2000225294A.04.04 Instructions for Use Installation and Servicing F24e G.C. No. 47-920-45 HIGH EFFICIENCY CONDENSING COMBINATION BOILER F28e G.C. No. 47-920-39 HIGH EFFICIENCY CONDENSING COMBINATION BOILER F28e SB G.C. No. 41-920-37 HIGH EFFICIENCY CONDENSING SYSTEM BOILER Saunier Duval, Nottingham Road, Belper, Derbyshire. DE56 1JT www.saunier-duval.co.
Guarantee Registration Thank you for installing a new Saunier Duval appliance in your home. Saunier Duval appliances' are manufactured to the very highest standard so we are pleased to offer our customers' a Comprehensive Guarantee. This product is guaranteed for 24 months from the date of installation or 30 months from the date of manufacture, whichever is the shorter, for parts.
Contents 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. CONTENTS DESCRIPTION SECTION PAGE No.
INTRODUCTION - Important Information WARNINGS Gas Leak or Fault Turn off the gas emergency control valve immediately. Eliminate all sources of ignition, i.e.smoking, blowlamps, hot air guns etc. Do not operate electrical lights or switches either on or off. Open all doors and windows,ventilate the area. Sheet Metal Parts This boiler contains metal parts (components) and care should be taken when handling and cleaning, with particular regard to edges.
Introduction - Manual Handling IMPORTANT. With regards to the Manual Handling Operations, 1992 Regulations, the following lift operations are recommended as the appliance weight exceeds a one man lift. Carriage of carton from point of delivery to point of installation - roofspace. Recommend 2-person lift. Ensure co-ordinated movements during lift. Avoid upper body/top heavy bending - do not lean forward/sideways. Clear the route before attempting the lift.
Introduction - Manual Handling Positioning of Appliance for Final Installation - above worktop, foreseeable obstructions etc. Recommend 2 persons lift appliance to position into place. Fit bracket securely onto wall before lifting appliance into position. Obtain firm grip on front and sides of appliance, lift upwards, onto worktop if practicable. Ensure stable balance achieved and lift upwards to position in place on bracket.
User Instructions - Appliance Introduction The EnviroPlus F24e & F28e boilers are wall mounted high efficiency condensing combination boilers with electronic ignition providing central heating and instantaneous hot water. Accessories The EnviroPlus F28e SB boiler is a wall mounted high efficiency condensing system boiler with electronic ignition providing central heating and indirect hot water. For further information contact your supplier. A range of accessories are available.
User Instructions - General Information IMPORTANT NOTE: Clearances Please be advised that the 'Benchmark' logbook should be completed by the engineer on completion of commissioning or servicing. If fixtures are positioned close to the boiler, space must be left as shown in section 2. Enough space must also be left in front of the boiler to allow for servicing. All CORGI Registered Installers carry a CORGI ID card, and have a registration number. Both should be recorded in your benchmark Logbook.
User Instructions - Operating the Boiler 12170 Running lamp illuminated green when burner is lit (fault indicated by a red flashing light) Domestic hot water temperature control knob (F24e & F28e ONLY) Digital Display HEATING "ON" ON/OFF switch HEATING "OFF" Optional Programmer (F24e & F28e ONLY) Central heating control knob Diagram 1 OPERATION OF THE BOILER 1. Check that all isolating valves on the boiler are open and that water flows from the hot water tap. 2.
User Instructions - Operating the Boiler 12211 System Pressurisation (F24e & F28e ONLY) If the digital display shows pressure less than 0.7bar, re-pressurise the system to 1bar by gently opening the built in filling taps underneath the boiler, see diagram 2. Tap extension tools are provided to facilitate this. Using the tap extensions connected to tap (a) and tap (b) open tap (b) and then slowly open tap (a). Re-pressurise the system to a pressure of 1.0 bar indicated on the digital display.
