A.O. Smith BFM 80 User's Manual
Contents
1. 220C FAN NO NC e O a B 5 o O L G o NEC a o x S 2 s T e Er d Gt x o 5 SECUNDAIR 15 GI G LADS ub a m9 Olli 11258 415 09 rr Hore 21 PRIMAIR 8 8 O IMAI 3 g S ohi alae GI Ao qa a HONEYWELL S4560D BRANDERAUTOMAAT 12131415 ST7 1819 Tro T2155 13 14 6 ku 3 y 1il2 3 4 IMD 0055 R1 Figure 12 Electrical connection diagram BFM 17 Figure 13 Connection diagram control column 220508 r 18 Transformer 230 Air proving switch EMC single phase filter RESET knob Thermostat frost Thermostat regulation Switch ON OFF SSIVES IMD 0063 Thermostat overheat Thermostat high limit Automatic burner controller Relay Plastic connector strip Earth terminal block 2 2 Turning the water heater on 2 2 1 Filling the water heater 1 Assemble the drain off tap and check that i2. Ei Is figure 9 Thick walled aluminium with lip ring seal Thin walled galvanised steel plate All measurements are in mm The following applies for the horizontal pipe slope of at least 5 mm per metre of pipe to the water heater NB Measurements A B are the total permissible dimensions of the flue i e when A 1 metre B 6 metres total 7 metres or A 4 metres B 3 metres total 7 metres 14 Roof discharge see figures 10 Type Manufacturer Pipe material flue tube Pipe material air supply Pipe diameter BFM 30 BFM 50 BFM 80 Angle and 11 M2000 DDV SE HR VR Meulink amp Grol Thick walled aluminium with lip ring seal Thin walled galvanised steel plate 80 125 mm 100 150 mm Q 130 200 mm 459 90 max 2 Flue configurations roof discharge BFM unit Measurement All measurements are in mm these flue configurations These will each equate to 1 metre of flue length The following applies for the horizontal pipe slope of at least 5 mm per metre of pipe to the water heater The maximum flue configuration is therefore 7000 mm A maximum of 2 bends 45 or 90 may be used with pipe 2 bends 457 905 and a lead through set p IMD 0061 Figur
3. Problem solved 4 3 Detailed fault finding INSTALLER Check voltage present at connection 1 Check voltage present after FILTER Check voltage present at gate 3 ON OFF switch voltage presen at gate 11 and 12 CONTROL ERMOSTAT Reinstate voltage supply Ensure connections correct if yes replace FILTER Ensure connections correct if yes replace ON OFF switch no 1 Check if controle thermostat is closed 2 Ensure connections correct 3 Ifyes replace CONTROL THERMOSTAT 27 yes 2 s Check Woltage present at Ensure connections correct GATE12MAXIMUM gt gt if yes replace i MAXIMUMTHERMOSTAT N THERMOSTAT PER p Check _Noltage present at S Ensure connections correct GATETBURNER y if yes replace AUTOMATION lt BURNER AUTOMATION S4560D 1150 E Check _ voltage present at Replace lt _ GATE8BURNER gt gt BURNERAUTOMATION N AUTOMATION X z P d d ho Ensure connections correct A s VENTILATING FAN jn ha if yes replace E in operation VENTILATINGFAN AC M YO fre E p Um ma a P Ensure connections _Noltage present at no 2 voltage present at no voltage present at ius if A uen GATEZ
4. Rp3 4 Rp3 4 Drain connection 3 4 14 NPT 3 4 14 NPT 3 4 14 NPT Anode 3 4 14 NPT 3 4 14 NPT 3 4 14 NPT Connection T amp P plug 1 14 NPT 1 14 NPT 1 14 Maximum working heat 8 8 Empty weight 350 Gas usage at 1013 25 mbar and 15 C For a leak tight connection European coupling pieces with pipe screw thread according to ISO 228 1 or ISO 7 1 can be used on the NPT connection nipples 2 FOR THE INSTALLER If possible use a trolley or fork lift truck to move the water heater Always move the water heater in an upright position 2 4 Installation instructions The following distances should be observed Sides of the water heater 100 cm free space for the accessibility of the hand holes Rear of the water heater 15 cm Around top box and concentric pipe 15 cm Front of the water heater 100 cm free space to take out bar burners 2 1 1 Installation Installation should be carried out in accordance with all local authority and building regulations local water authority and fire regulations and the following British standards British Gas Publication UP1 and UP2 BS 5482 part 1 1979 part 2 1979 part 3 1979 BS 6644 BS 6700 BS 6798 Diagram 5 Typical UK vented system 2 1 2 Water connections A O Smith water heaters are suitable for connection to vented unvented and pumped pressurised systems In e
5. The fan can be removed from the top box via the access panel 1 2 4 Air proving switch The air proving switch ensures that there is sufficient air flow for the safe operation of the water heater If the airflow falls below the preset value this will be detected by the air proving switch and the gas supply to both the ignition and main burners will be closed The air proving switch is preset and cannot be adjusted Air proving switches BFM units Unit Pstart Poff Pa Pa BFM 30 250 220 BFM 50 250 220 BFM 80 230 205 The air proving switch must always be fitted with the connection points downwards The air pressure differential switch must always be fitted with the connection points at the bottom while the pipe with the letter H must be connected to the point P1 Pipe L goes to connection P2 1 2 5 Gascontrol The water heaters are provided with a gas valve that regulates the gas supply to the burners The gas control has a safety valve and a gas valve and hence has a B D configuration The position of both valves can be regulated by the burner automation To ensure improved ignition the gas control valve opening mechanism is fitted with a delay softlite Figure 2 Positioning ventilation AMAA AN INT P1 Figure 3 Differential pressure switch P2 AOS 0666 AOS 0653 1 3 Te
