Fan Powered High Efficiency Modulating Domestic Condensing Gas BoilerInstallation And Servicing InstructionsCelsius 25 & 25P ModelsCE/PI No : 87BL
The appliance must be connected to the 3A supply via a fused double-pole switchhaving at least 3 mm (1/8 inch) contact separation in both poles, servi
f System design must ensure an open circuit is always available to ensurecirculation when the pump overrun function is operating after boil
recommended, if in any doubt, to consider the use of sealed systems wherepossible.2.7.2 Sealed SystemsA sealed system kit option(C.08.
(ii) An expansion vessel complying with BS 4814 and sized in accordancewith the requirements of BS 5449 and BS 7074 Pt 1. The vessel must be
The schematic below illustrates a recommended approach to using an additionalsystem pump. The additional system pump should be sized to over
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 = 19.0m2.8.3 Slope'Horizontal&
Table 2.8.4 Minimum Flue Terminations & Air Inlet DimensionsThe flue outlet terminal is designed to face outwards but can, if desired,
2.10 COMPARTMENT INSTALLATIONDue consideration should be given to BS5440 pt 1 with regard to compartment ventilationrequirements. High and low level v
3. INSTALLATION OF THE BOILERRead Chapter 2 - Boiler Location and decide upon the position of the boiler.Installation of the boiler is straightforward
3.4.1 Diameter of holes.i) Allowance must be made for socketedlengths if these are to be passed throughthe holes :du = unsocketed = 56mmdiamete
CONTENTSSection Description1 GENERAL INSTRUCTION1.1 Description1.2 Boiler Schematic1.3 Related Documents1.4 Performance Data1.5 Optional Accessories2
h. Check all connections for security and re-seal any joints using solventcement where soundness may be in doubt.Note: It is equally impo
N - Blue wire (Neutral) for 3A permanent and 2A switchedsuppliesPL - Brown wire (Live) 3A permanent supply- Yellow/Green Wire (Earth)SL - Brow
4. COMMISSIONING OF THE BOILERImportant:This condensing boiler contains components which could be damaged or blocked by grease, dirt,solder etc., fr
air has been purged from the gas supply to the boiler. When the burner is lit andthe boiler is operating normally the yellow Boiler On LED will illumi
The Keston Celsius 25 (natural gas model), when correctly set and operating at maximumrate, should take 84 seconds for 2 cubic feet of natural gas and
5. FAULT FINDING5.1 ELECTRICAL CONTROL SEQUENCEWhen the external controls are calling for heat, power will be fed to the boiler connectionstrip at
Any failure of the boiler to sequence in the above manner should be investigated using thefollowing trouble shooting flow diagram.Before attempting an
QUICK REFERENCEENGINEERS FAULT DISPLAY TABLEFan pcb faulty. - Replace-FlashingconstantlyOFFONFan speed failure. The fan speed hasdropped below 500 rpm
5.2 FAULT FINDING FLOW CHART - GENERAL WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 26Is lockout lamp (red) fla
4.8 Timing The Gas Meter4.9 Combustion Testing4.10 Handing Over To The User5 FAULT FINDING5.1 Electrical Control Sequence5.2 Fault Finding Flow Chart
5.3 Fault Finding Flow Chart - DetailedWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 28IGNITION FAILUREIs there
WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 29Is modulation LED1 lit?Is
5.4 FUNCTIONAL FLOW WIRING DIAGRAMWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Pa
5.5 ELECTRICAL WIRING DIAGRAMWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page :
5.6 ILLUSTRATED WIRING DIAGRAMWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page :
5.7 Exploded Assembly Diagrams5.7.1 Boiler Controls Assembly WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation &
5.7.2 Waterway, Condensate & Flue Assembly WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing In
5.7.3 Air - Gas AssemblyWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 35
5.7.4 Casing AssemblyWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 36
1. GENERAL INSTRUCTION1.1 DESCRIPTIONThe Celsius 25 is unique in its concept and design. It comprises a high efficiency stainlesssteel heat exchanger
