Keston Qudos 28s User, Installation And Servicing Instructions
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Keston Qudos 28s User, Installation And Servicing Instructions

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Qudos 28s
User, Installation and Servicing
Instructions
FAN POWERED HIGH EFFICIENCY
MODULATING DOMESTIC CONDENSING
GAS SYSTEM BOILER
CE/PI No. 86-CM-43
Qudos 28s - GC No. 41-930-17
Qudos 28sP - GC No. 41-930-18
These instructions must be left either with the
user or next to the site gas meter.
Keston Heating
PO Box 103, National Avenue, Kingston Upon Hull, HU5 4JN
Tel. +44 (0) 1482 443005
Fax. +44 (0) 1482 467133
email : info@keston.co.uk
web :
www.keston.co.uk
COMPLIANT WITH BUILDING REGULATION PART L1 & L2
SEDBUK A RATED
W D 4 2 0
i s s u e 7 - 2 0 1 1

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  • Page 1 FAN POWERED HIGH EFFICIENCY MODULATING DOMESTIC CONDENSING GAS SYSTEM BOILER CE/PI No. 86-CM-43 Qudos 28s - GC No. 41-930-17 Qudos 28sP - GC No. 41-930-18 These instructions must be left either with the user or next to the site gas meter.
  • Page 1 FAN POWERED HIGH EFFICIENCY MODULATING DOMESTIC CONDENSING GAS SYSTEM BOILER CE/PI No. 86-CM-43 Qudos 28s - GC No. 41-930-17 Qudos 28sP - GC No. 41-930-18 These instructions must be left either with the user or next to the site gas meter.

  • Page 2: Table Of Contents

    WD420/3/2007 The Keston Qudos 28s & Qudos 28sP Boilers CONTENTS NB : These instructions are an integral part of the appliance. This document must be handed over to the user on completion of the installation to ensure compliance with the Gas Safety (Installation &...

  • Page 2: Table Of Contents

    WD420/3/2007 The Keston Qudos 28s & Qudos 28sP Boilers CONTENTS NB : These instructions are an integral part of the appliance. This document must be handed over to the user on completion of the installation to ensure compliance with the Gas Safety (Installation &...
  • Page 3 WD420/3/2007 The Keston Qudos 28s & Qudos 28sP Boilers Hot Flushing Combustion Testing Checking the Gas Pressure Timing The Gas Meter 5.10 Handing Over To The User FAULT FINDING Electrical Control Sequence Normal Operation Fault Modes Functional Flow Wiring Diagram...
  • Page 3 WD420/3/2007 The Keston Qudos 28s & Qudos 28sP Boilers Hot Flushing Combustion Testing Checking the Gas Pressure Timing The Gas Meter 5.10 Handing Over To The User FAULT FINDING Electrical Control Sequence Normal Operation Fault Modes Functional Flow Wiring Diagram...

  • Page 4: Handling Instructions

    0. HANDLING INSTRUCTIONS LIST OF CONTENTS The Keston Qudos 28s and Qudos 28sP are supplied almost totally pre-assembled. The units use standard 50 mm muPVC (BS5255 and/or BSEN1566-1 and BSEN1329) pipe for the flue and air intake systems. The boiler is packed in a single box without additional flue kit. All additional components are packed inside the boiler cabinet itself.

  • Page 4: Handling Instructions

    0. HANDLING INSTRUCTIONS LIST OF CONTENTS The Keston Qudos 28s and Qudos 28sP are supplied almost totally pre-assembled. The units use standard 50 mm muPVC (BS5255 and/or BSEN1566-1 and BSEN1329) pipe for the flue and air intake systems. The boiler is packed in a single box without additional flue kit. All additional components are packed inside the boiler cabinet itself.
  • Page 5 Safety footwear and gloves are recommended PPE when lifting this appliance - to protect against sharp edges and ensure good grip. The Qudos 28s and Qudos 28sP boilers can be fitted in compartments with very small clearances required around the appliance (refer to Section 3.1). Due consideration should therefore be given to access within the compartment for lifting and positioning.
  • Page 5 Safety footwear and gloves are recommended PPE when lifting this appliance - to protect against sharp edges and ensure good grip. The Qudos 28s and Qudos 28sP boilers can be fitted in compartments with very small clearances required around the appliance (refer to Section 3.1). Due consideration should therefore be given to access within the compartment for lifting and positioning.

  • Page 6: User Instructions

    These user instructions should be read carefully to ensure safe and economical use of your Qudos 28s or Qudos 28sP. The Qudos 28s model is for use with natural gas only, the Qudos 28sP model is for use with LPG only.