6. the RESET button must be pressed after the water has cooled down The water heater will operate again in the usual manner 19 2 5 Checking the gas pressures The nominal load has been set at the correct value in the factory A further check of the pressure should be carried out during the commissioning of the unit A dangerous situation can occur if the following instructions are not followed carefully Setting the nominal load is possible as there is a burner pressure control If you wish to adjust the burner pressure the following procedures must be followed 1 Switch off main power by turning the I O switch to 0 position Figure 14 Checking the gas pressures 20 Connect the U tube manometer to pressure nipple Switch on main power and ensure temperature control is calling for heat Wait until water heater is firing Check pressure against table on page 10 for relevant gas and adjust at main gas valve Switch of main power as no Y Remove U tube manometer and close pressure nipple Switch on main power and test for gas tightness and correct operation Figure 14 AOS 0655 2 6 Conversion to another gas Important Install a gas valve suitable for the type of gas to be used If the water heater has to function on a gas category LP or natural gas other than the gas set as standard ex works the water heater must be converted to the applicable gas cat
7. 31 Glalms u a dat Sa ieee ils ee dd ea ea oe 31 No other guarantee or warranty either expressed or implied is made on behalf of Smith Water Products Company 31 Figure 1 TOP BOX AIRPROVING SWITCH TEMPERATURE REGULATOR ON OFF SWITCH RESET KNOB BURNER CONTROLLER GASVALVE MANIFOLD INJECTORS PILOT BURNER HORIZONTAL AIR INLET xm QI OO T AOS 0651 VENTILATION FAN ANODE FLUE TUBES FLUE BAFFLE DIAPHRAGM INSULATION BURNER AIR DIFFUSION PLATE CONDENSATE DRAIN 1 GENERAL 1 1 Description of the appliance Construction and fitting out of the storage appliance comply with the European Standard for gas fired hot water storage appliances for sanitary use EN89 The appliance thereby satisfies the requirements of the European Directive for Gas Appliances and is therefore entitled to bear the CE mark The BFM appliance is an enclosed appliance with a fan in the air inlet appliance category C43 or C33 The appliance is designed for a concentric flue configuration A diaphragm across which the pressure difference can be measured is fitted in the air inlet System When the control thermostat calls for heat the burner control un
8. BURNER gt lt GATE3AIRPROVING Z gt lt GATE1AIRPROVING gt BUBNER AUTOMATION 7 EM y SWITCH lt E si SMITH P T C p AUTOMATION D je yes Ensure connections correct DISCONNECT GAS SUPPLY P Check gt voltage present atn Replace Disconnect the pipe air GATE7 BURNER BURNERAUTOMATION supply by removing the E AUTOMATION _ lt elbow at the rear bottom NN ee Measure pressure at 22 hose H at the column yes 28 a yes Problem solved E ES E lt Does the RESET s switch light up V P yes Ensure connections correct if yes check hose H for leakkage or blockings Ensure connections correct if yes check hose L for leakkage or blockings id nsure connections I H a i lt gt GATE12ECO J correct if yes replace 300 PA E yes yes Check Measure Et at Voltage present at no lt GATE11BURNER ee H at the column AUTOMATION lt Pressure L less no thenOPA lt yes yes Check exhaust system on blockings if the exhaust system is open replace AIR PROVINGSWITCH _ voltage present at voltage present at Replace GATE10BURNER gt lt GATE2BURNER gt BURNERAUTOMATION AUTOMATION lt AUTOMATION yes yes RESET switch Ensure connections correct if yes
9. N150 or similar Non return valve Gate valve Drain valve Gas valve Cold Water Hot Water Return circulation pipe Gas supply UP OT lt CEEE 22mm IMD 0059 Figure 8 Connection diagram including destratification circulation system 13 2 1 3 Condensation drain In order to guarantee the correct operation of the water heater the condensate drain of the water heater must open into the sewer interrupted provided with an extra stench trap or siphon A condensation drain section fixed to the water heater should be fitted under the slope The condensate drain of the water heater must never be sealed 2 1 4 Gas connection The gas installation may only be carried out by a registered installer and in accordance with the relevant local authority and building regulations and followint British standards 2 1 5 Flueconnections concentric The combined flue discharge and air intake tubes concentric should always be assembled with a rising slope towards the flue terminal and in accordance with the table below Wall configuration see figure 9 Type M2000 MDV SE Manufacturer Meulink amp Grol Pipe material flue tube Pipe material air supply Pipe diameter BFM 30 80 125 mm BFM 50 Q 100 150 mm BFM 80 130 200 mm Angle 90 2 max Flue configuration horizonal discharge BFM unit Measurement 7 LID
