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1. 6720645222 02 1Wo Fig 3 Hot water return pipe fitting WORCESTER 6 720 645 222a 2012 05 7 Bosch Group BOILER CONNECTIONS 3 2 GAS AND WATER CONNECTIONS CAUTION N ISOLATE THE MAINS GAS SUPPLY BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS Removetemplate and secure the wall mounting frame to the wall with the fittings supplied System pipes may be run vertically upwards behind the boiler or below it See Plumbing Manifold Section on page 6 1 CH and cylinder flow 22mm 2 Gas inlet 22mm 3 Cylinder return 15mm 4 CH return 22mm If using the optional filling loop 7 716 192 281 not supplied with the boiler fit it before hanging the boiler on the wall frame The bonded washer supplied is for the Gas il connection only Fit sealing washers to service valves before hanging boiler 6720645222 04 1Wo Fig 4 Sealing washers NOTICE Before hanging the boiler onto the N wall mounting frame ensure that the pressure relief valve connection is in the DOWN position This is located on the right hand side of the wall frame at the rear 1 Pull the extended tab lever forward and down until there is no furt2. 5 3 POSITION OF WIRED COMPONENTS FLAME SENSE ELECTRODE T Fan wiring SPARK STAT Live purple ELECTRODES Neutral brown FLOW TEMP SENSOR NTC FAN Colour sequence t FLUE OVERHEAT STAT SAFETY SOLENOID I SAFETY L SOLENOID DIET 00 vylyr DIVERTER PUMP VALVE MAINS SUPPLY Wall plate contacts for FX controls B B 7 PUMP l SUPPLY EXTERNAL 230V FROST STAT EXTERNAL r OPTIONAL ROOM STAT WHEN USED pies ij WITH DT20 el IW Colour sequence t 33 CH TEMPERATURE 27 DHWTEMPERATURE CONTROL MAL CONTROL CYLINDER Fuse F1 slow 2 5 A AC 230 V TRANSFORMER Roo EMS BUS contacts for FX controls WORCESTER 24V CONTROLS PLUG IN POINT 9999 OPTIONS DT20 OR DT20 RF OR DT10 RF ST9 Ke pi under blanking cover on fascia Fuse F3 slow T 0 5A siz al Red Fuse F2 slow T1 6 A Red 1 4 ss QI sns DIAGNOSTIC sr HI interrace CODE PLUG Cylinder temperature sensor PRE WIRED LINK 6720645222 22 1Wo Fig 20 Wired components 14 6 720 645 222a 2012 05 WORCESTER Bosch Group PRE COMMISSIONING CHECKS 6 PRE COMMISSIONING CHECKS NOTICE If the boiler is not to be N commissioned immediately then after successfully com
3. Connect the gas supply to the boiler gas cock 22mm compression To connect the expansion vessel flexible pipe to the hydraulic manifold situated to the left of the pump Remove and discard the plastic cap from the expansion vessel flexible pipe 1 Refer to figure 8 release the retaining clip 2 Remove and discard the orange plastic blanking plug 2 from the pressure vessel connection at the hydraulic manifold 6720645222 06 1Wo Fig 9 Expansion vessel connection Connect the pressure relief drain pipe to 15mm compression joint using the compression nut and olive supplied in the literature hardware pack WORCESTER 6 720 645 222a 2012 05 Bosch Group FITTING THE DIVERTER VALVE AND CODE PLUG 4 FITTING THE DIVERTER VALVE AND CODE PLUG 4 1 FITTING THE DIVERTER VALVE 4 2 ACCESS TO THE CODE PLUG MOTOR 1 Referring to figure 12 unscrew the three screws in 1 Remove the diverter blanking plate by pulling it the control panel forwards to free it from its location 2 Pull off the connections cover 1 6720643895 40 1Wo JU Fig 12 Removing the connection cover Fig 10 Removing Diverter valve blanking plate gt Identify ST18 the code plug and connector 1 To fit the diverter valve motor push the motor into the e housing until the motor clicks securely into place ensuring that the actuator arm locates into the middle of the H receptor on the motor