User Instructions - (F24e & F28e ONLY) Optional Programmer 10205 General description The programmer is factory preset which switches the boiler on and off up to three times a day as shown below. FACTORY PRESET TIMES 1st 1st 2nd 2nd 3rd 3rd ON OFF ON OFF ON OFF 6.30 8.30 12.00 12.00 16.30 22.30 Diagram 2 NOTE: The 2nd "ON" and "OFF" preset time will not bring the boiler on. In most cases this may not be required but can be programmed by the user if desired.
User Instructions - (F24e & F28e ONLY) Optional Programmer 10305 To set the programmer ON and OFF times Note: The programmer can be set to give a minimum of one and a maximum of three "ON" and "OFF" times. Place the slide switch to "SET". Press the "enter" button. The display will show the first "ON" time, see diagram 5. Using the + and - buttons, change the first "ON" time to the time you require then press the "enter" button twice.
Net lift weight (boiler only) (F24e 47 kg) (F28e 47 kg) (F28e SB 42 kg) Gross lift weight (boiler and packaging) (F24e 52 kg) (F28e 52 kg) (F28e SB 47 kg) RETURN D.C.W. IN GAS D.H.W. OUT FLOW 12179 1 Technical Data Diagram 1.1 The boiler and fittings pack are delivered in one carton. The flue is supplied separately.
1 Technical Data (F24e ONLY) Heating (F24e ONLY) Hot water Heat input (max) NET Q 25.6 kW 87,347 BTU/H Heat input (min) NET Q 5.0 kW 17,060 BTU/H Heat output (max) GROSS P 25.1 kW 85,641 BTU/H Heat output (min) GROSS P 4.9 kW 16,719 BTU/H Heat output (max) Condensing Mode 26.5 kW 90,418 BTU/H Efficiency - Sedbuk A 90.3% Maximum heating temperature 87° C Expansion vessel effective capacity 8l Expansion vessel charge pressure 0.
2 Technical Information In IE, the installation must be carried out by a competent person and installed in accordance with the current edition of I.S.813 "Domestic Gas Installations", the current Building Regulations and reference should be made to the current ETCI rules for Electrical Installation. IMPORTANT NOTICE Where no British Standards exists, materials and equipment should be fit for their purpose and of suitable quality and workmanship.
3 Heating System Design - The EnviroPlus F24e, F28e and F28e SB are for use with sealed central heating systems. 3.2 Filling the Sealed System - The safety valves are an integral part of the boiler and cannot be adjusted. NOTE: The water pressure at the boiler must be at least 1.2bar to enable filling the boiler to a minimum pressure. If not pressurisation must be carried out by an alternative filling loop. - The circulation pump is integral with the boiler.
12253 10157 3 Heating System Design Additional expansion vessel (if required) Boiler Bypass (if required) Return Drain point 'A' Flow Control valve Diagram 3.2a 12211 Heating circuit TYPE CA FILLING LOOP TAP (a) EXTENSION (F24e & F28e ONLY) TAP (b) EXTENSION Diagram 3.4 Diagram 3.3 4 (F24e & F28e ONLY) Domestic Hot Water System Design All domestic hot water circuits, connections, fittings must be in accordance with the relevant standards and water supply regulations.
11907 5 Boiler Schematic Diagram 5.
12248 5 Boiler Schematic BYPASS (F28e SB ONLY) Diagram 5.
6 Boiler Location, Flue and Ventilation 6.1 Location This boiler is not suitable for outdoor installation. This boiler may be installed in any room, although particular attention is drawn to the installation of a boiler in a room containing a bath or shower where reference must be made to the relevant requirements. The boiler must NOT be installed in a cupboard. In GB this is the current I.E.E. WIRING REGULATIONS and BUILDING REGULATIONS. In IE reference should be made to the current edition of I.S.
6 Boiler Location, Flue and Ventilation 6.3 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 to be central over the terminal. A suitable terminal guard type K3, see diagram 6.2 can be supplied by: Tower flue components Ltd. Morley road, Tonbridge, Kent, TN9 1RA. 6.