10. The temperature is indicated by the position of the temperature dial Position 1 app 40 C Position 2 app 50 C Position 3 app 60 C Position 4 app 70 C At high temperatures more calcium precipitation is caused in the water heater Moreover the standby losses of the water heater are greater at higher temperatures It is recommended that the control thermostat be set at approximately 60 C For reasons of security the water heater is provided with a high limit and safety thermostats If the high limit thermostat operates the burner will not fire until the water has cooled sufficiently to allow the thermostat to automatically reset The water heater will then return to the control of the temperature regulator If the safety thermostat operates due to high temperature the ignition sequence must be repeated after resetting the control 24 333 Turning the water heater off For short periods 1 Turn the temperature knob fully to the left and turn the I O switch in the O position For longer periods 1 Switch off the supply voltage 2 Close the gas tap in the supply line 3 Close the water supply tap 4 If there is danger of frost drain the water heater 3 4 Maintenance The water heater must be checked and cleaned regularly at least once a year by an accredited installer so that proper operation is guaranteed The bar burners the pilot burner and the control and safety valves must also
11. be checked 4 FAULT FINDING 4 1 Fault finding USER No or insufficient hot water Check whether the electricity is turned on Check whether the gas supply is turned on Does the Does the ON OFF switch light up no Check if ON OFF switch in position 1 Put ON OFF switch in position 1 RESETswitch light up Push RESET switch up to three times Reduce the water use or increase the control thermostat A yes Is the water heater in operation no Is the water heater in operation Problem solved Is the water heater in operation Problem solved no Consultyourinstaller 25 4 2 Fault finding INSTALLER Check gas connection and the electricity supply make sure that they are switched on Does the ON OFF switch yes light up Check if ON OFF switch is in position 1 no y Put ON OFF switch in position 1 no Is the water heater in operation 26 Does the RESET switch no light up Push the RESET button up to three times Is the water heater in operation Problem solved See detailed fault finding yes Problem solved Is the water heater in operation no
12. natural gas a remove the flat covering plate with sealing on the gas control b mount the burner pressure regulator on the gas valve c See figure 16 Mount the burner tray 7 Reconnect the wiring and gas supply to the gas valve 8 Open the main inlet gasvalve 9 Check the gas inlet pressure 10 Switch on the electricity supply at the main switch 11 Commision the water heater 12 Adjust the burner pressure to the value as indicated in the technical data 13 Check the soundness 14 Check the operation of the heater 15 Fix the conversion sticker from the conversion kit below the rating plate to the heater so that is clear on which gas category the heater operates 9 AOS 0546 Figure 15 mounting covering plate with sealing on the gas valve AOS 547 Figure 16 mounting burner pressure regulator on the gas valve 21 27 Maintenance The water heater must be checked and cleaned regularly at least once a year by an accredited installer so that proper operation is guaranteed The bar burners control and safety valves must also be checked see figure 17 2 8 Anode The life of the anode is determined by the quality and the quantity of water flowing through the water heater Therefore we recommend that the anode is checked regularly preferably simultaneously with an internal inspection of the enamelled tank In order to determine the frequency with which the anodes must be
13. MODELS BFM 30 BFM 50 BFM 80 INSTALLATION INSTRUCTIONS AND USERS MANUAL UNITED KINGDOM CLOSED COMBUSTION WATER HEATER INTRODUCTION Read the installation instructions before installing the water heater Read the user instructions before lighting the water heater If these instructions are not followed carefully this may lead to explosion and or fire and can cause material damages and or physical harm Installation and commissioning should be carried out by a registered installer The type of gas and standard values which the water heater from factory is set on are stated on the type plate The BFM models fall under the instrument category C13 C33 These water heaters are provided with an ignition system SMITH DOES NOT ACCEPT ANY RESPONSIBILITY FOR GUARANTEE SERVICE PROVISION AND OR PRODUCT LIABILITY INCASE OF UNAUTHORISED PRODUCT MODIFICATION OR REPAIRS CONTENTS OQ G N N 2 1 2 1 1 2 1 2 2 1 3 2 1 4 2 1 5 2 1 6 2 2 2 2 1 2 2 2 2 2 3 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 3 1 3 1 1 3 1 2 3 1 3 3 2 3 3 3 4 4 1 4 2 4 3 5 1 5 2 5 3 5 4 5 5 5 6 5 7 GENERAL Water heater description u ei eer iu E m h uhaq usa qalas 5 Technical safety Equipment cuu u un uuu ai u eerte then cec decease iae ten 6 Gas conttol u et Bs ee EE de SR ae SE 6 Gontrol LED 6 Burner 6 Air proving s
