Keston Combi C30 Guida utente
July 2016
UIN 215348 A01
Combi C30 & C35
When replacing any part on this appliance, use only spare parts that you can be
assured conform to the safety and performance specication that we require.
Do not use reconditioned or copy parts that have not been clearly authorised by Keston.
For the very latest copy of literature for specication and maintenance practices visit our website
www.keston.co.uk where you can download the relevant information in PDF format.
FAN POWERED HIGH EFFICIENCY
MODULATING DOMESTIC CONDENSING
GAS COMBINATION BOILER
Installation and Servicing Instructions
2
Installation and Servicing
MODEL
SYMBOL UNITS 30 35
Condensing Boiler n/a n/a yes yes
Low Temperature Boiler n/a n/a no no
B1 Boiler n/a n/a no no
Cogeneration Space Heater n/a n/a no no
Equipped with a Supplementary Heater n/a n/a no no
Combination Heater n/a n/a yes yes
Nominal Heat Output for Space Heating
Full Load P4kW 24.2 24.2
Part Load P1kW 7.9 7.9
Auxiliary Electricity Consumption
Full Load elmax kW 0.032 0.042
Part Load elmin kW 0.013 0.013
Standby PSB kW 0.005 0.005
Seasonal Space Heating Energy Efciency
Full Load ƞ4%90 90
Part Load ƞ1%98.6 98.6
Standby Loss Pstby kW 0.05 0.05
Ignition Pign kW 0 0
Emissions NOxmg/kWh 27.8 33.1
Annual Energy Consumption QHE GJ 74.1 74.1
Sound Power Level, Indoors LWA dB 46 44
Domestic Hot Water
Qelec kWh 0.075 0.074
ƞWH % 78 78.4
Qfuel kWh 7.7 7.7
AEC kWh 16.3 16
AFC GJ 5.8 5.7
ERP DATA
3
Installation and Servicing
KESTON COMBINATION BOILER
Ideal Boilers
ERP DATA
SYMBOL UNITS MODEL
30 35
Condensing boiler Yes
Seasonal Space heating efciency class A
Rated heat output kW 24
Seasonal space heating energy efciency ƞs%94
Annual energy consumption QHE GJ 74.1
Sound power level, indoors LWA dB 46 44
Water heating energy efciency class A
Seasonal Space Heating Energy Efciency of the Boiler *%
Temperature control (from che of temperature control) %
Class I Class II Class III Class IV Class V Class VI Class VII Class VIII
1% 2% 1.5% 2% 3% 4% 3.5% 5%
PRODUCT FICHE
The energy efciency of the package of products provided for in this document may not correspond to its actual energy efciency once installed in a
building, as the efciency is inuenced by further factors such as heat loss in the products in relation to the building size and its characteristics
Collector Size
(in m2)
Tank Volume
(in m3)
Collector
Efciency
(in %)
Tank rating
A* = 0.95
A = 0.91
B = 0.86
C = 0.83
D-G = 0.81
Solar Contribution (from che of solar device)
Seasonal Space Heating Energy Efciency of Package TOTAL: A+B+C=
Seasonal Space Heating Energy Efciency Class of Package
= (‘III ’x + ‘IV ’ x ) x 0.9 x ( / 100 x = %
%
GG F E D C B A A+ A++ A+++
< 30% ≥ 30% ≥ 34% ≥ 36% ≥ 75% ≥ 82% ≥ 90% ≥ 98% ≥ 125% ≥ 150%
A
B
C
4
Installation and Servicing
5
Installation and Servicing
Relevant Installation changes implemented in this book from Mod Level..............................A01 (July 2016)
DOCUMENT AMENDMENTS
Keston reserve the right to vary specication without notice
FOR ANY TECHNICAL QUERIES PLEASE RING THE KESTON
INSTALLER/TECHNICAL HELPLINE : 01482 443005
NOTE. BOILER RESTART PROCEDURE -
Press the RESTART button. The boiler will repeat the ignition sequence if a heat demand is present.
