A.O. Smith EQ 380 G Installation and Use Manual
Contents
1. Inlet pressure G31 Burner pressure G31 Gas consumption G31 Diameter main orifice G31 Diameter pilot orifice G31 Warming up time AT 45K 10 DESCRIPTION GENERAL Storagecapacity 265 355 xx Waterconnections 1 14 NPT 1 14 NPT Gasconnection ISO 7 Rp 77 ISO 7 Rp 7 Draintap 3 4 14 NPT 34 14 Anode 3 14 NPT 34 14 NPT T amp P plug 8 14 NPT 9 14 NPT Maximum working pressure 8 8 Empty weight 153 178 Gas consumption at 1013 25 mbar and 15 C xx Foraleak proof sealed connection European coupling pieces can be used on the NPT connection nipples with a pipe thread of ISO 228 1 11 2 FORTHEINSTALLER 2 1 Installation instructions This water heater must be fitted in a location which will permit the provision of an approved flue system and adequate ventilation A service clearance of 15 cm at the sides and rear of the unit and 60 cm at the front of the unit should be allowed for ease of servicing Adequate distance must be allowed between the top of the unit and any obstruction or ceiling to allow the flue baffle and anode to be inspected cleaned or in the case of the anode replaced if necessary The water heater must stand on a level surface resistant to heat and with sufficient strength to support the weight of the unit when full of water This water heater must not be installed in2. f when anode s have been inspected and renewed if they are worn or erroded by 5096 of more at any point of their length 4 4 Exclusions The guarantee will be null and void a if the 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 60 ppm CaCO f if the 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 S 4 5 Range of 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 4 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 4 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
3. VA N A 11 a h 6 7 2 Ac 12 13 A AT 7 2 14 0478 Drawing 1 Cross section of the appliance Draught diverter 8 T amp P safety connection Hot water outlet 9 Steel jacket Insulation material 10 Flue baffle Flue tube 11 Sacrificial anode Glass lined tank 12 Drain tap Gas control valve 13 Atmospheric burner Cold water inlet pipe 14 Pilot light burner with thermocouple 1 2 Technical safety equipment Gas control block The water heater has been fitted with a gas control block consisting of a thermo electrical pilot flame safeguard pilot flame pressure regulator burner pressure regulator a control thermostat adjustable between 30 C and 71 C and a safety thermostat 82 C This gas control block with its simple and secure control respectively switches the gas supply to the main burner on or off This gas control block is suitable for gasses from the first second and third gas family The maximum inlet pressure is 50 mbar Thermal Reflux Safeguard The heater is fitted with a flue gas blowback safety device The functioning of the safety device is based upon the principle of the Thermal Reflux Safeguard TRS for short shown in Fig 2 This TRS can be recognized by the copper coloured spiral that is fitted to the lower edge of the draught diverter The spiral is connected to a thermostat by means of a capillary tube The wiring of the thermostat must be connected
4. f position Check the burner pressure setting see drawing 9 and if necessary adjust this in accordance with the technical data see page 10 Place the temperature control button in the correct position preferably position 4 approximately 60 C The appliance will now operate fully automatically AOS 0484 Drawing 6 Operation of the gas control block 15 2 3 Pilot adjustment The pilot can be adjusted by means of the regulating screw under the plastic cover on the right hand side of the gas control block Turn the screw clockwise to reduce the gas pressure and anti clockwise to increase the pressure Care should be taken to ensure the pilot covers the thermocouple element correctly 2 4 Putting out of operation 1 For short periods of time the control knob should be turned to the pilot keeps burning 2 For longer periods of time the knob should be turned to the e position the pilot is extinguished 3 Close the gas tap in the supply pipe In case of longer interruptions or in the event of risk of frost it is recommended to also close the cold water tap and to drain the appliance after cooling open the drain tap it is possible to connect a drain hose to the drain tap open the nearest hot water drain point to prevent air locks To be able to drain the appliance completely it should be disconnected and tilted slightly in the direction of the drain tap 2 5 Temperature regula
5. Smith does not guarantee this water heater as suitable for purpose except within 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 25 26 Important This form should be filled in completely within two weeks of installation SERIALE NUMBER doeet ABAKADA ANAN ALANO NARRA NANANA ORIGINAL DATE OF INSTALLATION NAMEOWNER a teen ee AR etn d eee te erede ADDRESS E ii eH e eie ee STAMP INSTALLER ettet ttti tnis 27 0308 645 RO