4. LO o CN d o N bd CN CN CN wo st ce o N N c INSTALLATION INSTRUCTIONS WALL HUNG RSF GAS FIRED CONDENSING BOILER GREENSTAR i SYSTEM OPTIONAL INTEGRAL DIVERTER VALVE FOR CENTRAL HEATING SYSTEMS AND INDIRECT FED DOMESTIC HOT WATER Diverter valve kit numbers 12kW 7 716 192 566 15kW 7716192567 18kW 7 716192 568 24kW 7716 192 409 Diverter valve kits contain Copper return pipe Brass service valve 15mm Compression nut 15mm Olive Diverter valve motor Diverter valve harness Screws Y gt Code plugs r n n r Hr re Ir r ta Code plug tie Code plug numbers 12i System Natural gas 1118 L P G 1119 15i System Natural gas 1122 L P G 1123 18i System Natural gas 1126 O 2 L P G 1127 D 5 24i System Natural gas 1114 S QY L P G 1115 DEN CHING 8 THE MARK OF QUALITY FOR THE INSTALLATION COMMISSIONING AND SERVICING OF DOMESTIC HEATING AND HOT WATER SYSTEMS WORCESTER Bosch Group CONTENTS 1 KEYTO SYMBOL AND SAFETY PRECAUTIONS 3 1 1 Explanation of symbols 3 1 2 Safetyprecautions 4 2 PLUMBING MANIFOLD lee 6 3 BOILER CONNECTIONS 7 3 1 Assembly of the internal cylinder return pipe to the boiler llus 7 3 2 Gas and water connections 8 4 fITTING THE DIVERTER
5. E N 5 Ik Gg On A SS D el h D ST17 j H A 1 ee S ig 6720645222 11 1Wo Fig 16 Diverter motor and sensor connections Replace the control panel cover Move the control panel to the up position and secure WORCESTER 6 720 645 222a 2012 05 Bosch Group 11 ELECTRICAL b ELECTRICAL NOTICE N Mains supply to the boiler must be through a fused double pole isolator situated adjacent to the appliance The isolator must have a contact separation of 3mm minimum in both poles External fuse rating 3A When stripping wires always ensure copper strands do not fall into the control box There should be no external wiring centre Afascia mounted twin channel programmer must be used Timers available DT20 Twin Channel Programmer 7 716 192 038 DT10RF Digistat 7 716 192 052 DT2ORF Digistat 7 716 192 054 5 1 INTERNAL DIVERTER VALVE WITH A VENTED CYLINDER ACCESS TO ELECTRICAL CONNECTIONS Remove boiler casing to access control panel Room Thermostat 1 Unscrew the single screw and lower the control box into the horizontal position 230V 2 Unscrew the three screws in the control panel and MAINS pull off the connections cover DT20 Twin Channel SUPPLY Programmer 3 230V room thermostat with timer 7 716 192 038 NEL ST10 Switched live green yellow Remove link Leite RSEBAA Connect room stat LIVE supply
6. 2 Connect the plug of the diverter valve motor harness into the socket on the diverter valve motor 3 Slide the protective cover over the diverter valve motor 6720645222 09 1Wo Fig 13 Connector locations L NOTICE RESET THE CONTROL BOARD N Following changes to the wiring of ST15 and J ST8 the control board will need to be reset v to recognise the new connection To reset the control board Hold the Service mode Spanner and the Eco buttons down for at least five 6720645222 08 1Wo seconds Fig 11 Fitting Diverter motor and cover 10 6 720 645 222a 2012 05 WORCESTER Bosch Group FITTING THE DIVERTER VALVE AND CODE PLUG 4 3 FITTING THE CODE PLUG Boiler size Gas Code plug no 12kW i System kit NG 1118 LPG 1119 15kW i System kit NG 1122 LPG 1123 18kW i System kit NG 1126 LPG 11327 24kW i System kit NG 1114 LPG 1115 1 Refer to figure 14 Remove the code plug from the controller cut the tie securing the plug to the boiler chassis and discard the plug and tie 2 Fit the code plug from the kit making sure that code plug is secured to the boiler chassis with the new tie Confirm that the number on the code plug corresponds to the boiler type in the table above e EN ST18 LV Fig 14 Fitting new code plug 4 4 FITTING THE CYLINDER TEMPERATURE SENSOR Refer to the cylinder installation instructions for the posi