  • Page 6: User Instructions

    These user instructions should be read carefully to ensure safe and economical use of your Qudos 28s or Qudos 28sP. The Qudos 28s model is for use with natural gas only, the Qudos 28sP model is for use with LPG only.
  • Page 7 Any indication of leakage from the boiler cabinet should be investigates by a GAS SAFE REGISTER engineer. Frost Protection The Qudos 28s has an integral frost protection function. However, care should also be taken that any exposed pipework is adequately insulated to prevent freezing. Installation & Servicing Instructions...
  • Page 7 Any indication of leakage from the boiler cabinet should be investigates by a GAS SAFE REGISTER engineer. Frost Protection The Qudos 28s has an integral frost protection function. However, care should also be taken that any exposed pipework is adequately insulated to prevent freezing. Installation & Servicing Instructions...

  • Page 8: Safety Information

    WD420/3/2007 Chapter 1 : User Instructions The Keston Qudos 28s & Qudos 28sP Boilers SAFETY INFORMATION IF YOU SUSPECT A GAS LEAK TURN OFF THE APPLIANCE IMMEDIATELY, TURN OFF THE GAS TAP TO THE APPLIANCE (LOCATED UNDERNEATH) AND CONTACT YOUR GAS SUPPLIER WITHOUT DELAY.

  • Page 8: Safety Information

    WD420/3/2007 Chapter 1 : User Instructions The Keston Qudos 28s & Qudos 28sP Boilers SAFETY INFORMATION IF YOU SUSPECT A GAS LEAK TURN OFF THE APPLIANCE IMMEDIATELY, TURN OFF THE GAS TAP TO THE APPLIANCE (LOCATED UNDERNEATH) AND CONTACT YOUR GAS SUPPLIER WITHOUT DELAY.

  • Page 9: General Instruction

    DHW thermistor to enable modulated reheat of DHW and optional legionella prevention function Further, the Qudos 28s is developed with the concept that the gas boiler in the modern home is often supplemented by alternative or renewable energy sources. As a result the...

  • Page 9: General Instruction

    DHW thermistor to enable modulated reheat of DHW and optional legionella prevention function Further, the Qudos 28s is developed with the concept that the gas boiler in the modern home is often supplemented by alternative or renewable energy sources. As a result the...

  • Page 10: Boiler Schematic

    The Qudos 28s is not a high water content boiler and does not contain the metal mass, or water volume, of a cast iron or steel boiler. This boiler is of low mass and low water content and therefore responds faster when there is a call for heat.

  • Page 10: Boiler Schematic

    The Qudos 28s is not a high water content boiler and does not contain the metal mass, or water volume, of a cast iron or steel boiler. This boiler is of low mass and low water content and therefore responds faster when there is a call for heat.
  • Page 11 The flue gases are piped in a 50 mm muPVC (BS5255 and/or and BSEN1329) plastic or, alternatively, 75mm Keston composite plastic pipe to outside. The temperature of the flue gases are usually around 5 C to 10 C above the temperature of the return water.
  • Page 11 The flue gases are piped in a 50 mm muPVC (BS5255 and/or and BSEN1329) plastic or, alternatively, 75mm Keston composite plastic pipe to outside. The temperature of the flue gases are usually around 5 C to 10 C above the temperature of the return water.

  • Page 12: Related Documents

    This is to help prevent seizing of the pump due to long periods of inactivity. RELATED DOCUMENTS The Keston Qudos 28s and Qudos 28sP Condensing Boilers must be installed in accordance with the current issue of the Gas Safety (Installation and Use) Regulations 1996, current IEE Wiring Regulations, Building Regulations, Building Standards (Scotland) Consolidation, and the Bye Laws of the local Water Undertaking.

  • Page 12: Related Documents

    This is to help prevent seizing of the pump due to long periods of inactivity. RELATED DOCUMENTS The Keston Qudos 28s and Qudos 28sP Condensing Boilers must be installed in accordance with the current issue of the Gas Safety (Installation and Use) Regulations 1996, current IEE Wiring Regulations, Building Regulations, Building Standards (Scotland) Consolidation, and the Bye Laws of the local Water Undertaking.

  • Page 13: Physical Data

    Max. Total Flue Outlet and Air Intake Length OPTIONAL ACCESSORIES A range of accessories are available from KESTON Heating to compliment an installation. Terminal wall sealing collars are available to make good the external all face whilst working from the inside of the building using 50mm muPVC (BS5255 and/or BSEN1566-1 and BSEN1329) pipe.

