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Keston C25 Installation Manual

1. Y A NUT Of 08 4 00 04 9 Installation amp Servicing Instructions Page 33 WD209 1 2000 eici 5 Fault Finding The Keston Celsius 25 amp 25P 5 7 2 Waterway Condensate amp Flue Assembly AIRING HOSE 02 C 08 2 48 00 1 Installation 8 Servicing Instructions Page 34 WD209 1 2000 Chapter 5 Fault Finding The Keston Celsius 25 amp 25P 5 7 3 Air Gas Ass
2. 42 Ignitor Gasket 31 Ignitor Sensor Probe 47 Flow Return 46 Flue Protection Thermistors Thermostat J fo Ne A KI RK NS y lt 121 Flow Overheat 80 KC25 Gas Valve Thermostat KC25P Gas Valve Installation amp Servicing Instructions Page 47 WD209 1 2000 Chapter 8 Spare Parts Listings The Keston Celsius 25 amp 25P Item GC No Part Denomination item GC No Part Denomination 100 Ignition PCB 99 Control PCB 98 Fascia PCB Installation amp Servicing Instructions Page 46 WD209 1 2000 as 8 Spare Parts Listings The Keston Celsius 25 amp 25P SHORT SPARE PARTS LIST FOR THE KESTON CONDENSING BOILER RANGE Part Denomination Flow Return Temperature Thermistor Water Pressure Switch Flow Overheat Thermostat Flue Protection Thermostat Control PCB Ingition PCB Fascia PCB Transformer Combustion Blower KC25 Gas Valve NG KC25P Gas Valve LPG Condensate Trap Ignition Electrode Burner Heat Exchanger Circulating Pump Installation amp Servicing Instructions Page 47 WD209 1 2000 Chapter 9 Benchmark Checklist Final The Keston Celsius 25 8 25P 9 GAS BOILER COMMISSIONING CHECKLIST BENCHMARK No A Genchmar GAS BOILER COMMISSIONING CHECKLIST BOILER SERIAL No NOTIFICATION No CONTROLS To comply with the Building Regulation each s
3. Clearances From Wall Flue outlet and air inlet terminations must be at least 40 mm from the wall face Distance Between Flue Outlet amp Air Inlet There is no maximum the terminations must not be on opposite sides of the dwelling but can be in areas of unequal pressure A minimum clearance of at least 200 mm must be left between the terminations General Installations All parts of the system must be constructed in accordance with BS 5440 Part 1 except where specifically mentioned in these instructions All pipe work must be adequately supported All joints other than push on or plastic compression connectors must be made and sealed with solvent cement suitable for muPVC pipes and conforming to BS 6209 1982 External wall faces and any internal faces of cavity walls must be made good Rubber collars are available for flue and air terminals to finish the external wall face around the terminals Part No C 08 0 00 07 0 AIR SUPPLY The Celsius 25 is a room sealed appliance and therefore does not require purpose provided ventilation to the boiler room for combustion air Installation amp Servicing Instructions Page 13 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 amp 25P 2 10 COMPARTMENT INSTALLATION Due consideration should be given to BS5440 pt 1 with regard to compartment ventilation requirements High and low level ventilation is required for cooling purposes as follows Position o
4. Chapter 2 Boiler Connections The Keston Celsius 25 8 25P AA AAA A y Dimensions mm Flue Air Terminal Inlet A Below or beside openable window air brick 300 50 etc B Below gutters soil pipes drain pipes 75 75 C Below eaves 200 50 D Below balconies or car port roof 200 50 E From vertical drain or soil pipes 75 50 F From internal or external corner 200 50 G Above ground or balcony or roof 200 100 H From surface facing a terminal 600 100 From terminal facing a terminal 1 200 1 200 J From opening in a car port 1 200 100 K Vertically from terminal on same wall 1 500 1 500 L Horizontally from terminal on same wall 300 300 Table 2 8 4 Minimum Flue Terminations amp Air Inlet Dimensions The flue outlet terminal is designed to face outwards but can if desired be adapted to face in any direction BUT must not be directed in the region of the air inlet The two terminals are subject to the requirements of BS 5440 Pt 1 for clearances from features of the building although some can be decreased to the values indicated The Keston Celsius 25 as with any condensing boiler will generate a condensate plume from the flue terminal in all weather conditions Consideration must therefore be given to the effect of this plume when selecting a location for the flue terminal It is advisable for horizontal flue terminals to place a 45 elbow at the end of the flue to direct the condensate plume up and away from the property
5. 1 The fan will start 2 When the fan reaches ignition running speed will start the ignition sequence 3 After a pre purge period of about 10 seconds the yellow burner on LED will flash the gas valve will open to allow gas to mix with the air at the suction side of the fan and the ignition spark will occur at the main burner 4 When the burner ignites the flame is detected by the ignition pcb through the combined flame sensor ignitor and the ignition spark is stopped The boiler on yellow LED will change to be continuously illuminated and the four modulation green LED s will indicate the boiler power level The boiler is now in its normal run condition 5 The boiler will automatically and continuously adjust its power output and pump speed to best match the demands of the system at any time In the event the boilers integral pump cannot maintain sufficient boiler water flow to disperse the heat generated the red pump LED will flash slowly 1Hz If this occurs any system restriction should be cleared If this persists due to an abnormally high system resistance consideration should be given to an additional system pump In the event the boilers integral pump cannot reduce the water circulation to ensure the most efficient transfer of heat to the system water the red pump LED will flash rapidly 5Hz If this occurs consideration should be given to regulating valves on the system to restrict system flow rates 6 The burner will
6. Md 32 Page x E DEl JOAO FSUDAL Yajms asa apo daa a AG sadim rod aa pay vaa asni vwal par aauanq pa samod K JOPUOD S 1BUAOFSUDAZ SSeS eS pal y uololnpou JOpUOD S 4sausossuouy c 03 TUDO mpou SN Sis esse NINININTAO g 237 2 uoponpou Nir Q WOK E w 3 d OWAd o pay aaa dund ponlo var N J 103 vos c NI 250333 OU 40 nati 7 Chapter 5 Fault Findin 4045 d Jajom o 105 HO 329442 NOY 403 4035 amy auods o 3035 augo 6NI ILLUSTRATED WIRING DIAGRAM uoj 1025 U43yY3 moji WD209 1 2000 5 6 Installation amp Servicing Instructions WD209 1 2000 Chapter 5 Fault Finding The Keston Celsius 25 amp 25P 5 7 Exploded Assembly Diagrams 5 7 1 Boiler Controls Assembly
7. ANY ADJUSTMENT SCREW 9 After the high then low fire adjustment has been made then the boiler must be returned to modulation operation Isolate the electrical supply verify safe isolation and remove the fan speed jumper Restore the electrical supply to the boiler and then turn the boiler on and off using the fascia control knob until there are no lower LEDs illuminated Isolate the electrical supply verify safe isolation and refit the jumper to the board refit boiler fascia and case Restore the electrical supply to the boiler and hand over to the user If following the above procedure combustion levels described above at both high and low rate could not be obtained please turn off the appliance and isolate the gas to the appliance Telephone KESTON BOILERS technical support phone no 0208 462 0262 3 3
8. Bye Laws of the local Water Undertaking In addition due account must be taken to the following Codes Of Practice BS 6891 Gas Supplies BS 6798 Installation Central Heating Boilers BS 5449 Installation Pumped Central Heating BS 5546 Installation Domestic Hot Water BS 5440 1 Flues BS 5440 2 Air Supply BS 7074 1 E Expansion Vessels Installation 8 Servicing Instructions Page 2 WD209 1 2 h ri neral Instruction BS 7593 Systems The K n Isius 25 amp 25P Treatment of Water in Hot Water Central Heating For Timber Framed Buildings British Gas Publications DM2 Also British Gas Publications Guidance Notes For The Installation Of Domestic Gas Condensing Boilers and Specification For Domestic Wet Central Heating Systems 1 4 PERFORMANCE DATA Flue and Air Intake Material Max Input Gross CV kW Btu h Max Output To Water 80 60C Flow Return kW Btu h 50 30C Flow Return kW Btu h Min Output To Water 80 60 C Flow Return kW Btu h 50 30C Flow Return kW Btu h Max Burner Press Hot Factory Preset mbar in w g Gas Consumption After 10 mins l s Ft hr Max Operating Flow Temp C Max Head Open Systems m ft Max Press Sealed System Bar Min Head Open Systems m Inlet Gas Pressure mbar in w g Recommended Temp Diffl C Electrical Supply Power Consumption Max W Cabinet Height mm Cabinet Width mm Cabinet Depth mm Top Clearance mm Side Clearance mm Base Clea
9. CHECKING THE GAS PRESSURE With the boiler running measure the burner pressure at the burner pressure test nipple pos 5 NB It is advisable to carry out this test with the user control knob turned to maximum and the system water cold to ensure the boiler is running at maximum rate The gas setting is factory adjusted to within the required range and should not need adjustment If the reading is incorrect then check such factors as soundness of the air and flue pipe joints and the gas inlet pressure pos 3 minimum 18 mbar required for natural gas minimum 31 mbar required for LP gas If all joints are sound and the gas inlet pressure is satisfactory check the gas input by timing the gas meter as detail in Section 4 8 Timing The Gas Meter If the gas input cannot be measured then it s compulsory to measure the combustion quality as detail in Section 4 9 Combustion Testing TIMING THE GAS METER NATURAL GAS After the boiler has been started and with no other appliances using gas time the gas meter to be certain that the unit is running at the proper gas input Determine the cubic feet of gas passing through the meter and determine the input in Btu per hour Input must be within plus or minus 5 of the rated input Time in seconds the time taken to pass 2 cubic feet of gas through the meter ie one revolution of a 2 cu ft dial or 0 1 cubic metres if the meter is of the new metric digital type Installation am
10. Description Ignition PCB C 08 4 04 00 3 Control PCB C 08 4 03 00 6 Fascia PCB C 08 4 02 00 0 Electrical Terminal Block C 08 4 08 00 0 Cabinet Stat C 08 4 21 00 0 5 7 2 Description Heat Exchanger C 08 2 18 00 0 Burner C 08 2 32 00 0 Burner Head Gasket C 08 2 00 07 0 Ignitor Gasket C 08 2 00 06 0 A Spark Ignition Electrode C 08 2 01 00 3 Condensate Trap C 08 2 14 00 0 Flow Return Thermistor C 08 2 08 00 0 Flue Overheat Stat C 08 2 30 00 0 Flow Overheat Stat C 08 2 07 00 0 Water Pressure Switch C 08 2 23 00 0 Water Pump C 08 2 11 00 0 Description Combustion Blower C 08 3 01 00 1 KC25 Gas Valve C 08 3 02 00 1 KC25P Gas Valve C 08 3 20 00 0 Mixing Venturi C 08 3 03 00 0 Description Cabinet C 08 1 04 00 0 Data Badge C 08 1 00 01 0 NG Data Badge C 08 1 00 35 0 LPG III Wiring Diagram C 08 1 00 13 0 Combustion Test Plug B 04 2 00 49 1 Installation amp Servicing Instructions Page 37 WD209 1 2000 s 6 Servicing The Keston Celsius 25 amp 25P 6 ROUTINE ANNUAL SERVICING To ensure the continued safe and efficient operation of the boiler it is necessary to carry out routine servicing at regular intervals The frequency of the servicing will depend upon the particular operating conditions but it is recommended that an annual service should be carried out by a qualified engineer It is the law that any service work must be carried out by competent qualifie
11. Reset boiler by turning use control knob off then on Does fault clear Installation amp Servicing Instructions Replace flow thermistor Wiring betw een flow Y thermistor and control PCB faulty Is modulation LED2 illuminated ls the return thermisto open circuit Replace return thermistor Is there open circuit across return thermistor connections on control PCB Q iring betw een return thermistor and control PCB faulty Replace control PCB Is the water pressure Replace w ater pressure switch open circuit switch ls there open circuit across water pressure switch connections on control PCB J iring betw een w ate pressure switch and control PCB faulty Replace control PCB Page 26 WD209 1 2000 Chapter 5 Fault Finding The Keston Celsius 25 8 25P 53 Fault Finding Flow Chart Detailed MAINS LED OFF Is the boiler supply fuse OK Is there 230VAC at PL connection at main connection block K Is there 230VAC at mains input connection to control PCB L Is there 230VAC at control PCB transformer mains input M Is there 24VAC at control PCB transformer connection N Is control PCB fuse F2 OK O Is wiring from control PCB to fascia PCB OK P Does boiler produce heat Replace fascia PCB Replace with 3A Fuse No mains supply to boiler Wiring from connection block to control PCB faulty Replace control PCB Replace Transf
12. items 112 and pull forward leaving to one side iv Remove the right hand side panel to the control boards housing by sliding forward iv Pull off the multi pin connectors away from the board v Slide the control PCB from the PCB housing vi Reassemble Section 7 3 7 4 8 Combustion Blower Fig 5 7 3 item 78 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 ili Disconnect the connector block from the combustion blower iv Unscrew the bolts securing the venturi elbow fig 5 7 3 item 82 to the inlet port of the combustion blower v Remove the four bolts securing the combustion blower outlet flange to the burner and remove the combustion blower vi Reassemble Section 7 3 NB When reassembling inspect any gaskets for damage and replace if necessary 7 4 9 Gas Control Valve Fig 5 7 3 item 80 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 ili Remove the push on connector block to the gas valve iv Remove the plastic air tube to the base of the gas valve v Undo the union fitting Fig 5 7 3 item 89 securing the gas inlet pipe to the gas control valve Installation amp Servicing Instructions Page 42 WD209 1 2000 eieiei 7 Replacement Of Parts The Keston Celsius 25 amp 25P vi Undo the four bolts fixing the mixing venturi fig 5 7 3 item 81 to the venturi elbow fig 5 7 3 item 82 vii Remove the gas valve and mixing venturi as one viii Separate the mi