14. WIto ly eR ee ed Lea eh aym qaa iu uq unan 6 Gas control valve ineo quay i Gua hu uyu sven mauka 6 Technical description in iiic ec e oce eee ite oe ss RE eases 8 Measurements tusa unu E i Pe m aui dust feiert ein tie 8 Techiiical data Oe e ie ed E RH Eoo cu ede od Ue quc 10 FORTHEINSTALLER Installation instr ctlOhs 2 inten eie aes eter pk re De RR dde e riesce eet em 11 InstallatlOn 4 cm ERR E ur DRE RE GIAN Le e d s 11 Water connection C Eig 11 Condensation drain iui edere uay Eb 14 Gas connection enn uu Ae Ae a al D i eo Bs Ret 14 Flue connection CODnCentrlc ux a c qaa Dated en t dnd qa oan uqa 14 Electrical connection coi e reete oe erp ae ee xD eve tes eee 16 Turning the water heater on u Sulu Saphana lai nnne nitent en nnne nennen nnns 19 Filling the water heater o nere i etit e RE ERR 19 Turning the water heater nennen nnne nennen nnne t nnne n tenentes nennen nennen ne 19 Setting up thie pilot fl me 5 deen Ged AG A Tp ctt ee haga EORR ERE a 19 Turning the water heater i i a e ed ntn 19 Usage temperatire Controlin uoce or ngrana eo Eae denas peser e det sedit a 19 Checking the gas pre s res_ l ul N nennen nennen nen
15. ach case appropriate valves and fittings should be used to ensure the system complies with the requirements of the water by laws and appropriate building regulations When fitting it is essential the rules of good practice are applied at all stages of installation Vented systems If the water heater is to be connected to a cold feed tank or cistern the hot water supply pipe must include an open vent which discharges over the cold feed cistern The cold feed cistern must have an actual capacity of greater volume than the hourly recovery rate of the water heater s which it supplies The minimum actual capacity is 50 gallons or 227 litres See diagram 5 A O Smith water heaters are tested to a maximum pressure of 12 bar and a maximum working pressure of 8 bar Dead legs on a hot water installation are undesireable Where possible they should be avoided Where the inclusion on the system of a dead leg is unavoidable the following restrictions should be applied for pipes not exceeding 19 mm inside diameter maximum lengh of dead leg permitted 12 0 metres for pipes exceeding 19 mm but not exceeding 25 mm inside diameter maximum length of dead leg 7 5 metres for pipes with an inside diameter exceeding 25 mm maximum dead leg 3 0 metres Gas cock Stop valve Three way vent valve T amp P valve Non return valve Circulation pump Drain valve CI ULP Gas supply Hot Water Cold Water Overflow Return circulati
16. ater 1 Assemble the drain off tap and ensure it is closed 2 Open the cold water tap to the water heater and open all taps on hot water drain off points to vent them Theheater is filled as soon as cold water pours out of all drain off points 3 Close all taps at hot water drain off points The heater is now under water supply pressure At this pressure the relief valve if fitted may not release water 3 1 3 Turning the water heater on 1 Check that the water heater is filled with water and that the gas pipe to the water heater is open 2 Turn the temperature control knob fully to the leftl 3 Turn on the supply voltage by turning the main switch NOTE if the frost thermostat has been turned on the burner automation will immediately start its ignition procedure 4 Turn the I O switch on the column in the T position The control lamp in the switch will now light 5 Turn the temperature control switch in the desired position preferably position 3 approximately 60 C The ventilation fan will start the water heater will ignite and work automatically 3 2 Usage The water temperature is controlled via the temperature regulator If the temperature in the water heater falls below the set value the temperature regulator call for heat The burner automation will operate firstly the ventilation fan for its purge cycle then a spark will ignite the pilot burner The softlite control then ignites the main burner
17. chnical description 1 3 1 Measurements See figure 4 1995 1995 1795 1795 600 600 600 520 520 525 600 600 590 1640 1640 1655 1360 1360 1360 630 630 625 710 710 710 1000 1000 1000 755 755 755 80 125 100 150 130 200 Cold water inletRP1 Hot water outletRP 1 Gas valve RP 3 4 Drain valve 34 14 NPT A B G D E F G H K L M N 1 2 3 4 5 All dimensions in mm rounded up to the nearest 5 mm T amp P connection temperature and pressure valve 1 14 NPT 1 3 2 Technical data Heater category ll Description DATANATURAL GAS G20 Nominal gas inlet pressure Burner pressure Input 29 47 75 Output to water 27 42 68 Gas consumption 3 0 4 7 7 9 Diameter main injector 2 60 2 50 2 70 Diameter injector ignition burner 0 56 0 41 0 56 0 41 0 56 0 41 Heating time AT 45 C 35 25 12 DATAPROPANE BUTANE G30 G31 Nominal gas inlet pressure Input Gas consumption Diameter main injector Diameter injector ignition burner GENERAL Storage capacity Number of bar burners 3 5 Number of anodes 2 2 Number of flue tubes 5 7 16 Water connections Rp11 2 Rp11 2 Rp11 2 Gas connection Rp3 4