7. INFORMATION Notes contain important information in H cases where there is no risk of personal injury or material losses and are identified by the symbol shown on the left They are bordered by horizontal lines above and below the text ADDITIONAL SYMBOLS Symbol Meaning gt a step in an action sequence gt a reference to a related part in the document or to other related documents a list entry a list entry second level Tab 1 Symbols SYMBOLS USED IN THIS MANUAL Domestic Hot Water Central Heating Hot Water Storage Cylinder Domestic Cold Water Supply Electrical Supply Gas Supply e Se rg Tab 2 Commonly used symbols PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE STARTING INSTALLATION THESE INSTRUCTIONS ARE APPLICABLE TO THE WORCESTER APPLIANCE MODEL S STATED ON THE FRONT COVER OF THIS MANUAL ONLY AND MUST NOT BE USED WITH ANY OTHER MAKE OR MODEL OF APPLIANCE THE INSTRUCTIONS APPLY IN THE UK ONLY AND MUST BE FOLLOWED EXCEPT FOR ANY STATUTORY OBLIGATION THIS APPLIANCE MUST BE INSTALLED BY A GAS SAFE REGISTERED COMPETENT PERSON FAILURE TO INSTALL CORRECTLY COULD LEAD TO PROSECUTION IF YOU ARE IN ANY DOUBT CONTACT THE WORCESTER TECHNICAL HELPLINE DISTANCE LEARNING AND TRAINING COURSES ARE AVAILABLE FROM WORCESTER PLEASE LEAVE THESE INSTRUCTIONS WITH THE COMPLETED BENCHMARK CHECKLIST OR A CERTIFICATE CONFIRMING COMPLIANCE WITH
8. VALVE amp CODE PLUG 10 4 1 Fitting the diverter valve motor 10 4 2 Access to the code plug 10 4 3 Fitting the code plug 11 4 4 Fitting the cylinder temperature sensor 11 4 5 Diverter valve and sensor connections 11 5b ELECTRICAL c rrr mn 12 5 1 Internal diverter valve with a vented cylinder 12 5 2 Internal diverter valve with an unvented cylinder A CC ew eI Reg 13 5 3 Position of wired components 14 6 PRE COMMISSIONING CHECKS 15 7 BOILER FUNCTION eene 16 74 Fault finding ooo RR SS 16 7 2 Boilerfunction llle 17 7 3 Protection function 18 6 720 645 222a 2012 05 WORCESTER Bosch Group KEY TO SYMBOLS AND SAFETY PRECAUTIONS 1 KEY TO SYMBOLS AND SAFETY PRECAUTIONS 1 1 EXPLANATION OF SYMBOLS WARNING SYMBOLS Safety instructions in this document are N framed and identified by a warning triangle which is printed on a grey background Electrical hazards are identified by a N lightning symbol surrounded by a warning triangle Signal words indicate the seriousness of the hazard in terms of the consequences of not following the safety instructions NOTICE indicates possible damage to property or equipment but where there is no risk of injury CAUTION indicates possible injury WARNING indicates possible severe injury DANGER indicates possible risk to life IMPORTANT
9. to terminal Ls Cylinder Connect room stat LIVE return to terminal Lg temperature Connect room stat NEUTRAL to terminal Ns vv v yv OSO SOY NOTICE I ST10 6720645222 17 1Wo N gt If the timer 7 716 192 052 or 7 716 192 054 is used the room thermostat is incorporated in the transmitter Therefore keep link fitted across Ls Lg 4 Hot water channel 5 Optional external frost stat connection ST6 Connect frost stat wires to terminal Fs and Fg 6 Diverter valve motor ST17 Connect electrical harness from diverter valve motor to ST17 see following page 12 6 720 645 222a 2012 05 WORCESTER Bosch Group ELECTRICAL 5 2 INTERNAL DIVERTER VALVE WITH AN UNVENTED CYLINDER Twin Channel Cylinder Programmer temperature e sensor p DUAL THERMOSTAT HIGH LIMIT HOT WATER CONTROL THERMAL CUT OUT THERMOSTAT 230v L MAINS E SUPPLY N green yellow Room Thermostat neutral E SSO SOY LRLSNs NL 6720645222 20 1Wo OPTIONAL EXTERNAL FROST STAT CONNECTION ST6 Frost Thermostat ST6 6720643895 43 1Wo Fig 18 Frost Thermostat Connect frost thermostat cables to terminals Fs amp Fr These are not polarity sensitive CONNECTOR LOCATIONS 6720645222 09 1Wo WORCESTER 6 720 645 222a 2012 05 i8 Bosch Group ELECTRICAL
