Bosch W11P User's Manual
Contents
1. 2180 1 6720607539 02 1AL__ Fig 4 27 Commissioning Turn on the gas and water cocks and check all connections for leaks Check flue gas safety device good functioning proceed as explained in section 3 5 6 720 607 526 3 Operation and maintenance Sealed parts must not be interfered with 31 Function This water heater is fitted with piezo ignition that provides for easy commissioning In first place it must dislocate the output control of the off position to the ignition position see fig 5 Press in the slide control knob and subsequently press the piezo button Release the slide control after about 15 seconds if the pilot flame does not stay alight repeat the operation Ignition may not be successful due to the presence of air inside the gas supply pipe especially if first connected or after long inactive periods In this case keep the output control knob fully depressed until the gas pipe has been totally purged Slide the gas control slide fully to the right to obtain maximum output Sliding the gas control slide to the left reduces the output In order to optimise energy consumption adjust the output control to supply the minimum output required After following these procedures ignition of the main burner will automatically take place whenever you turn on a hot water tap since the pilot burner is permanently alight When2. 2 Preconditions for installation sees sensunsnunnnnnnnoennunnsnnnnsnns 5 21 REQUIATIONS panenane a 5 DD LOCATION EEEE AEE EAE EEE E 5 2 3 Fixing the appliance ou cesses 5 2 4 Water CONNECTION wccecccccscscesscesscsssscsssesesseneesnsesaeses 5 2 5 Gas CONNECTION wicceccescsssscssescescseesseeessenceteeees 2 6 FUG PE EEE EEEE E EEEE E 2 7 COMISSIONINY uo tsetse teense 3 1 FUMCUON separas a 3 2 Water temperature control ose 3 3 Appliance adjustments sssrin 3 4 Maintenance ceseeseeeteeeseeteeeeeeteeeneees 3 5 Flue gas safety AeVICE ween 3 6 Converting to a different gas type 3 7 Troubleshooting uot cence 4 Ope ration secssessssssssssessseseessessessteestestesstesseeasers 1 Technical Characteristics and Dimensions 11 General Description This water heater is fitted with a piezo system Guaranteed safety provided by Gas tight ionisation detector that prevents escape of gas if there is no flame Flue gas safety device that switches off the appliance if the flue is not functioning properly Temperature limiter which protects the heat exchanger against overheating Heat exchanger has no tin lead lining Automatic water valve made of glass fibre reinforced polyamide 100 recyclable Automatic control of water flow maintains constant flow rate even with fluctuating supply pressure Gas valve with adjustable output via a slide control 1 2 Explanation of Model Code W G
3. 6 720 607 526 ZA 05 02 JS Installation and Operating Instructions BOSCH Gas Instantaneous Water Heater C0 Safety instructions If you smell gas Do not operate any electrical switches Do not telephone from inside the danger area Turn off the gas cock Open windows and ventilate room From outside call the gas company and your approved installer Do not use or store easily combustible materials in the vicinity of the appliance 6720606846 00 1JS W11 P W14 P W18 P With piezo ignition and double safety system consisting of flue gas monitor and heat exchanger temperature sensor Installation and servicing of the appliance may only be carried out by an approved technician The appliance should be regularly serviced in order to ensure that it remains in perfect and safe working order If there is a risk of freezing the appliance must be switched off and drained If the appliance has not been drained during a cold spell when it is switched on again check that it produces hot water If problems occur contact your installer page 1 Technical Characteristics and Dimensions 2 11 General description sss 1 2 Explanation of model code 1 3 ACCOSSOMES a a aar a a epi iaie tiOn a 1 4 DIMENSIONS a a a a 1 5 Appliance design ss s ssssssssesssssunsusensunonresunsennnsnnosnnornnennnssnns 1 6 Technical characteristics ccccscsssssssssssssssssssseeeeeees
4. ace with pipe about 50 cm long with sealed end Fit pipe vertically Start up appliance at rated output and set temperature control to maximum temperature Under those conditions the appliance should shut down after two minutes Remove temporary pipe and reconnect flue pipe This work may only be carried out by an approved engineer 3 6 Converting to a different gas type Use only the genuine Bosch conversion kit Conversion may only be carried out by an approved technician 6 720 607 526 37 Troubleshooting Installation servicing and repairs may only be carried out by an approved engineer The following table illustrates only a few solutions to straightforward problems ee Pilot flame stay alight Blocked pilot burner Several atempts required to turn pilot flame on Yellow pilot flame Flame goes out while appliance is in Flue gas safety device has tripped operation Temperature limiter has tripped Water not hot enough Water not hot enough weak flame Gas supply dynamic pressure too low Reduced water flow rate Inadequate inlet flow rate Dirt in water service cock or mixer unit Automatic water valve clogged Heat exchanger clogged scale Ventilate room Wait 10 minutes then restart appliance If problem recurs call an approved technician Wait 10 minutes then restart appliance If problem recurs call an approved technician Check output selector position and regulate according wit