6. a bath room bedroom or in a cupboard opening on to such rooms This water heater must not be installed in any area where flamable materials are used or stored Insufficient ventilation may give rise to a risk of fire explosion or suffocation If in doubt consult the national and local regulations governing the installation of gas appliances or your local British gas service depart ment 2 1 1 Installation The installation of this water heater should be carried out by a suitably qualified competent person It is a criminal offence for unqualified persons to install gas equipment 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 5440 5546 12 6644 6700 6798 and 6891 Some chemicals produce vapours which can cause rapid failure of thermocouples burners and storage tanks if they are drawn into the combustion air supply Therefore if this water heater will be used to supply hot water to hairdressers dry cleaners industrial degreasing processes or any other area where compounds containing halogens are used and stored care should be taken that all primary and secondary air is drawn from outside atmosphere free of such contaminents For further advise contact A O SMITH 2 1 2 Water connections A O Smith water heaters are suitable for connection to vented unvented and pum
7. ignite the burner 3 Check the burner pressure and if necessary reset by means of the adjusting screw pr adj pressure adjustment see drawing 9 To make this possible the temperature control knob should be removed by pulling it straight forward making the pr adj visible Turning clockwise reduces the pressure turning anti clockwise increases the pressure It is recommended to check the heat input by means of the gas meter 4 Tum off the appliance and remove the manometer hose and replace the adjusting screw 5 Relace the thermostat control knob 6 Put the appliance into operation 2 7 Converting to another type of gas For conversion of the appliance from natural gas to another type of gas or vice versa it is necessary to exchange the pilot injector and the main injector The conversion may only be executed by a qualified competent person AOS 0486 Drawing 9 Setting the nominal load 17 Inletpressure Burner pressure Diameter main injector Diameter pilot injector Procedure 1 Close the main gas tap in the gas supply 2 Demount the burner see Cleaning 3 Replace the injector of the main burner and the pilot burner with the correct injectors from the conversion set see table above Conversion from natural gas to LP gas Put the pressure regulation of the gas control block out of operation To do this the temperature regulating knob should
8. position preferably position 4 The appliance now operates fully automatically Control knobin position e Putthe appliance into operation Fluesafety device closedthe gas supply Press the reset button if present on the safety thermostat and put the appliance into operation If this occurs more often then you should inform your installer Gas supply closed Open the gas tap and putthe appliance into operation Safety thermostat has closed the gas supply because the water temperature was too high Setthe temperature regulator at a lower temperature and reignite the pilot burner Hot water storage empty Reduce the consumption of hot water Allow the appliance time to heat the water Cause cannotbe determined Condensation of flue gasses Turn the control button to the position Close the gas tap andinform your installer See Condensation Insufficient sealing ofthe water connections thread Tightenthethreadedconnections Leakage from other water appliances orpipes nearby Tracethe cause 23 4 GUARANTEE The following conditions form the guarantee agreement between A O Smith Water Products Company the warrantor and the owner of the water heater 4 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 t
9. to the thermocouple circuit AOS 0479 Drawing 2 Gas control block with T R S 1 T R S thermostat 2 Sensor T R S thermostat 3 Thermocouple with built in interrupter 4 Thermocouple 5 Gas control block 6 Reset button 7 Pilot burner 8 Temperature regulator knob It is the aim of the T R S to prevent flue gasses from the water heater entering the room where the water heater has been placed instead of passing through the flue to outside atmosphere The thermo couple circuit is interrupted and the gas supply is disconnected as soon as the T R S is activated by heating of the sensor by the hot gasses After the cause of the reentry of flue gasses has been traced the device can be put back into operation again In case of T R S the RESET button has to be pressed first If this failure occurs frequently this indicates that the flue suffers from down draught conditions We advice that necessary remedial actions be carried out by a competent person Important If the water heater is put out of operation by a failure this may be caused by the T R S If there is a RESET button on the thermostat this is visible because the button rose The device can be put back into operation by pressing the RESET button The T R S should never be put out of operation Reentry of flue gasses to the building could be harmful and cause poisoning or death Attention Instruction addition for inst