NOTES FOR THE INSTALLER
6
Installation and Servicing
7
Installation and Servicing
CONTENTS
1 GENERAL.................................................................... 8
1.1 Introduction ................................................................ 10
1.2 Operation ................................................................... 10
1.3 Safe Handling ............................................................. 10
1.4 Optional Extra Kits ..................................................... 10
1.5 Safety ......................................................................... 11
1.6 Safe Handling Of Substances .................................... 11
1.7 Location Of Boiler ...................................................... 11
1.8 Gas Supply ................................................................. 12
1.9 Water Circulation System ........................................... 12
1.10 Boiler Control Interlocks ............................................. 12
1.11 Electrical Supply ......................................................... 12
1.12 Condensate Drain .................................................... 12
1.13 Boiler Dimensions, Services & Clearances ................ 13
1.14 System Requirements - Central Heating .................... 14
1.15 System Balancing ...................................................... 15
1.16 Water Treatment......................................................... 15
2 INSTALLATION ......................................................... 16
2.1 Boiler Assembly - Exploded View ............................... 16
2.2 Unpacking .................................................................. 17
2.3 Flue System ............................................................... 18
2.4 Flue Installation Example Keston Combi C30 ............ 20
2.5 Flue Installation Example Keston Combi C35 ............ 20
2.6 Flue Termination Position ........................................... 21
2.7 Installing The Boiler .................................................... 22
2.8 Wall Mounting Template ............................................. 22
2.9 Preparing The Wall ..................................................... 22
2.10 Fitting The Wall Mounting Plate ................................. 23
2.11 Mounting The Boiler ................................................... 23
2.12 Assembly Practice ...................................................... 24
2.13 Fitting The Flue Sleeve .............................................. 25
2.14 Condensate ................................................................ 26
2.15 Connections & Filling ................................................. 28
2.16 Electrical Connections ................................................ 30
2.17 Installer Wiring ........................................................... 30
2.18 External Wiring ........................................................... 31
2.19 Replacing Pre-Fitted Mains Cable ............................. 31
2.20 Ch Operation .............................................................. 32
2.21 The Weather Compensation Kit ................................. 33
2.22 Wiring Diagram .......................................................... 34
2.23 Commissioning And Testing ....................................... 35
2.24 Initial Lighting ............................................................. 36
2.25 The Display ................................................................ 37
2.26 General Checks ......................................................... 41
2.27 Restart Procedure ...................................................... 42
2.28 Handing Over ............................................................. 42
3 SERVICING ............................................................... 43
3.1 Servicing Schedule ................................................... 43
3.2 Boiler Front Panel Removal / Replacement ............... 44
3.3 Fan And Venturi Assembly Removal And Cleaning .... 44
3.4 Burner Removal And Cleaning ................................... 45
3.5 Cleaning The Condensate Trap/Siphon ..................... 45
3.6 Cleaning The Heat Exchanger ................................... 46
3.7 Reassembly ............................................................... 46
3.8 Replacement Of Components .................................... 47
3.9 Fan Replacement ....................................................... 47
3.10 Burner Injector Replacement ..................................... 48
3.11 Burner Replacement .................................................. 48
3.12 Return Thermistor Replacement ................................ 49
3.13 Ignition Electrode Replacement ................................. 49
3.14 Flame Detection Electrode Replacement ................... 50
3.15 Spark Generator Replacement .................................. 50
3.16 Gas Control Valve Replacement ................................ 50
3.17 Diverter Valve Actuator Replacement ........................ 51
3.18 Condensate Trap/Siphon Replacement ..................... 51
3.19 PCB Replacement ...................................................... 52
3.20 Draining The Boiler .................................................... 53
3.21 DHW Flow Turbine Sensor Replacement .................. 53
3.22 Pressure Gauge Replacement ................................... 53
3.23 Safety Relief Valve Replacement ............................... 54
3.24 Pump Automatic Air Vent Replacement ..................... 54
3.25
DHW Filter & Flow Regulator Cleaning/Replacement .....