5. as instantaneous water heater 11 Flow rate l min P Piezo ignition 23 Natural gas type H 31 LPG butane propane S Country code 1 3 Accessories Included with Appliance Sleeves and hooks for wall mounting 6 720 607 526 1 4 Dimensions l 7 4 1 Front cover 2 Hole for fixing to wall c u 3 Observation window 8 4 Temperature control Ode gs 5 Output control 6 Gas connection 7 Exhaust pipe union 8 Draught diverter with flue gas a monitor 3 9 9 Heat exchanger w 10 Automatic gas valve i 11 Piezo p J i 10 12 Water valve 1 9 11 8 6 12 6720607526 01 1JS Fig 2 c H ETP TE LE T pe re 1 2 1 5 Appliance design Heat exchanger Main burner Injector Slow ignition valve Temperature control Venturi Water valve Water throttle Water filter 10 Membrane 11 Cold water pipe 12 Magnetic valve 13 Gas supply pipe E adi a GO NO 14 Gas filter 15 Regulating screw 16 Pilot filter 17 Piezo 18 Hot water pipe 19 Output control 20 Igniter button 21 Main gas valve 22 Gas valve for pilot burner 23 Pilot burner injector 24 Gas valve 25 Jet pressure testing point 26 Thermocouple 27 Igniter electrode 28 Temperature limiter 29 Flue gas safety device 17 16 1514 13 12 qi orzo FII 3 6 720 607 526 3 1 6 Technica
6. h needs Check gas cylinder governor and replace if incompatible or damaged Check whether gas cylinder butane is freezing when appliance is in operation and re site in warmer location if necessary Check and adjust Check and clean Clean filter Clean and descale as necessary The operations marked with may only be carried out by an approved technician 6 720 607 526 4 Operation Turn on all gas and water taps Purge air from pipes Ignition Depress slide control knob and hold it in Release the slide control knob after approximately 15 seconds L ll 6720606846 01 1JS Press the piezo igniter Repeat these steps if the flame does not stay alight Output Control eG output decrease k N output increase 6720606819 06 1JS Temperature adjustment ao Turning control anti clockwise ANN Turning control clockwise increases water flow rate and J reduces water flow rate and reduces water temperature increases water temperature Z N 6720606494 06 1JS Switching off BOSCH
7. l characteristics Rated max heat output 104165 Rated min heat output i 52082 Output modulation range 31420 65570 40300 80595 52082 104165 Rated max heat input 117825 Output and heat Rated min heat input i 58912 Supply pressure Natural gas kPa LPG butane propane mbar kPa Consumption a 2 5 7 n 1 Natural gas m h specifications LPG butane propane kg h Number of injectors Max water pressure Temperature control at maximum setting Temperature increase Flow rate Min operating pressure Temperature control at minimum setting Temperature increase Water system specifications Flow rate Draught requirement Flow rate Temperature T specifications 15 C 1013 mbar dry Natural gas 34 2 MJ m 9 5 kWh m LPG Butane 45 7 MJ kg 12 7 kWh kg Propane 46 4 MJ kg 12 9 kWh kg This figure must not be exceeded taking account of water expansion At maximum rated heat output 4 6 720 607 526 2 Preconditions for installation The appliance can only be sold in the countries mentioned in the type plate 21 Regulations Any local by laws and regulations pertaining to installation and use of gas heated appliances must be observed Please refer to the laws that should be attended in South Africa 2 2 Location The appliance should be sited in a well ventilated room where it will not be exposed to temperatures below freezing To prevent corrosion the combusti
8. o drain the appliance before installing it as any dirt or grit inside it could reduce the water flow rate and in extreme cases could completely clog up the appliance Mark hot water and cold water pipes so as to prevent confusion Connect pipe to automatic water valve using the connecting kit supplied To prevent problems caused by sudden pressure fluctuations in the water supply it is advisable to fit a non return valve to the water outlet 2 5 Gas connection Take care to ensure dirt is not allowed to enter gas inlet Make sure that the type of gas specified on the appliance type plate is the same as that supplied by the gas authorities Select pipe diameter to suit output of instantaneous water heater being installed Fit gas service cock as close to appliance as possible Caution This is a low pressure gas appliance A SA certified 2 8 kPa low pressure regulator must be fitted 2 6 Flue It is absolutely essential that all instantaneous water heaters are connected to a suitably dimensioned flue pipe by means of a gas tight connection The flue pipe should be made of galvanised iron aluminium stainless steel or fibre concrete Fit as shown in Fig 4 A flexible or rigid pipe should be used fit it inside the flue socket The external diameter of the pipe should be slightly smaller than the dimension specified in the appliances dimensions table N 226 wind rain protection T
