Glow worm Hideaway 40 B
Contents
1. Glowworm Instructions for Use Installation and Servicing Tobeleft withthe user 0863 Hideaway 40B G C No 41 313 16 Balanced Flue Boiler C Gencimagy Y BS 6332 BS 5258 This is a Cat L Appliance Reference in these instructions to British Standards and Statutory Regulations Requirements apply only to the United Kingdom For lreland the rules in force must be used The instructions consist of three parts User Installation and Servicing Instructions which includes the Guarantee Registration Card The instructions are an integral part of the appliance and must to comply with the current issue of the Gas Safety Installation and Use Regulations be handed to the user on completion of the installation Guarantee Registration Thank you for installing a new Glow worm appliance in your home Glow worm appliances are manufactured to the very highest standard so we are pleased to offer our customers a Comprehensive First Year Guarantee In the centre pages are to be found your Guarantee Registration Card which we recommend you complete and return as soon as possible If this card is missing you can obtain a copy or record your registration by telephoning the Heatcall Customer Service number 01773 828100 Our Guarantee gives you peace of mind plus valuable protection against breakdown by covering2. 221691B 4 Installation 4 8 Boiler Connection 240 Connect the boiler to the system pipework 9 5 in b Make the gas connection to the service cock at the lower right 7 hand side of the boiler BALANCED FLUE DUCT 2 ae FROM BOILER 14 4 in i ry PREPARED ira HOLE IN 485 3 aind THE WALL 19in MIN J VLEPPEDPEPPELEL PREPARED HOLE IN THE WALL DIMENSIONS Diagram 4 7 BOILER AIR DUCT WALL s AIR DUCT ASSEMBLY TERMINAL AND AIR DUCT STANDARD OR SHORT WIRE GUARDS INNER BAFFLE FLUE DUCT ASSEMBLY OUTER BAFFLE Diagram 4 8 5 Casing Location Fitting 5 1 Vent Grille One vent grille is supplied with the boiler which can be fitted at the rear of the left or right hand side casing The grille is fitted on the opposite side to any pipework connections Fit the grille if required to the side panel where no water pipes are connected as shown in diagram 5 1 before fixing the side panel The plastic pegs are a tight fit and are best pushed home with a flat faced tool Discard the grille if the water connections are made on both sides of the boiler or if the boiler is screened by fixtures 221691B 12 5 2 Side Casings Fit the side casings by locating their lugs into the appropriate slot in the boiler plinth see diagram 5 2 depending on the required height see Section 1 7 Secure the casin
3. Electrical Wiring 6 14 Commissioning 7 15 SERVICING Servicing 8 17 Replacement Parts 9 19 INSTRUCTIONS Fault Finding 10 21 Spare Parts 11 24 221691B 2 Instructions for Use Notes and General Information Please read these instructions and follow them carefully for the safe and economical use of your boiler The boiler is automatic in operation once the pilot has been lit and the controls set Glow worm Hideaways are central heating boilers to provide heating and if required an indirect domestic hot water supply Gas Safety Installation and Use Regulations In your own interests and that of safety itis the law that ALL gas appliances are installed by a competent person in accordance with the current issue of the above regulations Warning Make sure that nothing obstructs the rear side grille or clearances See page 6 for minimum clearances Boilers Installed in a Compartment If the boiler is fitted in a compartment cupboard etc do not obstruct the purpose built compartment vents or the grille on the boiler Do not use the compartment for storage purposes Maintenance To ensure the continued efficient and safe operation of the boiler it is recommended that it is checked and serviced as necessary at regular intervals The frequency of servicing will depend upon the particular installation conditions and usage but in general once a year should be enough It is the law that servicing must be carr
4. or 3 4 similar publication are the first checks to be carried out during a fault finding procedure On completion of the service fault finding task which has required the breaking and remaking of electrical connections then the checks earth continuity polarity and resistance to earth must be repeated Q oc ORANGE a m N FUNCTIONAL FLOW WIRING Diagram 10 2 START Carry out preliminary electrical checks to make sure that the electricity supply is available at the boiler g Check that any remote time or temperature controls are calling for duty Make sure that the system is filled o the gas supply is available and the pilot is lit Isolate electricity supply to the control box Remove the control box cover and physically check all cables and connections With electricity supply isolated remove the cover of the mains inlet connector Replace the connector without cover Restore electricity supply Is voltage between C and N blue 220 to 240V YNO Isolate electricity supply and re connect red cable i Isolate electricity supply to the control box Restore the supply Disconnect red cable at C Restore electricity supply Is voltage between red cable connector YES Yy and N blue 220 to 240V Turn boiler thermostat to MAX Is voltage between Y NO N C and N blue 220 to 240V Faulty red cable or connection isolate electricity Yy YES supply and renew cable Turn boiler thermstat to O Is voltage between N C and NO N blue zero Faul
5. 73 23 EEC on the harmonization of the Laws of the Member States relating to the electrical equipment designed for use within certain voltage limits 3 Directive 89 336 EEC on the approximation of the Laws of the Member States relating to electromagnetic compatibility INFORMATION FOR THE INSTALLER AND SERVICE ENGINEER Under Section 6 of The Health and Safety at Work Act 1974 we are required to provide information on substances hazardous to health CERAMIC FIBRE INSULATION PADS GLASSYARN These can cause irritation to skin eyes and the respiratory tract If you have a history of skin complaint you may be susceptible to irritation High dust levels are usual only if the material is broken Normal handling should not cause discomfort but follow normal good hygiene and wash your hands before eating drinking or going to the lavatory If you do suffer irritation of the eyes or severe irritation to the skin seek medical attention THERMOSTATS These contain very small amounts of xylene in the sealed phial and capillary If broken under normal circumstances the fluid does not cause a problem but in case of skin contact wash with cold water If swallowed drink plenty of water and seek medical attention CONTENTS DESCRIPTION SECTION PAGE No INSTRUCTIONS Introduction 3 ighti i 4 FOR USE Lighting the Boiler General Data 1 5 Poea LETON Water Systems 2 7 INSTRUCTIONS Flue and Ventilation 3 8 Installation 4 10 Casing Location Fitting 5 12