  • Page 13: Physical Data

    Max. Total Flue Outlet and Air Intake Length OPTIONAL ACCESSORIES A range of accessories are available from KESTON Heating to compliment an installation. Terminal wall sealing collars are available to make good the external all face whilst working from the inside of the building using 50mm muPVC (BS5255 and/or BSEN1566-1 and BSEN1329) pipe.

  • Page 14: Performance Data

    KESTON Heating declare that there are no substances harmful to health within the appliance or used during the production of the appliance. The Qudos 28s is intended for domestic and commercial EMC environments and on a governed G20 meter supply.

  • Page 14: Performance Data

    KESTON Heating declare that there are no substances harmful to health within the appliance or used during the production of the appliance. The Qudos 28s is intended for domestic and commercial EMC environments and on a governed G20 meter supply.
  • Page 15 Benchmark Initiative As part of the industry wide “Benchmark” initiative Qudos 28S boiler manual includes Gas Boiler Commissioning Checklist (Chapter 10). This form should be completed by your installer at the end of the installation and commissioning process.
  • Page 15 Benchmark Initiative As part of the industry wide “Benchmark” initiative Qudos 28S boiler manual includes Gas Boiler Commissioning Checklist (Chapter 10). This form should be completed by your installer at the end of the installation and commissioning process.

  • Page 16: Boiler Location

    The Qudos 28S and Qudos 28SP are classified as IP20 (IPX0) and are therefore suitable for installation in Zone 3 areas, unless subject to hose down.

  • Page 16: Boiler Location

    The Qudos 28S and Qudos 28SP are classified as IP20 (IPX0) and are therefore suitable for installation in Zone 3 areas, unless subject to hose down.
  • Page 17 The wall on which the boiler is mounted must be of suitable load bearing capacity and must be non-combustible. The Keston Qudos 28s 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 17 The wall on which the boiler is mounted must be of suitable load bearing capacity and must be non-combustible. The Keston Qudos 28s 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 18 However, the Qudos 28s features a wide range of OPTIONAL control features normally associated with commercial boilers installations at additional cost. These are provided as standard in the Qudos 28s and require low costs sensors to be added to activate them. The features provided are detailed below. Refer to Chapter 4.8 for further wiring detail.
  • Page 18 However, the Qudos 28s features a wide range of OPTIONAL control features normally associated with commercial boilers installations at additional cost. These are provided as standard in the Qudos 28s and require low costs sensors to be added to activate them. The features provided are detailed below. Refer to Chapter 4.8 for further wiring detail.

  • Page 19: Boiler Size Selection

    The Keston Qudos 28s & Qudos 28sP Boilers BOILER SIZE SELECTION The Qudos 28s 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 Qudos 28s is therefore suitable for all systems with a total heat load within the maximum range of the boiler.

  • Page 19: Boiler Size Selection

    The Keston Qudos 28s & Qudos 28sP Boilers BOILER SIZE SELECTION The Qudos 28s 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 Qudos 28s is therefore suitable for all systems with a total heat load within the maximum range of the boiler.
  • Page 20 WD420/3/2007 Chapter 3 : Boiler Location The Keston Qudos 28s & Qudos 28sP Boilers Copper tubing to BS 2871 Part 1 or barrier plastic pipe suitable to 110 C, such as Unipipe, is recommended. Jointing should be either with capillary, threaded or compression fittings. Pipes should have a gradient to ensure air is passed easily to vent points and water flows readily to drain points.
  • Page 20 WD420/3/2007 Chapter 3 : Boiler Location The Keston Qudos 28s & Qudos 28sP Boilers Copper tubing to BS 2871 Part 1 or barrier plastic pipe suitable to 110 C, such as Unipipe, is recommended. Jointing should be either with capillary, threaded or compression fittings. Pipes should have a gradient to ensure air is passed easily to vent points and water flows readily to drain points.
  • Page 21 WD420/3/2007 Chapter 3 : Boiler Location The Keston Qudos 28s & Qudos 28sP Boilers The installation must be designed to work with flow temperatures of up to 110 All components of the system must be suitable for a working pressure of 3 bar and a temperature of 110 C.
  • Page 21 WD420/3/2007 Chapter 3 : Boiler Location The Keston Qudos 28s & Qudos 28sP Boilers The installation must be designed to work with flow temperatures of up to 110 All components of the system must be suitable for a working pressure of 3 bar and a temperature of 110 C.