9. on air must not contain any corrosive substances Substances classed as corrosion promoting include halogenated hydrocarbons such as are found in solvents paints adhesives aerosol propellants and various household cleaners Appropriate measures should be taken where necessary With the exception of the flue pipe the surface temperature of the appliance is below 85 C No special safety measures are therefore necessary Site appliance as shown in Fig 4 Always site appliance in a location not exposed to temperatures below freezing If this is not possible the appliance must be switched off and drained whenever there is a risk of freezing Danger the appliances are designed to prevent flame reflow In case you suspect anything unusual in the appliance operation please shut down gas and water cocks and call an approved technician to check the local conditions To prevent flame reflow in outdoor installations please make sure that a wind rain protection is fitted To prevent flame reflow in indoor installations please make sure that a wind rain protection is fitted at the end of the secondary flue 2 3 Fixing the appliance Remove the temperature control and the output control Remove the outer case by sliding it forwards and then lifting upwards Fix the appliance using the sleeves and hooks supplied so that it is vertical Never allow the appliance to rest against water or gas pipes 24 Water connection It is advisable t
10. t burner and automatic water valve filter If necessary the inside of the heat exchanger and the connecting pipes should be descaled Check the gas and water valves for leaks and carry out a complete function check If components need to be replaced use only genuine Bosch spare parts 3 5 Flue gas safety device The recommition must be done from a qualified technician only The flue gas safety device must not under any circumstances be switched off simulated or replaced by any other component Operation and safety precautions The flue gas safety device checks the effectiveness of flue gas extraction by the flue If it is inadequate the appliance switches off automatically so that the combustion fumes do not escape into the room in which the appliance has been installed The flue gas safety device resets after a cooling down period If the appliance shuts down while in operation ventilate the room Wait about 10 minutes then restart the appliance If the problem recurs call an engineer The user must never make any modifications to the appliance Maintenance If faults occur on the flue gas safety device proceed as follows Undo flue gas safety device fixing screw Undo magnetic unit connector Remove thermocouple Replace damaged component with new one and refit using the reverse of the procedure set out in the table above Function check Flue gas safety device function check Disconnect flue pipe Repl
11. you want to switch off the heater move the slide control to the far left After a few seconds the pilot flame will go out If there is a risk of freezing switch off the appliance and drain the appliance Danger the area in front of the burner can reach very high temperatures and there is a risk of burning on contact 3 2 Water temperature control The water temperature control is used to adjust the water flow rate and thereby the water temperature to the desired setting Turning the control clockwise reduces the water flow rate and increases the temperature turning the control anti clockwise increases the water flow rate and reduces the temperature If the temperature is set only as high as required energy consumption is reduced and the likelihood of scale deposits in the heat exchanger minimised 3 3 Appliance adjustments All instantaneous water heaters are factory adjusted and require no further adjustment Water heaters that use LPG liquefied petroleum gas i e butane propane are set to the operating pressure stated on the identification plate 2 8 kPa Natural gas appliances are set to a Wobbe Index of 15 kWh m and a supply pressure of 2 0 kPa Sealed components must not be tampered with 3 4 Maintenance The appliance should only be serviced by an approved engineer A complete overhaul should be carried out after two years The overhaul should involve thoroughly cleaning the heat exchanger burner pilo
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