10. Fit the outer door 7 Turn the control button to the ON position 8 Place the temperature control button in the correct position preferably position 4 approximately 60 C The appliance will now operate fully automatically o 3 2 Use The appliance is under water 22 supply pressure with a maximum of 8 bar The amount of cold water that is added is equal to the amount of hot water used The gas control block automatically regulates the gas supply The main burner will ignite as soon as a reduction in water temperature is sensed by the control thermostat The main burner will shut down as soon as the water temperature returns to the preset temperature Position 1 approximately 30 C Position 2 approximately 40 C Position 3 approximately 50 C Position 4 approximately 60 C Position 5 approximately 70 C Higher water temperatures will cause more scale build up in the appliance It is for this reason that it is recommended to place the temperature control knob in position 4 as the accumulation of scale will be reduced at lower temperatures In addition a safety thermostat has been fitted This thermostat completely shuts off the gas supply if the water temperature reaches 82 C also extinguishing the pilot burner 3 3 Putting out of operation 1 For short periods of time the control knob should be turned to X the pilot keeps burning 2 For longer periods of time the knob should be tu
11. MODELS EQ 280 G EQ 380G INSTALLATION AND USER INSTRUCTION UNITED KINGDOM IRELAND WATERSTORAGE HEATERS Read these installation instructions first before installing the appliance Carefully read the user instructions before igniting the appliance Failure to follow these instructions may lead to risk of explosion and or fire and could cause material damage and or bodily harm Installation and commissioning should be carried out by a qualified competent installer The type of gas and the value at which the appliance is set standard in the factory are registered on the rating plate The appliance may only be installed in a room if this room meets the ventilation requirements A O SMITH ACCEPTS NO RESPONSIBILITY FOR WARRANTY SERVICE AND OR PRODUCT LIABILITY INCASE OF UNAUTHORIZED ALTERATIONS PRODUCT MODIFICATIONS ORREPAIR 2 CONTENTS PAGE 1 General AAA Behn nae iu 1 1 Description of the appliance 1 2 Technical safety equipment 1 3 Technical description 1 3 1 Dimensions A 1 3 2 gt Technicalidata oS ERO eae dein Hana 2 Fortheinstall r io tee dd Manoa Phan 12 2 1 Installation instructions sesssssssesssseeeeeeeneeneenee eene 12 Pa 12 2 1 2 Water connection 12 21 3 Gas CONNECTION rer een TIA ANNA ANAN 13 2 1 4 Flue system sssssssssseeeeeeenneeennenneee nennen rennen nennen ete
12. aller Fitting the Thermal Reflux Safeguard 1 Remove the two screws from the lid 2 Position the support with pre assembled TRS onto the lid 3 Secure the support using both screws 4 Interconnect the male and female connectors on the lid 1 3 Technical description 1 3 1 Dimensions These water heaters are only suitable for a flue tube with minimal the announced diameter dimension G Dim zie fig 3 Cold water inlet Warm water outlet Gas control block Drain tap T amp P relief valve tapping Oc 2 om c jo zzE r gt All dimensions given mm rounded off on 5 mm I AOS 0481 Drawing 3 Dimensions 9 1 3 2 Technical data Device category 2 3 DESCRIPTION DATA NATURAL GAS G20 20 mbar Nominal heat input lower value Nominal power Inlet pressure G20 Burner pressure G20 Gas consumption G20 Diameter main orifice G20 Diameter pilot orifice G20 Warming up time AT 45K DATA BUTANE G30 30 mbar Nominal heat input lower value Nominal power Inlet pressure G30 Burner pressure G30 Gas consumption G30 Diameter main orifice G30 Diameter pilot orifice G30 Warming up time AT 45K DATA PROPANE G31 37 mbar Nominal heat input lower value Nominal power
13. be pulled straight forward Turn the no pr no pressure regulation screw down tight see drawing 10 Seal this setting with lacquer Remount the burner in reverse order Open the main gas tap 18 Conversion from LP gas to natural gas Put the pressure regulator into operation To do this the temperature regulating knob should be pulled straight forward Next the red plastic cover that is now visible should be removed Turn the no pr no pressure regulation screw completely up see drawing 10 Seal this setting with lacquer Remount the burner in reverse order Open the main gas tap Set the correct burner pressure see table above If necessary adjust the pilot correctly see Pilot adjustment Fit the correct sticker from the conversion set on the appliance so that it is clear that the appliance has been converted and on which gas the appliance operates 2 8 Maintenance To ensure safe and efficient operation of the water heater it is recommended that it is cleaned and serviced at least once a year by a qualified competent person 2 8 4 Sacrificial anode The life cycle of the anode is determined by the quality and the quantity of the water flowing through the apparatus It is therefore recommended that the anode be inspected and replaced if necessary at least once a year 1 Close the stop cock in the cold water supply pipe 2 Open the neare