  • Page 22: Flue System

    Contact KESTON Heating for information The Qudos 28s also has advance control options built in which enable modulated reheat of DHW and anti-legionella function. Refer to Chapter 4 for more detail.

  • Page 22: Flue System

    Contact KESTON Heating for information The Qudos 28s also has advance control options built in which enable modulated reheat of DHW and anti-legionella function. Refer to Chapter 4 for more detail.
  • Page 23 Chapter 3 : Boiler Location The Keston Qudos 28s & Qudos 28sP Boilers Alternatively, where flue or air intake lengths of up to 60m are require, Keston Composite 75mm flue and air pipe can be used (contact your KESTON Heating stockist for details).
  • Page 23 Chapter 3 : Boiler Location The Keston Qudos 28s & Qudos 28sP Boilers Alternatively, where flue or air intake lengths of up to 60m are require, Keston Composite 75mm flue and air pipe can be used (contact your KESTON Heating stockist for details).
  • Page 24 The two terminals are subject to the requirements of BS 5440 Pt 1 for clearances from features of the building although some can be decreased to the values indicated. The Keston Qudos 28s and Qudos 28sP, as with any condensing boiler, will generate a condensate “plume” from the flue terminal in all weather conditions.
  • Page 24 The two terminals are subject to the requirements of BS 5440 Pt 1 for clearances from features of the building although some can be decreased to the values indicated. The Keston Qudos 28s and Qudos 28sP, as with any condensing boiler, will generate a condensate “plume” from the flue terminal in all weather conditions.

  • Page 25: Compartment Installation

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  • Page 25: Compartment Installation

    3.11 CONDENSATE DRAINAGE Being a condensing boiler, the Qudos 28S and Qudos 28SP are 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 26: Installation Of The Boiler

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  • Page 26: Installation Of The Boiler

    WD420/3/2007 Chapter 4 : Installation The Keston Qudos 28s & Qudos 28sP Boilers 4. INSTALLATION OF THE BOILER Read Chapter 3 - 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 27: Condensate Drainage

    9& %JCRVGT   +PUVCNNCVKQP 6JG -GUVQP 3WFQU U 3WFQU U2 $QKNGTU 2WV VJG HNWG URKIQV CUUGODNGF YKVJ VJG VGUV RNWI QP VJG ECDKPGV HTCOG CPF UGEWTG KV D[ HCUVGPKPI VJG VYQ / UETGYU %QWRNG VJG URKIQV VQ VJG KPVGTPCN HNWG RKRG WUKPI VJG HNGZKDNG EQWRNG CPF HCUVGPKPI ENKRU 'PUWTG VJG ENKRU CTG RTQRGTN[ UGEWTGF CPF PQ NGCMCIG ECP QEEWT 4GOGODGT VJG HNWG RKRG OWUV UNQRG FQYPYCTFU DCEM VQYCTFU VJG DQKNGT CPF VJKU...

  • Page 27: Condensate Drainage

    WD420/3/2007 Chapter 4 : Installation The Keston Qudos 28s & Qudos 28sP Boilers Put the flue spigot assembled with the test plug on the cabinet frame and secure it by fastening the two M6 screws. Couple the spigot to the internal flue pipe using the flexible couple and fastening clips.

  • Page 28: Water System

    Advanced Features Wiring The Qudos 28s features comprehensive and advance functionality as standard. Whilst these advances functions are not mandatory, they will provide enhanced boiler operation performance and efficiency. Detailed below are suggested wiring methods to activate various functions.

  • Page 28: Water System

    Advanced Features Wiring The Qudos 28s features comprehensive and advance functionality as standard. Whilst these advances functions are not mandatory, they will provide enhanced boiler operation performance and efficiency. Detailed below are suggested wiring methods to activate various functions.
  • Page 29 WD420/3/2007 Chapter 4 : Installation The Keston Qudos 28s & Qudos 28sP Boilers Twin Thermostat Operation with Weather Compensation SEPARATE CH & DHW DEMAND WITH ( OPTIONAL ) WEATHER COMPENSATION ORANGE GREY Q28S BLUE BROWN FROM CH BOILER CONTROLS CH ZONE...
  • Page 29 WD420/3/2007 Chapter 4 : Installation The Keston Qudos 28s & Qudos 28sP Boilers Twin Thermostat Operation with Weather Compensation SEPARATE CH & DHW DEMAND WITH ( OPTIONAL ) WEATHER COMPENSATION ORANGE GREY Q28S BLUE BROWN FROM CH BOILER CONTROLS CH ZONE...