7 Installation Preparation and Appliance Fixing 7.1 Unpacking of Boiler When using extension pipes with the horizontal rear flue, a core drill size of 125mm should be used to allow the extension pieces to slope at 35mm/metre (2.5o) towards the boiler. IMPORTANT: With regards to the Manual Handling Operations, 1992 Regulations, the following lift operation exceeds the recommended weight for a one man lift.
8 Horizontal Top Flue Preparation and Fitting The standard horizontal flue is fitted onto the top of the boiler using the flue adaptor. 11971 WALL THICKNESS 'X' = 75 TO 527mm See diagrams 8.1 to 8.3 to determine whether a standard flue can be used. The standard flue can be extended using 1m long extension kits and 90° elbows to maximum equivalent length of 3.5m - Note: A 90° elbow equals 1m of flue.
8.2 Rear Flue (LIPS POINT INWARDS) Mark the air duct assembly and the flue duct at the lengths shown in diagram 8.4. FLUE ELBOW 12257 8 Horizontal Top Flue Preparation and Fitting Then cut to length, cutting square and removing any burrs. 8.3 Standard Side Flue Fit the flue spigot 'H', supplied with the boiler with the three securing screws to the top of the boiler.
8 Horizontal Top Flue Preparation and Fitting 8.5 Flue Assembly 8.6 Flue Attachment to Boiler, refer to Diagram 8.6. The flue assembly is an entirely push fit design. The lip seals should be fitted in the correct orientation into the flue elbow, see diagram 8.4. Make sure all joints are properly fitted, sealed and secured. Internal rear flue fitting. While the flue spigot 'H' is attached to the boiler, push the flue elbow 'G' into the adaptor. Pull air pipe 'B' and flue duct 'A' into the flue elbow.
ROOF TERMINAL Pt.No. 08510300 1M EXTENSION Pt.No. 08509900 VERTICAL FLUE ADAPTOR KIT Pt.No. A2024900 12208 8 Vertical Flue Preparation and Fitting 45° BEND Pt.No. 08510200 FLAT ROOF WEATHER COLLAR Pt.No. 08510700 90° BEND Pt.No. 08510100 PITCHED ROOF WEATHER COLLAR Pt.No. 08510500 400mm-500mm TELESCOPIC PIPE Pt.No. 08510000 8.7 Vertical Flue These instructions are for the installation of this vertical flue and its accessories only. Diagram 8.7 shows the Vertical Flue Adaptor kit and Accessories.
12196 8 Vertical Flue Preparation and Fitting 12192 FITTING FLAT ROOF FLASHING FITTING PITCHED ROOF FLASHING VERTICAL ROOF TERMINAL 565 TERMINAL 100 * FLAT ROOF FLASHING 1x90° or 2x45° ELBOWS 730 1 METRE EXTENSION 1 METRE EXTENSION * * PITCHED ROOF FLASHING Fit flat roof or pitched weather collar onto vertical roof terminal. Make sure a weather proof seal is made in accordance with good building practice.
TWIN FLUE ADAPTOR KIT Pt.No.A2025000 1M EXTENSION Pt.No.08547800 (Aluminium) TWIN PIPE TO CONCENTRIC ADAPTOR Pt.No.08511800 PITCHED ROOF WEATHER COLLAR Pt.No.08510500 FLAT ROOF WEATHER COLLAR Pt.No.08510700 SINGLE PIPE TO TERMINAL ADAPTOR Pt.No.08511900 12209 8 Twin Flue Preparation and Fitting 0.5M EXTENSION Pt.No.08547600 (Aluminium) 0.5M EXTENSION AIR DUCT Pt.No.08547200 (Plastic) 45° BEND Pt.No.08538800 HORIZONTAL FLUE TERMINALS Pt.No.08511500 FIXING BRACKET VERTICAL Pt.No.