13. Servicing Instructions Page 3 WD209 1 2000 Chapter 1 General Instruction The Keston Celsius 25 amp 25P ee Seasonal Efficiency SEDBUK 90 4 Celsius 25 and 93 3 Celsius 25P This value is used in the UK Government s Standard Assessment Procedure SAP for energy rating of dwellings The test data from which it has been calculated have been certified by Advantica Technologies Ltd Keston Boilers Ltd declare that there are no substances harmful to health within the appliance or used during the production of the appliance The Celsius 25 is intended for domestic and commercial EMC environments and on a governed G20 meter supply The Celsius 25P is intended for domestic and commercial EMC environments and on a governed G31 supply IMPORTANT This product contains ceramic fibre boards which although not regarded as a risk contain ceramic fibre which may cause temporary irritation to eyes skin and respiratory tract The fibres are held in place by inorganic binders Therefore as long as the boards are not disturbed they will not be released Since the boards are non servicable parts there should be no risk To ensure that the release of fibres from these RCF articles is kept to a minimum during installation and servicing we recommend that you use a HEPA filtered vacuum to remove any dust accumulated in and around the appliance before and after working on the appli ance When replacing these articles we recommend that the re
14. Servicing Instructions Page 14 WD209 1 2000 Chapter 3 Installation The Keston Celsius 25 amp 25P 3 INSTALLATION OF THE BOILER Read Chapter 2 Boiler Location and decide upon the position of the boiler Installation of the boiler is straightforward but consideration must be given to access to allow flue and air pipes to be pushed through walls and ceilings The order in which the components are installed will depend upon particular site conditions but in general it will be easiest and most accurate to install the boiler and then build up the flue outlet and air inlet pipes to the terminal this is the sequence described 3 1 WALL MOUNTING BRACKET a Place the bracket on All dimensions in mm the wall horizontally with the pre drilled holes at the bottom 191 and position as dictated by the template supplied within the boiler packaging b Drill through the centre hole of the bracket plug the hole and fix in position Cc Using a spirit level make sure the bracket is completely level and mark the position of the other screw holes d Remove the bracket and drill the holes in s af the positions marked Figure 3 1 Wall Mounting Fixing Locations Plug these holes e Screw the bracket to the wall using screws of an appropriate size for the wall type No 12 x 2 inch wood screws normally suffice 3 2 MOUNTING THE BOILER a Lift and locate the boiler in the studs protruding from the wall bracket b Fix the
15. by unplugging the 13 way connection block vi Reassemble Section 7 3 vii Check for correct operation of the fascia PCB 7 4 2 Boiler Flow and Return Thermistors Fig 5 7 2 item 47 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Remove the push on connectors from the thermistor taking note of the correct positions iv Unscrew the two retaining screws and remove the thermistor v Reassemble Section 7 3 NB When fitting the new thermistor it is an advantage to smear a thin film of heat sink compound between the thermistor and plate This combined with fitting the new thermistor tightly to the plate ensures a good contact 7 4 3 Cabinet Temperature Sensor Fig 5 7 1 item 106 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Remove the cabinet temperature sensor from the connector block by slackening the retaining screws iv Reassemble Section 7 3 7 4 4 Flow Overheat Thermostat Fig 5 7 2 item 121 amp Flue Protection Thermostat Fig 5 7 2 item 46 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 Installation amp Servicing Instructions Page 41 WD209 1 2000 Siendi 7 Replacement Of Parts The Keston Celsius 25 amp 25P iii Remove the push on connectors from the thermostat taking note of the correct positions iv Unscrew the two retaining screws or nuts and remove the thermostat v Reassemble Section 7 3 NB When fitting the
16. continue to operate until the gas valve interrupts the gas supply The gas valve will be closed by the control pcb if power is interrupted to the boiler by any external control or the boiler thermostat If an interruption to the gas supply causes loss of the flame the control box will pause for approximately 10 seconds and then attempt to re ignite the unit If this attempt fails i e due to continued lack of gas supply the boiler will make four further attempts to ignite at intervals of approximately 10 seconds and will then go to a lockout state red lockout LED flashing twice every two seconds Once the gas supply has been resumed the boiler can be reset by turning the boiler off and then on again on the user control knob 7 The boiler can also be shut down by any of the flow overheat cabinet temperature sensor and flue overheat thermostats In such an event the yellow boiler on LED will be extinguished and the red lockout LED will flash once every 2 seconds The precise safety sensor activated will be indicated by the appropriate green modulation LED being illuminated as detailed below Modulation LED 1 Flow Overheat Thermostat Modulation LED 2 Cabinet Temperature Sensor Modulation LED 3 Flue Overheat Thermostat In the event the system water pressure drops below 0 2 bar the low water pressure switch will shut down the boiler In such circumstances the yellow boiler on LED will be extinguished and the red lockout LED will flash three
17. existing boiler add Fernox Supafloc or equivalent cleaning agent in accordance with the manufacturers instructions Open all radiator valves and fire the boiler When the system is fully heated shut off the gas supply and drain down the central heating system Important The Celsius 25 condensing boiler contains components which could be damaged or blocked by grease dirt or solder etc It is essential that sludge or scale is removed from an existing system The guarantee provided with the Keston Celsius 25 does not cover damage caused by system debris or sludge Connect the new boiler as instructed in this manual and fit in accordance with Sections 3 1 to 3 8 For sealed systems fill to a pressure of about 2 7 bar Check the complete system for water soundness If leaks need to be rectified using flux or solder the system must be flushed cold again before proceeding Reduce the pressure to the Initial System Design Pressure for sealed systems if applicable Vent the system Gas Supply The complete gas installation up to the boiler service cock must be checked for soundness BS 6891 Electrical Installation Carry out preliminary electrical safety checks i e Earth continuity Polarity Resistance to Earth Short Circuit using a suitable test meter Initial Firing The gas pressure setting is factory adjusted to within the required range and does not need re adjustment If the reading is incorrect then check such factors as soundness
18. metre run downwards towards the boiler Pipework can be vertical Only swept elbows can be used Air inlet pipework can be truly horizontal or vertical or sloping in a downward direction towards the boiler but in this case rain etc must be prevented from entering the pipe There must be no troughs in any of the pipework whether it be air inlet or flue outlet Figure 2 8 3 Flue Condensate Drain Point Example To Terminal To Boiler Tee Fitting Due the low temperature of the flue gases further condensate will form RN within the flue system Drain points 6 in min with suitable traps must therefore be W i incorporated within the flue system at the base of vertical flue sections in excess of 8m for 50mm muPVC pipe flue systems These additional condensate drains must be run to discharge as detailed in section 2 11 Such drain points can be formed using standard muPVC fittings Refer to the example in Figure 2 8 3 2 8 4 Terminations Air inlet terminals must be facing horizontally or downwards to prevent entry of rain into the terminal and positioned to ensure only fresh air is drawn into the boiler The air terminal must be located outside of the building Drawing of combustion air directly from a ventilated boiler room invalidates the heat exchanger warranty Installation amp Servicing Instructions Page 12 WD209 1 2000 2 8 5 2 8 6 2 8 7 2 9
19. of the air and flue pipe joints pressure sensible joints and the gas inlet pressure minimum 18 mbar required for Natural Gas and 31 mbar required for LP gas If all joints are sound and the gas inlet pressure is satisfactory set the gas pressure and check the gas input Full details of this procedure are given in Section 4 8 Timing The Gas Meter Combustion Testing It is advisable on all installations that the combustion quality is checked by measuring the carbon dioxide CO2 or oxygen O2 level This procedure is detailed in Section 4 9 Combustion Testing Badly tuned combustion will lead to reduce the life of the boiler and invalidate the warranty Installation amp Servicing Instructions Page 18 WD209 1 2 h r 4 Commissionin The K n Celsius 2 25P 4 COMMISSIONING OF THE BOILER Important This condensing boiler contains components which could be damaged or blocked by grease dirt solder etc from the water system The following commissioning procedures must be followed precisely It is essential that combustion is checked at high and low rate as per Section 5 7 using a calibrated flue gas analyser set for the relevant gas type 4 1 INITIAL FLUSHING All waterways within the Keston Celsius 25 are either copper high alloy stainless steel or aluminium As a result water treatment chemicals for central heating boilers such as Fernox MB1 or equivalent are suitable In any event reference must be made to BS 7593 Treatmen
20. rate If CO levels above these values are experienced the combustion chamber and flue system should be investigated 1 3 WD485 0 2008 The procedure below details this setting using an electronic means of locking the boiler on high or low fire rate Where the instruction requires that the electrical supply to the appliance is isolated correct isolation procedures shall be followed Always verify safe electrical isolation before working on an appliance 1 Electrically isolate the appliance verify that the electrical supply has been isolated then remove the appliance case by first removing the securing screws at the top and bottom of the appliance 2 Once the casing has been removed keeping your hands away from exposed electrical components and connections switch the electrial power supply to the appliance back on Prior to commencing the adjustment procedure the boiler should be brought up to the normal working temperature a gas working pressure of at least 18mbar should be present at the gas inlet test nipple see Figure 1 and the thin neoprene plastic pipe between the venturi and gas valve should be in place sound 3 Turn off the boiler via the fascia control knob and electrically isolate the boiler Verify that the electrical supply has been isolated Figure 1 Gas Inlet PTN 4 The fascia panel containing the on off knob should be removed via the four retaining screws Fascia PCB should have the electrical lead still con
21. should have the electrical lead still connected and the knob left to the off position 5 Please be aware that some of the KC25 boilers are fitted with a plastic translucent cover is held in place by a Phillips screw on the gas valve Prior to adjustment this shield should be removed 6 On the right hand board as you look at the boiler face on you will locate a small electrical bridging jumper attached to the board The jumper is red in colour approx 18mm in from the front edge and 12mm up from the bottom edge of the board see Figure 2 Figure 2 PCB Fan Speed Jumper 7 Please note The following procedure shall only be carried out by a trained and competent operative As the adjustment of the gas valve high and low fire adjustment screw must the indertaken with the appliance running precautions should be taken to avoid contact with any exposed electrical components and connections To set the high fire adjustment you will need to lock the boiler in this mode To achieve this you need to remove the jumper from the board Then with the jumper removed restore power to the boiler Keeping your hands out of the appliance whilst the electrical supply is on turn the boiler on and off using the facia control knob On each operation of the knob to on then off will result in the illumination of one of the four lower green LEDs in succession High fire is denoted when the third lower green LED is illuminated At this point electrically is
22. voltage Supply wiring should be in PVC insulated cable not less than 1 0mm to BS 6500 Table 16 material code HO5VV F 3 The permanent live supply connection may be via a 3 amp fused double pole switch serving only the boiler Refer to Chapter 2 Section 2 4 Electrical Supply The system controls and 2A switched supply for the boiler must also be supplied via this isolator 4 Securely tighten the terminal screws and route the cable through the re openable cable clips Ensure all cables are secured and that the cord grip bush is tightened to securely grip the main cable at entry to the cabinet Remove the factory fitted link wire between terminals SL and SL Link on the boiler The supply cable s must be connected to the main terminals as follows Installation amp Servicing Instructions Page 17 WD209 1 2000 Chapter 3 Installation The Keston Celsius 25 8 25P 3 9 N Blue wire Neutral for 3A permanent and 2A switched supplies PL Brown wire Live 3A permanent supply Yellow Green Wire Earth SL Brown wire Live ZA switched supply OR SL 8 SL LINK Link connection via volt free external controls LO To external 230V remote lockout monitoring optional RUN To external 230V remote run monitoring optional Ensure connection is made such that if the cable slips in its anchorage the current carrying conductors become taut before the earthing conductor EXCHANGING A BOILER Before removing an
23. IAL No COMMENTS COMMENTS SIGNATURE SIGNATURE SERVICE 5 pate SERVICE 6 bare ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE SERVICE 7 pate SERVICE 8 bare ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE SERVICE 9 pate SERVICE 10 bare ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE Installation amp Servicing Instructions Page 49 WD209 1 2000 Siendi 10 Setting Procedure The Keston Celsius 25 8 25P 10 HIGH 8 LOW COMBUSTION SETTING PROCEDURE It is important that the combustion at both high and low fire is checked and set when conducting any work on the combustion circuit especially gas valve replacement The procedure below details this setting using an electronic means of locking the boiler on high or low fire rate Where the instruction requires that the electrical supply to the appliance is isolated correct isolation pro
