WD209/1/2000 The Keston Celsius 25 & 25P Fan Powered High Efficiency Modulating Domestic Condensing Gas Boiler Installation And Servicing Instructions Celsius 25 & 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. 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.
WD209/1/2000 The Keston Celsius 25 & 25P CONTENTS Section 1 Description 1.1 1.2 1.3 1.4 1.5 GENERAL INSTRUCTION Description Boiler Schematic Related Documents Performance Data Optional Accessories 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 BOILER LOCATION Dimensions & Minimum Clearances Service Connections Position Electrical Boiler Size Selection Gas Supply Water Systems Flue System Air Supply Compartment Installation Condensate Drainage 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.
WD209/1/2000 The Keston Celsius 25 & 25P 4.8 4.9 4.10 Timing The Gas Meter Combustion Testing Handing Over To The User 5.1 5.2 5.3 5.4 5.5 5.6 5.7 FAULT FINDING Electrical Control Sequence Fault Finding Flow Chart - General Fault Finding Flow Chart - Detailed Functional Flow Wiring Diagram Electrical Wiring Diagram Illustrated Wiring Diagram Exploded Assembly Diagrams 6.1 6.2 SERVICING Pre Service Checks Recommended Routine Service 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.
WD209/1/2000 Chapter 1 : General Instruction The Keston Celsius 25 & 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).
WD209/1/2000 Chapter 1 : General Instruction The Keston Celsius 25 & 25P 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 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.
WD209/1/2000 Chapter 1 : General Instruction BS 7593 The Keston Celsius 25 & 25P Treatment of Water in Hot Water Central Heating Systems 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 Max. Input (Gross CV) Max. Output To Water (80/60C Flow/Return) (50/30C Flow/Return) Min.
WD209/1/2000 Chapter 1 : General Instruction The Keston Celsius 25 & 25P *) 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.
WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 25P 2. BOILER LOCATION All dimensions in mm. 150 2.1 2.2 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. 1 1 SERVICE CONNECTIONS Gas, water, air and flue pipe, condensation, and electrical connections are as shown. Gas : 0.5 inch BSP female. Flow/Return 0.75 inch BSP female.
WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 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 appliance 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.
WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 25P The appliance must be connected to the 3A 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 & Controls 1.
WD209/1/2000 f g h i j k. Chapter 2 - Boiler Connections The Keston Celsius 25 & 25P System design must ensure an open circuit is always available to ensure circulation when the pump overrun function is operating after boiler shutdown. Copper tubing to BS 2871 Part 1 or barrier plastic pipe suitable to 110OC, such as Unipipe, is recommended. Jointing should be either with capillary, threaded or compression fittings.
WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 25P recommended, if in any doubt, to consider the use of sealed systems where possible. Air Vent Hose Union bib tap Celsius 25 Expansion Vessel L/S RETURN By-pass Bal. Valve Drain Cock Hosepipe ( disconnected after filling ) HEATING CIRCUIT FLOW Safety Valve Double Check Valve Test Cock Hose Connector BS 1010:2 Stop Tap Figure 2.7.2 : Sealed System Diagram 2.7.2 Sealed Systems 25 0m m 275mm A sealed system kit option (C.
WD209/1/2000 Chapter 2 - Boiler Connections (ii) (iii) (iv) (v) (vi) The Keston Celsius 25 & 25P 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. A filling point, in accordance with local water authority requirements. A method of system make-up (automatic or manual), in accordance with local water authority requirements.
WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 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 Safety Valve Additional system pump.
WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 25P Flue outlet uses one 92.5o sweep elbow. Hence, maximum length permissible (i.e. c+d in figure 2.8.2 = 20.0m - 1.0 m = 19.0m FLUE AIR a d b c Celsius 25 Figure 2.8.2 : Flue & Air Maximum Length Example Slope 'Horizontal' flue outlet pipework MUST slope at least 2 degrees (32 mm per metre run) downwards towards the boiler. Pipework can be vertical. Only swept elbows can be used.
WD209/1/2000 Chapter 2 - Boiler Connections Dimensions (mm) A Below or beside openable window, air brick, etc. The Keston Celsius 25 & 25P Flue Terminal Air Inlet 300 50 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 1,200 1,200 J From opening in a car port.
WD209/1/2000 2.10 Chapter 2 - Boiler Connections The Keston Celsius 25 & 25P 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 of air vent High Low Air from room 306 cm2 306 cm2 Air direct from Outside 153cm2 153cm2 Both vents must communicate to the same room or be on the same wall to outside. 2.