FLUE CONFIGURATION EXAMPLE INCLUDING DIMENSIONS TO AID CUTTING AND INSTALLATION AIR DUCT 45°ELBOW TERMINAL 50 50 50 12198 8 Twin Flue Preparation and Fitting 1000 92 900 92 1 METRE EXTENSION 40 50 FLUE DUCT TERMINAL 1 METRE EXTENSION 1 METRE EXTENSION 90°ELBOW TWIN FLUE ADAPTOR Diagram 8.11 12199 TWIN FLUE ADAPTOR An Example Twin Flue Installation. (The flue assembly is an entirely push fit design), see diagram 8.11. Fitting Twin Flue Adaptor, see diagram 8.12.
90°ELBOW 12203 8 Twin Flue Preparation and Fitting SEALING COLLARS 1 METRE EXTENSION (cut to fit) 90°ELBOW AIR DUCT TERMINAL SEALING COLLARS FLUE DUCT TERMINAL 11742 Diagram 8.13 1 METRE EXTENSION CONCENTRIC ADAPTOR INTERNAL SEALING COLLAR CONCENTRIC HORIZONTAL TERMINAL EXTERNAL SEALING COLLAR Diagram 8.
12204 11743 8 Twin Flue Preparation and Fitting FLAT ROOF FLASHING VERTICAL ROOF TERMINAL 565 100 VERTICAL ROOF TERMINAL After installation the vertical roof terminal must be secured with a fixing bracket SINGLE CONCENTRIC PIPE ADAPTOR ADAPTOR 730 Fit flat roof or pitched weather collar onto vertical roof terminal. Make sure a weather proof seal is made in accordance with good building practice.
9 Gas/Water Connections These packs are for the (F24e & F28e ONLY) Packs supplied with the boiler 4. Pipe pack containing Central heating pipe (2 off) Domestic water pipe (2 off) Gas pipe (1 off) 1/2 in. gasket (3 off) b 3/4 in. gasket (2 off) c 1. Isolating valve pack containing Heating isolating valves (2 off) Domestic cold water isolating valves (1 off) Domestic hot water elbow (1 off) Gas isolating valve (1 off) 2.
9 Gas/Water Connections ISOLATING VALVE 9172 ON/OFF LEVER GAS ISOLATING VALVE ALL VALVES SHOWN IN CLOSED POSITION (F24E & F28e ONLY) DOMESTIC COLD WATER INLET ISOLATING VALVE (F24E & F28e ONLY) TAP EXTENSION KNOBS (a) and (b) (b) (a) 12177 (F24E & F28e ONLY) DOMESTIC HOT WATER OUT ELBOW CENTRAL HEATING FLOW AND RETURN ISOLATING VALVES ISOLATING VALVE CENTRAL HEATING FLOW ISOLATING VALVE SAFETY VALVE DISCHARGE PIPE GAS ISOLATING VALVE DRAIN POINT DOMESTIC COLD WATER SUPPLY ISOLATING VALVE (F24E
9 Gas/Water Connections These packs are for the (F28e SB ONLY) 4. Pipe pack containing Central heating pipe (2 off) Domestic water pipe (2 off) (F28e ONLY) Gas pipe (1 off) 1/2 in. gasket (3 off) b 3/4 in. gasket (2 off) c Packs supplied with the boiler 1. Isolating valve pack containing Heating isolating valves (2 off) Gas isolating valve (1 off) 2. Safety discharge pipe pack containing Safety discharge valve pipe (1 off) 15mm seal washer (1 off) Tubing nut (1 off) 3.
10 Safety Discharge Valve and Condensate Connections 10.1 Safety Discharge Valve A short discharge pipe with nut and washer are supplied in a pack at the bottom of the boiler packaging. Connect the discharge tube to the heating safety valve. This must be extended, using not less than 15mm o.d. pipe, to discharge, in a visible position, outside the building, facing downwards, preferably over a drain, see diagram 10.1.
