Keston Celsius 25 Installation And Servicing Instructions
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Keston Celsius 25 Installation And Servicing Instructions

Fan powered high efficiency modulating domestic condensing gas boiler
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WD209/1/2000
Fan Powered High Efficiency
Modulating Domestic Condensing Gas Boiler

Installation And Servicing Instructions

These instructions must be left either with
the user or next to the site gas meter.
email : info@keston.co.uk web : www.keston.co.uk
Celsius 25 & 25P Models
CE/PI No : 87BL49
GC No : 41-930-06
34 West Common Road
Hayes, Bromley, Kent BR2 7BX
Tel. +44 (0)20 8462 0262 Fax. +44 (0)20 8462 4459
The Keston Celsius 25 & 25P

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Summary of Contents for Keston Celsius 25

  • Page 1: Installation And Servicing Instructions

    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.

  • Page 2: Table Of Contents

    WD209/1/2000 The Keston Celsius 25 & 25P CONTENTS Section Description GENERAL INSTRUCTION Description Boiler Schematic Related Documents Performance Data Optional Accessories BOILER LOCATION Dimensions & Minimum Clearances Service Connections Position Electrical Boiler Size Selection Gas Supply Water Systems Flue System Air Supply 2.10...
  • Page 3 WD209/1/2000 The Keston Celsius 25 & 25P Timing The Gas Meter Combustion Testing 4.10 Handing Over To The User FAULT FINDING Electrical Control Sequence Fault Finding Flow Chart - General Fault Finding Flow Chart - Detailed Functional Flow Wiring Diagram...

  • Page 4: Description

    While the application for which the Celsius 25 was designed is the same 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.

  • Page 5: Related Documents

    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.

  • Page 6: Performance Data

    WD209/1/2000 Chapter 1 : General Instruction The Keston Celsius 25 & 25P BS 7593 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'.

  • Page 7: Optional Accessories

    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.

  • Page 8: Dimensions & Minimum Clearances

    See Section 1.5 - Air Intake Optional Accessories. Flue POSITION The Celsius 25 is not suitable for external installation. The boiler may be installed in any room or internal space, although particular attention is drawn to...
  • Page 9 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.

  • Page 10: Boiler Size Selection

    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 range of the boiler.
  • Page 11 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.
  • Page 12 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 RETURN By-pass Bal. HEATING CIRCUIT...
  • Page 13 The Keston Spa range of stainless steel unvented cylinders are an ideal option for use with the Keston Celsius 25. The Keston Spa range combine exceptional recovery times with durable, long life stainless steel construction and all associated controls.

  • Page 14: Flue System

    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.
  • Page 15 WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 25P 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 FLUE Celsius 25 Figure 2.8.2 : Flue & Air Maximum Length Example 2.8.3...
  • Page 16 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 & Servicing Instructions...

  • Page 17: Compartment Installation

    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.

  • Page 18: Wall Mounting Bracket

    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.

  • Page 19: Condensate Drainage

    WD209/1/2000 Chapter 3 : Installation The Keston Celsius 25 & 25P 3.4.1 Diameter of holes. Allowance must be made for socketed lengths if these are to be passed through the holes : = unsocketed = 56mm diameter = socketed 65mm...

  • Page 20: Water System

    WD209/1/2000 Chapter 3 : Installation The Keston Celsius 25 & 25P Check all connections for security and re-seal any joints using solvent cement where soundness may be in doubt. Note: It is equally important to seal the air inlet with solvent cement as the flue outlet pipe joints.

  • Page 21: Exchanging A Boiler

    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...