WD209/1/2000 Chapter 3 : Installation The Keston Celsius 25 & 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.
WD209/1/2000 3.4.1 Chapter 3 : Installation Diameter of holes. i) Allowance must be made for socketed lengths if these are to be passed through the holes : du ds ii) 3.4.2 3.4.3 The Keston Celsius 25 & 25P = unsocketed = diameter = socketed = diameter 56mm 65mm Examples a. Wall Depth Unsocketed pipe Diameter hole c. du D For 'horizontal' runs of flue pipe the holes must either be oversized or cut at a 2o slope (the latter may be difficult on long holes).
WD209/1/2000 Chapter 3 : Installation The Keston Celsius 25 & 25P h. Note: 3.5 Check all connections for security and re-seal any joints using solvent cement where soundness may be in doubt. It is 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.
WD209/1/2000 Chapter 3 : Installation N - PL - The Keston Celsius 25 & 25P Blue wire (Neutral) for 3A permanent and 2A switched supplies Brown wire (Live) 3A permanent supply Yellow/Green Wire (Earth) SL Brown wire (Live) 2A switched supply.
WD209/1/2000 Chapter 4 : Commissioning The Keston Celsius 25 & 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.
WD209/1/2000 f. Chapter 4 : Commissioning The Keston Celsius 25 & 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 present the unit may go to overheat or water pressure lockout.
WD209/1/2000 Chapter 4 : Commissioning The Keston Celsius 25 & 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.
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 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.
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P Any failure of the boiler to sequence in the above manner should be investigated using the following trouble shooting flow diagram. Water Flow (Red) Lockout (Red) Boiler On (Yellow) Mains (Green) Before attempting any electrical fault finding, always carry out preliminary electrical system checks.
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P QUICK REFERENCE ENGINEERS FAULT DISPLAY TABLE MAINS (GREEN) BOILER ON (YELLOW) LOCKOUT (RED) OTHER LAMPS OFF OFF OFF - Rapid Flash OFF OFF - Slow Flash ON OFF OFF OFF Flashing once every 2 seconds DIAG LED 1 ON ON OFF Flashing once every 2 seconds DIAG LED 2 ON ON OFF DIAG LED 3 ON ON OFF ON OFF Flashing once every 2 seconds Flashing once every 2 seconds Flashing twice every 2 seconds ON OFF DIAG LED 2 ON ON
WD209/1/2000 5.2 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P 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) A signal 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.
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P Continued from previous page N Is lockout lamp (red) flashing tw ice every tw o seconds? Y See ignition failure section N Is lockout lamp (red) flashing three times every tw o seconds? Is modulation LED1 illuminated? Y Is modulation LED2 illuminated? Y Replace flow thermistor? Is the return thermistor open circuit? Y Wiring betw een flow thermistor and control PCB faulty? Is there open circuit across return thermistor connecti
WD209/1/2000 5.3 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P Fault Finding Flow Chart - Detailed MAINS LED OFF Is the boiler supply fuse OK? N Replace with 3A Fuse Y Is there 230VAC at PL connection at main connection block (K)? N No mains supply to boiler. Y Is there 230VAC at mains input connection to control PCB (L)? Wiring from connection block to control PCB faulty.
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P IGNITION FAILURE Is there 230VAC betw een PL & N and SL & N at mains connection block.? The polarity of the permanent or sw itched live supply is reversed. Rectify N Y Is there at least 18 mbar dynamic pressure at the gas valves inlet (ie w hen the boiler fires or attempts to fire)? Incorrect gas supply to boiler. Rectify N Y Clear blockage and allow contacts to dry.
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P THERMOSTAT OVERHEAT Is modulation LED1 lit? Y Is flow overheat thermostat open circuit when flow temperature is < 60OC? Y Replace flow overheat thermostat. N N Check system for blockage and/or air lock. Reset lockout by turning user knob off then on. Check pump is operating. Is modulation LED2 lit? Y Replace cabinet thermal fuse and check all combustion area joints for leaks.
G R B P 7 1 Y Y D 13 4 1 CN5 1 5 H Y R B Flow Return Thermistor Thermistor UPR 15-60 Pump G R Flue Stat Cab. Stat Flow Stat M BK BK R B B 1 7 R 24VAC LWPS 7 BK BK CN4 L 1 230VAC GR J 1 R CN11 Transformer N E G C C Chapter 5 : Fault Finding J 4 CN1 Y I Q Q 1 CN3 5 I CN9 CN10 CN2 PL N E SL SL (Link) LO RUN FUNCTIONAL FLOW WIRING DIAGRAM B WD209/1/2000 5.