24. M THE FOLLOWING THE HEATING AND HOT WATER SYSTEM COMPLIES WITH CURRENT BUIDING REGULATIONS THE APPLIANCE AND ASSOCIATED EQUIPMENT HAS BEEN INSTALLED AND COMISSIONED IN ACCORDANCE WITH THE MANUFACTURER S INSTRUCTIONS IF REQUIRED BY THE MANUFACTURER HAVE YOU RECORDE A CO CO RATIO READING C0 CO N A YES RATIO THE OPERATION OF THE APPLIANCE AND SYSTEM CONTROLS HAVE BEEN DEMONSTRATED TO THE CUSTOMER Installation amp Servicing Instructions Page 48 WD209 1 2000 Chapter 9 Benchmark Checklist Final The Keston Celsius 25 amp 25P SERVICE INTERVAL RECORD It is recommended that your heating system is serviced regularly and that you complete the appropriate Service Interval Record Below Service Provider Before completing the appropriate Service Interval Record below please ensure you have carried out the service as described in the boiler manufacturer s instructions Always use the manufacturer s specified spare part when replacing all controls SERVICE 1 pate SERVICE 2 pate ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SERIAL No COMMENTS COMMENTS SIGNATURE SIGNATURE SERVICE 3 pate SERVICE 4 bare ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No TEL No CORGI ID CARD SERIAL No CORGI ID CARD SER
25. O1907 INIT IS As gt Y 14 TINS o Dzms zasau i Kaouad ABWAOJSUBA o N Sa ul yougnau upu o A 022 Aaoujad Jadi zod Jawo jsusa 0 1 o pa uwa Up aay upon c pa sauna palo des UNLNUS alk d NJ N 423442 OU 403 AQT O zi Abt yous s 333433 194 of 1095 d vazom 109 ues o ando HE 109338 1104 404 AQ O 1035 ani auods 1045 paulo ELECTRICAL WIRING DIAGRAM WD209 1 2000 5 5 31 Page Installation amp Servicing Instructions The Keston Celsius 25 amp 25P ALIHM 13001A NADE N3397 M0 7144 N3323D ama Awad 129714 MOVISA aa NNN 10X907 ANIT IS AS S SS S S S S SS S S S S S
26. P h Turn on the electrical supply to the boiler and allow the boiler to reach operating temperature levels i Recheck the burner pressure by following the procedure detailed in Section 4 7 j Remove the combustion test point plug from the flue pipe This is situated on the flue spigot out of the cabinet k Carry the full procedure detailed in section 4 9 COMBUSTION TESTING MANDATORY l Replace the combustion test point plug Check all joints for soundness up to the gas burner n Complete the Gas Boiler Commissioning Checklist Service Interval Record Chapter 9 Installation amp Servicing Instructions Page 39 WD209 1 2000 Siad 7 Replacement Of Parts The Keston Celsius 25 amp 25P 7 REPLACEMENT OF PARTS INDEX 7 0 GENERAL 7 1 PRECAUTIONS 7 2 ACCESS 7 3 PROCEDURES GENERAL 7 4 ELECTRICAL 7 4 1 FASCIA PCB 7 4 2 BOILER FLOW 8 RETURN THERMISTORS 7 4 3 CABINET TEMPERATURE SENSOR 7 4 4 FLOW OVERHEAT THERMOSTAT 8 FLUE PROTECTION THERMOMSTAT 7 4 5 WATER PRESSURE SWITCH 7 4 6 IGNITION PCB 7 4 7 CONTROL PCB 7 4 8 COMBUSTION BLOWER 7 4 9 GAS CONTROL VALVE 7 5 SPARK IGNITION FLAME DETECTION ELECTRODE 7 6 BURNER 7 7 HEAT EXCHANGER 7 8 CONDENSATE TRAP 7 9 PUMP Installation amp Servicing Instructions Page 40 WD209 1 2000 eieiei 7 Replacement Of Parts The Keston Celsius 25 amp 25P 7 0 GENERAL The following must always be carried out by a competent qualified person 7 1 PRECAUTIONS i Always switch o
27. PCB ls there 230VAC at position G on ignition PCB Replace ignition Installation amp Servicing Instructions ls there 230VAC at gas valve connection F Replace gas valve lead Is there 230VAC at positio H on control PCB iring betw een ignition PCB and control PCB faulty Are gas valve solenoids faulty Replace solenoid s Page Replace gas valve 28 WD209 1 2000 Chapter 5 Fault Finding The Keston Celsius 25 8 25P THERMOSTAT OVERHEAT Is flow overheat thermostat Replace flow overheat Is modulation LED1 lit Y open circuit when flow p gt thermostat temperature is lt 60 C Check system for blockage z and or air lock Reset lockout by tuming user knob off then on Check pump is operating Replace cabinet thermal Is modulation LED lit Y tuse lid check all combustion area joints for leaks Reset flue overheat thermostat Does flue Replace flue overheat Is modulation LEDS lit Y temperature exceed 90 C P uap 4 thermostat when boiler is running at maximum temperature Check gas rate burner pressure combustion levels and flue and air systems SERVICE BOILER AFTER ANY THERMOSTAT OVERHEAT IS ACTIVATED THE BOILER WILL NOT RESTART OR CLEAR THE ERROR DISPLAY UNTIL THE UNIT IS RESET MANUALLY BY TURNING THE BOILER OFF THEN ON BY THE USER CONTROL KNOB Installation amp Servicing Instructions Page 29 WD209 1 2000 Chapter 5 Fault Finding The Kest
28. The flue and air terminals must be fitted to the appropriate duct using solvent weld adhesive lf 75mm terminals are required these can be obtained from your Keston Boilers stockist Request part numbers C 17 2 26 00 0 Flue Qutlet Air Inlet Terminals terminals and C 17 2 00 60 0 50 to 75 adapters Figure 2 8 1 Terminals 2 8 2 Maximum Lengths The maximum lengths of both air inlet pipe and flue outlet pipe when no bends are used are as detailed below 50mm 75mm Maximum Air Inlet Length i 39 0m 117 0m Maximum Flue Outlet Length e 20 0m 60m Maximum Total Flue and Air Intake Length 40 0m 120 0m However each bend used has an eguivalent length that must be deducted from the maximum straight length stated above Knuckle bends must not be used A 92 5 sweep elbow is equivalent to 1 0m straight length Example assuming 50mm muPVC flue and air pipework Air inlet uses two one 92 5 sweep elbows Hence maximum length permissible i e a b in figure 2 8 2 39 0m 1 0m 1 0m 37 0m Installation amp Servicing Instructions Page 11 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 8 25P AAA AAA Flue outlet uses one 92 5 sweep elbow Hence maximum length permissible i e c d in figure 2 8 2 20 0m 1 0 m 19 0m Celsius 25 Figure 2 8 2 Flue amp Air Maximum Length Example 2 8 3 Slope Horizontal flue outlet pipework MUST slope at least 2 degrees 32 mm per
29. WD209 1 2000 The Keston Celsius 25 8 25P KESTON Celsius 25 Fan Powered High Efficiency Modulating Domestic Condensing Gas Boiler Installation And Servicing Instructions Celsius 25 amp 25P Models CE PI No 87BL49 GC No 41 930 06 These instructions must be left either with the user or next to the site gas meter Boilers 34 West Common Road Hayes Bromley Kent BR2 7BX Tel 44 0 20 8462 0262 Fax 44 0 20 8462 4459 email info keston co uk web www keston co uk C Benchmark WD209 1 2000 Section 1 mb Q gt GQ N 4 1 4 2 4 3 4 4 4 5 4 7 The Keston Celsius 25 amp 25P CONTENTS Description GENERAL INSTRUCTION Description Boiler Schematic Related Documents Performance Data Optional Accessories BOILER LOCATION Dimensions amp Minimum Clearances Service Connections Position Electrical Boiler Size Selection Gas Supply Water Systems Flue System Air Supply Compartment Installation Condensate Drainage INSTALLATION OF THE BOILER Wall Mounting Bracket Mounting The Boiler Assembly Practice Installing Flue And Air Pipes Condensate Drainage Water System Gas Supply Electrical Supply Exchanging A Boiler COMMISSIONING OF THE BOILER Initial Flushing Gas Supply Electrical Installation LPG Gas Initial Firing Hot Flushing Checking The Gas Pressure Page i WD209 1 2000 The Keston Celsius 25 8 25P 4 8 Timing The G
30. ally isolate the boiler verify electrical isolation and then fit the jumper back in its original position restore power to the boiler and turn the boiler on using the control knob The boiler should go through its start up procedure and lock itself on high fire with all four LEDs illuminated The flue gas composition can now be tested via the flue spiggot test point A reading of 8 5 to 9 CO for natural gas G20 boilers should be present or 9 5 to 10 COz for LPG G31 If the COzis not found to be within this range the gas valve high fire adjustment screw should be turned to achieve this figure This screw can be identified from this manual page 20 item number 8 in addition this screw is identified by the use of tamper paint on the screw head 2 3 WD485 0 2008 8 After the high fire adjustment has been made checked isolate the electrical supply to the boiler verify safe isolation and remove the fan speed jumper again Restore the electrical supply to the boiler and then turn the boiler on and off using the fascia control knob Low fire position is confirmed when the second green LED is illuminated isolate the electrical supply verify safe isolation and re fit the fan speed jumper Restore the electrical supply and turn the boiler on via the fascia control knob At this point the boiler will fire up with just the first LED on The low fire flue gas reading should be 8 to 8 5 COzfor natural gas or 8 9 to 9 3 COzfor LPG DO NOT ADJUST
31. as Meter 4 9 Combustion Testing 4 10 Handing Over To The User 5 FAULT FINDING 5 1 Electrical Control Sequence 5 2 Fault Finding Flow Chart General 5 3 Fault Finding Flow Chart Detailed 5 4 Functional Flow Wiring Diagram 5 5 Electrical Wiring Diagram 5 6 Illustrated Wiring Diagram 5 7 Exploded Assembly Diagrams 6 SERVICING 6 1 Pre Service Checks 6 2 Recommended Routine Service 7 REPLACEMENT OF PARTS 7 0 General 7 1 Precautions 7 2 Access 7 3 Replacement Procedure 7 4 Electrical Components 7 5 Spark Ignition Flame Detection Electrode 7 6 Burner 7 7 Heat Exchanger 7 8 Condensate Trap 7 9 Pump 8 SPARE PARTS LISTINGS 9 GAS BOILER COMMISSIONING CHECKLIST 10 HIGH amp LOW COMBUSTION SETTING PROCEDURE Page ii WD209 1 2 h rd neral Instruction The K n Celsius 2 25P 1 GENERAL INSTRUCTION 1 1 DESCRIPTION The Celsius 25 is unique in its concept and design It comprises a high efficiency stainless steel heat exchanger coupled with a low emissions burner to deliver ultra high efficiency condensing mode operation within a compact wall hung cabinet The unit automatically adjusts gas and air rate according to demand to give an output in the range of 7 0kW to 25 2kW natural gas model The integral standard UPS Grundfos pump is automatically controlled across the three speeds to best match water flow rate to heat output amp further increase appliance efficiency While the application for which the Celsius 25 was designed is the sam
32. associated central heating system must be flushed in accordance with the guidelines given in BS7592 1992 Treatment of water in domestic hot water central heating systems This must involve the use of a proprietary cleaner such as Fernox Superfloc or BetzDearborn s Sentinel X300 or X400 Full instructions are supplied with the products but for immediate information please contact Fernox on 01799 550811 or BetzDearborn on 0151 420 9563 For long term protection against corrosion and scale after flushing it is recommended that an inhibitor such a Fernox MB1 or BetzDearborn s Sentinel X100 is dosed in accordance with the guidelines given in BS7593 1992 GAS SUPPLY Connect the gas supply to the appliance Details of gas supply requirements are given in Chapter 2 Section 2 6 Gas Supply Supply of adequate gas pressure with the boiler running is critical to ensure reliable operation of the boiler Connections 0 75 inch BSPF ELECTRICAL SUPPLY The entry point s for the electrical supply cable s is in the base of the appliance see Section 2 2 Service Connections fig 2 1 2 via two cord grip bushes Feed the cable s through its bush and route inside the cabinet to the connection strip located to the front bottom right of the cabinet 1 The electrical supply must be as specified in Chapter 2 Section 2 4 Electrical Supply WARNING THIS APPLIANCE MUST BE EARTHED 2 All external controls and wiring must be suitable for mains
33. ation operation Isolate the electrical supply verify safe isolation and remove the fan speed jumper Restore the electrical supply to the boiler and then turn the boiler on and off using the fascia control knob until there are no lower LEDs illuminated Isolate the electrical supply verify safe isolation and refit the jumper to the board refit boiler facia and case Restore the electrical supply to the boiler and hand over to the user Page2 WD296 1 2008 If following the above procedure combustion levels described above at both high and low rate could not be obtained please turn off the appliance and isolate the gas to the appliance Telephone KESTON BOILERS technical support phone no 0208 462 0262 v Note the original appliance serial number and production date on the old data badge vi Stick the new KC25P databadge C 08 1 00 35 0 Fig 5 7 4 item 3 into the appliance over the old data badge vii Indelibly mark the appliance serial number and production date on the new data badge viii Reassemble Section 7 3 Keston Condensing Boilers LPG Specifications Supply pressure High 45 mbar Normal 37 mbar Low 25 Mbar Page3 WD297 1 2008 KESTON Celsius 25 NG CONVERSION INSTRUCTIONS FOR KESTON CELSIUS 25P MODEL The Keston Condensing Boiler CELSIUS 25P is supplied fabricated for LP Gas combustion at a supply pressure of 37 mbar These conversion instructions must be read in conjunction with the Keston Condensing Boil
34. back into the boiler i With the boiler operating at a low return temperature i e less than 50 C check that the condensate flows freely from the condensate line e oo o 6 2 Recommended Routine Service a Remove the outer case by first removing the securing screws at the top and bottom of the appliance b Remove the burner head Section 7 6 and inspect the burner appearance Black markings or other discoloration s on the gauze indicate too much gas or a lack of air possibly due to a blocked air inlet Any breakage s or damage to the burner mesh indicate the burner must be replaced C If necessary clean the burner with a mild household detergent and rinse under a hot running tap d If necessary from visual inspection clean the heat exchanger using a suitable stiff plastic bristle brush vacuum out any large particles and flush the heat exchanger with fresh water until the water flowing from the condensate drain is clear e Remove the condensate trap Section 7 8 and clean by flushing through with clean running water f Check the electrode assembly mounted on the heat exchanger If the point is damaged or burnt replace it Check that the spark gap measures 3 mm g Replace the burner head renewing the gasket if necessary and reconnect the gas air supply Ensure the flanged gas air supply joint is air tight Installation amp Servicina Instructions Paqe 38 WD209 1 2 h r 6 Servicin The K n Celsius 2 25
35. boiler on the bracket studs using the nuts supplied 3 3 ASSEMBLY PRACTICE Remove all plastic debris and burrs when installing air intake piping Plastic filings caused by cutting muPVC pipe must not be allowed to be drawn into the combustion air blower Prevent dust entering the air intake when cutting on building sites Blower failure which is determined to be caused by plastic filings or other debris will not be covered by guarantee 3 4 INSTALLING FLUE AND AIR PIPES When installing a replacement boiler a new flue system must be fitted DO NOT RE USE THE ORIGINAL FLUE SYSTEM Remember the flue pipe must slope downwards back towards the boiler and this is best achieved using 92 5 bends a Using the template supplied within the boiler packaging mark the positions of the two holes for the flue and air pipes on the wall s or ceiling b Drill the two holes in the wall ceiling preferably using a core drill Installation amp Servicing Instructions Page 15 N WD209 1 2000 3 4 1 3 4 2 3 4 3 Chapter 3 Installation The Keston Celsius 25 8 25P Diameter of holes i Allowance must be made for socketed lengths if these are to be passed through the holes du unsocketed 56mm diameter ds socketed 65mm NV D diameter e For horizontal runs of flue pipe the holes must either be oversized or cut at a 2 k slope the latter may be difficult on long L holes Oversizing For every 1m length