  • Page 30: Exchanging A Boiler

    It is essential that sludge or scale is removed from an existing system before fitting the boiler. The guarantee provided with the Keston Qudos 28s and Qudos 28sP does not cover damage caused by system debris or sludge.

  • Page 30: Exchanging A Boiler

    It is essential that sludge or scale is removed from an existing system before fitting the boiler. The guarantee provided with the Keston Qudos 28s and Qudos 28sP does not cover damage caused by system debris or sludge.
  • Page 31 WD420/3/2007 Chapter 4 : Installation The Keston Qudos 28s & Qudos 28sP Boilers Initial Firing The gas pressure setting is factory adjusted to within the required range and does not need readjustment. If the reading is incorrect then check such factors as tightness of the air and flue pipe joints, pressure sensible joints and the gas inlet pressure (minimum 18 mbar required for Natural Gas and 31 mbar required for LP gas).
  • Page 31 WD420/3/2007 Chapter 4 : Installation The Keston Qudos 28s & Qudos 28sP Boilers Initial Firing The gas pressure setting is factory adjusted to within the required range and does not need readjustment. If the reading is incorrect then check such factors as tightness of the air and flue pipe joints, pressure sensible joints and the gas inlet pressure (minimum 18 mbar required for Natural Gas and 31 mbar required for LP gas).

  • Page 32: Commissioning Of The Boiler

    INITIAL FLUSHING All waterways within the Keston Qudos 28s and Qudos 28sP are either copper or high alloy stainless steel. As a result water treatment chemicals for central heating boilers such as Fernox MB1, Sentinel X100 or equivalent, are suitable.

  • Page 32: Commissioning Of The Boiler

    INITIAL FLUSHING All waterways within the Keston Qudos 28s and Qudos 28sP are either copper or high alloy stainless steel. As a result water treatment chemicals for central heating boilers such as Fernox MB1, Sentinel X100 or equivalent, are suitable.
  • Page 33 Carbon dioxide and carbon monoxide are colourless, odourless gases produced by all combustion processes. When the Keston condensing boiler is operating properly, carbon dioxide (CO ) levels will be between 8.4 & 8.8% (low rate) and 8.9 & 9.3% (high rate) and carbon oxide (CO) levels will be between 5 to 20 ppm (low rate) and 50 to 150 ppm (high rate) for natural gas.
  • Page 33 Carbon dioxide and carbon monoxide are colourless, odourless gases produced by all combustion processes. When the Keston condensing boiler is operating properly, carbon dioxide (CO ) levels will be between 8.4 & 8.8% (low rate) and 8.9 & 9.3% (high rate) and carbon oxide (CO) levels will be between 5 to 20 ppm (low rate) and 50 to 150 ppm (high rate) for natural gas.
  • Page 34 50 ppm at low rate. If CO levels above these values are experienced, the combustion chamber and flue system should be investigated. The Qudos 28s is factory set for combustion and should need no adjustment. However, in the event adjustment is required.
  • Page 34 50 ppm at low rate. If CO levels above these values are experienced, the combustion chamber and flue system should be investigated. The Qudos 28s is factory set for combustion and should need no adjustment. However, in the event adjustment is required.
  • Page 35 WD420/3/2007 Chapter 5 : Commissioning The Keston Qudos 28s & Qudos 28sP Boilers Press the “RESET” button twice to return to the normal operation mode and display. CHECKING THE GAS PRESSURE With the boiler running measure the burner pressure at the burner pressure test nipple.
  • Page 35 WD420/3/2007 Chapter 5 : Commissioning The Keston Qudos 28s & Qudos 28sP Boilers Press the “RESET” button twice to return to the normal operation mode and display. CHECKING THE GAS PRESSURE With the boiler running measure the burner pressure at the burner pressure test nipple.

  • Page 36: Fault Finding

    WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6. FAULT FINDING ELECTRICAL CONTROL SEQUENCE When the external control(s) are calling for heat, power will be fed to the boiler connection strip at terminal SL1 (Switched Live) and N (Neutral) and the radiator symbol with a “1” will appear in the top left of the display.

  • Page 36: Fault Finding

    WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6. FAULT FINDING ELECTRICAL CONTROL SEQUENCE When the external control(s) are calling for heat, power will be fed to the boiler connection strip at terminal SL1 (Switched Live) and N (Neutral) and the radiator symbol with a “1” will appear in the top left of the display.
  • Page 37 SL1 or SL2. Other methods of placing a demand on the boiler is via an Opentherm control, such as the Keston Room Controller, or a 0-10VDC input. Either alternative input is indicated by the inverted “T” symbol on the bottom row of the display.
  • Page 37 SL1 or SL2. Other methods of placing a demand on the boiler is via an Opentherm control, such as the Keston Room Controller, or a 0-10VDC input. Either alternative input is indicated by the inverted “T” symbol on the bottom row of the display.