6. CAPTIVE NUT top casing STRAP fitted when no g amp STRAP FITTING No top casing No 8 SECURING SCREW 0909 SIDE CASING R H Diagram 5 4 13 221691B 6 Electrical Wiring 6 1 Control Box Cable Connection Warning This boiler must be earthed Remove the screw and cover from the mains inlet connector supplied loose see diagram 6 1 Using heat resistant flexible cable of suitable length and rating as in Section 1 6 connect the three cables to the required terminals in the connector Secure the outer sheathing with the cable clamp Engage slots and lugs replace cover and secure with screw Connect the mains inlet connector to the control box and use three of the cable clips supplied loose pushed on to the edge of the left hand panel in positions CB as shown in diagram 6 2 to make sure the cable does not make contact with any hot surfaces 6 2 Pump Cable Connection Heat resistant cable with a rating as stated in Section 1 6 must be used for all wiring near the boiler including the pump if within the boiler casing Support pump cable away from hot surfaces if within the boiler casing by pushing two cable clips supplied loose on to the top edge of one side panel shown as P or AP in diagram 6 2 6 3 System Controls The electrical installation must be made according to the current issue of BS7671 The electrical isolator must isolate both the boiler
7. and any system controls 6 4 Testing Checks to ensure electrical safety should be carried out by a competent person In the event of an electrical fault after installation of the boiler preliminary system checks must be carried out that is earth continuity polarity and resistance to earth as described in the British Gas Multimeter Instruction Book or similar publication 221691B 14 rR S MAINS INLET CONNECTOR Dianna 230 9 in Fit 2 pump cable 3 oO clips at positions P P 1 in F 9 in Alternative pump cable clips if feed is on the right hand side at positions AP Fit 3 control box feed cable K clips at positions A CB CABLE CLIP POSITIONS Diagram 6 2 7 Commissioning Please ensure the Benchmark logbook is completed and left with the user 7 1 Commissioning and Testing the Boiler The whole of the system should be thoroughly flushed out with cold water with the pump removed Make sure that all valves are open Refit the pump and fill the system Examine for water soundness and vent all air from the system including the pump CAUTION The following work should be carried out by a competent person Identify the boiler controls by reference to diagram 7 1 Check that the gas service tap K is closed indicator line horizontal Open all windows and put out any naked lights pipes or cigarettes Purge air from the gas supply in accord
8. flame failure device should have closed indicated by a click from the gas valve Do not attempt to relight until 3 minutes have elapsed Remove the pressure gauge and refit test nipple screw G Turn thermostat B to O then relight the pilot burner as the relevant part of this Section Check that the boiler thermostat and all automatic controls are working correctly Do not attempt to adjust the thermostat calibration screw Relight the main burner and check for gas soundness with a suitable leak detection fluid 7 2 Commissioning the System Allow the system to heat up and set the pump adjuster to a design position which gives a temperature difference of 11 C 20 F across the boiler There should be no undue noise in the system and no pumping over of water or entry air at the open vent Allow the system to reach maximum temperature and examine for water soundness The boiler should then be turned off and the system drained as rapidly as possible to complete the flushing process The system should then be filled again vented and examined for water soundness 7 3 Completion Instruct and demonstrate the efficient and safe operation of the boiler and system Hand the Instructions for Use to the user for their retention making sure that they are understood Advise the user that to ensure continued efficient and safe operation of the boiler it is recommended that it is checked and serviced at regular i
9. tap in ignition position Ignite burner allowing thermocouple to attain operating temperature Measure the OPEN CIRCUIT voltage Faulty thermocouple Replace Note the open circuit reading then measure the CLOSED CIRCUIT voltage Note this voltage Referring to the diagnosis graph mark the open circuit voltage on the VERTICAL axis and the closed circuit voltage on the HORIZONTAL axis Note the point where these two values intersect on the graph THERMOCOUPLE area of the Faulty thermocouple CIRCUIT IS graph is the Replace SATISFACTORY intersect Faulty magnet unit in multi functional control Replace THERMOCOUPLE FAULT FINDING Diagram 10 3 10 2 Thermocouple lt 29 To test the thermocouple a meter with a range of 0 to 30mV is 27 required together with a thermocouple interrupter test unit similar to the British Gas Minitest 6 Unit 25 Refer to thermocouple fault finding chart diagram 10 3 and Log diagnosis graph diagram 10 4 a 10 3 Pilot E v 19 Refer to pilot fault finding chart see diagram 10 5 S 17 S 15 2 51 S 1 Tg Closed Circuit Voltage millivolts DIAGNOSIS GRAPH FOR O 2 4 6 8 10 12 14 16 18 20 22 THERMOCOUPLE CIRCUIT Diagram 10 4 221691B 22 10 Fault Finding Pilot PILOT WILL NOT LIGHT START HERE Check gas line open all cocks rectify any blockages purge out any air Does pilot light Apply match to pilot burner instead of pressing piezo un
10. the cost of All replacement parts REGISTER YOUR GLOW WORM APPLIANCE W All labour charges FOR 1ST YEAR GUARANTEE PROTECTION ff All call out charges CALL 0208 247 9857 Customer Services Hepworth Heating Ltd Nottingham Road Belper Derbyshire DE56 1JT Tel 01773 828100 General Sales enquiries One Contact Local Service Fax 01773 828070 Tel 01773 824141 Fax 01773 820569 Important Information Testing and Certification This boiler is tested and certificated for safety and performance Itis therefore important that no alteration is made to the boiler without permission in writing from Hepworth Heating Ltd Any alteration not approved by Hepworth Heating Ltd could invalidate the certification boiler warranty and may also infringe the current issue of the Statutory Requirements see Section 1 3 CE Mark This boiler meets the requirements of Statutory Instrument No 3083 The boiler Efficiency Regulations and therefore is deemed to meet the requirements of Directive 92 42 EEC on the efficiency requirements for new hot water boilers fired with liquid or gaseous fuels Type test for purposes of Regulation 5 certified by Notified body 0086 Product productioncertifiedby Notified body 0086 The CE mark on this appliance shows compliance with 1 Directive 90 396 EEC on the approximation of the laws of the Member States relating to appliances burning gaseous fuels 2 Directive