54
3.26 Diverter Valve Body Assembly Replacement ............. 55
3.27 DHW Plate Heat Exch. Replacement ......................... 55
3.28 Pump Head Replacement .......................................... 55
3.29 CH Water Pressure Switch Replacement .................. 56
3.30 Flow Thermistor Replacement ................................... 56
3.31 Heat Engine Replacement ......................................... 57
3.32 Expansion Vessel Recharging & Replacement .......... 58
4 FAULT FINDING ........................................................ 59
4.1 Fault Finding Chart Main Menu .................................. 59
4.2 Overheat Lockout ....................................................... 61
4.3 Ignition Lockout .......................................................... 61
4.4 Flame On Before Gas Valve On ................................. 62
4.5 Low Water Pressure ................................................... 62
4.6 Flame Loss ................................................................. 62
4.7 Fan Fault .................................................................... 63
4.8 Flow Thermistor Fault ................................................ 63
4.9 Return Thermistor Fault ............................................. 63
4.10 Outside Sensor Fault ................................................. 64
4.11 No CH Operation But DHW Works OK ...................... 65
4.12 No HW But CH On ..................................................... 66
4.13 No Display .................................................................. 66
5 SPARE PARTS .......................................................... 67
6 BENCHMARK & COMMISSIONING ......................... 68
8
Installation and Servicing
SECTION 1 - GENERAL
Table 1 - General Data
*Required for maximum ow rate. Boiler operates down to 2 l/min DHW delivery
** In areas of low water pressure the DHW restrictor can be removed
30 35
Gas supply 2H - G20 - 20mbar
Gas Supply Connection 15mm copper compression
Injector Size mm 4.65 4.9
Inlet Connection DHW 15mm copper compression
Outlet Connection DHW 15mm copper compression
Flow Connection CH 22mm copper compression
Return Connection CH 22mm copper compression
Flue Terminal Diameter mm (in) 50 (nominal)
Average Flue Temp-Mass Flow Rate (DHW) 68oC - 13g/s 73ºC - 15g/s
Maximum Working Pressure (Sealed Systems) bar (lb/in2)2.5 (36.3)
Maximum Domestic Hot Water Inlet Pressure
bar (lb/in
2
)(kPa)
10.0 (145) (1000)
Minimum Domestic Hot Water Inlet Pressure*
bar (lb/in
2
)(kPa)
1.3 (18.9) (130) 1.3 (18.9)** (130)
Minimum DHW Inlet Pressure to operate at 0.6
bar system pressure
bar 0.5
Electrical Supply 230 V ~ 50 Hz.
Power Consumption W 101 114
Fuse Rating External : 3A Internal : T4A HRC L250 V
Water content CH litre (gal) 1.2 (0.26)
DHW litre (gal) 0.5 (0.11)
Packaged Weight kg 34.40 34.50
Maximum Installation Weight kg 31.40 31.50
Boiler Casing Size Height mm 700
Width mm 395
Depth mm 278
Note. Gas consumption is calculated using a
caloric value of 38.7 MJ/m3 (1038 Btu/ft3) gross
or 34.9 MJ/m3 (935 Btu/ft3) nett
To obtain the gas consumption at a different
caloric value:
a. For l/s - divide the gross heat input (kW) by
the gross C.V. of the gas (MJ/m3)
b. For Btu/h - multiply the gross heat input (kW)
by 26.8
c. For ft3/h - divide the gross heat input (Btu/h)
by the gross C.V. of the gas (Btu/ft3)
d. For m3/h - multiply l/s by 3.6
Key to symbols
GB = United Kingdom IE = Ireland (Countries of destination)
PMS = Maximum operating pressure of water
C13 C33 C53
= A room sealed appliance designed for connection via ducts to a
horizontal or vertical terminal, which admits fresh air to the burner
and discharges the products of combustion to the outside through
orices which, in this case, are concentric. The fan is up stream of
the combustion chamber.
I2H = An appliance designed for use on 2nd Family gas, Group H only.
* The 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 certied by a notied body.