18. e 10 and 11 Roof discharge IMD 0062 2 1 6 Electrical connection All electrical connections must be carried out by a registered electrical contractor to the relevant regulations The BFM must be connected to a supply voltage by means of a permanent electric connection and have a feeder cable not less than x 1 0 mm2 Supply voltage Supply network Minimum fuse frequency required 220 240 VAC 50 Hz 1A The electrical diagram of the BFM heater and the connections in the control column are shown in figures 12 and 13 Electrical connection diagram BFM see figure 12 A Jacket Transformer 230V 238V 2VA Air proving switch EMC single phase filter RESET knob Thermostat frost Thermostat regulation Switch ON OFF Thermostat overheat 93 C Thermostat high limit 84 C Automatic burner controller Plastic connector strip Earth terminal block Relais GOVEZSCSEOQINGOS Colour code cables 1 Blue 2 Brown 3 Yellow green 4 Red 5 White 6 White orange 7 White violet Black 9 Black green Black red 1 Black white 16 PVC PVC
19. e 17 AOS 0663 setting of 60 C is recommended which will keep calcium deposition to a minimum Inspection hatches are located on the right and left sides for inspecting and deliming the tank The hand holes can be reached via the covering plates on the outer jacket Empty the water heater before opening the inspection hatches Deliming must be executed with the correct tools Consult the supplier of the water heater or the installer on this matter In order to guarantee a water tight seal of the hand holes the rubber O rings in the hand holes must be replaced see figure 17 22 Figure 18 Maintenance anodes AOS 0333 2 10 Condensation If the water heater has been filled with cold water or if the hot water usage has been very high normally condensation of the flue gasses will occur on the cold sides of the combustion chamber and the flue tubes The water drops will fall on to the burner bed which can cause a hissing sound This is normal and will disappear as soon as the water heater has reached its operating temperature again 2 11 Spare parts To order spare parts it is important to state the water heater type model and the complete serial number AOS 0373 Figure 19 Maintenance anodes 23 3 FOR THE USER 3 1 Instructions for use Installation and commissioning of the water heater should only be undertaken by a registered installer 3 1 2 Filling the water he
20. e 20 Conversion to ahother gas aote het ed cte e e D Ee b eere E asua ne 21 Maintenance unu hte den OE DRE element 22 nite ete el pets d dis iu E edens 22 Descale procedure e RERO REIR eH rg Bine 22 Conderisatlor 5 eer RD alea edt Ee u N ia tonto te eod 23 Spareparts sth moie on atta ei Realities eave tne Mete 23 FORTHE USER Instructions for USO HERE ERE BLUR RE EM URN RR Rr cabe 24 Warning au rE E 24 Filling the water heater shave iactacdesbeg depts seid adaccaasbecsapezecdhasisissibershateieaedviense 24 Turning the water Kaerat te eukera aiana aaaea nnne nnn 24 Usage ced aere rd fttt use red eom ied eate the cohetes ott etta e rss 24 Turning the water heater olff u 24 Maintenance p EE 24 FAULTFINDING AND CORRECTION Fault finding serl u 25 Fault finding ristaller enter ein eee p e RE e elt 26 Detailed fault finding Installet et epe E HR MEME 27 WARRANTY Guarantee in general uuu decet Ee c e a recon n a oed 31 Guarantee of the Tank c oet peperere Gi Pe dr e Eee toten nd eran aed 31 Conditions for installation and USE is isre srein nnne nenne nennen 31 EXCIUSIONS URP GA t te tex Ee Qusa nii au ees ui Den 31 Range of the guarantee ire RERO FUSE ERR RI MESTRE REC
21. egory with the associated conversion kit s Only an accredited installer may convert the heater All the injectors of the main burner bars and the injector of the ignition pilot must be replaced Regurlary natural gas units do have a burner pressure regulator but LP gas units do not The burner pressure regulator on the gas control must be removed when converting the heater for use on LP gas if present The burner pressure regulator must be fitted on the gas control when converting to natural gas if required The table with technical data shows which injectors must be fitted for the gas category in question Procedure 1 Shut the water heater down close the main inlet gas valve and switch of the electricity supply at the main switch 2 Remove the burner tray including the gas valve a remove the screws of the burner tray housing b loosen the wiring of ingition and ionisation pen on the burner controller c loosen the gas control cable d dismount the gas supply to the gas valve 3 Remove the burner tray from underneath the heater 4 Replace the main injectors and the injector of the ignition burner Use the table with technical data to check that the diameter of the injectors is correct 5 Converting from natural gas to LP gas a remove the burner pressure regulator on the gas control b mount the flat covering plate with sealing provided in the conversion kit c see figure 15 Converting from LP gas to