11. the wall Make a good seal around the boiler air duct on the inside wall Take the balanced flue assembly from its carton and remove the four screws to release the outer baffle see diagram 4 8 Remove the four outer wire guards then pull off the inner baffle and flue duct assembly Place the air duct assembly into the hole in the wall from the outside engaging it around the air duct on the boiler and sliding it until the wall plate contacts the outer wall surface Seal the jointin the air ducts with the yellow tape provided Tape four pieces into the four inside corners followed by four along the joints overlapping the corner pieces to make a good seal Allow a minimum of 20mm in overlap of ductings Cement around the wall plate to make good and weatherproof Refit the inner baffle and flue duct assembly sealing the joint with the heat resistant semi transparent tape provided Refit wire guards outer baffle and secure with screws 11 ALTERNATIVE FLOW CK 0874 ALTERNATIVE Clee POSITIONS With distributor tube not shown WATER CONNECTIONS FULLY PUMPED SYSTEMS Diagram 4 4 1524 VIEW ON ARROW A lt 57 MAX 2 1 4 in PIPEWORK ae CLEARANCES Diagram 4 5 1525 VIEW ON ARROW B es MAX p Can a lt 7 2 1 in MINIMUM gc CLEARANCE 57 MAX 2 1 4 in REAR CONNECTION PIPEWORK 28mm Diagram 4 6
12. Atthe appropriate pumped flow rate the pressure loss through the boiler can be found from the graph diagram 2 3 Use a pump with integral valves or fit isolating valves as close to the pump as possible Note If the pump is to be fitted inside the boiler casing a heat shield kit is required Kit No 425837 2 6 Cylinder For all systems supplying domestic hot water the cylinder must be indirect 2 7 Safety Valve A safety valve need not be fitted to an open vented system 2 8 Draining Tap A draining tap must be provided at the lowest points of the system which will allow the draining of the entire system including the boiler and hot water cylinder Draining taps should be to the current issue of BS2879 22mm VENT R S 15mm COLD FEED 1 metre TO INDIRECT MIN CYLINDER 27metres MAX H To Heating Circuit DRAIN OFF Distributor tube in COCK pumped return connection FULLY PUMPED SYSTEM DIAGRAMMATIC Diagram 2 2 FLOW RATE GALLON MINUTE o 0 1 2 3 4 5 6 99 800 32 T P as F Li ef Q g Wwe Ww aod ok D 50 n YQ Oh Og W O W ui ca cr x m o ow cw a Eg E SE e 0 4 8 12 16 20 24 28 FLOW RATE LITRES MINUTE PRESSURE LOSS OF BOILER Diagram 2 3 3 Flue and Ventilation 3 1 Flue Detailed recommendations for flues are given in the current issue of BS5440 Part 1 The boiler must be installed so that the flue terminal is exposed to the external air Itis important that th
13. ES 75 F FROM INTERNAL OR EXTERNAL CORNERS 600 G ABOVE ADJACENT GROUND OR BALCONY LEVEL 300 H FROM A SURFACE FACING THE TERMINAL 600 FACING TERMINALS 600 J FROM OPENING DOOR WINDOW IN CARPORT INTO DWELLING 1200 K VERTICAL FROM A TERMINAL 1500 L HORIZONTALLY FROM A TERMINAL 300 Diagram 3 1 COMPARTMENT AIR VENT TABLE COMPARTMENT VENTILATION HIGH LEVEL LOW LEVEL REQUIREMENTS VENT AREA VENT AREA VENTILATION FROM ROOM 22in 136cm 22in OR SPACE FROM 2 in2 2 in2 OUTSIDE 68cm 11in 68cm 11in 221691B 4 Installation Before fixing the boiler make sure that the location selected is in accordance with the requirements of Section 1 7 4 1 Unpacking The boiler casing panels are packed separately within the main carton and are designed to enable gas and water connections to be made before fitting the casing panels The casing brackets distributor tube and loose items in a plastic bag are packed in the top fitment 4 2 Casing Brackets Fit the two upper and two front casing brackets shown in diagram 4 1 using eight of the No 8 screws Push the captive nuts supplied loose onto the casing brackets as shown in diagram 4 1 4 3 Water Connections Gravity Domestic and Pumped Heating Fit suitable fittings into the boiler tappings see diagram 4 2 Make sure that all pipes are taken backwards and will clear the casings see diagram 1 1 Heating flow Any one of the four upper connecti
14. F Test for gas soundness around the boiler with a suitable leak detection fluid Set the burner gas rate required ten minutes from lighting see page 2 for settings Adjust screw F diagram 7 1 to obtain the required heat input Turn anti clockwise to increase The adjusting screw should then be sealed Should there be any doubt about the gas rate it should be checked at the meter This should be in the range of Hideaway 40B 1 1 to 1 4m h 38 to 50ft8 h These rates are for guide purposes depending on the heat setting Stick the self adhesive arrow indicator onto the data label against the output the boiler is to be set to the arrow is in the fittings pack Q 3 H SETTING POINTS aH A GAS CONTROL KNOB J PHIAL POCKET B TERMOSTAT CONTROL K GAS SERVICE COCK K C PIEZO IGNITION BUTTON L DATA LABEL Shown E VIEWING WINDOW closed F BURNER GAS RATE GAS CONTROL KNOB A ADJUSTMENT POSITIONS G BURNER PRESSURE OFF TEST POINT 7 Gy CONTHOLIBOX a PILOT IGNITION MAIN BURNER BOILER COMPONENTS Diagram 7 1 15 221691B 7 Commissioning Check the operation of the flame failure device as follows with the main burner alight turn gas control knob A fully anti clockwise to its stop the main and pilot burners will go out Relighting the boiler will not now be possible as a safety device has been activated After 60 seconds the
15. OCATION WASHER 1870 RETAINING SPLIT PIN SECURING THE THERMOSTAT PHIAL Diagram 8 2 COMBUSTION CHAMBER lt SCREW COVER 0930 ACCESS FOR SERVICING Diagram 8 3 ime 0907 MAINS INLET CONNECTOR PULL UPWARD ISOLATION OF GAS AND ELECTRICITY Diagram 8 1 17 FLUEWAY CLEANING io DOOR PA SCREW 4 0000 0000 ACCESS TO FLUEWAY Diagram 8 4 0908 221691B 8 Servicing 8 2 Burner and Injector Follow instructions to remove the cover burner and controls assembly as in Section 8 1 Remove the two screws and nuts securing the burner support bracket to the combustion chamber cover see diagram 8 7 Remove the graphite coated nuts on the supply feed pipe at the rear of the burner to release the burner take care not to damage the pilot burner and shield when removing Clean burner thoroughly Check the main burner injector for blockage or damage and replace if necessary see Section 9 2 and diagram 8 8 8 3 Service Checks Inspect the pilot burner thermocouple and clean or replace as necessary If necessary remove the pilot shield by removing the securing screw and nut Check the condition of the side and rear insulation panels in the combustion chamber Check the condition of the seals on the cleaning door and the combustion chamber cover Replace all items inthe reverse order relight a