  • Page 38: Fault Modes

    WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers FAULT MODES If a situation is detected which the boiler considers may cause damage to the appliance the boiler will enter a lockout mode and stop functioning. After clearing the problem the user must also press the “Reset”...

  • Page 38: Fault Modes

    WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers FAULT MODES If a situation is detected which the boiler considers may cause damage to the appliance the boiler will enter a lockout mode and stop functioning. After clearing the problem the user must also press the “Reset”...
  • Page 39 The Keston Qudos 28s & Qudos 28sP Boilers ERROR HISTORY The Qudos 28s has an internal memory function that stores the last six errors encountered along with the sensor readings at that time and the time elapsed between each error occurring. This is very useful for diagnosing the cause of an error lockout, particularly when the error is intermittent.
  • Page 39 The Keston Qudos 28s & Qudos 28sP Boilers ERROR HISTORY The Qudos 28s has an internal memory function that stores the last six errors encountered along with the sensor readings at that time and the time elapsed between each error occurring. This is very useful for diagnosing the cause of an error lockout, particularly when the error is intermittent.
  • Page 40 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers FUNCTIONAL FLOW WIRING DIAGRAM Installation & Servicing Instructions Page : 35...
  • Page 40 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers FUNCTIONAL FLOW WIRING DIAGRAM Installation & Servicing Instructions Page : 35...
  • Page 41 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers ELECTRICAL WIRING DIAGRAM Installation & Servicing Instructions Page : 36...
  • Page 41 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers ELECTRICAL WIRING DIAGRAM Installation & Servicing Instructions Page : 36...
  • Page 42 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers ILLUSTRATED WIRING DIAGRAM Installation & Servicing Instructions Page : 37...
  • Page 42 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers ILLUSTRATED WIRING DIAGRAM Installation & Servicing Instructions Page : 37...
  • Page 43 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers Exploded Assembly Diagrams 6.7.1 Boiler Controls Assembly Installation & Servicing Instructions Page : 38...
  • Page 43 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers Exploded Assembly Diagrams 6.7.1 Boiler Controls Assembly Installation & Servicing Instructions Page : 38...
  • Page 44 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6.7.2 Waterway, Condensate & Flue Assembly Installation & Servicing Instructions Page : 39...
  • Page 44 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6.7.2 Waterway, Condensate & Flue Assembly Installation & Servicing Instructions Page : 39...
  • Page 45 9& %JCRVGT   (CWNV (KPFKPI 6JG -GUVQP 3WFQU U 3WFQU U2 $QKNGTU +PUVCNNCVKQP 5GTXKEKPI +PUVTWEVKQPU 2CIG  ...
  • Page 45 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers Installation & Servicing Instructions Page : 40...
  • Page 46 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6.7.3 Air Gas Assembly Installation & Servicing Instructions Page : 41...
  • Page 46 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6.7.3 Air Gas Assembly Installation & Servicing Instructions Page : 41...
  • Page 47 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6.7.4 Casing Assembly Installation & Servicing Instructions Page : 42...
  • Page 47 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6.7.4 Casing Assembly Installation & Servicing Instructions Page : 42...
  • Page 48 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6.7.5 Exploded Diagrams Parts Reference List Boiler Controls Assembly (Fig. 6.7.1) GC Number Code Description Q28s Main Control PCB (Q.10S.4.01.00.0 F) Q28sP Main Control PCB (Q.10S.4.15.00.0 F) Control Panel (Q.10S.4.02.00.0)
  • Page 48 WD420/3/2007 Chapter 6 : Fault Finding The Keston Qudos 28s & Qudos 28sP Boilers 6.7.5 Exploded Diagrams Parts Reference List Boiler Controls Assembly (Fig. 6.7.1) GC Number Code Description Q28s Main Control PCB (Q.10S.4.01.00.0 F) Q28sP Main Control PCB (Q.10S.4.15.00.0 F) Control Panel (Q.10S.4.02.00.0)
  • Page 49 When servicing ensure that the gas and electrical supplies to the boiler are isolated before any work starts. Hazardous materials are not used in the construction of the Qudos 28s and Qudos 28sP. However, due care should be taken when handling boiler components.
  • Page 49 When servicing ensure that the gas and electrical supplies to the boiler are isolated before any work starts. Hazardous materials are not used in the construction of the Qudos 28s and Qudos 28sP. However, due care should be taken when handling boiler components.
  • Page 50 WD420/3/2007 Chapter 7 : Servicing The Keston Qudos 28s & Qudos 28sP Boilers If necessary clean the burner with a mild household detergent and rinse under a hot running tap. If necessary, from visual inspection, clean the heat exchanger using a suitable...
  • Page 50 WD420/3/2007 Chapter 7 : Servicing The Keston Qudos 28s & Qudos 28sP Boilers If necessary clean the burner with a mild household detergent and rinse under a hot running tap. If necessary, from visual inspection, clean the heat exchanger using a suitable...