22. it carries out a zero position check The fan is subsequently switched on and at a signal from the pressure difference switch the pre ventilation period minimally 30 seconds commences Following the pre ventilation period the burner control unit switches on the ignition transformer whereby the first gas valve the pilot opens On receiving an ionisation signal from the ignition burner the second main burner gas valve opens The appliance is now in operation Technically this appliance falls into gas category llo the appliance is therefore suitable for natural gas as well as propane and butane gases The storage appliance is suitable for working pressures to 8 bar A connection is provided for the optional fitting of an extra safety feature the temperature and pressure valve The interior of the tank is enamelled for corrosion protection and a number of magnesium anodes are fitted to the tank for the same purpose A thick polyurethane insulating layer between the tank and its steel casing prevents unnecessary heat loss If the storage appliance is completely filled with water it is under continual mains pressure When hot water is tapped off the appliance cold water is immediately introduced Turbulence strips are placed in the fire tu bes for the efficient transfer of heat The flue gases pass their heat to the water by conduction and radiation The flue gases are led to the flue via the top box The burner bed consists of a n
23. ithin the terms of warranty detailed above A O Smith Water Products Company will not be liable by virtue of this guarantee or otherwise for damage to any persons or property when arising out of contracts or tort The terms of this guarantee do not effect your statutory rights under United Kingdom Consumer Legislation This guarantee applies to the following models BFM 30 BFM 50 BFM 80 31 32 0305 664 R0
24. nd does not have to be checked 2 3 Turning the water heater off For short periods 1 Turn the temperature knob fully to the left and turn the O switch in the O position For longer periods 1 Switch off the supply voltage 2 Close the gas tap in the supply line 3 Close the water supply tap 4 If there is danger of frost drain the water heater 2 4 Usage temperature control The water temperature is controlled via the temperature regulator If the temperature in the water heater falls below the set value the temperature regulator will call for heat The burner automation will operate firstly the ventilation fan for its purge cycle then a spark will ignite the pilot burner The softlite control then ignites the main burner The position of the temperature control knob coincides with the following temperatures Position 1 app 40 C Position 2 app 50 C Position 3 app 60 C Position 4 app 70 C At high temperatures more calcium precipitation is caused in the water heater Moreover the standby losses of the water heater are greater with higher temperatures It is recommended to set the control thermostat at approximately 60 C For reasons of security the water heater is provided with a high limit and safety thermostats The high limit thermostat is an extra control set at 80 C and will operate in the event of excess temperature within the water heater If the safety thermostat operates
25. on IMD 0065 mgoso 11 Depending on the length and insulation of the water piping and the water demand frequency it may be necessary to install a circulation system on the drain cock The return pipe of the circulation piping can be fitted on the top of the drain cock after the sealing plug has been removed see figure 6 Unvented To install an A O Smith water heater on an unvented cold water supply system a kit of valves and fittings listed by the water research centre and complying with part G3 of the current building regulations and BS 7206 should be used Installation should be carried out generally as shown on diagram 7 Kits are available from A O Smith or our distributors Gas cock AOS 0660 Stop valve Expansion vessel T amp P valve Figure 6 Non return valve Circulation pump Drain valve Pressure limiting valve Expansion valve CSO S Gas supply Hot water Cold water SQ Hot water supply Return circulation mgosos IMD 0066 RO Diagram 7 Connection diagram unvented system 12 Depending on the water demand pattern e g small amounts frequently it may be necessary to circulate the water in the water heater to prevent temperature stratification Therefore we recommend that a circulation system is installed in the event of such demand patterns see figure 8 Kits are available from A O Smith or our distributors _ Pump type Grundfos UP 20 15
26. orn or erroded by 5096 of more at any point of their length 5 4 Exclusions The guarantee will be null and void a ifthe water heater has been damaged by an external cause b in case of misuse neglect including frost damage or incorrect use of the water heater C in case of unauthorised alteration modification or repair d in case of ingress into the water heater of chemicals pollutants or contaminants if the hardness of the incoming water is or has been softened below 106 ppm CaCO f ifthe water heater is effected by corrosive vapours such as those found in hairdressers dry cleaners and laundries or where some industrial degreasing products are used and stored for further information and advise please contact the A O Smith Technical Department 5 5 Range of the guarantee All replacement water heaters supplied under the terms of this warranty will be supplied ex stock on an F O B basis A O Smith accepts no responsability for carriage labour or other installation costs 5 6 Claims Any claim under this warranty should be initiated with the dealer who originally sold the water heater or with any other dealer or stockist of the warrantors products 5 7 No other guarantee or warranty either expressed or implied is made on behalf of A O Smith Water Products Company With respect to the water heater in question further A O Smith does not guarantee this water heater as suitable for purpose except w