16. OILER WITH TOP CASING gin CUPBOARD MINIMUM CLEARANCES UNDER WORKTOP FIXTURES BOILER WITHOUT TOP CASING 3 g in Diagram 1 4 1 General Data The base temperature is within the requirements of the current issue of BS5258 The boiler may stand on a wooden floor but a metal base plate is required to protect plastic tiles and similar floor coverings When the boiler is to be installed level with work surfaces and the like minimum clearances should be provided as shown in diagram 1 3 Work tops which overhang the cupboard sides almost in contact with the casing top require a larger minimum air gap Flush sided fixtures require the same overall minimum space but can have a reduced air gap on one side Boilers to be installed under work tops or fixtures with or without the casing top fitted should be positioned to provide minimum clearances as shown in diagram 1 4 To facilitate minimum clearances it may be necessary to modify kitchen units and fixtures A front access clearance should be provided as shown in diagram 1 5 The boiler may be installed in any room although particular attention is drawn to the requirements of BS7671 with respect to the installation of a boiler in a room containing a bath or shower Any electrical switch should be so positioned that it cannot be touched by a person using the bath or shower The electrical provisions of the Building Standards Scot
17. ance with the current issue of BS6891 Make sure that the thermostat phial is positioned at the bottom of the phial pocket J located by the washer being behind the split pin See that the mains electrical supply is switched off Set thermostat control knob B to O Remove gas pressure test nipple screw G and fit a suitable pressure gauge Open gas service cock K Turn gas control knob A to 4 ignition and pilot position and push in At the same time push and release piezo unit button C until the pilot burner lights At this stage air may be present in the gas pipes and the lighting operation may need repeating When the pilot is alight keep control button A fully pushed in for about 15 seconds If the pilot burner fails to stay alight repeat the lighting procedure but now keep the control button pushed in for a little longer Ifthe gas control knob A is turnedto asafety lock prevents it being turned on again No attempt should be made to push in knob A until 3 minutes have gone by Make sure that the pilot burner is alight and stable see diagram 7 2 for flame dimensions then switch the electrical supply on Set any remote controls for duty Turn control knob A to main burner position Set thermostat control knob B between MIN and MAX opposite the setting point on the control box the main burner will then light MAX is about 82 C 180
18. ata Refer to BOILER CASING HEIGHT diagram t A SPECIAL TOP CASING waATER CONNECTIONS TO SUIT 600mm 235 in WORKTOPS IS AVAILABLE amp GAS CONNECTION Re py 1 2 in B S P T Rc1 tin B S P T F MIN a G MIN j OWATER CONNECTIONS Rc1 reduced with DISTRIBUTOR TUBE to Re 3 4 3 4 in B S P T pumped return 0684 Sheet Metal Parts WARNING When installing or servicing this boiler care should be taken to avoid any possibility of personal injury when handling the edges of sheet metal parts Important Notice This boiler is for use only on G20 gas Wherever possible all materials appliances and components to be used shall comply with the requirements of applicable British Standards Where no British Standard exists materials and equipment should be fit for their purpose and of suitable quality and workmanship 1 1 Data Approximate weight of complete boiler 79kg 174lb Water content Gas connection Water connection Injector 40B Electrical supply Burner Aeromatic 5 76 litre 1 27gallons Re in BSPT Rc1 1in BSPT 3 40Mm 240V 50Hz fused 3A All dimensions are given in millimetres except as noted The Seasonal Efficiency Domestic Boilers UK SEDBUK is 71 5 The value is used in the UK Government s Sta
19. bitors in central heating systems If an inhibitor is to be used in the system contact should be made with the inhibitor manufacturers so that they can recommend their most suitable product When using in an existing system take special care to drain the entire system including the radiators then thoroughly cleaned out before fitting the boiler whether or not adding an inhibitor REFER TO BS 5546 0869 4 22mm VENT 15mm COLD FEED INDIRECT CYLINDER 2 7metre Max BOILER G To Heating Circuit DRAIN OFF COCK Distributor tube in pumped return connection Diagram 2 1 221691B 2 Water Systems 2 3 Gravity Domestic and Pumped Heating It is recommended that a cylinder thermostat is used to prevent the stored water temperature becoming unnecessarily high when the central heating pump is off The domestic primary flow and return must be 28mm o d The installation must comply with the current issue of BS5546 and BS6700 see diagram 2 1 Ifthe above conditions cannot be met itis suggested that a fully pumped system be used 2 4 Pumped Heating and Hot Water Where a single flow and return is taken from the boiler a minimum static head of 1metre 3ft3in must be provided between the water line of the feed tank and the centre of the waterway see diagram 2 2 2 5 Circulation Pump Normally the pump should be setto give atemperature difference of 11 C 20 F across the boiler
20. central over the terminal Guards are available from Tower Flue Components Ltd Morley Road Tunbridge Kent TN9 1RA quoting reference type F 3 5 Wall Thickness Check the wall thickness where the boiler is to be fitted Flues available are Standard Pack part No 424671 280 to 410mm 11 to 16in Short Pack part No 424672 150 to 280mm 6 to 11in Extension Kit part No 424680 standard pack 410to610mm 16 to 24in 3 6 Room Ventilation The boiler is room sealed and does not require the room or space containing it to have permanent air vents 3 7 Cupboard and Compartment Ventilation Where the boiler is fitted in a cupboard or compartment the high and low level permanent air vents must have effective areas in accordance with Compartment Air Vent Table Both the high and low level air vents must communicate with the same room or must both be on the same wall to outside air O gt 1112 Aap I B IX P O Sa O Under Car Port etc MINIMUM SITING DIMENSIONS FOR BALANCED FLUE TERMINALS POSITION MINIMUM SPACING A DIRECTLY BELOW AN OPENABLE mm WINDOW AIR VENT OR ANY OTHER VENTILATION OPENING 300 B BELOW GUTTER DRAIN SOIL PIPE 300 C BELOW EAVES 300 D BELOW A BALCONY OR CAR PORT 600 E FROM VERTICAL DRAIN PIPES AND SOIL PIP