INTERNAL SOIL AND VENT STACK 12333 10 Safety Discharge Valve and Condensate Connections EXTERNAL SOIL AND VENT STACK BOILER BOILER EXTERNAL MAX. 3M MIN. DIA. 21MM NO RESTRICTION ON LENGTH MIN. DIA. 21MM NO RESTRICTION ON LENGTH Internal Soil and Vent Pipe External Soil and Vent Pipe or Rainwater Pipe BOILER SINK (CONSTITUTES AIR BREAK) EXTERNAL LENGTH OF PIPE 3M MAX. * BOILER MIN. DIA. 21MM OPEN END OF PIPE DIRECT INTO GULLEY BELOW GROUND BUT ABOVE WATER LEVEL MIN. DIA.
11 Electrical Connections WARNING: This appliance must be earthed. This appliance must be wired in accordance with these instructions. Any fault arising from incorrect wiring cannot be put right under the terms of the Saunier Duval guarantee. Lower the control panel. This boiler will operate continuously on heating as supplied, if the wire link (E), fitted between the two terminals of the heating controls connection, is left in place, see diagram 11.1. All system components must be of an approved type.
11 Electrical Connections 11627 Route the external controls cable through to the rear of the control panel where the other cables exit. External controls should be fitted in accordance with the rules in force. Refer to Section 15 wiring diagram. 11.3 Electrical Connections - Testing Carry out preliminary electrical system checks as below: 1. Test insulation resistance to earth of mains cables. 2. Test the earth continuity and short circuit of cables. RETAINING LATCHES 11987 3.
12 Commissioning 3 The commissioning and first firing of the boiler must only be done by a competent person. Undo cap on automatic air vent on top of boiler and leave undone. 12217 Please ensure the "Benchmark" logbook is completed and left with the user. Do not operate the boiler without water. 12.
12 Commissioning 12.3 Initial Lighting 12.5 Instruct the User - Adjust heating temperature to maximum, refer to User Controls and Lighting. Instruct and demonstrate the lighting procedure and advise the user on the safe and efficient operation of the boiler. - Check that any system controls, if fitted, are calling for heat (set room thermostat to maximum). Instruct on and demonstrate the operation of any heating system controls.
13 Servicing 13.1 General RETAINING LUGS Measurement of the products of combustion can be achieved by connection of a probe to the flue elbow or alternatively to the sample point at the base of the flue outlet pipe inside the boiler, see diagram 13.2. To gain access remove the front casing and inner casing panels, see diagram 13.1. FRONT CASING PANEL To remove the front casing panel remove the two securing screws and lift off the panel from two retaining lugs, see diagram 13.1.
13 Servicing 12185 13.3 Burner and Fan Refer to diagram 13.4. Remove spark electrode lead, heating flow thermistor electrical connections and electrical connections to the fan and gas valve. HEATING FLOW ELECTRICAL CONNECTIONS Remove gas pipe securing clip. SECURING PLATE SCREW (Slacken pull forwards to remove) SPARK ELECTRODE LEAD While supporting the gas valve, fan and silencer assembly, slacken the fan securing plate screw enough to withdraw the securing plate.
13.5 Condensate Drain FIXING BRACKET Refer to diagram 13.5 and 13.6. 12178 13 Servicing Remove condensate drain pipe. Slide fixing bracket forward and remove, ease condensate drain down off the inlet connection. CONDENSATE DRAIN Carefully remove the condense drain taking care not to spill any water which may be in the unit. As the unit is lifted remove the flexible connection on the outlet. Remove the cap at the base of the condense trap. Remove any solids found. Remove the strainer and clean.
13 Servicing Adjustment of the CO2 at minimum rate is very coarse so carefully adjust the CO2 with the offset adjustment to 8.3%, see diagram 13.9. 12265 OFFSET ADJUSTMENT Rotate the service potentiometer fully clockwise, see diagram 13.8 and recheck the maximum rate combustion, which should be 9.3% ± 0.2%. After checking combustion rotate the service potentiometer fully anti-clockwise so that the display indicates the water temperature.
13 Servicing 12194 13.9 Draining of Boiler Heating Circuit Drain down the Heating Circuit of the boiler only, by closing the heating flow and return isolating valves, see diagram 9.2. Refer to diagram 13.12. Attach a length of hose to the drain point and open the drain valve. After servicing or replacing parts, close the drain valve and remove the hose. Open the heating flow and return isolating valves and refill, vent and pressurise the heating circuit. See relevant parts of section 12. Check for leaks.