  • Page 51: Replacement Of Parts

    WD420/3/2007 Chapter 8 : Replacement Of Parts The Keston Qudos 28s & Qudos 28sP Boilers 8. REPLACEMENT OF PARTS CONTENTS GENERAL PRECAUTIONS ACCESS REPLACEMENT PROCEDURE ELECTRICAL COMPONENTS 8.4.1 CONTROL PANEL 8.4.2 BOILER FLOW & RETURN THERMISTORS 8.4.3 CABINET TEMPERATURE SENSOR 8.4.4...

  • Page 51: Replacement Of Parts

    WD420/3/2007 Chapter 8 : Replacement Of Parts The Keston Qudos 28s & Qudos 28sP Boilers 8. REPLACEMENT OF PARTS CONTENTS GENERAL PRECAUTIONS ACCESS REPLACEMENT PROCEDURE ELECTRICAL COMPONENTS 8.4.1 CONTROL PANEL 8.4.2 BOILER FLOW & RETURN THERMISTORS 8.4.3 CABINET TEMPERATURE SENSOR 8.4.4...
  • Page 52 WD420/3/2007 Chapter 8 : Replacement Of Parts The Keston Qudos 28s & Qudos 28sP Boilers Remove the Control Panel by removing the four retaining screws (Fig 6.7.1, item 160). Reassemble (Section 8.3) vii) Check for correct operation of the Control Panel.
  • Page 52 WD420/3/2007 Chapter 8 : Replacement Of Parts The Keston Qudos 28s & Qudos 28sP Boilers Remove the Control Panel by removing the four retaining screws (Fig 6.7.1, item 160). Reassemble (Section 8.3) vii) Check for correct operation of the Control Panel.
  • Page 53 WD420/3/2007 Chapter 8 : Replacement Of Parts The Keston Qudos 28s & Qudos 28sP Boilers 8.4.7 Combustion Blower (Fig. 6.7.3 item 111) Isolate the appliance (Section 8.1) Gain access (Section 8.2) iii) Disconnect the connector block from the combustion blower.
  • Page 53 WD420/3/2007 Chapter 8 : Replacement Of Parts The Keston Qudos 28s & Qudos 28sP Boilers 8.4.7 Combustion Blower (Fig. 6.7.3 item 111) Isolate the appliance (Section 8.1) Gain access (Section 8.2) iii) Disconnect the connector block from the combustion blower.
  • Page 54 9& %JCRVGT   4GRNCEGOGPV 1H 2CTVU 6JG -GUVQP 3WFQU U 3WFQU U2 $QKNGTU 4GOQXG VJG  PWVU HKZKPI VJG DWTPGT VQ VJG VQR QH VJG JGCV GZEJCPIGT (KI  KVGO   4GOQXG VJG URCTM KIPKVKQPHNCOG FGVGEVKQP GNGEVTQFG 5GEVKQP  9KVJFTCY VJG DWTPGT HTQO VJG VQR QH VJG JGCV GZEJCPIGT XKK 4GCUUGODNG 5GEVKQP ...
  • Page 54 WD420/3/2007 Chapter 8 : Replacement Of Parts The Keston Qudos 28s & Qudos 28sP Boilers Remove the 4 nuts fixing the burner to the top of the heat exchanger (Fig 6.7.3, item 120). Remove the spark ignition/flame detection electrode (Section 8.5) Withdraw the burner from the top of the heat exchanger.
  • Page 55 9& %JCRVGT   4GRNCEGOGPV 1H 2CTVU 6JG -GUVQP 3WFQU U 3WFQU U2 $QKNGTU &TCKP VJG U[UVGO VQ DGNQY VJG NGXGN QH VJG CRRNKCPEG &KUEQPPGEV VJG HNGZKDNG JQUG (KI    KVGO  HTQO VJG GZRCPUKQP XGUUGN 7PFQ VJG RKP (KI   KVGO  CPF VJG '8 DTCEMGV (KI   KVGO  HTQO VJG ECDKPGV HTCOG XKK 4GOQXG VJG GZRCPUKQP XGUUGN...
  • Page 55 WD420/3/2007 Chapter 8 : Replacement Of Parts The Keston Qudos 28s & Qudos 28sP Boilers Drain the system to below the level of the appliance. Disconnect the flexible hose (Fig. 6.7.2 - 2/2 item 95) from the expansion vessel. Undo the pin (Fig. 6.7.4 - item 37) and the EV bracket (Fig. 6.7.4 - item 39) from the cabinet frame.