21. connectthe thermocouple nut and withdraw the thermocouple from the pilot burner see diagram 9 3 Remove the spark electrode secured by a nut Replace in reverse order checking that the spark gap is as shown in diagram 7 2 9 8 Insulation Panels Follow the relevant instructions in Section 8 1 Remove the two screws retaining each side insulation panel within the combustion chamber and remove panel see diagram 9 4 Release the rear insulation panel clips and lift out panel Replace in reverse order Replace thermostat phial as in Section 8 1 221691B 20 SECURING SCREW 2 28 A a AND NUT 2 S SPARK THERMOCOUPLE ELECTRODE IGNITION LEAD CLEAR END PILOT A SHIELD Z PILOT PILOT TUBE BURNER PILOT ri ASSEMBLY INJECTOR PILOT ASSEMBLY Diagram 9 3 REAR SIDE S INSULATION INSULATION S PANEL PANEL CLIP 9 BAFFLE TRAY SCREW LER GRAPHITE COATED gt amp NUT 3 INSULATION PANELS Diagram 9 4 10 Fault Finding Electrical 10 1 Electrical 2 Refer to electrical fault finding chart diagram 10 1 functional THERMOSTAT GAS VALVE S flow diagram 10 2 and wiring diagram 9 2 CONTROL IMPORTANT The preliminary electrical system checks as SOLENOID contained in the British Gas Multimeter Instruction Book
22. e not shown DOMESTIC RETURN TO ANY OF THE 3 REMAINING LOWER CONNECTIONS WATER CONNECTIONS GRAVITY_ DOMESTIC PUMPED HEATING Diagram 4 2 0871 Notch on DISTRIBUTOR must lie within the shaded area BETWEEN TWO MARKERS J N DN DISTRIBUTOR TUBE MUST BE IN PUMPED RETURN CONNECTION MARKERS DISTRIBUTOR TUBE Diagram 4 3 4 Installation 4 6 Pipework When the front tappings are used it is essential that any pipework of fittings do not project more than shown in diagram 4 5 When using a rear tapping with Re 1in BSP fitting for 28mm od pipework it is recommended that a short nipple and an R thread BSP to copper elbow is used If the pipework is required to run back to the wall make sure that it will clear the boiler air duct and if working to minimum clearance does not stick out too far from the boiler see diagram 4 6 Do not route any pipework water or gas across the front of the thermostat pocket controls or combustion chamber cover The gas pipework must be along the right hand side of the boiler 4 7 Balanced Flue Terminal Standard and short flue Mark out and cut a hole through the wall where the boiler is to be installed to the dimensions shown in diagram 4 7 after checking that sufficient clearances will be left around the boiler as described in Section 1 7 Place the boiler in position The balanced flue ducting will project into the prepared hole in
23. e position allows the free flow of air across it at all times 3 2 Terminal Positioning The minimum acceptable spacings for the terminal to obstructions other terminals and ventilation openings are given in diagram 3 1 Car port or similar extensions of a roof only or roof and one wall require special consideration with respect to openings doors and windows under the roof Care is required in protecting the roof if made from plastic sheeting Seek further advice if the car port consists of a roof and two or more walls from the local gas undertaking 221691B Where the terminalis within 850mm 34in below plastic guttering an aluminium shield 1 5metres 5ft long should be fitted to the underside and immediately beneath the guttering The air inlet and products outlet duct and the terminal of the boiler must not be closer than 25mm lin to combustible material 3 3 Timber Frame Building If the boiler is to be installed in a timber frame building it should be fitted in accordance with the Institute of Gas Engineers document IGE UP 7 1998 If in doubt seek advice from the local gas undertaking or Hepworth Heating Ltd 3 Flue and Ventilation 3 4 Terminal Guard A terminal guard is required if persons could come into contact with the terminal or the terminal could be subject to damage If a terminal guard is required it must be positioned to provide a minimum of 50mm clearance from any part of the terminal and be
24. fully pushed in for about 15 seconds then release If the burner fails to stay alight wait 3 minutes then repeat the lighting procedure only now keep control knob A pushed in for a little longer before releasing Press in and turn gas control knob A anticlockwise until is against its setting point If the gas control knob A is turned to 2 safety lock prevents it being turned on again for a short period No attempt should be made to relight the pilot until 3 minutes have elapsed Make sure that the pilot is alight and stable then switch on the electrical supply Set any system controls to ON or HIGH Turn the boiler thermostat knob B clockwise until MAX is against its setting point and the main burner will light Adjust thermostat to required setting between MIN and MAX MAX is about 82 C 180 F Refit the door by locating the hooked runner at the bottom into the slot in the side panels and pushing onto the studs 221691B To Turn the Boiler Off For short periods turn the boiler thermostat control knob B anticlockwise to O The pilot will stay alight To relight the main burner turn thermostat control knob B clockwise to the desired setting between MIN and MAX For longer periods depress slightly and turn gas control knob A fully clockwise until is against its setting point Turn thermostat control knob B anticlockw
25. g sides to the front upper brackets 5 Casing Location Fitting 5 3 Top Casing Fit four plastic pegs into the appropriate holes in the top casing if being fitted see diagram 5 3 The plastic pegs are a tight fit and are best pushed home with a flat faced tool The top casing can be arranged to fit flush with or overhang the door The top casing is reversible to match when level with square or rolled edge work surfaces Push the top casing on to all four side casing locations From inside the casing check that all rivets have located correctly For boilers fitted under work tops not using the top casing the strap should be fitted using two No 8 screws see diagram 5 4 PLASTIC PEG 9 S g SIDE VENT GRILLE i a If required will fit to G o left or right side casing C SIDE CASING R H SHOWN I SIDE VENT GRILLE Diagram 5 1 UPPER CASING S BRACKET lt A LOCATING LUG AND SLOT JCH UG SLOTS 9 MIN 2 MID gt SMAX MAX cI MID D FRONT 9 CASING A p MIN BRACKET BOILER PLINTH SIDE CASINGS FITTING Diagram 5 2 PLASTIC PEG 4 0886 TOP CASING PEG POSITIONS IN TOP CASING A FRONT EDGE FLUSH B 10mm 3 g in FRONT OVERHANG SIDE CASING DOOR BOILER SHOWN WITH piip I ROLLED EDGE FLUSH i SIDE CASING DOOR BOILER SHOWN WITH I SQUARE EDGE FLUSH TOP CASING FITTING Diagram 5 3