10. 3 lejop oes pouad Ire p ees aNvi3a uonesiiqeis 3oNano3s puooas OT NOILIN I SE anjen Jes anoge 9 9 SI N iii a unJJaA0 Ue 440 an en sey uni Jang duund ajnuiw eJadwa Jayem JI uMop jnus aINyeJOd Wd J9AQ NO qouy jou02 HO QNV NO peny JI 1eujureJ8 04d pejunoui elise QNV OTLS ye penu Ul 40 NO Jawweisold sulew Jo pue yeJsouuayl wooy NO IHONM anid NO AlddNS 43MOd SNIVIA Fig 21 Boiler function 17 WORCESTER 6 720 645 222a 2012 05 Bosch Group BOILER FUNCTION 7 3 PROTECTION FUNCTION AUTOMATIC INTERNAL FROST FUNCTION Internal boiler temperature between 8 C amp 5 C Internal boiler Pump switches off Pump runs temperature after a 3 minute rises above 9 C overrun period Boiler automatic frost function monitors internal boiler primary temperature Internal boiler Internal boiler Central heating temperature Central heating temperature demand switches below 5 C demand is activateg rises above 12 C off Pump switches off after a 3 minute overrun period PUMP OVERRUN FUNCTION End of boiler demand Pump runs for 3 minutes central heating or to dissipate heat from domestic hot water the boiler into the system PUMP ANTISEIZE FUNCTION No central heating Pump runs 5 seconds A central heating demand demand after every 24hrs from activated pump runs a 24hr period last time pump ran normally 6720643895 111 1Wo Fi
11. D HOT WATER SYSTEMS Benchmark places responsibilities on both manufacturers and installers The purpose is to ensure that customers are provided with the correct equipment for their needs that it is installed commissioned and serviced in accordance with the manufacturer s instructions by competent persons and that it meets the requirements of the appropriate Building Regulations The Benchmark Checklist can be used to demonstrate compliance with Building Regulations and should be provided to the customer for future reference Installers are required to carry out installation commissioning and servicing work in accordance with the Benchmark Code of Practice which is available from the Heating and Hotwater Industry Council who manage and promote the scheme Visit centralheating co uk for more information HEALTH AND SAFETY The appliance contains no asbestos and no substances have been used in the construction process that contravene the COSHH Regulations Control of Substances Hazardous to Health Regulations 1988 COMBUSTION AND CORROSIVE MATERIALS Do not store or use any combustible materials paper thinners paints etc inside or within the vicinity of the appliance Chemically aggressive substances can corrode the appliance and invalidate any warranty FITTING AND MODIFICATIONS Fitting the appliance and any controls to the appliance may only be carried out by a competent engineer in accordance with the current Gas Sa
12. IS 813 EIRE ONLY AND THE USER MANUAL WITH THE OWNER OR AT THE GAS METER AFTER INSTALLATION OR SERVICING THE BENCHMARK CHECKLIST CAN BE FOUND IN THE BACK PAGES OF THE INSTALLATION MANUAL ABBREVIATIONS USED IN THIS MANUAL Diameter NG Natural Gas LPG Liquid Petroleum Gas CH Central Heating DHW Domestic Hot Water PRV Pressure Relief Valve NTC Negative Temperature Coefficient sensor IP Ingress Protection RCD Residual Current Device TRV Thermostatic Radiator Valve WRAS Water Regulations Advisory Scheme SEDBUK Seasonal Efficiency of Domestic Boilers in the United Kingdom Tab 3 Abbreviations WORCESTER 6 720 645 222a 2012 05 Bosch Group KEY TO SYMBOLS AND SAFETY PRECAUTIONS 1 2 SAFETY PRECAUTIONS IF YOU SMELL GAS CALL NATIONAL GAS EMERGENCY SERVICE ON 0800 111 999 LPG BOILERS CALL THE SUPPLIER S NUMBER ON THE SIDE OF THE LPG TANK TURN OFF THE ECV EMERGENCY CONTROL VALVE AT THE METER gt DO NOT TURN ELECTRICAL SWITCHES ON OR OFF DO NOT STRIKE MATCHES OR SMOKE PUT OUT NAKED FLAMES OPEN DOORS AND WINDOWS KEEP PEOPLE AWAY FROM THE AFFECTED AREA BOILER OPERATION This boiler must only be operated by a responsible adult who has been instructed in understands and is aware of the boiler s operating conditions and effects penchmar THE MARK OF QUALITY FOR THE INSTALLATION COMMISSIONING AND SERVICING OF DOMESTIC HEATING AN