14. e flue tube The water drops will fall on the burner and cause a sizzling noise This is a normal phenomenon that will disappear as soon as the appliance reaches its normal operating temperature 2 13 IMPORTANT WARNING The applicance should NEVER be taken into operation with a closed cold water supply Provision should always be made for expansion 21 3 FOR THE USER 3 1 Commissioning Warning Installing and commissioning of this water heater should only be carried out by a qualified competent heating engineer Filling the water heater 1 Close the drain tap 2 Open the cold water tap to the water heater and open all taps where hot water can be drained for de aeration The water heater is filled as soon as cold water flows from all taps 3 Close all hot water drain taps Putting into operation 1 Check whether the device has been filled with water and whether the gas supply to the water heater is open 2 Turn the temperature control knob clockwise and place the control knob inthe PILOT position 3 Remove the outer door of the combustion chamber 4 Keep the control button pushed in and press the piezo ignitor several times until the pilot burns see drawing 6 5 Keep the control button 3k pushed in for approximately 20 seconds After releasing the button the pilot should remain burning If the pilot extinguishes you should wait 5 minutes before repeating the ignition procedure
15. et Hot wayer outlets Return circulation loop 9 A B C D m 2 1 3 Gas connection The gas supply to this appliance must be installed in accordance with BS 6891 1988 Fit the 1 2 gas supply cock supplied with this unit immediately before the gas control block No heat or soldered joints should be applied in the vicinity of the gas control block as they could cause damage to the control 13 All connections and joints should be tested for gas soundness with a suitable leak detector do not use a naked flame 2 1 4 Flue system The water heater should be fitted with a flue system connected to the draught diverter The flue pipe should rise for at least 50 cm vertically before the inclusion of any bends If a horizon tal run of flue is required this should be kept to the minimum length possible and incorporate a rise of 6 cm per metre of run A split clip or flange should be provided in the flue close to the draught diverter for ease of servicing All flue materials should be corrosion resistant i e stainless steel or galvanised and must include a tested and approved terminal to BS 5440 part I If the flue passes through any combustible material measures must be taken to protect against the possibility of fire All flues must terminate in free air space approx 1 5 metres from any vertical surface of structure i e chimney stacks roof parapets etc If an existing chimney or flue is to be used this s
16. higher water temperatures lead to more deposit in the appliance A temperature setting of 60 C is recommended in order to keep the calcification at a low level Decalcification should be attempted with the proper means For extensive information a decalcification instruction is available 2 84 Spare parts To be able to order spare parts it is important to note the type of appliance as well as the serial number of the appliance Based on this information the data concerning the spare parts can be determined AOS 0488 20 2 9 Inletcombination Not applicable in U K and Ireland 2 10 Faultfinding In case of failure the following should be checked Safety thermostat All appliances have been fitted with a safety thermostat that shuts off the gas supply when the water temperature is too high The safety thermostat remains activated until the water temperature drops below the safety temperature The water heater must be reignited manually The regulation thermostat should be set to a lower water temperature If the pilot is extinguished repeatedly at higher temperatures than normal this indicates that the safety thermostat is operating Drawing 11 Mounting burner set Flue down draught safety device If the flue tube safety device has switched off the appliance the appliance can be put back into operation through the normal procedure If the flue tube safety device repeatedly puts the appliance out of operation then