36. ce is installed in a room containing a bath or shower any electrical switch or appliance control utilising mains electricity should be so situated that it cannot be touched by a person using the bath or shower Compartment installation is permitted such compartments must be constructed in accordance with BS 6798 Chimneys not used for venting any other appliance may be used Secure air amp flue pipes at chimney outlet NB Refer to Section 2 8 3 Figure 2 3 The wall on which the boiler is mounted must be of suitable load bearing capacity and must be non combustible The Keston Celsius 25 can be located virtually anywhere desired provided that all regulations are complied with Because of the boiler s compact size and venting flexibility the installation is not limited to a boiler room setting Before locating the boiler near a living space consider whether the sounds generated by the boiler will be objectionable The boiler may be located within a cupboard enclosure to reduce noise levels if located within a living space LPG boilers must not be installed in a cellar 2 4 ELECTRICAL 2 4 1 Electrical Connections The boiler must be connected to a permanent 230V 50Hz supply fused at 3A An additional switched live supply 230V 50Hz rated at 2A or a pair of volt free contacts must be provided from the external system controls Wiring external to the boiler must be in accordance with curren
37. cedures shall be followed Always verify safe electrical isolation before working on an appliance 1 Electrically isolate the appliance verify that the electrical supply has been isolated then removethe appliance case by first removing the securing screws at the top and bottom of the appliance 2 Once the casing has been removed keeping your hands away from exposed electrical components and connections switch the electrial power supply to the appliance back on Prior to commencing the adjustment procedure the boiler should be brought up to the normal working temperature a gas working pressure of at least 18mbar should be present at the gas inlet test nipple see Figure 1 and the thin neoprene plastic pipe between the venturi and gas valve should be in place sound Gas Inlet PTN Figure 1 Gas Inlet PTN 3 Turn off the boiler via the fascia control knob and electrically isolate the boiler Verify that the electrical supply has been isolated 4 The facia panel containing the on off knob should be removed via the four retaining screws Fascia PCB should have the electrical lead still connected and the knob left to the off position 5 Please be aware that some of the C25 boilers are fitted with a plastic translucent moisture cover over the top of the gas valve this cover is held in place by a Phillips screw on the gas valve Prior to adjustment this shield should be removed Figure 2 PCB Fan Speed Jumper 6 O
38. d persons NB When servicing ensure that the gas and electrical supplies to the boiler are isolated before any work starts It should be noted that turning the user control know fully anticlockwise to Standby does not isolate the electrical supply and parts of the boiler will remain live Hazardous materials are not used in the construction of the Celsius 25 However due care should be taken when handling boiler components All joints should be checked for soundness after servicing and before firing the appliance After servicing complete the Gas Boiler Commissioning Checklist Service Interval Record Chapter 9 These forms Chapter 9 should be kept in a safe place for the life of the boiler 6 1 Pre Service Checks It is recommended that an inspection should be carried out prior to shutting down the unit for servicing Remove the front cover by removing the screws retaining the top and bottom The following items should be observed Smooth starting and running of the blower Smooth lighting of the burner Check for leakage of gas gas air or combustion products Check for condensate leaks Check that the pump error LED red does not indicate high or low flow rate at any time during operation Check for water soundness g Inspect the flue vent and air intake pipework Joints must be sound and all pipework well bracketed h Check that there is a steady fall back to the boiler from the flue pipe to allow condensate to run
39. densation and electrical y appliance connections are as shown Gas 10 Wh t 0 5 inch BSP female Flow Return N e apr is operating 0 75 inch BSP female Figure 2 1 1 An optional stand off frame is 100 Minimum Clearances also available which mounts behind the boiler to leave a 50mm deep space behind the Figure 2 1 2 boiler This is to permit pipe Dimensions All dimensions i routing behind the boiler if inmm required See Section 1 5 Air Intake A Optional Accessories Flue 2 3 POSITION The Celsius 25 is not suitable for WA external installation The boiler A may be installed in any room or internal space although particular attention is drawn to the requirements of the current IEE Wiring Regulations and in Scotland the electrical provisions of the Building M D v Regulations applicable in 471 4 Base View LACA AA APA AA AAA AA AAA AAA AAA A 34 Air Flue 34 a iy kina 270 i 20 i 162 Sar Y re ae re l i 25 I lt gt lt gt I I I I AO CC i a i m 7 Q Top View 3 3 S 5 gt Service Connection Locations All dimensions are in mm 2 Installation amp Servicing Instructions Page 5 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 amp 25P Scotland with respect to the installation of the boiler in a room or internal space containing a bath or shower Where a room sealed applian
40. e Section 7 3 Keston Condensing Boilers NG Specifications Supply pressure High 25 mbar Normal 20 mbar Low 17 mbar Page3 WD485 0 2008 KESTON CELSIUS 25 amp 25P Gas valve replacement procedure for KESTON CELSIUS 25 amp 25P boilers These replacement instructions must be read in conjunction with the Keston CELSIUS 25 amp 25P Installation amp Servicing Instructions WD209 Before proceeding to the replacement procedure please check if the tamper paint on the adjustment cap is intact If the tamper paint is broken please return the gas valve to KESTON BOILERS To replace the Gas Valve Fig 5 7 3 item 80 you must carry out the following sequence O CO O10 No Isolate the appliance Section 7 1 Gain access Section 7 2 Remove the push on connector block to the gas valve Remove the plastic air tube to the base of the gas valve Undo the union fitting Fig 5 7 3 item 89 securing the gas inlet pipe to the gas valve Undo the four bolts fixing the mixing venturi fig 5 7 3 item 81 to the venturi elbow fig 5 7 3 item 82 Remove the gas valve and mixing venturi as one Separate the mixing venturi from the gas valve by unscrewing the BSP nipple between the two Reassemble Section 7 3 Check the gas rate and combustion MANDATORY Although the gas pressure is preset at the factory it is required to assure proper combustion by measuring gas input and the level of carbon dioxide or oxygen and carbon
41. e and 50 amp 150 ppm In any event the CO level at low rate must ALWAYS be less than CO levels at high rate To measure CO levels in the Keston boiler remove the 1 8 plug from the flue outlet pipe spigot Figure 5 7 4 item 19 Insert the probe of a calibrated combustion analysis meter and sample the gases as instructed in the test equipments instructions When firing the boiler for the first time since installation the CO level at high rate may be between 100 220 ppm and between 50 80 ppm at low rate This is due to compounds used during manufacture curing within the combustion chamber On boilers which have been fired for more than one hour since installation the CO levels should not exceed 150 ppm at high rate and 50 ppm at low rate If CO levels above these values are experienced the combustion chamber and flue system should be investigated 4 10 HANDING OVER TO THE USER It is important to fully explain the following a b d e f Procedure to light and turn off the boiler including isolation of the electrical supply if necessary The function of the lockout feature must be explained If the red lockout LED flashes twice every 2 seconds this means that the boiler has failed to light Turn off the user control knob off fully anticlockwise and wait 10 seconds Turn ON again and wait i If lockout recurs immediately then the gas supply should be checked as ON otherwise consult a Service Engineer ii If i
42. e as those which other boilers are used the Keston Celsius 25 has the added advantage of very high efficiency and small diameter plastic flue which can be extended up to 60 metres horizontally or vertically The Keston Celsius 25 uses a variable speed combustion blower to deliver a premix of gas and air to a downward firing burner in a high efficiency single pass heat exchanger The flue system is room sealed and fan powered The ignition is direct spark and fully automatic The boiler housing is not waterproof and should be installed in a position where it will always be dry Combustion air is drawn from the cabinet which is connected to outside atmosphere via a small diameter plastic intake pipe The cabinet therefore remains under negative pressure at all times the boiler is operating The boiler is suitable for connection to open vented or preferably sealed systems The boiler heat exchanger is made from highly corrosion resistant stainless steel in corrugated pipe form which provides massive surface area within a compact dimension The hot combustion gases from the down firing burner pass around the stainless steel pipes imparting heat into the system water The integral standard 3 speed Grundfos pump within the appliance cabinet ensures the heat exchanger receives correct water flow when firing The Celsius 25 is not a high water content boiler and does not contain the metal mass or water volume of a cast iron or steel boiler This boiler i
43. e jumper from the board Then with the jumper removed restore power to the boiler Keeping your hands out of the appliance whilst the electrical supply is on turn the boiler on and off using the facia control knob On each operation of the knob to on then off will result in the illumination of one of the four lower green LEDs in succession High fire is denoted when the third lower green LED is illuminated At this point electrically isolate the boiler verify electrical isolation and then fit the jumper back in its original position restore power to the boiler and turn the boiler on using the control knob The boiler should go through its start up procedure and lock itself on high fire with all four LEDs illuminated The flue gas composition can now be tested via the flue spiggot test point A reading of 8 5 to 9 CO2 G20 should be present If the COzis not found to be within this range the gas valve high fire adjustment screw should be turned to achieve this figure This screw can be identified from this manual page 20 item number 8 in addition this screw is identified by the use of tamper paint on the screw head 8 After the high fire adjustment has been made checked isolate the electrical supply to the boiler verify safe isolation and remove the fan speed jumper again Restore the electrical supply to the boiler and then turn the boiler on and off using the fascia control knob Low fire position is confirmed when the second green LED is il
44. e of the boiler 2 6 GAS SUPPLY A gas meter should be connected to the service pipe by the local gas region or their contractor An existing meter should be checked preferably by the gas region to ensure that the meter is adequate to deal with the rate of gas supply required Installation pipes should be fitted in accordance with BS 6891 Minimum Maximum Gas Pressure Natural gas pressure before the gas valve must be maintained at between 18 mbar 7 2 in WG and 22 mbar 8 8 in while the boiler is running LPG pressure must be maintained between 31 5 mbar 12 4 in w g and 37 6 mbar 14 8 in w g while the boiler is running Gas pressures above or below these levels will lead to problems associated with the gas valve s internal pressure regulator Supply pipes to the boiler must not be sized less than the boiler inlet connection 15 mm Due consideration must be given to the supply pressure to other gas appliances in the premises Reduction in dynamic gas supply pressure will result in intermittent ignition failures Ensure gas supply pipe work is adequately sized for the length of run from the meter to the boiler at a supply rate of 26 1 kW A gas cock is supplied loose with the boiler This cock should be fitted in the gas line to the boiler as close to the boiler as possible so that it is easily identified as the cock to isolate the boiler 2 7 WATER SYSTEMS All piping must be installed in accordance with all applicable local and Water Sup
45. ection must have a tick in one or other of the boxes ROOM T STAT amp TIME amp TEMPERATURE CONTROL TO i HEATING PROGRAMMER TIMER _ aa te Ata TIME amp TEMPERATURE CONTROL TO HOT CYLINDER T STAT amp L ee reg il WATER PROGRAMMER TIMER 1 HEATING ZONE VALVES FIED L NOT REQUIRED HOT WATER ZONE VALVES FED L NOT REQUIRED THERMOSTATIC RADIATOR VALVES FITTED AUTOMATIC BYPASS TO SYSTEM FITTED NOT REQUIRED FOR ALL BOILERS CONFIRM THE FOLLOWING THE SYSTEM HAS BEEN FLUSHED IN ACCORDANCE WITH THE BOILER MANUFACT URER S INSTRUCTIONS THE SYSTEM CLEANER USED THE INHIBITOR USED FOR THE CENTRAL HEATING MODE MEASURE amp RECORD O GAS RATE m hr t BURNER OPERATING PRESSURE IF APPLICABLE N A mbar CENTRAL HEATING FLOW TEMPERATURE C CENTRAL HEATING RETURN TEMPERATURE C FOR COMBINATION BOILERS ONLY HAS A WATER SCALE REDUCER BEEN FITTED YES NO WHAT TYPE OF SCALE REDUCER HAS BEEN FITTED FOR THE DOMESTIC HOT WATER MODE MEASURE amp RECORD H GAS RATE m hr ft hr MAXIMUM BURNER OPERATING PRESSURE IF APPLICABLE N A mbar COLD WATER INLET TEMPERATURE HOT WATER OUTLET TEMPERATURE WATER FLOW RATE FOR CONDENSING BOILERS ONLY CONFIRM THE FOLLOWING THE CONDENSATE DRAIN HAS BEEN INSTALLED IN ACCORDANCE WITH THE MANUFACTURER S INSTRUCTIONS FOR ALL INSTALLATIONS CONFIR
46. embly Installation amp Servicing Instructions Page 35 WD209 1 2000 eici 5 Fault Finding The Keston Celsius 25 amp 25P 5 7 4 Casing Assembly Installation amp Servicing Instructions Page 36 WD209 1 2000 5 7 5 Exploded Diagrams Parts Reference List Boiler Controls Assembly Fig 5 7 1 GC Number Code 100 106 Waterway Condensate amp Flue Assembly Fig GC Number Code 34 Air Gas Assembly Fig 5 7 3 GC Number Code Casing Assembly Fig 5 7 4 GC Number Code 9 3 21 19 Chapter 5 Fault Finding The Keston Celsius 25 amp 25P