26. g the gas valve Relighting should be carried out as in Section 7 1 9 2 Injector When the burner has been removed from the injector manifold as in Section 8 2 the injector can be unscrewed from the manifold and renewed as necessary When replacing use a little jointing compound on the external thread only to ensure a gas tight seal Replace in reverse order Replace thermostat phial as in Section 8 1 9 3 Thermocouple Remove the door and plinth as in Section 8 1 Disconnect thermocouple by unscrewing nuts at gas valve and pilot burner see diagrams 9 1 and 9 3 Release the cable clips and the thermocouple can be withdrawn Reassemble in reverse order 9 4 Pilot Burner Follow instructions in Section 8 1 to remove cover and burner controls assembly Disconnect the thermocouple nut atthe pilot burner see diagram Disconnect the nut retaining the pilot tube and injector in the pilot burner Disconnect nut retaining electrode Remove the two screws and nuts securing the pilot burner and shield to the front cover see diagram 9 3 Reassemble in the reverse order checking that the spark gap and pilot flame length are as shown in diagram 7 2 Replace thermostat phial as in Section 8 1 9 5 Boiler Thermostat Follow relevant instructions in Sections 8 1 and 9 1 Pull off the thermostat control knob Remove the two screws which secure the boiler thermostat to the control box see diagram 9 1 Tilt the thermostat
27. ied out by a competent person If this appliance is installed in a rented property there is a duty of care imposed on the owner of the property by the current issue of the Gas Safety Installation and Use Regulations Section 35 To obtain service please call your installer or Heatcall Glow worm s own service organisation using the telephone number given on the inside of the front panel Please be advised that the Benchmark logbook should be completed by the installation engineer on completion of commissioning and servicing All CORGI Registered Installers carry a CORGI ID card and have a registration number Both should be recorded in your boiler Logbook You can check your installer is CORGI registered by calling CORGI direct on 01256 372300 Boiler Electrical Supply WARNING This boiler must be earthed The boiler must only be connected to a 240V 50Hz supply protected by a 3A fuse maximum All wiring must be in accordance with the current issue of BS7671 Heat resistant flexible cable having a conductor size of 0 75mm to the current issue of BS6500 Table 16 must be used PIEZO IGNITION BUTTON C GAS CONTROL KNOB A THERMOSTAT CONTROL KNOB B SETTING POINTS M GAS CONTROL KNOB OFF 4k PILOT IGNITION MAIN BURNER 7 Diagram 1 40 BALANCED FLUE 221691B Instructions for Use To Connect an Electrical P
28. in plug both to the current issue of BS1363 Alternatively a 3A fused double pole isolating switch may be used having a minimum double pole contact separation of 3mm serving only the boiler and system controls Heat resistant cable of at least 75mm 24 0 20mm to the current issue of BS6500 Table 16 must be used for all connections within the boiler casing to the control box pump etc 1 7 Boiler Location The casing can be fitted to the boiler at various heights The top casing can be discarded if preferred when fitting the boiler under a low worktop or fixture Refer to diagram 1 2 The boiler must stand on a level floor conforming with local authority requirements and building regulations 221691B 0982 To floor level BOILER WITH TOP CASING MAX 900 351 5 in MID 890 35in MIN 860 34in MAX BOILER WITHOUT TOP CASING MAX 867 341g in MID 857 333 4 in MIN 827 321 in MID MIN we FLOOR LEVEL BOILER CASING HEIGHT S BOILER CASING ALTERNATIVE HEIGHT POSITIONS Diagram 1 2 WORKTOP 0866 320 MIN 125 g in 10 320 MIN 125 g in CUPBOARDS a 3g in MINIMUM CLEARANCES LEVEL WITH WORKTOP Diagram 1 3 WORKTOP OR FIXTURE CUPBOARD 10 3g in 3 1 8 in 0865 CUPBOARD y a2 10 10 10 i 3g in B
29. ise to O Isolate the boiler from the electrical supply Follow full lighting procedure to relight Refer also to Protection Against Freezing Gas Leak or Fault Ifa gas leak fault exists or is suspected the boiler must be turned off including the electrical supply and must not be used until the fault has been put right Advice help should be obtained from the local gas undertaking or your installation servicing company Protection Against Freezing If the boiler is to be out of use for any period of time during severe weather conditions we recommend the whole system including the boiler be drained off to avoid the risk of freezing up If an immersion heater is fitted to the hot water cylinder make sure it is switched off Sheet Metal Parts WARNING This boiler contains metal parts components and care shouldbe taken when handling and cleaning with particular regard to edges Cleaning Keep the casing clean by wiping it occasionally with a damp soapy cloth and dry with a polishing cloth Do not use abrasive cleaners Replacement Parts Boiler Identification If replacement parts are required apply to your local supplier Please quote the name of the boiler and its serial number which can be found on the data label positioned on the boiler top to the rear of the inclined flueway cleaning door Clearances Minimum clearances must be left around the boiler as shown in diagrams 1 3 1 4 amp 1 5 General D
30. it button Does pilot light Undo tubing nut at pilot burner Turn gas valve knob to Pilot Ign Press gas valve knob Does gas flow freely Rectify blockage in pilot injector or renew pilot injector Undo tubing nut at pilot outlet of gas valve Press gas valve knob Does gas flow freely Change blocked pilot tube Change gas valve BOILER PILOT FAULT FINDING Does pilot stay alight when gas valve knob is released PILOT SATISFACTORY Does pilot flame envelop thermocouple Check aeration If necessary Clean pilot rectify blockage in pilot injector or replace Check thermocouple circuit using Thermocouple and Boiler Overheat Cut Off fault finding On pressing piezo unit button is there a spark across electrode gap Pull ignition lead off electrode Hold end of lead close to pilot burner and operate piezo unit Is there a spark across gap Pull ignition lead off piezo unit Using blade of a screwdriver touch unit chassis and leave approx 4mm gap from connection tag on piezo unit Operate piezo Is there a spark across gap Change ignition lead Check electrode gap Reposition or replace electrode as necessary 0905 Diagram 10 5 221691B 11 Spare Parts The key number in the first column of the list will help identify If ordering from British Gas you will also require the GC each part in diagram 11 1 appliance number off the data label and the required s
31. lacement of parts 8 1 Boiler Flueways Pull door forwards at the top to disengage studs and lift to release from slots see diagram 7 3 Lift the plinth front up and forwards to withdraw see diagram 7 3 Disconnect the union on the gas service cock see diagram 8 1 Remove the mains inlet connector by pulling upwards see diagram 8 1 Remove the retaining split pin on the thermostat phial pocket then withdraw the phial and capillary see diagram 8 2 Remove the four screws retaining the combustion chamber cover and burner assembly see diagram 8 3 Withdraw forwards the complete assembly of cover control box and burner Remove the securing nut to release baffle tray and remove from combustion chamber taking care not to damage the insulation material on the sides Remove the self tapping screws which retain the cleaning door and lift clear see diagram 8 4 Remove flueway baffles see diagrams 8 5 and 8 6 Place a sheet of paper in the combustion chamber to catch any flue debris Thoroughly clean boiler flueways and fins with a suitable stiff brush Replace in reverse order after completing the relevant instructions in Sections 8 2 and 8 3 Make sure that the thermostat phial is at the bottom of its pocket and located by the location washer being behind the retaining split pin see diagram 8 2 Make sure that there is clearance between the thermostat capillary and the boiler THERMOSTAT CAPILLARY gt L