13. cylinder stat wiring from 7 and 9 on the terminal block ST8 Fit link across 7 and 9 If the HW now functions there is likely to be a problem with the cylinder stat or wiring to the stat FOR ALL BOILERS WITH INTERNAL OR EXTERNAL CONTROLS Burner lights then goes out in DHW or CH mode Does the boiler run normally with the front cover off and then fail when the cover is put back on If yes there is likely to be a flue problem either the air inlet is blocked or the inner flue is leaking flue gases into the air inlet BOILER NOISY OR GOING TO OVERHEAT 1 Was the system flushed 2 Has the pump been bled and the dust cap released GENERAL CHECKS 1 Is all the air bled from the gas supply 2 Is all the air bled from the primary water system 3 Is there 230v ac across the boiler live and neutral terminals L amp N on ST10 4 Is the polarity correct 5 Is the incoming gas pressure at least 18mbar with the boiler at maximum output 16 6 720 645 222a 2012 05 WORCESTER Bosch Group BOILER FUNCTION BOILER FUNCTION 7 2 OML S2 2725790219 SPU0I9S QT YEM erg pue 1nO3201 xX1eds dois SPU099S og uni ugy sejnului g uni dung 440 SAA spuooes y se3 pue ZU uaNung uous y eds OAJEA Seo jdn uonisod ep JONANDAS NOILINDI Mop vonisod Ho aAleA J919AIQ MO dung 9078 07 s nyessdws yas ana yde oj uolyejnpow ue4 GNVW3AG 431108 JO QN
14. e Relief Valve 367 mm 15 mm 6 Cylinder return 267 mm 15mm Tab A Key to figures 1 amp 2 6 720 645 222a 2012 05 WORCESTER Bosch Group BOILER CONNECTIONS 3 BOILER CONNECTIONS CAUTION CYLINDER RETURN PIPE N gt The following must be completed before the boiler is mounted onto the wall mounting frame 3 1 ASSEMBLY OF THE INTERNAL CYLINDER RETURN PIPE TO THE BOILER Use the packaging as protection turn the boiler on its left hand side to enable fitting of the hot water return pipe Move the control panel into the service position by removing the screw from the retaining bracket 1 Loosen the two retaining screws to free the back clamping plate on the hydraulic block as shown in figure 3 2 Remove the brass bung assembly from the hydraulic block by removing the screw and sliding it free from the flange on the clamping plate Make sure that the other brass bung assembly is retained in place 3 Remove the copper pipe from the Optional Integral Diverter Valve Kit and feed the flat end of the pipe through the rear of the boiler as shown 4 Before fitting the pipe check that the seal is in position on the plastic moulding Slide the flat end of the pipe under the flange on the hydraulic block clamping plate ensuring that pipe is located correctly 5 Secure the clamping plate by re tightening the two screws 1 loosened in step 1
15. fety Installation and Use Regulations Flue systems must not be modified in any way other than as described in the fitting instructions Any misuse or unauthorised modifications to the appliance flue or associated components and systems could invalidate the warranty The manufacturer accepts no liability arising from any such actions excluding statutory rights SERVICING Advise the user to have the system serviced annually by a competent qualified Gas Safe registered engineer Approved spares must be used to help maintain the economy safety and reliability of the appliance IMPORTANT The service engineer must complete the Service Record on the Benchmark Checklist after each service INSTALLATION REGULATIONS Current Gas Safety Installation amp Use Regulations All gas appliances must be installed by a competent person in accordance with the above regulations Failure to install appliances correctly could lead to prosecution The appliance must be installed in accordance with and comply to the current Gas Safety Regulations IEE Regulations Building Regulations Building Standards Scotland Consolidation Building Regulations Northern Ireland local water by laws Health amp Safety Document 635 The Electricity at Work Regulations 1989 and any other local requirements WORCESTER Bosch Group 6 720 645 222a 2012 05 KEY TO SYMBOLS AND SAFETY PRECAUTIONS British Standards Where no specif