27. rantor will exchange such part or component 5 2 Guarantee of the tank If within 3 years of the original installation date the tank fails due to rust or corrosion from the water side the warrantor will supply a complete new water heater of equivalent size and duty excluding delivery and installation charges On the replacement water heater a guarantee will be granted sufficient to cover the unexpired portion of the original 3 year guarantee of the originally installed water heater 5 3 Conditions for installation and use The guarantee applies to the water heater only while it remains in its orignial location and is installed in accordance with local plumbing and building regulations and all relevant Codes of Practice The water heater should also have been used only a for potable water free to circulate at all times and with the tank free of damaging scale deposits b at temperatures not exceeding the maximum setting of its thermostat and ECO Energy Cut Off device c at water pressures and or energy inputs which do not exceed those stated on the rating plate of the water heater d in a non corrosive atmosphere or area e with an approved temperature and pressure relief valve of adequate capacity not exceeding the working pressure rating shown on the water heater and installed in conformity with A O Smith Water Products Companies installation instructions f when anode s have been inspected and renewed if they are w
28. replace RESET the water heater and wait one cycle advanced Fault Finding 29 ES Re instate gas supply and reset water heater ter in i Gas supply DR in operation 4 Ey present 2 yes TE Problem IONISATION PROBLEMS solved Carry out 3 RESET cycles to make 30 sure the pilot is provided with gas Check gasconnections towards the pilot burner Carry out one more RESET cycle If no operation is valid replace the entire PILOT BURNER assy RESET water heater after replacing the PILOT BURNER Water heater no in operation ye 22 SL d ps Problem solved gt gt lt SECUNDARY CIRCUIT gt TRANSFORMER Check SK E voltage on lt PRIMARY CIRCUIT 4 S yes _ Check gt voltage N V 4 Nes Ensure connections correct TRANSFORMER 7 Ensure connections correct If yes replace transformer Problem Solved 5 WARRANTY The following conditions form the guarantee agreement between A O Smith Water Products Company the warrantor and the owner of the water heater 5 1 Guarantee in general If within one year of the original installation date of the water heater any part or component other than the tank shall prove upon examination by the warrantor or authorised agent to be defective in material or work manship the war
29. replaced the water side of the boiler must be checked three months after installation The anodes must be replaced if more than 50 has dissolved at any point on their length Procedure 1 Shut off the cold water supply tap 2 Completely empty the water heater by means of the draw off tap Remember to ventilate the water heater 3 Remove the sealing plates at the hand holes on the outer cover of the water heater 4 Open the hand holes and inspect the anodes In order to guarantee a water tight seal at the hand holes the rubber O rings must be replaced see figure 18 If the anodes need replacing 1 Disassemble the concentric flue tube 2 Disassemble the electrical connection of the ventilation fan on the top box 3 Loosen the fastening bolts of the top box 4 Remove the top box the positioning of the anodes will now become visible see figure 18 5 Loosen the anodes with suitable tools and replace with new ones NOTE the anodes must be in contact with the tank metal on metal For if the anodes and tank are electrically separated as a result of the sealant used the anode cannot perform its function This can shorten the life span of the tank 6 Assemble everything in reverse order 7 Fill the water heater 29 Descale procedure Calcium deposition depends on the type of water and the demand In addition calcium deposition increases at high water temperatures A temperature Figur
