two-pole thermal-magnetic overloadswitch, mains disconnecting switch, compliantwith the CEI-EN standards (minimumcontact opening 3 mm)- observe the polarity L1 (Phase) - N (Neutral)- use cables with a minimum cross-section of1.5 mm, complete with pointed end terminals.- refer to the wiring diagrams in this booklet forany operations on the electrical system.- connect the appliance to an effective earthsystem.- the water pipes must not be used to earth theappliance.The manufacturer is not liable for any damagedue to the failure to earth the appliance and toobserve the information provided on the wiringdiagrams.A connection point is provided on the front headfor earthing the boiler body.6.2 Panel front view(Fig. 16)Key1 Pump ON switch2 Burner ON switch3 Boiler ON switch4 Test button5 Safety pressure switch reset button6 Boiler water temperature7 Boiler on LED8 1 st burner flame LED9 2 nd burner flame LED10 Burner shutdown LED11 Safety pressure switch LED12 2 nd boiler flame control thermostat TR113 1 st boiler flame control thermostat TR114 Space for temperature controller6.3 Diagram of the terminal block electricalconnectionsGB230 Vac 50-60Hz single-phase power supply (phase)230 Vac 50-60Hz single-phase power supply (neutral)230 Vac 50-60Hz single-phase power supply (earth wire)EARTH SCREW230 Vac 50-60Hz single-phase burner power supply (earth)230 Vac 50-60Hz single-phase burner power supply (phase)230 Vac 50-60Hz single-phase burner power supply (neutral)1 st flame burner operation enabling signal1 st flame burner operation enabling signal2 nd flame burner operation enabling signal2 nd flame burner operation enabling signalBurner shutdown signal2 nd flame burner operating signalMaximum currentinput 3 AmpereEARTH SCREW230 Vac 50-60Hz single-phase pump power supply (earth)230 Vac 50-60Hz single-phase pump power supply (phase)230 Vac 50-60Hz single-phase pump power supply (neutral)Maximum currentinput 3 AmpereRemote boiler start enabling signalRemote boiler start enabling signalExternal boiler safety enabling signalExternal boiler safety enabling signalJumper if not presentJumper if not presentRoom thermostat or remote start circulation systemRoom thermostat or remote start circulation systemJumper if not present- 19 -
- Page 1: PREXTHERM RSW
- Page 5 and 6: 1. PRESENTAZIONEGentile Cliente,La
- Page 7 and 8: 5. INSTALLAZIONE5.1 ImballoLe calda
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- Page 11 and 12: Legenda simboli/componenti schema e
- Page 13 and 14: ANOMALIAIL GENERATORE SI SPORCA FAC
- Page 15 and 16: 1. PRESENTATIONDear Customer,Thank
- Page 17: 5. INSTALLATION5.1 PackagingThe PRE
- Page 21 and 22: Key to the symbols/components on th
- Page 23 and 24: FAULTTHE BOILER DIRTIES QUITE EASIL
- Page 25 and 26: 1. PRESENTATIONCher client,Nous vou
- Page 27 and 28: 5. INSTALLATION5.1 EmballageLes cha
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- Page 40 and 41: 6.4 Esquema eléctrico para quemado
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- Page 45 and 46: 1. PRÆSENTATIONKære Kunde!Vi takk
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- Page 57 and 58: 5. INSTALLATION5.1 VerpackungDer Li
- Page 59 and 60: vorher mit einem geeigneten Lösemi
- Page 61 and 62: Zeichenerklärung Symbole/Komponent
- Page 63 and 64: BETRIEBSSTÖRUNGDER WÄRMEERZEUGER
- Page 65 and 66: 1. PRESENTATIEGeachte klant,Dank u
- Page 67 and 68: 5. INSTALLATIE5.1 VerpakkingDe PREX
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geschikt oplosmiddel, en het label
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Legenda symbolen/componenten op ele
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STORINGDE KETEL WORDT GEMAKKELIJK V
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1. APRESENTAÇÃOEstimado Cliente,O
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5. INSTALAÇÃO5.1 EmbalagemAs cald
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6. PAINEL DE INSTRUMENTOS STANDARD6
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Legenda de símbolos/componentes do
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ANOMALIAO GERADOR SUJA-SE FACILMENT
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1. PRESENTATIONBäste kund,Vi tacka
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5. INSTALLATION5.1 FörpackningPann
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6. STANDARD INSTRUMENTPANEL6.1 Pane
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Förteckning över symboler/kompone
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FELPANNAN SMUTSAS LÄTT NEDORSAK: B
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1. ESITTELYArvoisa asiakas,Kiitämm
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5. ASENNUS5.1 PakkausPREXTHERM RSW
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6. PERUSMITTARITAULU6.1 Mittaritaul
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Symbolien selitykset/sähkökaavion
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TOIMINTAHÄIRIÖLÄMMITYSKATTILA LI
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