5.7.5 Exploded Diagrams Parts Reference ListBoiler Controls Assembly (Fig. 5.7.1)GC Number Code Description100 Ignition PCB (C.08.4.04.00.3)99 Contro
6. ROUTINE (ANNUAL) SERVICINGTo ensure the continued safe and efficient operation of the boiler it is necessary to carry outroutine se
h. Turn on the electrical supply to the boiler and allow the boiler to reach operatingtemperature levels.i. Recheck the burner pressure by following t
7. REPLACEMENT OF PARTSINDEX7.0 GENERAL7.1 PRECAUTIONS7.2 ACCESS7.3 PROCEDURES - GENERAL7.4 ELECTRICAL7.4.1 FASCIA PCB7.4.2 BOILER FLOW & RETURN T
7.0 GENERALThe following must always be carried out by a competent/qualified person.7.1 PRECAUTIONSi) Always switch off the mains electricity supply a
iii) Remove the push on connectors from the thermostat taking note of thecorrect positions.iv) Unscrew the two retaining screws, or nuts, and remove t
vi) Undo the four bolts fixing the mixing venturi (fig 5.7.3 item 81) to theventuri elbow (fig 5.7.3 item 82).vii) Remove the gas valve and mixing ven
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 th
8. SHORT SPARE PARTS LISTItem GC No Part Denomination Item GC No Part Denomination32 Burner 43 Burner Gasket42 Ignitor Gasket 31 Ignitor/Sensor
Item GC No Part Denomination Item GC No Part Denomination100 Ignition PCB 99 Control PCB98 Fascia PCBWD209/1/2000 Chapter 8 : Spare Parts Listi
Fig. 1.2 - Boiler LayoutThe condensate is very slightly acidic (about the same acidity as vinegar) and should bepiped in a plastic pipe. It is not har
SHORT SPARE PARTS LIST FOR THE KESTONCONDENSING BOILER RANGEItem GC No Part Denomination47 - Flow/Return Temperature Thermistor48 - Water Pressure Swi
WD209/1/2000 Chapter 9 : Benchmark Checklist Final The Keston Celsius 25 & 25P Installation & Servicing Instructi
WD209/1/2000 Chapter 9 : Benchmark Checklist Final The Keston Celsius 25 & 25P Installation & Servicing Instructi
10. HIGH & LOW COMBUSTION SETTING PROCEDUREIt is important that the combustion at both high and low fire is checked and set when conducting any wo
7. Please note : The following procedure shall only be carried out by a trained andcompetent operative. As the adjustment of the gas valve high and lo
†Read Installation Manual Carefully†Ensure that there is at least 9 feet head of water pressure at thetop of the boiler and an open bypass acr
LPG CONVERSION INSTRUCTIONSFOR KESTON CELSIUS 25 MODELThe Keston Condensing Boiler CELSIUS 25 is supplied fabricated for Natural Gas combust
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 fac
If following the above procedure, combustion levels described above at bothhigh and low rate could not be obtained, please turn off the appliance andi
NG CONVERSION INSTRUCTIONSFOR KESTON CELSIUS 25P MODELThe Keston Condensing Boiler CELSIUS 25P is supplied fabricated for LP Gas combustio
BS 7593 : Treatment of Water in Hot Water Central HeatingSystemsFor Timber Framed Buildings, British Gas Publications DM2. Also British GasP
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 fac
If following the above procedure, combustion levels described above at bothhigh and low rate could not be obtained, please turn off the appliance andi
WD485/0/2008 1/3 CELSIUS 25 & 25P Gas valve replacement procedure for KESTON CELSIUS 25 & 25P boilers These replacement instructions mu
WD485/0/2008 2/3 The procedure below details this setting using an electronic means of locking the boiler on high or low fire rate. Where the instr
WD485/0/2008 3/3 8. After the high fire adjustment has been made/checked, isolate the electrical supply to the boiler, verify safe isolat
*) Seasonal Efficiency (SEDBUK) = 90.4% (Celsius 25) and 93.3% (Celsius 25P)This value is used in the UK Government's Standard Assessmen
2. BOILER LOCATION2.1 DIMENSIONS AND MINIMUMCLEARANCESThe boiler must be installed inminimum clearances shown toallow subsequent servicing,
Scotland, with respect to the installation of the boiler in a room or internal space containinga bath or shower.Where a room-sealed appliance is
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