47. er Installation amp Servicing Instructions WD209 To convert to NG Natural Gas you must carry out the following sequence Isolate the appliance Section 7 1 Gain access Section 7 2 Replace the LPG gas valve part number C 08 3 20 00 0 with the NG gas valve part number C 08 3 02 00 1 according to Section 7 4 9 Check the gas rate and combustion MANDATORY It is important that the combustion at both high and low fire is checked and set when conducting any work on the combustion circuit especially gas valve replacement The procedure below details this setting using an electronic means of locking the boiler on high or low fire rate Where the instruction requires that the electrical supply to the appliance is isolated correct isolation procedures shall be followed Always verify safe electrical isolation before working on an appliance 1 Electrically isolate the appliance verify that the electrical supply has been isolated then removethe appliance case by first removing the securing screws at the top and bottom of the appliance 2 Once the casing has been removed keeping your hands away from exposed electrical components and connections switch the electrial power supply to the appliance back on Prior to commencing the adjustment procedure the boiler should be brought up to the normal working temperature a gas working pressure of at least 18mbar should be present at the gas inlet test nipple see Figure 1 and the thi
48. er Restore the electrical supply to the boiler and then turn the boiler on and off using the fascia control knob until there are no lower LEDs illuminated Isolate the electrical supply verify safe isolation and refit the jumper to the board refit boiler facia and case Restore the electrical supply to the boiler and hand over to the user If following the above procedure combustion levels described above at both high and low rate could not be obtained please turn off the appliance and isolate the gas to the appliance Telephone KESTON BOILERS technical support phone no 0208 462 0262 Installation amp Servicing Instructions Page 51 KESTON CONDENSING BOILERS IMPORTANT CELSIUS 25 8 25P INSTALLATION KEY POINTS g Read Installation Manual Carefully g Ensure that there is at least 9 feet head of water pressure at the top of the boiler and an open bypass across primary flow and return for open vented systems g Ensure that ALL dust particles filings plastic chips etc are removed from the inlet pipe Ifthe installation is a replacement the system must be flushed clean System should be drained hot then refilled then drained again until the water is clean g Ensure that there is a proper electrical supply ie 230V fused at 3A for the permanent live and that the factory link between SL and SL link has been removed Take great care with pipe connections to ensure that no damage is done to the internal pipewor
49. esent the unit may go to overheat or water pressure lockout If this occurs clear the blockage and or purge the air from the system turn the user control knob off fully anticlockwise and repeat the procedures If ignition does not occur the boiler on yellow LED will be extinguished and at approximately 20 second intervals the electronic ignition system will make four further attempts to light the burner If the ignition is successful and the boiler is operating normally the green mains LED and the boiler on yellow LED will be illuminated simultaneously If after five automatic attempts the boiler still fails to ignite the yellow boiler on lamp will be extinguished and the red lockout lamp will flash twice every two seconds If after five manual attempts to allow for purging of any air in the gas line the boiler still fails to ignite indicated by the red lockout lamp refer to Section 5 2 Fault Finding Flow Chart f Check for gas soundness between the gas service cock and connection to the burner manifold HOT FLUSHING a Allow the system to heat up checking for water soundness b Follow instructions provided with the cleaning agent ie Fernox Supafloc or equivalent Turn off the boiler and flush the water system while still hot Thoroughly flush the system with clear water C Refill the system using a quality water treatment such as Fernox MB1 For sealed systems fill to the required Initial Design Pressure
50. f air vent Air from room Air direct from Outside High 306 cm 153cm Low 306 cm 153cm Both vents must communicate to the same room or be on the same wall to outside 2 11 CONDENSATE DRAINAGE Being a condensing boiler the Celsius 25 is fitted with a condensate trap at the base of the heat exchanger and flue assembly with facility to connect to a drain point underneath the appliance Use only plastic piping and do not reduce below 15 mm internal diameter within the dwelling Condensate should preferably be drained into the sanitary waste system or alternatively the rainwater system of the property in most cases Ensure in all cases that the disposal of the condensate is in accordance with any local regulations in force Termination of the pipe must be either at a branch or stack internal to the house or externally at an open gully Alternatively discharge into a purpose made condensate soakaway can be considered Existing or purpose built drains must use suitable corrosion resistant material as condensate is mildly acidic The connection to the condensate drain of the boiler and the condensate drain pipework itself should be properly sealed to ensure there is no possibility of leakage into the dwelling A minimum slope downwards towards the drain of 1 in 20 is essential Freezing of the termination and pipework must be prevented Any drainage pipes outside the property must be at least 32 mm inside diameter Installation amp
51. fan pcb ON OFF Flashing Fan pcb faulty Replace constantly Installation 8 Servicing Instructions Page 24 WD209 1 2000 Chapter 5 Fault Finding The Keston Celsius 25 8 25P 5 2 FAULT FINDING FLOW CHART GENERAL PRIMARY CHECKS The following conditions should be checked before commencing the fault finding process 1 A permanent live of at least 190VAC should be present at terminal 1 PL 2 Asignal live of at least 190VAC should be present at terminal 4 SL 3 Earth continuity should be present at terminal 3 E 4 All isolating valves should be open and both the system and boiler should be fully vented 5 A gas supply pressure of at least 18 mbar for natural gas or 31 mbar for LP gas is measured at the inlet when the boiler fires or attempts to fire The Celsius 25 requires a gas supply pipe rated for at least 26 1kW input irrespective of the system requirement 6 Check the flue installation is correct and with obstruction of flue or air ducts NOTE The Celsius 25 features a 120 seconds anti cycle post purge function Allow 120 seconds to pass before commencing fault finding START ls the green mains lamp flashing rapidly 5Hz ls the green mains lamp flashing slow ly 1 Hz ls the green mains lamp off NB Once rectified all faults and error displays can be reset by turning the user knob off then on If the unit will not reset and the fault has been rectified check co
52. ff the mains electricity supply and disconnect the plug at the isolating switch and socket If a switch only is used then remove the fuse ii Gain access to the appliance Section 7 2 and turn off the gas supply at the appliance service cock WARNING Parts of the boiler internal wiring will remain live even after turning the User Control Knob to the Standby position Shut off the power supply at the isolating switch before working on the appliance 7 2 ACCESS i Remove the cabinet by removing the screws to the top and bottom of the cabinet ii Access to the control ignition and fascia PCB s of the control panel can be gained by removing the controls cover at the bottom left hand corner of the boiler Remove the two sliding covers to the sides of the housing then gently pull the control panel forward of the PCB housing 7 3 REPLACEMENT PROCEDURES 1 Always replace in the reverse order unless otherwise stated ii Electrical connections must be remade in accordance with the Wiring Diagram Section 5 5 ili Test the soundness of any gas carrying or water carrying joint broken during the service procedures 7 4 ELECTRICAL COMPONENTS 7 41 Fascia PCB Fig 5 7 1 item 98 1 Isolate the appliance Section 7 1 i Gain access Section 7 2 iii Remove the user control knob by fulling forward off the shaft iv Undo and remove the locknut securing the fascia PCB to the front plate of the controls housing v Disconnect the fascia PCB
53. hanger thus increasing the boiler efficiency further by releasing the latent heat of condensation This condensate falls to the bottom of the heat exchanger where it is separated from the flue gases and exits from the boiler through the condensate drain Any condensate formed in the flue runs back down the flueway and is drained at the base of the flue connection to the heat exchanger or drain points within the flue Installation amp Servicing Instructions Page 3 WD209 1 2000 Chapter 1 General Instruction The Keston Celsius 25 amp 25P 15 LEGEND Gas Valve Burner Auto Air Vent Gas Connection Condensate Trap Circulating Pump Flow Connection Return Connection Fascia Display User On Off Control Heat Exchanger Gas Air Mixing Chamber Mains Transformer 14 Air Intake Connection 15 Flue Exhaust Connection O OO IO5 Q CH F gt Fig 1 2 Boiler Layout The condensate is very slightly acidic about the same acidity as vinegar and should be piped in a plastic pipe It is not harmful to the waste disposal system and may be disposed
54. he gas pressure to the pre mix burner requires a special procedure outlined below which must be carried out a Purge the gas supply in accordance with BS 6891 b Vent the water system Important The Celsius heat exchanger consists of crossflow tubes which can trap an air pocket Great care must be taken to ensure that water flow has been established through the heat exchanger and thus ensuring no air pockets remain in the heat exchanger and pipe work Firing the boiler while an air pocket exists in the heat exchanger could damage it Turn the gas service cock to ON Turn on the electrical supply setting any external controls to call for heat e Set the boiler user control knob clockwise to the desired temperature setting The mains LED green will illuminate continuously After approx 10 seconds the boiler fan and pump will start on ignition rates After a few seconds the yellow Boiler ON LED will flash and a spark will light gas at the main burner provided all a9 Installation amp Servicing Instructions Page 19 4 6 4 7 4 8 WD209 1 2 h r 4 Commissionin The K n Celsius 2 25P air has been purged from the gas supply to the boiler When the burner is lit and the boiler is operating normally the yellow Boiler On LED will illuminate continuously and the four green modulation LEDs will show the output level the boiler has determined is necessary for the heating load If an air lock or other blockage is pr
55. k ff Ensure that the 22mm condensate pipe is not exposed to freezing conditions g Make sure that the exhaust pipe terminates away from windows or vents and is out of reach g Make sure that the air inlet and exhaust pipe outlets are at least 200mm apart Check tightness of all connections in the boiler before firing g Ensure that the terminals supplied are fitted to both the exhaust and air inlet pipes g The system must be free from air before firing g lf TRV s are installed on radiators ensure that a bypass is installed to maintain required flow g Complete the Gas Boiler Commissioning Checklist Service Interval Record Chapter 9 1 Complete the combustion testing Section 4 9 using a calibrated flue gas analyser WD210 1 2008 WD296 1 2008 KESTON Celsius 25 LPG CONVERSION INSTRUCTIONS FOR KESTON CELSIUS 25 MODEL The Keston Condensing Boiler CELSIUS 25 is supplied fabricated for Natural Gas combustion at a supply pressure of 20 mbar These conversion instructions must be read in conjunction with the Keston Condensing Boiler Installation amp Servicing Instructions WD209 To convert to LPG Commercial Propane you must carry out the following sequence Isolate the appliance Section 7 1 Gain access Section 7 2 Replace the NG gas valve part number C 08 3 02 00 1 with the LPG gas valve part number C 08 3 20 00 0 according to Section 7 4 9 Check the gas rate and combustion MANDATORY It is imp
56. luminated isolate the electrical supply verify safe isolation and re fit the fan speed jumper Restore the electrical supply and turn the boiler on via the fascia control knob At this point the boiler will fire up with just the first LED on The low fire flue gas reading should be 8 to 8 5 CO G20 DO NOT ADJUST ANY ADJUSTMENT SCREW 9 After the high then low fire adjustment has been made then the boiler must be returned to modulation operation Isolate the electrical supply verify safe isolation and remove the fan speed jumper Restore the electrical supply to the boiler and then turn the boiler on and off using the fascia control knob until there are no lower LEDs illuminated Isolate the electrical supply verify safe isolation and refit the jumper to the board refit boiler facia and case Restore the electrical supply to the boiler and hand over to the user Page2 WD297 1 2008 If following the above procedure combustion levels described above at both high and low rate could not be obtained please turn off the appliance and isolate the gas to the appliance Telephone KESTON BOILERS technical support phone no 0208 462 0262 v Note the original appliance serial number and production date on the old data badge vi Stick the new KC25 databadge C 08 1 00 01 0 Fig 5 7 4 item 3 into the appliance over the old data badge vii Indelibly mark the appliance serial number and production date on the new data badge viii Reassembl
57. ly to vent points and water flows readily to drain points i Draining taps must be located in accessible positions which permit the draining of the boiler and hot water storage vessel Draining taps should be at least 22 mm in nominal size and be in accordance with BS 2879 AIR VENT POINTS j These must be fitted at all high points where air will naturally collect and must be sited to allow complete draining of the system k Where thermal stores are to be used the thermal store supplier should be consulted as to the compatibility of the thermal store with a Keston Celsius 25 Thermal store units where the boiler directly heats an open vented thermal store are not suitable for use with the Celsius 25 Expansion Expansion Tank Pipe Minimum 9ft Height Celsius 25 28mm Minimum Figure2 7 1 Open Vented System Diagram 2 7 1 Open Vented Systems A typical system is shown in Figure 2 7 1 which includes a combined feed and vent Note that the combined feed and vent must be fitted to the primary RETURN A safety valve is specified for the primary flow to ensure discharge path at all times in the event the feed vent connection is isolated from the boiler flow see 2 7 2 i Note that the minimum static head required is 9 ft at the top of the boiler Although suitable for open vented systems with combined feed and vent arrangements the Celsius 25 is a low water content boiler As such any air entrainment withi