Table 2 - Performance Data - Central Heating Table 3 - Performance Data - Domestic Hot Water
Boiler Input : Max. Min. 30 Min. 35
Boiler Input ‘Q’ Nett CV kW 24.3 6.1 7.1
Gross CV kW 27.0 6.7 7.9
Gas Consumption m3/h 2.512 0.623 0.734
(ft3/h) (89) (22) (25.9)
Boiler Output :
Non Condensing 70oC Mean Water temp. kW 24.2 6.1 7.1
Condensing 40oC Mean Water temp. kW 25.6 6.4 7.5
Seasonal efciency* SEDBUK 2005
SEDBUK 2009
91.1%
89.6%
91.1%
89.6%
NOx Classication CLASS 5
Maximum DHW Input : 30 35
Nett CV kW 30.4 35.4
Gross CV kW 33.7 39.3
Gas Consumption m3/h 3.135 3.658
(ft3/h) (111) (129)
Maximum kW 30.3 35.3
DHW Flow Rate l/min 12.4 14.5
at 35°C temp. rise. (gpm) (2.8) (3.2)
DHW Specic Rate l/min 14.5 16.9
(gpm) (3.2) (3.7)
9
Installation and Servicing
SECTION 1 - GENERAL
Boiler Page
Make and model ......................................................... 9
Appliance serial no. on data badge .......... Front Cover
SEDBUK No. % .......................................................... 8
Controls
Time and temperature control to heating ................. 31
Time and temperature control to hot water ............. 31
Heating zone valves ................................................ n/a
TRV’s........................................................................ 12
Auto bypass ............................................................. 12
Boiler interlock .......................................................... 12
For .................................................................... all boilers
Flushing to BS.7593 ................................................. 14
Inhibitor .................................................................... 15
Central heating mode
Heat input ...................................................to be calculated
For assistance see Technical Helpline on the back page
Page
Burner operating pressure ...................................... n/a
Central heating ow temp. ...........measure and record
Central heating return temp. ........measure and record
For combination boilers only
Scale reducer ........................................................... 15
Hot water mode
Heat input ............................................to be calculated
Max. operating burner pressure .............................. n/a
Max. operating water pressure ........ measure & record
Cold water inlet temp ...................... measure & record
Hot water outlet temp. ..................... measure & record
Water ow rate at max. setting ........ measure & record
For condensing boilers only
Condensate drain ..................................................... 26
For all boilers: complete, sign & hand over to customer
For GB, to comply with Building Regulations Part L1 (Part 6 in Scotland) the boiler should be tted in accordance with the
manufacturer’s instructions. Self-certication that the boiler has been installed to comply with Building Regulations can be
demonstrated by completing and signing the Benchmark Commissioning Checklist.
Before installing this boiler, read the Code of Practice sheet at the rear of this book.
BENCHMARK COMMISSIONING CHECKLIST DETAILS
NOTE TO THE INSTALLER:
COMPLETE
THE BENCHMARK COMMISSIONING
CHECKLIST AND LEAVE THESE
INSTRUCTIONS WITH APPLIANCE
30 35
Gas supply 2H - G20 - 20mbar
Gas Supply Connection 15mm copper compression
Injector Size mm 4.65 4.9
Inlet Connection DHW 15mm copper compression
Outlet Connection DHW 15mm copper compression
Flow Connection CH 22mm copper compression
Return Connection CH 22mm copper compression
Flue Terminal Diameter mm (in) 50 (nominal)
Average Flue Temp-Mass Flow Rate (DHW) 68oC - 13g/s 73ºC - 15g/s
Maximum Working Pressure (Sealed Systems) bar (lb/in2)2.5 (36.3)
Maximum Domestic Hot Water Inlet Pressure
bar (lb/in
2
)(kPa)
10.0 (145) (1000)
Minimum Domestic Hot Water Inlet Pressure*
bar (lb/in
2
)(kPa)
1.3 (18.9) (130) 1.3 (18.9)** (130)
Minimum DHW Inlet Pressure to operate at 0.6
bar system pressure
bar 0.5
Electrical Supply 230 V ~ 50 Hz.