17. hould be swept clean and be free of debris before an approved liner is installed and connected to the water heater 2 1 5 Draught diverter The draught diverted is fitted with a temperature sensor to signal the blowback of flue gases Important The T R S should never be put out of operation The reentry of flue gasses may cause poisoning 14 2 2 Commissioning Filling the water heater 1 2 3 Close the drain tap Open the cold water tap to the water heater and open all taps where hot water can be drained for de aeration The water heater is filled as soon as cold water flows from all taps Close all hot water taps Putting into operation 1 Check whether the water heater has been filled with water and whether the gas supply to the water heater is open Turn the temperature control knob clockwise and place the control knob in the PILOT position X Remove the outer door of the combustion chamber Keep the control knob pushed in and press the piezo ignitor several times until the pilot burns see drawing 6 Keep the control button 4k pushed in for approximately 20 seconds After releasing the button the pilot should remain burning If the pilot extinguishes you should wait 5 minutes before repeating the ignition procedure The size of the pilot flame can be adjusted see also Pilot adjustment Fit the outer door Turn the control button to the ON
18. o be defective in material or workmanship the warrantor will exchange such part or component 4 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 4 3 Conditionsfor installation and use The guarantee applies to the 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 24 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
19. ped pressurised systems In each 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 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 aq p lt D lt D DSBS 2 6 2 5 AOS 0581 Gas cock Stop valve Expansion vessel T amp P safety valve Non return valve Circulation pump Drain valve N2 Ranz the current building regulations should be used Installation should be carried out generally as shown on the following diagram See drawing 4 A O Smith water heaters are tested to a maximum pressure of 12 bar and a maximum working pressure of 8 bar Drawing 4 Connection diagram unvented system 8 Pressure limiting valve Pressure relief valve Gas supply Hot water outlet Cold water inl
20. rne nnne nenne 14 2 1 5 Flue down draught safety device 14 2 2 Commissioning es 15 2 3 Pilotadjustment 16 2 4 Putting out of operation 16 2 5 Temperature regulation 16 2 6 Setting the nominal heat input m17 2 7 Conversion procedure 17 2 8 Maintenance 2 8 1 Sacrificial anode TE 2 8 2 Cleaning nene edat t de de Pere e dd ide ic ez 2 8 3 Decalcification rrr nr Apa 2 8 4 Spare parts xA 2 9 Inletcombination LA S 2 10 2 Faultfinding doct Ete ee o e ee eed does 2 11 Gas smell 2 12 Condensation 2 18 Important warning 3 Fortheuser 22 3 1 Commissioning 22 CHANEL 22 9 3 Putting out of operation rnt cete terne ee 22 3 4 Faultfirding osuere eee eere a 23 4 Guarantee aNG Bm teet die e Pdl etri 24 1 GENERAL exceeding 25 mm maximum dead leg 3 0 metres 1 1 Description of the appliance Construction of the water heater is in accordance with the European standard for gas heated water storage heaters for sanitary application EN 89 The appliance thus meets the European Directory for Gas Appliances and is therefore entitled to carry the CE marking It is an open flued appliance without ventilator and with a flue gas do
21. rned to the e position the pilot is extinguished 3 Close the gas tap in the supply pipe In case of longer interruptions or in the event of risk of frost it is recommended to also close the cold water tap and to drain the appliance after cooling open the drain tap it is possible to connect a drain hose to the drain tap open the nearest hot water drain point to prevent airlocks To be able to drain the appliance completely it should be disconnected and tilted slightly in the direction of the drain tap 3 4 Failure Gas smell Pilotextinguishes Insufficientorno hotwater Waterleakage Fault finding Blocked pilot burner Measure Ifyou smell gas you should immediately close the main gas tap you should notlight any fire or switch on light electrical switches or bells Open windows and immediately contact your installer or the local gas company Clean the pilotburner Blocked chimney Find the cause and remove it Safety thermostat Thermocouple defective Setthe temperature regulator ata lower temperature Replace the thermocouple Thermocouple makes no contact Restore the connection Gas supply closed Temperature is set too low Openthe gastap Set the temperature regulator at a higher temperature Control knob in position pilot burns Turnthetemperature regulator completely clockwise turn control button to on 6 turnthe temperature regulator to the desired