32. land Regulations apply to such installations in Scotland Where the installation of the boiler will be in an unusual location special procedures are necessary the current issue of BS6798 gives detailed guidance on this aspect A compartment used to enclose the boiler must be designed and constructed specifically for this purpose An existing cupboard or compartment modified for the purpose may be used Details of essential features of cupboard or compartment design are given in the current issue of BS6798 1 8 Heating System Controls The heating system should have installed a programmer and room thermostat controlling the boiler Thermostatic radiator valves may be installed in addition to the room thermostat Note For further information see The Building Regulations 1991 Conservation of fuel and power 1995 edition Appendix G table 4b 0906 BOILER 700 271 2 in t gt WALL OR FIXTURE FRONT CLEARANCE Diagram 1 5 2 Water Systems 2 1 Water Pressure Head The boiler shall only be connected to a cistern water supply with a minimum head of 1metre 3ft3in and a maximum head of 27metres 90ft which has an open vent in the system The working pressure must be within the range 0 1bar to 2 7bar 1 3 to 39lbftin The boiler MUST NOT be connected to a sealed water system 2 2 Inhibitor Attention is drawn to the current issue of BS5449 and BS7593 on the use of inhi
33. lug The standard colours of three core flexible cable are Brown live Blue neutral Green and Yellow earth As the markings on your plug may not correspond with these colours continue as follows The Blue cable must be connected to the terminal marked N or Black The Brown cable must be connected to the terminal marked L or Red The Green and yellow cable must be connected to the terminal marked E or Green or the earth symbol Q To Light the Boiler WARNING If the pilot light goes out for any reason do not attempt to relight until 3 minutes have elapsed Remove the door by pulling forwards with the fascia at the top Lift up to disengage from the bottom side lugs Refer to diagram 1 to identify controls Check that the mains electrical supply to the boiler is switched OFF Push in slightly and turn gas control knob A clockwise until is against its setting point Turn thermostat control knob B anticlockwise until O is against its setting point Pushin slightly and turn gas control knob A anticlockwise until is against its setting point then depress fully and hold in Push in and release piezo ignition button C until the pilot burner lights Air may be present in the supply pipe so the lighting of the pilot may need to be repeated until all the air has been expelled When the pilot is alight view through window E keep gas control knob A
34. nd test the boiler 6141 FLUE BAFFLE 2 HEAT ae EXCHANGERS S FLUEWAY BAFFLE Diagram 8 5 221691B 18 D 5 Diagram 8 6 COMBUSTION CHAMBER 2 COVER MAIN a BURNER SUPPLY FEED PIPE SCREW 2 GRAPHITE BURNER COATED BRACKET REMOVAL OF BURNER FROM COMBUSTION CHAMBER l SUPPLY FEED PIPE Diagram 8 7 2 SUPPLY MAIN 2 FEED PIPE BURNER l INJECTOR GRAPHITE COATED NUT 2 BURNER SERVICING Diagram 8 8 9 Replacement of Parts Before removing or replacing any parts turn off the gas supply at the gas service cock see diagram 8 1 and isolate the electrical supply to the appliance Always test for gas soundness after replacing any gas carrying component 9 1 Gas Valve Follow relevant instructions in Section 8 1 Remove control box cover by removing screw and unhooking at the side see diagram 9 1 Disconnect electrical connectors thermocouple nut and pilot tube at the gas valve Remove the two screws which secure gas valve to control box Tilt control box to enable it to be lifted off the gas valve Unscrew the half union from gas valve Unscrew gas valve from burner supply pipe When screwing the pipe into the new valve use a little jointing compound on the external thread only to make a gas tight seal Replace thermostat phial as Section 8 1 Reassemble in reverse order It will be necessary to purge the system of air after changin
35. ndard Assessment Procedure SAP for energy rating of dwellings The test data from which it has been calculated have been certified by B S I 1 2 Range Rating This boiler is range rated and may be adjusted to suit individual system requirements The table gives settings and outputs The boiler input as supplied is preset to the maximum heat input and should be adjusted to suit system requirements The indicator arrow should be stuck on the data label to indicate the adjusted setting The arrow is supplied in the loose items pack RANGE RATING min medium max NOMINAL kw 11 23 13 01 14 79 HEAT INPUT GROSS Btu h 38 300 44 400 50 450 NOMINAL kW 8 79 10 26 11 72 HEAT OUTPUT Btu h 30 000 35 000 40 000 BURNER mbar 6 6 8 9 11 6 SETTING PRESSURE in w g 2 6 3 6 4 6 HOT INJECTOR K7218 221691B General Data 1 3 Statutory Requirements The installation of this must be carried out by a competent person and mustbe in accordance with the relevant requirements of the current issue of Manufacturer s instructions supplied The Gas Safety Installation and Use Regulations Building Regulations Local Water Company Bye laws The Building Standards Scotland Regulations applicable in Scotland Health and Safety at Work Act Control of Substances Hazardous to Health Electricity at Work Regulations and any applicable local regulations Detailed recommendations are contained in the curre
36. ntervals The frequency of servicing will depend upon the particular installation and usage but in general once a year should be enough It is the law that any servicing must be carried out by a competent person Draw attention if applicable to the current issue of the Gas Safety Installation and Use Regulations Section 35 which imposes a duty of care on all persons who let out any property containing a gas appliance Reminder Leave these instructions and the Benchmark logbook with the user Fitthe plinth front by locating the sides over the boiler plinth then lowering to engage the upper and lower hooks see diagram 7 3 Fit the door by locating the hooked runner at the bottom into the slots in side casings and push on to the studs on the side casings see diagram 7 3 221691B 16 PILOT FLAME DIMENSION SPARK GAP 13 in y DIMENSION FLAME APPROX amp DIMENSION EEE T Fact m Pilot shield igi omitted for clarity VIEWING WINDOW BURNER ASSEMBLY Diagram 7 2 0887 STUD ae FASCIAN ie PLINTH FRONT PeR a LOWER HOOK VIEW 2 PLINTH DOOR FITTING Diagram 7 3 8 Servicing Servicing must be carried out by a competent person Before starting a service turn off the gas supply at the service cock see diagram 8 1 and isolate the boiler from the electrical supply Always test for gas soundness after completing a service or rep