58. monoxide in the flue outlet from the boiler Over firing or under firing the burner will reduce the longevity of the appliance and may result in excessive carbon monoxide levels Carbon dioxide and carbon monoxide are colourless odourless gases produced by all combustion processes When the Keston condensing boiler is operating properly carbon dioxide CO3 levels will be between 8 amp 8 5 low rate and 8 5 amp 9 high rate and carbon oxide CO levels will be between 5 to 20 ppm low rate and 50 to 150 ppm high rate for natural gas For LP gas carbon dioxide CO3 levels will be between 8 9 amp 9 3 low rate and 9 5 amp 10 high rate and the carbon monoxide will be between 5 8 20 ppm low rate and 50 amp 150 ppm In any event the CO level at low rate must ALWAYS be less than CO levels at high rate To measure CO levels in the Keston boiler remove the 1 8 plug from the flue outlet pipe spigot Figure 5 7 4 item 19 Insert the probe of a calibrated combustion analysis meter and sample the gases as instructed in the test equipment s instructions When firing the boiler for the first time since installation the CO level at high rate may be between 100 220 ppm and between 50 80 ppm at low rate This is due to compounds used during manufacture curing within the combustion chamber On boilers which have been fired for more than one hour since installation the CO levels should not exceed 150 ppm at high rate and 50 ppm at low
59. mpliment an installation Terminal wall dealing collars are available to make good the external all face whilst working from the inside of the building using 50mm muPVC BS5255 and or BSEN1566 1 and BSEN1329 pipe or 75mm actual dimensions are int dia 68mm ext dia 78mm Keston Composite pipe Stand off frames are available to leave a 50mm gap behind the boiler to allow routing of pipes behind the boiler A sealed system kit is available to mount below the boiler as an extension to the cabinet and convert the boiler to a system boiler incorporating 8 litre expansion vessel and 3 bar safety valve Description Part Number Flue Terminal Wall Sealing Collar C 08 0 00 07 0 Air Terminal Wall Sealing Collar C 08 0 00 07 0 50 75 Flue Adapter C 17 2 00 60 0 Flue Outlet Terminal 75mm C 17 2 26 00 0 Air Inlet Terminal 75mm C 17 2 26 00 0 Sealed System Kit C 08 0 02 00 0 Stand Off Back Plate Boiler only C 08 0 03 00 0 Stand Off Back Plate Boiler Sealed System Kit C 08 0 05 00 0 Installation amp Servicing Instructions Page 4 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 8 25P 2 BOILER LOCATION All dimensions in mm 150 2 1 DIMENSIONS AND MINIMUM CLEARANCES The boiler must be installed in minimum clearances shown to allow subsequent servicing and safe operation However larger clearances may be required during installation 4 4 2 2 SERVICE CONNECTIONS Gas water air and flue pipe con
60. n neoprene plastic pipe between the venturi and gas valve should be in place sound Figure 1 Gas Inlet PTN Pagel WD297 1 2008 3 Turn off the boiler via the fascia control knob and electrically isolate the boiler Verify that the electrical supply has been isolated 4 The facia panel containing the on off knob should be removed via the four retaining screws Fascia PCB should have the electrical lead still connected and the knob left to the off position 5 Please be aware that some of the KC25 boilers are fitted with a plastic translucent moisture cover over the top of the gas valve this cover is held in place by a Phillips screw on the gas valve Prior to adjustment this shield should be removed 6 On the right hand board as you look at the boiler face on you will locate a small electrical bridging jumper attached to the board The jumper is red in colour approx 18mm in from the front edge and 12mm up from the bottom edge of the board see Figure 2 Figure 2 PCB Fan Speed Jumper 7 Please note The following procedure shall only be carried out by a trained and competent operative As the adjustment of the gas valve high and low fire adjustment screw must the indertaken with the appliance running precautions should be taken to avoid contact with any exposed electrical components and connections To set the high fire adjustment you will need to lock the boiler in this mode To achieve this you need to remove th
61. n the right hand board as you look at the boiler face on you will locate a small electrical bridging jumper attached to the board The jumper is red in colour approx 18mm in from the front edge and 12mm up from the bottom edge of the board see Figure 2 Installation amp Servicing Instructions Page 50 WD209 1 2000 QE na 7 Replacement Of Parts The Keston Celsius 25 amp 25P 7 Please note The following procedure shall only be carried out by a trained and competent operative As the adjustment of the gas valve high and low fire adjustment screw must the indertaken with the appliance running precautions should be taken to avoid contact with any exposed electrical components and connections To set the high fire adjustment you will need to lock the boiler in this mode To achieve this you need to remove the jumper from the board Then with the jumper removed restore power to the boiler Keeping your hands out of the appliance whilst the electrical supply is on turn the boiler on and off using the facia control knob On each operation of the knob to on then off will result in the illumination of one of the four lower green LEDs in succession High fire is denoted when the third lower green LED is illuminated At this point electrically isolate the boiler verify electrical isolation and then fit the jumper back in its original position restore power to the boiler and turn the boiler on using the control knob The boiler should go thro
62. n the system water will produce boiler kettling It is therefore Installation 8 Servicing Instructions Page 8 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 8 25P recommended if in any doubt to consider the use of sealed systems where possible Hose Union bib tap Celsius 25 Expansion a RETURN HEATING CIRCUIT Hosepipe disconnected Drain FLOW after filling Cock Safety Valve Double Check gt S Hose Valve SZ BS 10102 Connector 25 Stop Tap Test Cock Figure 2 7 2 Sealed System Diagram 2 7 2 Sealed Systems A sealed system kit option C 08 0 02 00 0 is available for S gt the Celsius 25 featuring 8 litre expansion vessel safety valve and connection manifold housed in a white casing which can be fixed to the base of the boiler The kit aso incorporates isolating valves on the flow return and gas pipes This allows y a R the system kit to also be used as a pre installation jig The KIT DIMENSIONS illustration below shows the dimensions of the kit wuGgZz Sealed systems must be designed in accordance with BS 5449 and BS 7074 Pt1 A typical sealed system is shown in Figure 2 7 2 It must include i A safety valve fitted on the flow adjacent to the boiler It must be non adjustable and preset to 3 bar A drain pipe must be attached at least as big as the valve connection and routed to drain in any area not hazardo
63. nected and the knob left to the off position 5 Please be aware that some of the C25 boilers are fitted with a plastic translucent moisture cover over the top of the gas valve this cover is held in place by a Phillips screw on the gas valve Prior to adjustment this shield should be removed 6 On the right hand board as you look at the boiler face on you will locate a small electrical bridging jumper attached to the board The jumper is red in colour approx 18mm in from the front edge and 12mm up from the bottom edge of the board see Figure 2 7 Please note The following procedure shall only be carried out by a trained and competent operative As the adjustment of the gas valve high and low fire adjustment screw must the indertaken with the appliance running precautions should be taken to avoid contact with any exposed electrical components and connections Figure 2 PCB Fan Speed Jumper To set the high fire adjustment you will need to lock the boiler in this mode To achieve this you need to remove the jumper from the board Then with the jumper removed restore power to the boiler Keeping your hands out of the appliance whilst the electrical supply is on turn the boiler on and off using the facia control knob On each operation of the knob to on then off will result in the illumination of one of the four lower green LEDs in succession High fire is denoted when the third lower green LED is illuminated At this point electric
64. new thermostat it is an advantage to smear a thin film of heat sink compound between the thermostat and plate This combined with fitting the new thermostat tightly to the plate ensures a good contact 7 4 5 Water Pressure Switch Fig 5 7 2 item 48 i Isolate the appliance Section 7 1 ii Shut off the water supply to the appliance iii Gain access Section 7 2 iv Drain the system to below the level of the appliance using the drain off tap at the base of the flow pipe from the heat exchanger v Remove the push on connectors from the water pressure switch taking note of the correct positions vi Unscrew the pressure switch vii Reassemble Section 7 3 NB Use a little jointing compound or PTFE tape on the thread viii Refill the system See Section 4 Commissioning 7 4 6 Ignition PCB Fig 5 7 1 item 100 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Remove the fascia plate by removing the four retaining screws Fig 5 7 1 items 112 and pull forward leaving to one side iv Remove the left hand side panel to the control boards housing by sliding forward v Pull off the multi pin connector and HT lead away from the board vi Slide the ignition PCB from the PCB housing vii Reassemble Section 7 3 7 4 7 Control PCB Fig 5 7 1 item 99 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Remove the fascia plate by removing the four retaining screws Fig 5 7 1
65. nnections to the fascia PCB If these are intact the fascia PCB should be replaced Y See mains lamp off section Turn user controls knob on Set external system controls to Call the boiler on ls the user control knob set to maximum ls the flow temperature and return temperature lt 72 C lt ls flow thermistor and return thermistor betw een N 0 5 kOhm and 20 kOhm Replace faulty thermistor See thermostat overheat Is lockout lamp red flashing Y section once every 2 seconds Continued on next page Installation amp Servicing Instructions Page 25 WD209 1 2000 eici 5 Fault Finding The Keston Celsius 25 amp 25P Continued from previous page lt Is lockout lamp red flashing twice every two seconds ls lockout lamp red flashing three times every two seconds Is lockout lamp red flashing our times every two seconds ls lockout lamp red flashing ive times every two seconds Is lockout lamp red flashing fifteen times then off for two seconds Replace control P See ignition failure sectio Is modulation LED1 illuminated Is the flow thermisto open circuit ls there open circuit across flow thermistor connections on contro PCB I Replace control PCB ls the static w ater pressure in the syste gt 0 2 bar Repressurise the syste or increase static head open vented systems See fan section of Ignition Lockout
66. of as normal waste water The flue gases are piped in a 50 mm muPVC BS5255 and or BSEN1566 1 and BSEN1329 plastic pipe or alternatively 75mm composite plastic to the outside The temperature of the flue gases are usually around 5 C above the temperature of the return water The flue pipe should be terminated outside the building from where they cannot re enter the building or any other adjacent building The heating level may be controlled by room thermostats hot water calorifier thermostats programmer time clocks and energy management systems The Celsius 25 features an integral frost protection function which will fire the boiler regardless of the external controls should the boiler temperature fall below 4 C The boiler will continue to fire until the boiler flow temperature exceeds 15 C This is to avoid damage to the boiler through freezing of boiler water The Celsius 25 features an integral pump fan exercise function which will run the fan and pump without firing the boiler for 5 seconds in the event the boiler is on standby for in excess of 24 hours without firing This is to help prevent seizing of fan and or pump due to long periods of inactivity 1 3 RELATED DOCUMENTS The Keston Celsius 25 Condensing Boiler must be installed in accordance with the current issue of the Gas Safety Installation and Use Regulations 1996 current IEE Wiring Regulations Building Regulations Building Standards Scotland Consolidation and the
67. of run L the minimum diameter of the horizontal hole D must be du 32 mm or ds 32 mm respectively assuming the pipe touches the wall at points T otherwise D will have to be increased by clearance from T See Section 3 4 3 Examples Examples a Wall Depth L 750 mm Unsocketed pipe du 56 mm Diameter hole D 56 750 1000 x 32 56 24 80 mm b Wall depth L 2 3m Socketed Pipe ds 65 mm Diameter Hole D u 65 2 3 x 32 65 73 5 138 5 mm c Measure cut and check the air and flue pipes to pass to the exit from the wall s or ceiling Always thoroughly deburr all pipes and most important remove shavings from within the pipe d Mount the boiler on the wall bracket and fix the flue and air spigots packed loose with the boiler and with appropriate gaskets to the boiler flue and air outlet connections the flue spigot incorporates a combustion test plug tightly to ensure there is no leakage Assemble using adhesive the pipework from the boiler connections to the exit from the first wall ceiling remount the boiler if removed When pushing pipe through walls ensure grit and dust is not allowed to enter the pipe Ensure pipes are fully engaged into sockets Connect the condensate drainage system and fill the condensate trap by pouring water down the boiler flue spigot See Section 3 5 Condensate Drainage Using the same methods drill any further holes always covering existing pipework cut and assemble
