Keston C25 Installation Manual

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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 : [email protected] web : www.keston.co.uk
WD209/1/2000 The Keston Celsius 25 & 25P
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Summary of Contents

Page 1 - Fan Powered High Efficiency

Fan Powered High Efficiency Modulating Domestic Condensing Gas BoilerInstallation And Servicing InstructionsCelsius 25 & 25P ModelsCE/PI No : 87BL

Page 2 - CONTENTS

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

Page 3

f System design must ensure an open circuit is always available to ensurecirculation when the pump overrun function is operating after boil

Page 4 - 1. GENERAL INSTRUCTION

recommended, if in any doubt, to consider the use of sealed systems wherepossible.2.7.2 Sealed SystemsA sealed system kit option(C.08.

Page 5

(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

Page 6

The schematic below illustrates a recommended approach to using an additionalsystem pump. The additional system pump should be sized to over

Page 7

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&

Page 8 - 2. BOILER LOCATION

Table 2.8.4 Minimum Flue Terminations & Air Inlet DimensionsThe flue outlet terminal is designed to face outwards but can, if desired,

Page 9

2.10 COMPARTMENT INSTALLATIONDue consideration should be given to BS5440 pt 1 with regard to compartment ventilationrequirements. High and low level v

Page 10

3. INSTALLATION OF THE BOILERRead Chapter 2 - Boiler Location and decide upon the position of the boiler.Installation of the boiler is straightforward

Page 11

3.4.1 Diameter of holes.i) Allowance must be made for socketedlengths if these are to be passed throughthe holes :du = unsocketed = 56mmdiamete

Page 12 - KIT DIMENSIONS

CONTENTSSection Description1 GENERAL INSTRUCTION1.1 Description1.2 Boiler Schematic1.3 Related Documents1.4 Performance Data1.5 Optional Accessories2

Page 13

h. Check all connections for security and re-seal any joints using solventcement where soundness may be in doubt.Note: It is equally impo

Page 14 - Figure 2.8.1 : Terminals

N - Blue wire (Neutral) for 3A permanent and 2A switchedsuppliesPL - Brown wire (Live) 3A permanent supply- Yellow/Green Wire (Earth)SL - Brow

Page 15 - To Terminal

4. COMMISSIONING OF THE BOILERImportant:This condensing boiler contains components which could be damaged or blocked by grease, dirt,solder etc., fr

Page 16

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

Page 17

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

Page 18 - 3. INSTALLATION OF THE BOILER

5. FAULT FINDING5.1 ELECTRICAL CONTROL SEQUENCEWhen the external controls are calling for heat, power will be fed to the boiler connectionstrip at

Page 19

Any failure of the boiler to sequence in the above manner should be investigated using thefollowing trouble shooting flow diagram.Before attempting an

Page 20

QUICK REFERENCEENGINEERS FAULT DISPLAY TABLEFan pcb faulty. - Replace-FlashingconstantlyOFFONFan speed failure. The fan speed hasdropped below 500 rpm

Page 21

5.2 FAULT FINDING FLOW CHART - GENERAL WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions

Page 22

WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 26Is lockout lamp (red) fla

Page 23

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

Page 24

5.3 Fault Finding Flow Chart - DetailedWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions

Page 25 - 5. FAULT FINDING

WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 28IGNITION FAILUREIs there

Page 26

WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 29Is modulation LED1 lit?Is

Page 27 - ENGINEERS FAULT DISPLAY TABLE

5.4 FUNCTIONAL FLOW WIRING DIAGRAMWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Pa

Page 28 - Turn user controls

5.5 ELECTRICAL WIRING DIAGRAMWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page :

Page 29

5.6 ILLUSTRATED WIRING DIAGRAMWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page :

Page 30 - MAINS LED OFF

5.7 Exploded Assembly Diagrams5.7.1 Boiler Controls Assembly WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation &

Page 31 - IGNITION FAILURE

5.7.2 Waterway, Condensate & Flue Assembly WD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing In

Page 32 - THERMOSTAT OVERHEAT

5.7.3 Air - Gas AssemblyWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 35

Page 33

5.7.4 Casing AssemblyWD209/1/2000 Chapter 5 : Fault Finding The Keston Celsius 25 & 25PInstallation & Servicing Instructions Page : 36

Page 34 - 5.5 ELECTRICAL WIRING DIAGRAM

1. GENERAL INSTRUCTION1.1 DESCRIPTIONThe Celsius 25 is unique in its concept and design. It comprises a high efficiency stainlesssteel heat exchanger

Page 35

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

Page 36

6. ROUTINE (ANNUAL) SERVICINGTo ensure the continued safe and efficient operation of the boiler it is necessary to carry outroutine se

Page 37

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

Page 38 - 5.7.3 Air - Gas Assembly

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

Page 39 - 5.7.4 Casing Assembly

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

Page 40 - (C.08.1.04.00.0)

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

Page 41 - 6. ROUTINE (ANNUAL) SERVICING

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

Page 42

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

Page 43 - 7. REPLACEMENT OF PARTS

8. SHORT SPARE PARTS LISTItem GC No Part Denomination Item GC No Part Denomination32 Burner 43 Burner Gasket42 Ignitor Gasket 31 Ignitor/Sensor

Page 44

Item GC No Part Denomination Item GC No Part Denomination100 Ignition PCB 99 Control PCB98 Fascia PCBWD209/1/2000 Chapter 8 : Spare Parts Listi

Page 45

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

Page 46

SHORT SPARE PARTS LIST FOR THE KESTONCONDENSING BOILER RANGEItem GC No Part Denomination47 - Flow/Return Temperature Thermistor48 - Water Pressure Swi

Page 47

WD209/1/2000 Chapter 9 : Benchmark Checklist Final The Keston Celsius 25 & 25P Installation & Servicing Instructi

Page 48 - 8. SHORT SPARE PARTS LIST

WD209/1/2000 Chapter 9 : Benchmark Checklist Final The Keston Celsius 25 & 25P Installation & Servicing Instructi

Page 49 - 98 Fascia PCB

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

Page 50 - CONDENSING BOILER RANGE

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

Page 51 -

†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

Page 52 - SERVICE INTERVAL RECORD

LPG CONVERSION INSTRUCTIONSFOR KESTON CELSIUS 25 MODELThe Keston Condensing Boiler CELSIUS 25 is supplied fabricated for Natural Gas combust

Page 53

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

Page 54

If following the above procedure, combustion levels described above at bothhigh and low rate could not be obtained, please turn off the appliance andi

Page 55 - CELSIUS 25 & 25P

NG CONVERSION INSTRUCTIONSFOR KESTON CELSIUS 25P MODELThe Keston Condensing Boiler CELSIUS 25P is supplied fabricated for LP Gas combustio

Page 56 - FOR KESTON CELSIUS 25 MODEL

BS 7593 : Treatment of Water in Hot Water Central HeatingSystemsFor Timber Framed Buildings, British Gas Publications DM2. Also British GasP

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 fac

Page 58

If following the above procedure, combustion levels described above at bothhigh and low rate could not be obtained, please turn off the appliance andi

Page 59 - FOR KESTON CELSIUS 25P MODEL

WD485/0/2008 1/3 CELSIUS 25 & 25P Gas valve replacement procedure for KESTON CELSIUS 25 & 25P boilers These replacement instructions mu

Page 60 - WD297/1/2008

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

Page 61

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

Page 62

*) Seasonal Efficiency (SEDBUK) = 90.4% (Celsius 25) and 93.3% (Celsius 25P)This value is used in the UK Government's Standard Assessmen

Page 63 - WD485/0/2008

2. BOILER LOCATION2.1 DIMENSIONS AND MINIMUMCLEARANCESThe boiler must be installed inminimum clearances shown toallow subsequent servicing,

Page 64

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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