30. set point the water heater is turned off If the flame extinguishes whilst in operation both the safety pilot valve and the gas valve will close immediately If the control thermostat is still calling for heat the burner automation will repeat the ignition procedure f no flame is detected within the safety time of 50 seconds the burner automation will interlock and the reset knob will light up As long as the air proving switch does not operate remains closed the burner automation will remain in the waiting position while the ventilation fan continues to work Aninterlocking of the burner automation can be cancelled out by pressing the reset knob If the procedure does not succeed immediately wait at least 15 seconds before pressing the interlocking knob again If the flame detection falls out during normal operation the burner automation will automatically repeat its ignition procedure As long as a flame is detected within the safety period of 50 seconds the automation will continue to repeat the ignition proce dure As soon as the water temperature has reached the set value the burner automation will close the gas valves The control column has a potential free contact for external error message 1 2 3 Ventilation fan The ventilation fan is installed in the top box When heat is required the ventilation fan is switched on by the burner automation The fan switches off when the main burner has extinguished
31. t is closed 2 Open the cold water tap to the water heater and open all taps on hot water outlet points to vent them The heater is filled as soon as cold water pours out of all outlet points 3 Close all taps at hot water draining points The heater is now under water supply pressure At this pressure the relief valve if fitted may not release water 2 2 2 Turning the water heater on 1 Check whether the water heater is filled with water andwhether the gas pipe to the water heater is open 2 Vent the gas pipe by opening the pressure gauge nipple at the inlet side of the gas valve Close the pressure gauge nipple as soon as the gas pipe has been vented 3 Turn the temperature control knob fully to the left 4 Turn on the supply voltage by turning the main switch NOTE if the frost thermostat is calling for heat the burner automation will immediately start its ignition procedure 5 Turn the I O switch on the column to the T position The control lamp in the switch will light 6 Turn the temperature control switch to the desired position preferably position 3 approximately 60 C The burner will ignite the water heater will now work automatically 7 Check the standing pressure with a manometer which can be connected to the pressure gauge nipple Check that the working pressure is set to the correct level see table page 10 2 2 3 Setting up the pilot flame The pilot flame has been adjusted in the factory a
32. ttings 1 4 approx 40 C to 73 C The frost protection ignites the burner if the water temperature drops below 20 C The switch temperature of the high limit thermostat is 84 C the overheat thermostat cuts in at 93 C The sensor for the control frost thermostat is located at the level of the control switch the sensors for the high limit and overheat thermostats are located near the top of the water heater The control box is fitted with an ON OFF switch 1 0 At setting 1 the gas control operates on the basis of heat demand from the control thermostat At setting 0 the water heater is switched off The burner will only ignite on the basis of heat demand from the frost protection When the control thermostat calls for heat the water heater checks all controls are in the off position Power is then switched to the ventilation fan Immediately the air pressure switch opens The purge cycle starts This runs for between 30 and 60 seconds after which the safety valve opens and the spark generator is operated Gas flows to the pilot burner where it is ignited by the spark generator The ionization probe now detects the flame switches off power to the spark generator and opens the main gas valve A softlite staged ignition control prevents explosive ignition by allowing a small percentage of total gas rate into the combustion chamber initially followed by the full rate when combustion is established When the water temperature reaches the
33. umber of bar burners An injector is screwed into the manifold ahead of each burner which ensures correct mixing of gas and primary air through injection into the burner inlet venturi Secondary air is drawn between the bar burners An air distribution plate which also functions as a radiant heat shield is fitted below the burners Any condensation water produced is captured beneath the combustion chamber and led away via a siphon see illustration 1 1 2 Technical safety equipment 1 2 1 Gas control The water heaters are equipped with a gas control valve which regulates the flow of gas to the burner The combination gas control is equipped with a safety valve gas control valve pilot safety valve and burner control on a standard natural gas setting 1 2 2 Control box For safety purposes water heaters are always fitted with three thermostats a control thermostat a high limit thermostat and an overheat thermostat The desired water temperature is set with the control thermostat To protect against freezing the control thermostat is also fitted with frost protection which ignites the burner when the water temperature drops to 20 C irrespective of the thermostat s temperature setting The overheat thermostat prevents the water reaching too high a temperature Should both control and high limit thermostats malfunction the overheat thermostat will automatically shut down the water heater The control thermostat can be set at se
Download Pdf Manuals
Related Search