14 Fault Finding When trying to operate the boiler make sure that : WARNING: Always isolate the boiler from the electrical supply before carrying out any electrical replacement work. - All gas supply cocks are open and that the gas supply has been purged of air. Always check for gas soundness after any service work. Should there be any doubt about the voltage supply to any of the components, it is possible to carry out a simple electrical test to ensure all is operational in that area.
14 Fault Finding To carry out the electrical test, gain access to the Control Box PCB, as follows: Hinge down the control box. Remove Torx screws and unhook the rear panel. For layout of PCB, see (F24e / F28e) diagram 15.1 or (F28e SB) diagram 15.1a 11988 To check components see (F24e / F28e) Table 1 or (F28e SB) Table 1a . (F28e SB ONLY) Diagram 14.
14 Fault Finding (F24e / F28e ONLY) Table 1. (F28e SB ONLY) Table 1a. COMPONENT C.H. thermistor Fan 10K Ω @ 25°C 24V DC accross terminals on fan, 40V dc in standby mode, see diagram 14.2. Check 3.15 AT fuse on DC fan supply. OVERHEAT RESET BUTTON 12216 24VDC/55 Ω 12195 Gas Valve OVERHEAT THERMISTOR TERMINALS Diagram 14.2 Diagram 14.3 14.1 Overheat Thermistor reset button, see diagram 14.3. Positioned at the rear left under the fan.
12410 14 Fault Finding Diagram 14.
11919a 15 Wiring Diagram MAINS VOLTAGE HEATING CONTROLS PLUG REMOVE VOLTAGE FREE LINK 230V SWITCHED LIVE FROM OPTIONAL FROST STAT. 230V SWITCHED LIVE FROM HEATING CONTROLS. VOLTAGE FREE HEATING CONTROLS PLUG LINK REMOVE THE LINK IF FITTING VOLTAGE FREE OR 230V SYSTEM CONTROLS. IF THE LINK IS NOT REMOVED THE BOILER WILL RUN CONTINUOUSLY. (F24E & F28e ONLY) 2000225294A Diagram 15.
12240 15 Wiring Diagram (F28e SB ONLY) Diagram 15.
16 Replacement of Parts 16.1 General 16.5 Transformer Replacement of parts must be carried out by a competent person. For access, refer to section 16.1. Refer to diagram 16.2. Before replacing any parts the boiler should be isolated from the mains electric supply and the gas should be turned off at the gas isolation valve on the boiler, see diagram 9.2. Unplug electrical connection from the transformer. Drop down control panel and undo the three screws securing rear cover and lift up, see diagram 11.1.
16 Replacement of Parts 12265 16.6 Gas Control Valve For access, refer to section 16.1. Refer to section 13.3 for removal of the fan/gas control valve and silencer assembly. SECURING SCREW (3) Remove the gas control valve and plate which is held by the three plate securing screws, see diagram 16.4. After replacing the gas control valve the combustion CO2 will need to be checked and adjusted if necessary. See section 13.6. GAS CONTROL VALVE 16.7 Fan and Silencer For access, refer to section 16.1.
16 Replacement of Parts 16.9 (F24e/F28e ONLY) Plate to Plate Heat Exchanger 16.10 Pump (head only) Drain the heating circuit, see section 13.9. Drain the boiler heating circuit, see section 13.9. Drain the hot water circuit, see section 13.10. Make sure that the filling loop valves are closed, then proceed as Section 16.19 (F24e or F28e only). For access, refer to section 16.1. Release Rhd. side panel to gain increased access. Refer to diagram 16.7.