68. olate the boiler verify electrical isolation and then fit the jumper back in its original position restore power to the boiler and turn the boiler on using the control knob The boiler should go through its start up procedure and lock itself on high fire with all four LEDs illuminated The flue gas composition can now be tested via the flue spiggot test point A reading of 9 5 to 10 CO2 G31 should be present If the CO2 is not found to be within this range the gas valve high fire adjustment screw should be turned to achieve this figure This screw can be identified from this manual page 20 item number 8 in addition this screw is identified by the use of tamper paint on the screw head 8 After the high fire adjustment has been made checked isolate the electrical supply to the boiler verify safe isolation and remove the fan speed jumper again Restore the electrical supply to the boiler and then turn the boiler on and off using the fascia control knob Low fire position is confirmed when the second green LED is illuminated isolate the electrical supply verify safe isolation and re fit the fan speed jumper Restore the electrical supply and turn the boiler on via the fascia control knob At this point the boiler will fire up with just the first LED on The low fire flue gas reading should be 8 9 to 9 3 CO2 DO NOT ADJUST ANY ADJUSTMENT SCREW 9 After the high then low fire adjustment has been made then the boiler must be returned to modul
69. on Celsius 25 8 25P 5 4 FUNCTIONAL FLOW WIRING DIAGRAM a a O gt a Z uo Q x G J BK Y 1 5 CN10 m ous J Yo AAN J f of m l a NX ff OF Z cat Ot ao x ige OG m 4 o o gt o YA YAYA kaya u MU e 2 m 230VAC m o TO FR Do zZ Y 583 o x gt OF oOo wo n gt x z S z 6 S T A a 7 o G S 2 vt sd H e H o A a ie ZH z Tay o m a O ry LT z 3 g z 138 E KN 3 Lon 18 gt m L T 8 On Su 2 gt LO m gt x e a 2 F ra EE O a 20 x x ocr E o ar re 5 z 6 T z I 33 To lt Installation amp Servicing Instructions Page 3 0 The Keston Celsius 25 8 25P Chapter 5 Fault Finding M SILA A 13101A Jd NADE D A N33X9 M07 1454 ag N3399 a 3074 xa 30718 q33 doaz a osuapuoJ nna LN
70. op of the heat exchanger vi Reassemble Section 7 3 NB When reassembling inspect any gaskets for damage and replace if necessary 7 7 HEAT EXCHANGER Fig 5 7 2 item 34 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Shut of the water supply to the appliance iv Remove the burner Section 7 6 v Drain the system to below the level of the appliance using the drain off tap at the base of the boiler flow pipe vi Remove the flue protection thermostat Section 7 4 4 vii Remove the spark ignition flame detection electrode Section 7 5 viii Remove the flexible flue hose connection by slackening the retaining strap and pulling the hose of the heat exchanger spigot ix Remove the condensate trap hose Fig 5 7 2 item 55 by releasing the retaining clamp and pulling the hose away from the spigot at the base of the heat exchanger flue outlet box x Disconnect the flow and return pipe unions Fig 5 7 2 item 45 from the heat exchanger xi Remove the two allen bolts fixing the heat exchanger to the top mounting bracket Fig 5 7 2 item 72 xii Remove the heat exchanger xiii Reassemble Section 7 3 xiv Recommission Section 4 Commissioning Installation amp Servicing Instructions Page 43 WD209 1 2000 i 7 Replacement Of Parts The Keston Celsius 25 amp 25P 7 8 CONDENSATE TRAP Fig 5 7 2 item 57 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Disconnect
71. ormer Check for short circuits on control PCB and fan If OK replace fuse Rectify wiring Replace Control PCB Installation amp Servicing Instructions Page 27 WD209 1 2000 eici 5 Fault Finding The Keston Celsius 25 amp 25P IGNITION FAILURE ls there 230VAC betw een PL amp N and SL amp N at mains connection block e polarity of the permanent or sw itched live supply is reversed Rectify ls there at least 18 mbar dynamic pressure at the gas valves inlet Incorrect gas supply to boiler J ie when the boiler fires or Rectify attempts to fire Clear blockage and allow Is the condensate trap blocked contacts to dry ls modulation LED2 illuminated Is there 24VDC at fan onnection B on control PCB Reset lockout After up to 120 seconds does the fan run Replace fan iring from control PCB to fan unit faulty Replace control PCB No air flow ls the flue ai system correctly fitted and free of obstruction does the yellow boiler on lamp flash rapidly Rectify flue air syste Is the spark probe or HT ignition lead damaged ls there a spark ls there 230VAC at present control PCB D ls the spark gas 3 4 mm Replace ignition PCB Replace control PCB Set spark gap to 3mm ls there gas present Is the burner pressure land combustion set correctly SERVICE BOILER ls there 230VAC present at ignition PCB position E Replace ignition
72. ortant that the combustion at both high and low fire is checked and set when conducting any work on the combustion circuit especially gas valve replacement The procedure below details this setting using an electronic means of locking the boiler on high or low fire rate Where the instruction requires that the electrical supply to the appliance is isolated correct isolation procedures shall be followed Always verify safe electrical isolation before working on an appliance 1 Electrically isolate the appliance verify that the electrical supply has been isolated then removethe appliance case by first removing the securing screws at the top and bottom of the appliance 2 Once the casing has been removed keeping your hands away from exposed electrical components and connections switch the electrial power supply to the appliance back on Prior to commencing the adjustment procedure the boiler should be brought up to the normal working temperature a gas working pressure of at least 18mbar should be present at the gas inlet test nipple see Figure 1 and the thin neoprene plastic pipe between the venturi and gas valve should be in place sound Figure 1 Gas Inlet PTN Pagel WD296 1 2008 3 Turn off the boiler via the fascia control knob and electrically isolate the boiler Verify that the electrical supply has been isolated 4 The facia panel containing the on off knob should be removed via the four retaining screws Fascia PCB
73. p Servicing Instructions Page 20 WD209 1 2 h r 4 Commissionin The K n Celsius 2 25P The Keston Celsius 25 natural gas model when correctly set and operating at maximum rate should take 84 seconds for 2 cubic feet of natural gas and 148 seconds for 0 1 cubic metres of natural gas assuming 1038 btu h per cubic foot If the meter timing is found to be incorrect when the boiler is firing at maximum rate contact Keston Boilers Ltd for further guidance 4 9 COMBUSTION TESTING Although the gas pressure is preset at the factory it is required to assure proper combustion by measuring gas input and the level of carbon dioxide or oxygen and carbon monoxide in the flue outlet from the boiler Over firing or under firing the burner will reduce the longevity of the appliance and may result in excessive carbon monoxide levels To set the high low fire adjustment follow the procedure from Chapter 10 Carbon dioxide and carbon monoxide are colourless odourless gases produced by all combustion processes When the Keston condensing boiler is operating properly carbon dioxide CO levels will be between 8 amp 8 5 low rate and 8 5 amp 9 high rate and carbon oxide CO levels will be between 5 to 20 ppm low rate and 50 to 150 ppm high rate for natural gas For LP gas carbon dioxide CO levels will be between 8 9 amp 9 3 low rate and 9 5 amp 10 high rate and the carbon monoxide will be between 5 amp 20 ppm low rat
74. placed items are not broken up but are sealed within heavy duty polythene bags and clearly labelled as RCF waste RCF waste is classed as a stable non reactive hazardous waste and may be disposed at a landfill licensed to accept such waste Protective clothing is not required when handling these articles but we recommend you follow the normal hygiene rules of not smoking eating or drinking in the work area and always wash your hands before eating or drinking BENCHMARK INITIATIVE As part of the industry wide Benchmark initiative KC25 boiler enchmark manual includes Gas Boiler Commissioning Checklist Chapter I 9 This form should be completed by your installer at the end of the installation and commissioning process The details of the Checklist will be required in the event of any warranty work being required There is also Service Interval Record Chapter 9 to be completed after each annual service visit These forms Chapter 9 should be kept in a safe place for the life of the boiler CORGI INFORMATION The boiler should be installed and serviced only by CORGI registered operatives All CORGI registered Installers carry a CORGI ID card and have a registration number Both should be recorded in your boiler manual Chapter 9 GAS BOILER COMMISSIONING CHECKLIST You can check your installer by calling CORGI direct on 01256 372300 1 5 OPTIONAL ACCESSORIES A range of accessories are available from Keston Boilers Ltd to co
75. ply Bylaws for forced hot water heating systems Consideration must be given to pipe capabilities and pressure drop through the piping Water treatment must be carried out to BS 7593 Treatment of Water in Hot Water Central Heating Systems a The Celsius 25 is suitable for use on open vented water systems with combined feed and vent fitted to the boiler return b It is preferable for use on sealed water systems provided the appropriate components required see Section 2 7 2 Sealed Systems are included in the system c Any system must be thoroughly flushed clean of grease dirt and debris prior to connection with the boiler A trap may be installed in the flow line to collect any solder or other debris from the installation d All water systems must be constructed to comply with requirements of the Local Water Authority e Always use a system complying with the requirements of BS 5449 and BS 6798 Installation amp Servicing Instructions Page 7 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 amp 25P pa f System design must ensure an open circuit is always available to ensure circulation when the pump overrun function is operating after boiler shutdown g Copper tubing to BS 2871 Part 1 or barrier plastic pipe suitable to 110 C such as Unipipe is recommended h Jointing should be either with capillary threaded or compression fittings Pipes should have a gradient to ensure air is passed easi
76. rance mm Front Clearance for servicing mm Weight Full kg lbs Weight Empty kg lbs Flow and Return Connection Gas Connection Condensate Connection mm Celsius 25 Nat Gas G20 26 1 89 000 23 1 78 800 25 2 86 000 7 0 23 900 7 7 26 200 3 15 1 26 0 68 85 7 82 00 30 50 100 2 70 3 0 20 0 8 0 8 to 20 230V 50Hz 160 621 471 249 150 i 100 305 43 95 38 84 Rp 0 75 F Rp 0 5 F Celsius 25P LPG G31 25 0 85 300 22 7 77 500 24 8 84 600 6 8 23 300 7 45 25 400 4 60 1 84 0 313 39 5 3 0 37 0 14 8 8 to 20 230V 50Hz 160 621 471 249 150 b 100 305 43 95 38 84 Rp 0 75 F Rp 0 5 F 22mm plastic overflow 50mm muPVC BS5255 and or BSEN1566 1 and BSEN1329 Flue Pipe Size nominal bore mm in Air Intake Pipe Size nominal bore mm in Max Air Intake Length m Max Flue Outlet Length m Max Total Flue Outlet and Air Intake Length m Flue and Air Intake Material Flue Pipe Size nominal bore mm in Air Intake Pipe Size nominal bore mm in Max Air Intake Length m Max Flue Outlet Length m Max Total Flue Outlet and Air Intake Length m Type of Gas Optimum Flue Gas CO Level Destination Countries SEDBUK Efficiency G31 LPG 10 0 GB IE 50 2 50 2 39 20 40 75mm Keston Composite 75 3 75 3 117 60 120 G20 Natural Gas 8 4 GB IE 90 4 93 3 Installation amp
77. s of low mass and low water content and therefore responds faster when there Is a call for heat The Celsius 25 features full user diagnostics integral frost protection thermostat automatic pump and fan exercise in periods of inactivity anti cycle control dry fire protection and connections for remote lockout and run monitoring 1 2 BOILER SCHEMATIC Air is drawn into the boiler through a 50 mm muPVC BS5255 and or BSEN1566 1 and BSEN1329 plastic pipe or alternatively via a 75mm composite plastic pipe Gas is mixed with combustion air at the inlet to the fan The gas flow is automatically regulated by the gas valve according to the air flow generated by the fan The gas and air are thoroughly mixed in the blower and fed into the burner located at the top end of the heat exchanger module The gas and air mixture is ignited by a direct spark ignition control system and burns with a blue flame just off the surface of the burner As the hot products of combustion pass downwards they are cooled by exchanging heat with the circulating water which enters the heat exchanger at the bottom of the heat exchanger The optimum heat input is detected by monitoring flow and return temperatures and is adjusted by controlling the speed of the fan The optimum pump speed is also detected and automatically selected by the boiler When the return water temperature is below 55 C part of the water vapour in the combustion products will condense inside the heat exc
78. t E E wiring regulations and local regulations The method of connection to the mains electricity supply must facilitate complete electrical isolation of the boiler preferably by the use of a fused unswitched three pin plug and a shuttered socket outlet both complying with the requirements of BS 1363 There must be only one common method of isolation for the boiler and its control system Installation 8 Servicing Instructions Page 6 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 8 25P WAA y The appliance must be connected to the YA supply via a fused double pole switch having at least 3 mm 1 8 inch contact separation in both poles serving only the boiler and the system controls The connection point to the mains supply should be readily accessible and adjacent to the boiler except for rooms containing a bath or a shower Refer to section 2 3 Position 2 4 2 External Wiring 8 Controls 1 The boiler is designed so that all control wiring is external to the boiler 2 A programmer may be used with zone valves to give independent control of central heating and hot water 2 5 BOILER SIZE SELECTION The Celsius 25 will automatically adjust heat output and pump speed to match the system requirements at any given time Efficiency and combustion levels are maintained at optimum levels throughout the possible output range The Celsius 25 is therefore suitable for all systems with a total heat load within the maximum rang