37. ntissue of the following British Standards and Codes of Practice BS6891 BS5440 Part 1 and 2 BS6798 BS5449 BS5546 BS6700 BS7478 BS7593 BS7671 Manufacturer s instructions must not be taken as overriding statutory requirements 1 4 B S I Certification This boiler is certificated by B S 1 for safety and performance It is therefore important that no alteration is made to the boiler unless agreed in writing by Hepworth Heating Ltd Any alteration not approved by Hepworth Heating Ltd could invalidate the B S I certification boiler warranty and could infringe the current issue of the Statutory Requirements 1 5 Gas Supply The gas installation should be fitted in accordance with the current issue of BS6891 The supply from the governed meter must be of adequate size to provide a steady inlet working pressure of 20mbar 8in wg at the boiler On completion test the gas installation using the pressure drop method and suitable leak detection fluid purge in accordance with the current issue of BS6891 1 6 Electrical WARNING This boiler must be earthed The electrical installation must be carried out by a competent person All external components shall be of the approved type and shall be connected in accordance with the current issue of BS7671 and any local regulations which apply Connection of the boiler and any system controls to the mains supply through an unswitched shuttered socket outlet and 3A fused 3 p
38. ons may be used Domestic flow Any one ofthe three remaining upper connections may be used Heating return The water distributor tube must be fitted into either of the front lower connections on all installations see diagram 4 3 This tube is packed in the top fitment Domestic return Any one of the three remaining lower connections may be used for the gravity domestic hot water return Fit plugs into any unused boiler tappings 4 4 Water Connections Fully Pumped Systems Fit suitable fittings into the boiler tappings as required see diagram 4 4 Make sure that all pipes are taken backwards and will clear the casings It is important that all connections are made as shown in diagram 4 4 Fit the water distributor tube into the return connection see diagram 4 3 This tube is packed in the top fitment Fit plugs into any unused boiler tappings 4 5 Pump in Boiler Casing If the pump is to be fitted inside the boiler casing see diagram 6 2 ensure that a heat shield kit is obtained and fitted Kit No 425837 The kit contains a flueway cleaning door with heat shield attached 221691B 10 UPPER CASING _ BRACKET 0888 CAPTIVE NUT No 8 SCREW 8 D ey CAPTIVE FRONT NUT CASING BRACKET CASING BRACKETS FITTING Diagram 4 1 o ALTERNATIVE S HEATING OR KS DOMESTIC gt lt HOT WATER 7 FLOW ALTERNATIVE HEATING O a With distributor GRAVITY tub
39. pare part When ordering spare parts quote the part number and GC number description stating the model and serial number off the data label L see diagram 7 1 oO X Diagram 11 1 Key No Part No Description GC Part No 1 425568 Electrical control box assembly 312 451 2 203329 Gas control valve 384 345 3 K7218 Injector main 3 40 351 790 4 203414 Pilot burner assembly 312 426 5 203508 Injector pilot 395 674 6 202407 Thermocouple c w nut 392 934 6 202415 7 202571 Thermostat c w screws 8 FF2228 Control knob assembly 355 241 9 202700 Piezo unit 384 146 9 202702 Piezo unit 382 585 10 WW4613 Ignition lead 136 399 11 202605 Spark electrode 395 720 12 208302 Sight glass 312 419 Because of our constant endeavour for improvement details may vary slightly from those shown in these instructions 221691B 24
40. so that the electrical connectors can be removed Withdraw boiler thermostat from control box complete with capillary tube and phial attached Refer to diagram 9 2 when re connecting Reassemble in the reverse order Replace thermostat phial as in Section 8 1 GAS VALVE SECURING SCREW GAS MAINS INLET CONNECTOR THERMOSTAT CONTROL KNOB THERMOSTAT SECURING SCREW 2 PIEZO UNIT ELECTRICALS CONNECTORS SLOT w SUPPLY PIPE IGNITION LEAD BLACK END PILOT TUBE CONTROL BOX E LO GAS VALVE X SECURING SCREW ELECTRICAL CONNECTORS COVER SECURING SCREW D CONTROL BOX COVER CR HALF UNION a PIPE n THERMOCOUPLE Diagram 9 1 221691B 9 Replacement of Parts 240V 50Hz MAINS SUPPLY FUSED AT 3A THERMOSTAT GRN YEL BLUE CONTROL BOX WIRING lees CHASSIS EARTH L 6124 lil GAS a VALVE oC 1w ii Diagram 9 2 9 6 Piezo Unit and Ignition Lead Follow the relevant instructions in Section 8 1 Pull off ignition lead at piezo unit see diagram 9 1 To replace lead also pull off the lead at the spark electrode terminal see diagram 9 3 Remove the control box cover by removing securing screw and unhooking at the side see diagram 9 1 Remove the piezo unit secured by a nut inside the control box Replace in reverse order 9 7 Spark Electrode Follow the relevant instructions in Section 8 1 Dis
41. ty thermostat isolate electricity supply and renew thermostat Y YES Le Isolate electricity supply Disconnect orange cable at gas valve Restore electricity supply and turn boiler thermostat F nen 4 i i gt _ aulty orange cable or connection isolate to MAX Is voltage between orange cable connector and as N blue 220 to 240V N electricity supply and renew cable Y YES Isolate electricity supply Disconnect blue cable at gas valve Replace cover of mains inlet connector S Faulty blue cable or connection isolate electricity Restore electricity supply Is voltage between orange supply and renew cable and blue cable connectors 220 to 240V NO YES Isolate electricity supply Re connect orange and blue cables to gas valve Restore electricity supply p Faulty gas valve isolate electricity With pilot burner lit and boiler thermostat set between supply and renew valve MIN and MAX does the main burner light NO Y YES NO Turn boiler thermostat to O Does main burner extinguish NO 4 YES Boiler controls in order ELECTRICAL FAULT FINDING Diagram 10 1 21 221691B 10 Fault Finding Thermocouple vt o Disconnect appliance thermocouple from the multi functional control Check that all connections are clean and in good condition Fit test meter interrupter into the magnet unit Fit appliance thermocouple into the test meter interrupter Hold down control
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