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WD209/1/2000 5.7 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P Exploded Assembly Diagrams 5.7.
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WD209/1/2000 5.7.5 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P Exploded Diagrams Parts Reference List Boiler Controls Assembly (Fig. 5.7.1) GC Number Code 100 99 98 107 106 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) Waterway, Condensate & Flue Assembly (Fig. 5.7.2) GC Number Code Description 34 Heat Exchanger (C.08.2.18.00.0) 32 Burner (C.08.2.32.00.
WD209/1/2000 Chapter 6 : Servicing The Keston Celsius 25 & 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 qualified persons.
WD209/1/2000 h. i. j. k. l. m. n. Chapter 6 : Servicing The Keston Celsius 25 & 25P Turn on the electrical supply to the boiler and allow the boiler to reach operating temperature levels. Recheck the burner pressure by following the procedure detailed in Section 4.7 Remove the combustion test point plug from the flue pipe. This is situated on the flue spigot out of the cabinet. Carry the full procedure detailed in section 4.9 COMBUSTION TESTING MANDATORY Replace the combustion test point plug.
WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 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 & RETURN THERMISTORS 7.4.3 CABINET TEMPERATURE SENSOR 7.4.4 FLOW OVERHEAT THERMOSTAT & 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.
WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 25P 7.0 GENERAL The following must always be carried out by a competent/qualified person. 7.1 PRECAUTIONS i) Always switch off 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.
WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 25P iii) 7.4.5 7.4.6 7.4.7 7.4.8 7.4.9 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 new thermostat it is an advantage to smear a thin film of heat sink compound between the thermostat and plate.
WD209/1/2000 Chapter 7 : Replacement Of Parts vi) vii) viii) ix) x) The Keston Celsius 25 & 25P 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 (See Section 4 - Commissioning) 7.5 SPARK IGNITION/FLAME DETECTION ELECTRODE (Fig. 5.7.
WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 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 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.
WD209/1/2000 Chapter 8 : Spare Parts Listings The Keston Celsius 25 & 25P 8.
WD209/1/2000 Item GC No Chapter 8 : Spare Parts Listings Part Denomination Item 100 Ignition PCB 99 98 Fascia PCB Installation & Servicing Instructions The Keston Celsius 25 & 25P GC No Part Denomination Control PCB Page : 46
WD209/1/2000 Chapter 8 : Spare Parts Listings The Keston Celsius 25 & 25P SHORT SPARE PARTS LIST FOR THE KESTON CONDENSING BOILER RANGE Item GC No 47 48 121 46 99 100 98 103 78 80 80 57 31 32 34 52 - Installation & Servicing Instructions 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 Elect
WD209/1/2000 Chapter 9 : Benchmark Checklist Final The Keston Celsius 25 & 25P 9. GAS BOILER COMMISSIONING CHECKLIST BENCHMARK No. GAS BOILER COMMISSIONING CHECKLIST BOILER SERIAL No. ___________________ NOTIFICATION No.
WD209/1/2000 Chapter 9 : Benchmark Checklist Final The Keston Celsius 25 & 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.
WD209/1/2000 Chapter 10 : Setting Procedure The Keston Celsius 25 & 25P 10. HIGH & 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.
WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 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.
KESTON CONDENSING BOILERS IMPORTANT CELSIUS 25 & 25P INSTALLATION KEY POINTS † † † † † † † † † † † † † † † Read Installation Manual Carefully 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). Ensure that ALL dust particles, filings , plastic chips etc. are removed from the inlet pipe. If the installation is a replacement the system must be flushed clean.
WD296/1/2008 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 & Servicing Instructions - WD209. To convert to LPG (Commercial Propane) you must carry out the following sequence: i) ii) iii) Iv) Isolate the appliance (Section 7.1) Gain access (Section 7.
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 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.
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) vi) vii) viii) Note the original appliance serial number and production date on the old data badge. 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.
WD297/1/2008 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 Boiler Installation & Servicing Instructions - WD209. To convert to NG (Natural Gas) you must carry out the following sequence: i) ii) iii) Iv) Isolate the appliance (Section 7.1) Gain access (Section 7.
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.
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) vi) vii) viii) Note the original appliance serial number and production date on the old data badge. 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.
WD485/0/2008 CELSIUS 25 & 25P Gas valve replacement procedure for KESTON CELSIUS 25 & 25P boilers These replacement instructions must be read in conjunction with the Keston CELSIUS 25 & 25P Installation & 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.
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.
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.