79. t Of Water In Hot Water Central Heating Systems a Disconnect the boiler from the system at the flow and return connections and temporarily link the flow and return pipes on the system b Flush the entire system until clean water is discharged free from dirt flux solder etc The use of a flushing chemical is recommended e g Fernox Supafloc or equivalent Sludge and scale must be removed from an existing system Boiler failure due to system debris or sludge shall invalidate the guarantee c Connect the system to the boiler and fill in accordance with Section 2 7 Water Systems At this stage for sealed systems fill to a pressure of about 2 7 bar d Check the complete system for water soundness If leaks need to be rectified using flux and solder the system must be flushed cold again before proceeding e Reduce the pressure to the Initial System Design Pressure for sealed systems if applicable Vent the system 4 2 GAS SUPPLY The complete gas installation up to the boiler service cock must be checked for soundness BS 6891 4 3 ELECTRICAL INSTALLATION Carry out preliminary electrical safety checks i e Earth continuity Polarity Resistance to Earth Short Circuit using a suitable test meter 4 4 LP GAS The Keston Celsius 25 is supplied preset for the gas designated on the boiler packing No field conversion is possible LPG installations must use Celsius 25P models only 4 5 INITIAL FIRING Important Checking t
80. t is not possible to relight the boiler must be isolated and a Service Engineer called in to rectify the fault Advise that a reduction in the water pressure reading on the system gauge for sealed systems indicates a leak which should be rectified before further use Advise that the appliance should be serviced by a competent person at least once a year Advise on the frost protection and pump fan exercise feature Hand over User Instructions Complete all sections of the Chapter 9 Gas Boiler Commissioning Checklist that are relevant to the appliance installation The details will be required in the event of any warranty work g Advise the user that a plume of water vapour steam from the flue terminal is normal and that there is no need for concern Installation amp Servicing Instructions Page 21 WD209 1 2000 eure 5 Fault Finding The Keston Celsius 25 amp 25P 5 FAULT FINDING 5 1 ELECTRICAL CONTROL SEQUENCE When the external controls are calling for heat power will be fed to the boiler connection strip at terminals PL Permanent Live SL Switched Live and N Neutral If the user control knob is in the off position the green mains LED will flash rapidly If the user control knob is set to a temperature greater than the boiler flow temperature the green mains LED will be lit continuously Provided all temperature thermostats and pressure switches are closed the control PCB will initiate the following sequence
81. the condensate line from the base of the heat exchanger iv Disconnect the condense lines from the projection of the condensate trap from the base of the cabinet v Withdraw the condensate trap vi Mop up any spilled condensate vii Reassemble Section 7 3 NB When re fitting the condensate trap pour water onto the condensate hose from the base of the heat exchanger until nearly full Then reconnect the condensate hose to the base of the heat exchanger 79 PUMP Fig 5 7 2 item 52 i Isolate the appliance Section 7 1 ii Gain Access section 7 2 ili Isolate the waterways to the pump using the pump isolation valves Fig 5 7 2 item 51 iv Disconnect the pump electrical cable from the connections box of the pump head taking note of the correct position v Remove the four allen bolts securing the pump head to the pump back plate vi Remove the pump head vii If using a standard Grundfos UPS15 60 pump head as replacement a Remove the electrical cover to the new pump head b Remove the capacitor and link wire in the 8 way terminal block in the new pump head and discard viii Reassemble Section 7 3 Installation 8 Servicing Instructions Page 44 WD209 1 2000 eure 8 Spare Parts Listings The Keston Celsius 25 amp 25P 8 SHORT SPARE PARTS LIST item GC No Part Denomination Item GC No Part Denomination 32 Burner 43 Burner Gasket
82. the pipework From outside complete the two terminations See Section 2 8 Flue System and make good all holes Support any pipes whose route could be displaced either of its own accord or by accident Any horizontal run over 1m or vertical runs of any length must always be supported Brackets should be placed at intervals of approximately 1m Installation amp Servicing Instructions Page 16 Jou Flue ia WD209 1 2000 Chapter 3 Installation The Keston Celsius 25 8 25P 3 5 3 6 3 7 3 8 h Check all connections for security and re seal any joints using solvent cement where soundness may be in doubt Note Itis equally important to seal the air inlet with solvent cement as the flue outlet pipe joints CONDENSATE DRAINAGE Connect the condensate drainage system to the boiler It is advisable to use a detachable fitting at connection to the boiler to enable easy removal for servicing Fill the condensate trap by pouring water into the boiler flue spigot until water is seen to flow freely from the condensate drainage system Make the final connection of flue pipe to the boiler Details are provided in Chapter 2 Section 2 11 Condensate Drainage Connection 22 mm plastic pipe WATER SYSTEM Connect the flow and return pipework to the boiler Details of system requirements are given in Chapter 2 Section 2 7 Water Systems Connections 0 75 BSPF For optimum performance after installation this boiler and its
83. times every two seconds Installation amp Servicing Instructions Page 22 WD209 1 2000 Chapter 5 Fault Finding The Keston Celsius 25 amp 25P Any failure of the boiler to sequence in the above manner should be investigated using the following trouble shooting flow diagram Before attempting any electrical fault finding always carry out preliminary electrical system checks On completion of any service fault finding task which has required the breaking and remaking of electrical connections the checks earth continuity polarity short circuit resistance to earth must be repeated BOILER FASCIA DISPLAY O O Water Flow Rea OB O amp Boiler On Yellow OM O 86 Lockout Rea T a S s gt O O O Modulation Diagnostic 1 to 4 Green User Control Knob shown in off position Q Installation amp Servicing Instructions Page 23 WD209 1 2000 eici 5 Fault Finding The Keston Celsius 25 amp 25P QUICK REFERENCE ENGINEERS FAULT DISPLAY TABLE MAINS BOILER LOCKOUT OTHER FAULT DESCRIPTION GREEN ON RED LAMPS ACTION TO TAKE YELLOW OFF OFF OFF No power to boiler Check power supply Rapid Flash OFF OFF Boiler off on front Turn User Control Knob to On Slow Flash OFF OFF External controls not calling for heat ON OFF Flashing DIAG LED Flow Overheat Reset boiler off then on once every 2 1 ON via User Control Knob Check seconds circula
84. tion through system Check by pass fitted ON OFF Flashing DIAG LED Cabinet overheat Replace thermal once every 2 2 ON fuse link 82 C Check for heat leak seconds from gaskets Check pump and fan run on working OK when controls shut blr down ON OFF Flashing DIAG LED Flue Overheat Reset on stat Fire once every 2 3 ON boiler and check for actual flue seconds temperature ON OFF Flashing DIAG LED Should not occur This is a spare once every 2 4 ON sensor connection This fault display seconds indicates a fault on the wiring loom ON OFF Flashing DIAG LED Ignition failure The boiler has tried five twice every 2 1 ON times to fire and has not suceeded seconds Possible spark gap gas pressure flue air blockage condensate trap blocked faulty ignitor or faulty ignition pcb ON OFF Flashing DIAG LED Boiler lost flame whilst running Check twice every 2 2 ON condense trap for blockage flue air seconds blockage or bad combustion ON OFF Flashing 3 DIAG LED Flow thermistor not connected or times every 2 1 ON faulty seconds ON OFF Flashing 3 DIAG LED Return thermistor not connected or times every 2 2 ON faulty seconds ON OFF Flashing 4 Water pressure low Top up system times every 2 pressure if sealed system Check seconds boiler for leaks Advise customer ON OFF Flashing 5 Fan speed failure The fan speed has times every 2 dropped below 500 rpm Check fan seconds connections and
85. ugh its start up procedure and lock itself on high fire with all four LEDs illuminated The flue gas composition can now be tested via the flue spiggot test point A reading of 8 5 to 9 CO for natural gas G20 boilers should be present or 9 5 to 10 COz for LPG G31 If the COzis not found to be within this range the gas valve high fire adjustment screw should be turned to achieve this figure This screw can be identified from this manual page 20 item number 8 in addition this screw is identified by the use of tamper paint on the screw head 8 After the high fire adjustment has been made checked isolate the electrical supply to the boiler verify safe isolation and remove the fan speed jumper again Restore the electrical supply to the boiler and then turn the boiler on and off using the fascia control knob Low fire position is confirmed when the second green LED is illuminated isolate the electrical supply verify safe isolation and re fit the fan speed jumper Restore the electrical supply and turn the boiler on via the fascia control knob At this point the boiler will fire up with just the first LED on The low fire flue gas reading should be 8 to 8 5 CO gt z for natural gas or 8 9 to 9 3 CO for lpg DO NOT ADJUST ANY ADJUSTMENT SCREW 9 After the high then low fire adjustment has been made then the boiler must be returned to modulation operation Isolate the electrical supply verify safe isolation and remove the fan speed jump
86. us nor where it may be subject to freezing Installation amp Servicing Instructions Page 9 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 8 25P ii An expansion vessel complying with BS 4814 and sized in accordance with the requirements of BS 5449 and BS 7074 Pt 1 The vessel must be positioned on the primary return to the boiler iii A filling point in accordance with local water authority reguirements iv A method of system make up automatic or manual in accordance with local water authority requirements v There must be no permanent connection of mains water to the boiler system vi The installation must be designed to work with flow temperatures of up to 110 C All components of the system including the heat exchanger of the indirect cylinder must be suitable for a working pressure of 3 bar and a temperature of 110 C Care should be taken in making all connections that the risk of leakage is minimised 2 7 3 Hot Water System if applicable The hot water storage vessel must be of the indirect type certain direct cylinders can be used provided they are suitably adapted by fitting an immersion calorifier DIRECT CYLINDERS MUST NOT BE USED Further guidance is provided in BS 1394 It is advisable to fit a locksheild valve on the cylinder return to enable balancing of the flow rate through the cylinder The Keston Spa range of stainless steel unvented cylinders are an ideal option for use
87. ution 2 7 6 System Pump Selection if required The Celsius 25 features an integral circulating pump which has sufficient excess head to drive most domestic systems The available head is c 5kPa 0 5m If the system index circuit resistance is in excess of the available head from the integral pump an additional system pump will be required Installation amp Servicing Instructions Page 10 WD209 1 2000 Chapter 2 Boiler Connections The Keston Celsius 25 8 25P The schematic below illustrates a recommended approach to using an additional system pump The additional system pump should be sized to overcome the index circuit resistance only as the boilers integral pump will overcome boiler resistance Celsius 25 Safely Additional system A Primary flow Expansion Permanently Vessel open by pass Primary Return If an additional pump is required the selected pump must comply with BS 1394 2 8 FLUE SYSTEM 2 8 1 Design Individual air supply and flue outlet pipes are used The material used for flue outlet 8 or air inlet must be muPVC to BS 5255 and or BSEN1566 1 and BSEN1329 of an internal diameter of 51 mm i e nominal 50 mm diameter muPVC solvent weld waste pipe Alternatively where flue or air intake lengths of up tu 60m are required Glynwed Friatec DN70 pipe may be used Both 50mm flue outlet terminal and 50mm air inlet terminal are supplied and are illustrated in Figure 2 8 1 Both terminals are identical
88. with the Keston Celsius 25 The Keston Spa range combine exceptional recovery times with durable long life stainless steel construction and all associated controls Contact Keston Boilers Ltd for information 2 7 4 Boiler By pass Piping Boiler water flows are critical to the operation of the boiler If flow cannot be maintained through the system piping to meet the minimums required by the boiler insufficient water flows through the boiler will cause the boiler to kettle or even produce steam which can damage the heat exchanger and will invalidate the heat exchanger warranty In addition an open circuit is required after boiler shutdown to permit circulation during the boilers 2 minute pump overrun sequence It is normally advisable to incorporate a boiler by pass in the system especially if thermostatic radiator valves are used The flow return differential should be 10 C to 15 C 2 7 5 Air Elimination In the initial charge of water to the boiler system and in all subsequent additions of water to the system some air will be dissolved in the water As the water is heated the air is driven out of the solution and will collect in high spots in the system These air bubbles can interfere with pumping and heat transfer and must be eliminated Installation of air bleed valves at the high spot s in the system will allow for air elimination when filling the system and will allow re venting in a day or so after all air has been driven out of sol
89. xing venturi from the gas valve by unscrewing the BSP nipple between the two ix Reassemble Section 7 3 x Check the gas rate See Section 4 Commissioning 7 5 SPARK IGNITION FLAME DETECTION ELECTRODE Fig 5 7 2 item 31 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Remove the fascia plate by removing the four retaining screws Fig 5 7 1 items 112 and pull forward leaving to one side iv Remove the left hand side panel to the control boards housing by sliding forward v Remove the pull off HT lead to the ignition PCB Fig 5 7 1 item 100 vi Remove the pull off HT lead to the spark ignition electrode vii Undo the screws to the spark ignition electrode flange located on the heat exchanger side panel and withdraw the spark ignition electrode viii Reassemble Section 7 3 NB When reassembling inspect the gasket for damage and replace if necessary With the new spark ignition electrode in place it is essential to ensure the gap between the tip of the electrode and the earth post is 3 mm Distances above or below 3 mm will affect ignition performance If necessary gently bend the electrode taking care not to damage the ceramic insulator 7 6 BURNER Fig 5 7 2 items 32 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Remove the combustion blower Section 7 4 9 iv Remove the 10 nuts fixing the burner to the top of the heat exchanger v Withdraw the burner from the t

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