  • Page 56 WD420/3/2007 Chapter 9 : Spare Parts Listings The Keston Qudos 28s & Qudos 28sP Boilers 9. SHORT SPARE PARTS LIST Item GC No Part Denomination Item GC No Part Denomination Burner Kit Burner Gasket Ignitor Gasket Ignitor Kit Flow/Return Thermistors...
  • Page 56 WD420/3/2007 Chapter 9 : Spare Parts Listings The Keston Qudos 28s & Qudos 28sP Boilers 9. SHORT SPARE PARTS LIST Item GC No Part Denomination Item GC No Part Denomination Burner Kit Burner Gasket Ignitor Gasket Ignitor Kit Flow/Return Thermistors...
  • Page 57 WD420/3/2007 Chapter 9 : Spare Parts Listings The Keston Qudos 28s & Qudos 28sP Boilers Q28s Gas Valve - Mixer Assem. Q28sP Gas Valve - Mixer Assem. Control Panel Q28s Control PCB Q28sP Con. PCB Pump Expansion Vessel Installation & Servicing Instructions...
  • Page 57 WD420/3/2007 Chapter 9 : Spare Parts Listings The Keston Qudos 28s & Qudos 28sP Boilers Q28s Gas Valve - Mixer Assem. Q28sP Gas Valve - Mixer Assem. Control Panel Q28s Control PCB Q28sP Con. PCB Pump Expansion Vessel Installation & Servicing Instructions...
  • Page 58 WD420/3/2007 Chapter 9 : Spare Parts Listings The Keston Qudos 28s & Qudos 28sP Boilers SHORT SPARE PARTS LIST FOR THE KESTON CONDENSING BOILER RANGE Item GC No Part Denomination Burner Kit Burner Gasket Ignitor Kit Ignitor Gasket Flow/Return Thermistor...
  • Page 58 WD420/3/2007 Chapter 9 : Spare Parts Listings The Keston Qudos 28s & Qudos 28sP Boilers SHORT SPARE PARTS LIST FOR THE KESTON CONDENSING BOILER RANGE Item GC No Part Denomination Burner Kit Burner Gasket Ignitor Kit Ignitor Gasket Flow/Return Thermistor...
  • Page 59 WD420/3/2007 Chapter 10 : Benchmark Checklist Final The Keston Qudos 28s & Qudos 28sP Boilers 10. 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 7,0( 7(03(5$785( &21752/ 72...
  • Page 59 WD420/3/2007 Chapter 10 : Benchmark Checklist Final The Keston Qudos 28s & Qudos 28sP Boilers 10. 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 7,0( 7(03(5$785( &21752/ 72...

  • Page 60: Service Interval Record

    WD420/3/2007 Chapter 10 : Benchmark Checklist Final The Keston Qudos 28s & Qudos 28sP Boilers 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 60: Service Interval Record

    WD420/3/2007 Chapter 10 : Benchmark Checklist Final The Keston Qudos 28s & Qudos 28sP Boilers 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 61 WD420/3/2007 The Keston Qudos 28s & Qudos 28sP Boilers KESTON CONDENSING BOILERS IMPORTANT Qudos 28s and Qudos 28sP INSTALLATION KEY POINTS Read Installation Manual Carefully Ensure that ALL dust particles, filings , plastic chips etc. are removed from the inlet pipe.
  • Page 61 WD420/3/2007 The Keston Qudos 28s & Qudos 28sP Boilers KESTON CONDENSING BOILERS IMPORTANT Qudos 28s and Qudos 28sP INSTALLATION KEY POINTS Read Installation Manual Carefully Ensure that ALL dust particles, filings , plastic chips etc. are removed from the inlet pipe.

This manual is also suitable for:

Qudos 28sp41-930-1741-930-18

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