22. st hot water tap in order to allow the pressure to drop from the water heater and the pipes 3 Slacken the anode with a fitting wrench 4 Check the anode and replace it if it has been reduced in diameter by 6096 or more at any point on its length 5 Check for water leaks If it is necessary to replace the AOS 0487 Drawing 10 Conversion to another gas anode it should always be replaced by one of the same type The type of anode required can be determined on the basis of the type of the appliance and the serial number 2 8 2 Cleaning 1 2 Close the gas supply and demount the burner after it has cooled down Disconnect the burner pilot pipe and thermo couple from the gas control block see drawing 11 Remove the complete burner assembly Clean the burner with a soft brush Check the pilot burner and clean it if So required Check the combustion chamber flue tube and flue baffle and clean these if required Re mount in reverse order Tighten the thermo couple connection on the gas control block hand tight and tighten it further with a wrench to a maximum of 1 4 turn as it only needs to make contact After cleaning of the pilot and main burner the operation of these should be checked If necessary the burner pressure of the main burner should be reset 19 2 8 3 Decalcification Formation of lime scale depends on the quality and quantity of the water used In addition
23. this points to problems with the flue The only remedy is to determine the cause of the problem for instance a blocked chimney and to solve the problem Hot water temperature too low 1 Check the setting of the temperature control knob 2 Check whether the pilot is alight If necessary ignite see Putting into operation 3 Check whether there are any leaks or open taps 4 15 the gas supply adequate Check and correct if necessary 5 Perhaps the hot water consumption is higher than was originally calculated 6 Check whether the cold water inlet has been correctly connected 7 Check the thermostat sensor for scale build up Hot water temperature too high Check whether the control thermostat is set too high Possible water leakage 1 Check whether the drain tap is fully closed 2 Check whether all water connections are water tight 3 Check whether the possible water leakage could be caused by condensation 2 11 Gas smell Warning Immediately shut the main gas tap Do not light any fire or switch on any lights do not use any electrical switches or alarm bells Open windows Thoroughly inspect all gas connections and if the gas smell persists alert the local gas company and or your installer 2 12 Condensation If the appliance is filled with cold water or if the hot water consumption is very high condensation of flue gasses will occur on the cold surfaces of the combustion chamber and th
24. tion The appliance is under water supply pressure maximum 8 bar The amount of cold water that is added is equal to the amount of hot water used The gas control block automatically regulates the gas supply The main burner will ignite as soon as a reduction in water temperature is sensed by the thermostat The main burner will shut down as soon as the preset temperature is achieved Position 1 approximately 30 C Position 2 approximately 40 C Position 3 approximately 50 C Position 4 approximately 60 C Position 5 approximately 70 C At high water temperatures there is more scale buildup in the appliance It is for this reason that it is recommended to place the temperature control knob in position 4 as the accumulation of scale will be reduced In addition a safety thermostat has been fitted This thermostat completely shuts off the gas supply if the water temperature reaches 82 C also extinguishing the pilot burner AOS 0485 16 Drawing 8 Setting the pilot 2 6 Setting the nominal heat input The gas control has been factory preset to the water heater nominal heat input A further check of the burner pressure should be carried out during the commissioning of the unit after installation The following procedure should be followed 1 Remove the protruding cover screw on the right side of the gas control block and connect a U gauge manometer to the outlet 2 Put the appliance into operation and
25. wn draught safeguard category B11BS The water heater is suitable for a maximum working pressure of 8 bar The water heater tank is manufactured from low carbon sheet steel and is glass lined on the inside In addition the tank is fitted with a sacrificial anode as an extra protection against corrosion A thick PU insulation layer covered in a steel jacket reduces unnecessary heat loss When the appliance is filled with water it continuously is under water pressure As hot water is drained from the tank cold water is added immediately Four flue baffles has been placed in the flue tube to improve heat transfer The flue gasses pass their heat on to the water by means of radiation and convection The flue gasses are guided to the chimney via the draught diverter The exhaust of the flue gasses is realized by natural thermal draught see drawing 1 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 JOU RONS NER 2 ra 7 UN KA 4 f 9 Pa x 8 4 2 9 3 7 WA 2 sH 2 10 4 7
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