16. ftened water must not be used to fill the central heating system WORCESTER 6 720 645 222a 2012 05 Bosch Group PLUMBING MANIFOLD 2 PLUMBING MANIFOLD CONNECTIONS Heating System 22mm compression fittings Gas 22mm compression fitting Cylinder Return 15mm compression fitting Use the fittings supplied in the Hardware literature pack and the Optional Diverter Valve Kit NOTICE Fitting the service valve N Referto figure 2 The service valve 7 from the Optional Diverter Valve Kit must be fitted and secured to the wall mounting frame with two screws 8 supplied before the wall mounting frame is fitted to the wall If the boiler pipes are to be run behind the appliance ensure that the pipes pass through the slot in the guide 9 This is fitted to the boiler frame Further guidance on pipe routing can be il found printed on the boiler template supplied with the boiler NORCESTER 6720645222 12 1Wo Fig 1 Pipe dimensions t TL 6720644222 01 1Wo 3 6 Fig 2 Plumbing manifold with wall frame M NE From left Diameter Function case edge of pipe 1 CH and cylinder flow 70 mm 22 mm 2 Gas 200 mm 22 mm 3 CH Return 330 mm 22 mm 4 Condensate 35 mm 22 mm 5 Pressur
17. g 22 Protection function 18 6 720 645 222a 2012 05 WORCESTER Bosch Group BOILER FUNCTION NOTES WORCESTER 6 720 645 222a 2012 05 m Bosch Group Worcester Bosch Group Cotswold Way Warndon Worcester WRA 9SW Tel 0844 892 9900 Worcester Bosch Group is a brand name of Bosch Thermotechnology Ltd worcester bosch co uk 6 720 645 222a 2012 05 WORCESTER BOSCH GROUP TECHNICAL SUPPORT 0844 892 3366 APPOINTMENTS 0844 892 3000 SPARES 01905 752571 LITERATURE 0844 892 9800 TRAINING 01905 752526 SALES 01905 752640 WORCESTER Bosch Group
18. her travel 6720643895 116 1Wo Fig 5 PRV connection in the down position CAUTION Caps or plastic strip fitted to N pipes must be removed before hanging the boiler Hangthe boiler on to the wall mounting frame by the two brackets positioned left and right at the top rear of the appliance Do not lift the appliance by the air gas manifold There are two handling holes incorporated into the inner casing left and right in the lower section of the appliance 6720643895 22 1Wo Fig 6 Hanging the boiler NOTICE The pressure relief connector N must be repositioned after the boiler has been correctly mounted to the wall mounting frame WORCESTER Bosch Group 6 720 645 222a 2012 05 BOILER CONNECTIONS 1 Push the lever on the pressure relief connector UP until the stop on the inside of the handle is over the shoulder of the metal bracket to secure in place v O KOSCH d 6720645222 05 1Wo Fig 8 Blanking plug removal 1 Refer to figure 9 and insert the expansion vessel flexible pipe it to the fitting on the pump 2 Secure in place with the wire retaining clip 6720644743 17 1Wo Fig 7 PRV in the up position Remove the screw from the control panel retaining bracket and lower the control panel into the service position Make connections to the heating system and cylinder