16 Replacement of Parts 16.11 Expansion Vessel (F24e/F28e ONLY) 16.11a Expansion Vessel (F28e SB ONLY) For access and to hinge Rhd. side panel, refer to section 16.1. For access and to hinge R/H side panel, refer to section 16.1. Drain the boiler heating circuit, see section 13.9. Drain the boiler heating circuit, see section 13.9. Drain the boiler hot water circuit, see section 13.10. Refer to diagram 16.8a. Remove Plate to Plate heat exchanger, refer to section 16.9.
16.12 Safety Discharge Valve SAFETY DISCHARGE VALVE For access, refer to section 16.1. Drain down the heating circuit, see section 13.9. SECURING CLIP 12214 16 Replacement of Parts Refer to section 13.9 and drain the boiler heating circuit. Refer to diagram 16.9 Undo the safety discharge valve coupling and remove from the pipework. Remove the securing clip and withdraw the safety discharge valve. Fit new 'O' ring. Refill, vent and pressurise the boiler. Check for leaks. 16.
16 Replacement of Parts 12222 16.15 (F24e/F28e ONLY) Central Heating Return Thermistor For access, refer to section 16.1. Refer to diagram 16.12. Remove the electrical connections from the thermistor. Remove the thermistor and retaining clip from the flow pipe. Fit the replacement thermistor using the heat sink compound supplied. Note: When reconnecting, the polarity of the wiring to thermistors is unimportant. 16.15a (F28e SB ONLY) Central Heating Return Thermistor For access, refer to section 16.1.
16.18 (F24e/F28e ONLY) Flow Sensor AIR VENT For access, refer to section 16.1. 12217 16 Replacement of Parts Refer to section 13.10 and drain the boiler hot water circuit. Refer to diagram 16.15. Remove the electrical connection to the flow sensor. Remove the securing clip between the flow sensor and the plate to plate heat exchanger. Undo the coupling to the cold water inlet pipe. Remove flow sensor. Remove flow restrictor and fit to replacement. Fit new 'O' rings.
16 Replacement of Parts 12193 16.21 (F24e/F28e ONLY) Three Way Valve Refer to sections 13.9 and 13.10. ELECTRICAL CONNECTIONS Remove the Reduced Pressure Zone Valve Refer to Section 16.19. Remove the electrical connection from the three way valve, see diagram 16.7. Remove the pipe assembly from between the cold water inlet isolation valve to cold water filter housing, see diagram 13.10.
16.25 Condense Drain 12228 16 Replacement of Parts RETAINING LATCHES For access, refer to section 16.1. Refer to section 13.5. 16.26 Access to Switches, User Interface and Programmer For access, refer to section 16.1. Release the front of the fascia by carefully unclipping the two retaining latches, see diagram 16.19. Do not allow the front of the fascia to swing down and be loosely held by the electrical connections. Either remove the connections or support the fascia. 16.
16.32 Control Box For access, refer to section 16.1. SECURING SCREWS (2) Remove relevant plugs and connectors, refer to wiring diagrams section 15. 12229 16 Replacement of Parts THREE WAY VALVE PCB (F24e/F28e ONLY) Withdraw grommets and leads so they are hanging loose. Unthread the retaining cord and remove the control box by drawing it outwards away from its retaining slots, see relevant part of diagram 11.1. 16.
16 Replacement of Parts 12267 16.35 Heat Exchanger Refer to section 16.1. Drain the boiler heating circuit, see section 13.9. Drain the boiler hot water circuit, see section 13.10. Remove the flue elbow, water and gas connections at the bottom of the boiler, any electrical connections. Lift the boiler up and off the hanging bracket, carefully lay the boiler on its back on the floor.
17 Spare Parts When ordering spare parts, contact Saunier Duval service organisation using the telephone number on the inside front cover of this booklet. Please quote the name of the appliance and serial number, to be found on the data label. If ordering from British Gas also quote the G.C. number of the part. Key No. Part No. Description GC Part No.
1 11922 17 Spare Parts 2 3 4 5 7 8 6 9 13 10 15 11 and 11a 12 14 17 16 18 19 20 Diagram 17.1 Because of our constant endeavour for improvement, details may vary slightly from those shown in these instructions.