Power Consumption W 101 114
Fuse Rating External : 3A Internal : T4A HRC L250 V
Water content CH litre (gal) 1.2 (0.26)
DHW litre (gal) 0.5 (0.11)
Packaged Weight kg 34.40 34.50
Maximum Installation Weight kg 31.40 31.50
Boiler Casing Size Height mm 700
Width mm 395
Depth mm 278
Boiler size G.C. Appliance No. PI No.
(Benchmark No.)
30 47-930-07 86CR18
35 47-930-08 86CR18
Natural Gas only
Destination Country: GB, IE
KESTON COMBI C30 & C35
10
Installation and Servicing
SECTION 1 - GENERAL
1.1 INTRODUCTION
The Keston Combi boiler is a wall mounted, full sequence,
automatic spark ignition, low water content, fanned ue, high
efciency, condensing, combination gas boiler.
Note. Due to the high efciency of the boiler a plume of water
vapour will form at the terminal during operation.
Central heating (CH) output is fully modulating with a range of:
30 6.1 to 24.2kW
35 7.1 to 24.2kW
Instantaneous domestic hot water (DHW) output is also fully
modulating with a maximum of :
30 30.3kW
35 35.3kW
The boiler is supplied fully assembled with DHW plate heat
exchanger, diverter valve, circulating pump, pressure gauge,
safety valve and CH expansion vessel.
Variable CH and DHW temperature controls are tted on the user
control and the boiler features a DHW preheat facility.
The boiler includes as standard:
- Automatic bypass
- Boiler frost protection
- Daily pump and diverter valve exercise.
- Weather Compensation Kit
The boiler casing is of white painted mild steel with a white
polymer front panel.
The boiler temperature controls are visible located in the control
panel on the front of the boiler.
The heat exchanger is manufactured from cast aluminium.
The boiler is suitable for connection to fully pumped, sealed
heating systems ONLY. Adequate arrangements for completely
draining the system by provision of drain cocks MUST be
provided in the installation pipework.
Pipework from the boiler is routed downwards.
Data Plate
The boiler model and serial number can be located on the bottom
of the boiler casing, shown in Frame 1 - Water & Gas Connection
Diagram.
1.2 OPERATION
With no demand for CH, the boiler res only when DHW is drawn
off, or periodically for a few seconds without any DHW draw-off, in
order to maintain the DHW calorier in a heated condition. This
only occurs if pre-heat knob is in the ‘ON’ period.
When there is a demand for CH, the heating system is supplied at
the selected temperature of between 30oC and 80oC, until DHW
is drawn off. The full output from the boiler is then directed via
the diverter valve to the plate heat exchanger to supply a nominal
DHW draw-off of:
30 12.4 l/min at 35 oC temperature rise.
35 14.5 l/min at 35 oC temperature rise.
When using the outside sensor provided please refer to page 33.
The DHW draw off rate specied above is the nominal that the
boiler ow regulator will give. Due to system variations and
seasonal temperature uctuations DHW ow rates/temperature
rise will vary, requiring adjustment at the draw off tap.
At low DHW draw-off rates the maximum temperature may
exceed 65ºC.
The boiler features a comprehensive diagnostic system which
gives detailed information on the boiler status when operating,
and performance of key components to aid commissioning and
fault nding.
1.3 SAFE HANDLING
This boiler may require 2 or more operatives to move it to its
installation site, remove it from its packaging base and during
movement into its installation location. Manoeuvring the boiler
may include the use of a sack truck and involve lifting, pushing
and pulling.
Caution should be exercised during these operations.
Operatives should be knowledgeable in handling techniques
when performing these tasks and the following precautions should
be considered:
• Grip the boiler at the base.
• Be physically capable.
• Use personal protective equipment as appropriate, e.g.
gloves, safety footwear.
During all manoeuvres and handling actions, every attempt
should be made to ensure the following unless unavoidable and/
or the weight is light.
• Keep back straight.
• Avoid twisting at the waist.
• Avoid upper body/top heavy bending.
• Always grip with the palm of the hand.
• Use designated hand holds.
• Keep load as close to the body as possible.
• Always use assistance if required.
1.4 OPTIONAL EXTRA KITS
Please visit www.keston.co.uk to access the Flue and
Accessories Guide for this boiler.
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