19. ic instruction is given reference should be made to the relevant British Standard codes of Practice BS7074 1 Code of practice for domestic and hot water supply BS6891 Installation of low pressure gas pipe work up to 28mm R1 BS5546 Installation of gas hot water supplies for domestic purposes EN12828 Central heating for domestic premises BS5440 1 Flues and ventilation for gas appliances of rated heating not exceeding 7OkW net Flues BS5440 2 Flues and ventilation for gas appliances of rated heating not exceeding 70kW net Air Supply BS7593 Treatment of water in domestic hot water central heating systems BS6798 Installation of gas fired boilers of rated input up to 70kW net Irish Standards The relevant Irish standards should be followed including ECTI National rules for electrical installations e IS 813 2002 for Domestic Gas Installations LPG Installations An appliance using L P G must not be installed in a room or internal space below ground level unless one side of the building is open to the ground Timber framed building Where the boiler is to be fitted to a timber framed building the guidelines laid down in BS5440 Part 1 and IGE Gas Installations in Timber Frame Buildings should be adhered to Potable water All seals joints and compounds including flux and solder and components used as part of the secondary domestic water system must be approved by WRAS CH Water Artificially so
20. pleting all of the checks and any rectification work close the gas and water valves shut off the gas supply electrically isolate the boiler and label appropriately 1 Check that the service and water pipes are connected to the correct position on the manifold A Flow 22mm B CH Return 22mm C Gas inlet 22mm D Cylinder Return 15mm 2 Check the gas type specified on the identification plate matches that of the gas supply Turn on the main gas supply check the gas pipework connections and rectify any leaks 3 Check that the condensate pipe has been connected to the syphon 4 Check pressure relief drain pipe is correctly fitted and securely tightened NOTICE N NOW RETURN TO THE SYSTEM INSTRUCTION MANUAL FILLING THE SYSTEM TO CONTINUE INSTALLATION WORCESTER 6 720 645 222a 2012 05 Bosch Group 15 BOILER FUNCTION 7 BOILER FUNCTION 7 1 FAULT FINDING If in the unlikely event the boiler does not give complete satisfaction before calling for a service engineer the installer should check the following FOR BOILERS WITH INTEGRAL DIVERTER VALVE AND CONTROLS NO CENTRAL HEATING BUT HOT WATER OK Remove the room stat wiring from Ls LR and N from terminal block ST10 Fit a link between Ls and LR if the CH now works there is likely to be a problem with the room stat or wiring to it NO HOT WATER BUT CENTRAL HEATING OK If a cylinder stat is used remove the
21. tion of the sensor there may already be a sensor pocket available If no pocket is available for foam insulated cylinders only with no metal jacket follow the steps below 1 Mark a rectangular hole of approximately 50 by 100mm approximately one third of the cylinder length from the bottom of the cylinder CAUTION Cut carefully N Do not to pierce the wall of cylinder Do not cut any metal insulation jacket 1 Using a sharp knife cut through the insulation remove and retain the piece of insulation 2 Apply heat conductive paste to the sensor and place the sensor on the cylinder body in the middle of the cut out 3 Hold the sensor in position with a piece of aluminium tape 4 Replace the insulation material 5 Secure the insulation in place with suitable cloth tape NOTICE Figure 15 applies only to foam N covered open vent cylinders 6720645222 24 1Wo Fig 15 Sensor connection to cylinder 4 5 DIVERTER VALVE AND SENSOR CONNECTIONS NOTICE Do not route low voltage cables alongside mains voltage cables This can cause interference on the low voltage cables 1 Connect the Diverter valve motor harness to the edge connector ST17 2 Connect the cylinder temperature sensor 1 to the edge connector ST15 If the ST15 connector and sensor is being il used do not connect ST8 as well The link is not required N
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