  • Page 22: Initial Flushing

    Earth, Short Circuit using a suitable test meter. 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. INITIAL FIRING...
  • Page 23 WD209/1/2000 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.
  • Page 24 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).
  • Page 25 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P 5. FAULT FINDING 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.
  • Page 26 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. Before attempting any electrical fault finding, always carry out preliminary electrical system checks.
  • Page 27 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P QUICK REFERENCE ENGINEERS FAULT DISPLAY TABLE MAINS BOILER LOCKOUT OTHER FAULT DESCRIPTION (GREEN) (RED) LAMPS ACTION TO TAKE (YELLOW) No power to boiler. Check power supply. Rapid Flash Boiler off on front.
  • Page 28 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.
  • Page 29 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P Continued from previous page Is lockout lamp (red) flashing See ignition failure section tw ice every tw o seconds? Is lockout lamp (red) flashing Is modulation LED1 Is modulation LED2...
  • Page 30 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P Fault Finding Flow Chart - Detailed MAINS LED OFF Is the boiler supply fuse Replace with 3A Fuse Is there 230VAC at PL No mains supply to connection at main boiler.
  • Page 31 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P IGNITION FAILURE Is there 230VAC betw een PL & N The polarity of the permanent or sw itched and SL & N at mains connection block.? live supply is reversed. Rectify...
  • Page 32 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P THERMOSTAT OVERHEAT Is flow overheat thermostat Replace flow overheat Is modulation LED1 lit? open circuit when flow thermostat. temperature is < 60 Check system for blockage and/or air lock. Reset lockout by turning user knob off then on.
  • Page 33 CONTROL PCB SL (Link) CN11 I Q Q Y R B LWPS 15-60 Flow Return Pump Thermistor Thermistor Transformer Flue Cab. Flow Stat Stat Stat Fascia PCB Ignition PCB Valve Condensate Trap...
  • Page 34 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P ELECTRICAL WIRING DIAGRAM Installation & Servicing Instructions Page : 31...
  • Page 35 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P ILLUSTRATED WIRING DIAGRAM Installation & Servicing Instructions Page : 32...
  • Page 36 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P Exploded Assembly Diagrams 5.7.1 Boiler Controls Assembly Installation & Servicing Instructions Page : 33...
  • Page 37 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P 5.7.2 Waterway, Condensate & Flue Assembly Installation & Servicing Instructions Page : 34...
  • Page 38 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P 5.7.3 Air - Gas Assembly Installation & Servicing Instructions Page : 35...
  • Page 39 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P 5.7.4 Casing Assembly Installation & Servicing Instructions Page : 36...
  • Page 40 WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25P 5.7.5 Exploded Diagrams Parts Reference List Boiler Controls Assembly (Fig. 5.7.1) GC Number Code 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 &...
  • Page 41 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.
  • Page 42 WD209/1/2000 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.
  • Page 43 WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 25P 7. REPLACEMENT OF PARTS INDEX GENERAL PRECAUTIONS ACCESS PROCEDURES - GENERAL 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...
  • Page 44 WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 25P GENERAL The following must always be carried out by a competent/qualified person. PRECAUTIONS 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.) Gain access to the appliance (Section 7.2) and turn off the gas supply at the...
  • Page 45 WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 25P iii) Remove the push on connectors from the thermostat taking note of the correct positions. Unscrew the two retaining screws, or nuts, and remove the thermostat. Reassemble (Section 7.3)
  • Page 46 WD209/1/2000 Chapter 7 : Replacement Of Parts 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). vii) Remove the gas valve and mixing venturi as one.
  • Page 47 WD209/1/2000 Chapter 7 : Replacement Of Parts The Keston Celsius 25 & 25P CONDENSATE TRAP (Fig. 5.7.2 item 57) Isolate the appliance (Section 7.1) Gain access (Section 7.2) iii) Disconnect the condensate line from the base of the heat exchanger.
  • Page 48 WD209/1/2000 Chapter 8 : Spare Parts Listings The Keston Celsius 25 & 25P 8. SHORT SPARE PARTS LIST Item GC No Part Denomination Item GC No Part Denomination Burner Burner Gasket Ignitor Gasket Ignitor/Sensor Probe Flow/Return Flue Protection Thermistors Thermostat...
  • Page 49 WD209/1/2000 Chapter 8 : Spare Parts Listings The Keston Celsius 25 & 25P Item GC No Part Denomination Item GC No Part Denomination Ignition PCB Control PCB Fascia PCB Installation & Servicing Instructions Page : 46...
  • Page 50 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 Part Denomination Flow/Return Temperature Thermistor Water Pressure Switch Flow Overheat Thermostat Flue Protection Thermostat...
  • Page 51 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. ____________________ CONTROLS To comply with the Building Regulation, each section must have a tick in one or other of the boxes TIME &...

  • Page 52: Service Interval Record

    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.
  • Page 53 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.
  • Page 54 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 &...
  • Page 55 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).
  • Page 56 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 &...
  • Page 57 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.
  • Page 58 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) Note the original appliance serial number and production date on the old data badge.
  • Page 59 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 &...
  • Page 60 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.
  • Page 61 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) Note the original appliance serial number and production date on the old data badge.
  • Page 62 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.
  • Page 63 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.
  • Page 64 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)

This manual is also suitable for:

Celsius 25p

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