Alpha E-Tec 20S Installation And Servicing Instructions
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Alpha E-Tec 20S Installation And Servicing Instructions

Wall mounted, fan assisted, room sealed, gas fired, high efficiency condensing system boiler
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Installation and Servicing
E-Tec 20S and 30S
Wall Mounted, Fan Assisted, Room Sealed,
Gas Fired, High Efficiency Condensing System Boiler
These instructions have been carefully prepared but we reserve the right
to alter the specification at any time in the interest of product improvement.
© Alpha Therm Limited 2018.
Instructions
For Technical help or for Service call ...
ALPHA HELPLINE Tel: 0344 871 8764
website: www.alpha-innovation.co.uk
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
Set for use with Natural Gas
Leave these instructions with the User
Part No. 1.041383 rev. ST.003581/001
0518/D382

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  • Page 1: Installation And Servicing

    E-Tec 20S and 30S Wall Mounted, Fan Assisted, Room Sealed, Gas Fired, High Efficiency Condensing System Boiler For Technical help or for Service call ... ALPHA HELPLINE Tel: 0344 871 8764 website: www.alpha-innovation.co.uk Nepicar House, London Road, Wrotham Heath, Sevenoaks,...
  • Page 2 Benchmark Service Interval Record and left with the householder. www.centralheating.co.uk Useful contact details: Gas Safe Register - 0800 408 5577 - www.gassaferegister.co.uk Alpha Heating Innovation: General Sales Enquiries - 0344 871 8760 Technical Helpline - 0344 871 8764 Alpha E-Tec S 20 and 30 - Benchmark Scheme...

  • Page 3: Table Of Contents

    Component replacement ....40 INTRODUCTION The E-Tec 20S and 30S are wall mounted, room sealed, fan assisted, high efficiency, condensing boilers. The burner is lit electronically and the heat output is controlled by a modulating fan and gas valve. The E-Tec 20S and 30S are boilers that provided central heating only, on a sealed system.
  • Page 4 11.2 (+0.2/-0.4) at minimum output 10.6 (+0.3/-0.1) 10.0 (+0.4/-0.2) Gas rate at maximum output kg/h 2.24 2.53 * with Alpha Diverter Kit fitted Note: OtherTechnical data is the same as NG data. Alpha E-Tec S 20 and 30 - Technical Data...

  • Page 5: Technical Data

    Recommended hole size for instalation from inside the building Boiler dry lift weight E-Tec 20S 32.2 34.1 E-Tec 30S Boiler operating weight (full of water) approx. E-Tec 20S 33.9 E-Tec 30S 36.0 Max. total flue length Horizontal Max. total flue length...
  • Page 6 2.4.1 E-Tec 20S Available Pump Head and Power Consumption 1000 1200 1400 1600 Flow rate (l/h) A+B = Head available with by-pass closed B = Head available with by-pass open C+D = Power consumed by the pump with by-pass open (dotted area) D = Power consumed by the pump with by-pass closed (dotted area) Fig.

  • Page 7: Electrical Connections

    Optional integral single channel controls are available if required. Note: Only use the Alpha two channel controls. Do not fit any single channel controls*. Fig. 2.3 shows the Internal two channel clock option for S or Y plan. Alternatively bring a Switched Live from external controls to terminal 1.
  • Page 8 Safety valve indicator Expansion vessel Burner Heating return isolation valve Venturi positive pressure point (+) Primary return sensor Heating flow isolation valve Venturi Automatic air vent Primary flow temperature sensor Fig. 2.4 Alpha E-Tec S 20 and 30 - Technical Data...

  • Page 9: General Boiler Information

    2. Under no circumstances must the flue length (including allowances for extra bends) exceed 12 metres horizontally and only 14 metres vertically. 3. Failure to use Alpha flue components with the boiler will invalidate the boilers CE approval, guarantee and may be unsafe.

  • Page 10: General Boiler Information

    Fig. 3.1 VERTICAL FLUE OPTIONS Not less than 300 mm Not less than 300 mm Hmax = 14 m Hmax = 12.2 m (14 m - 1.8 m) Fig. 3.2 Alpha E-Tec S 20 and 30 - General Boiler Information...
  • Page 11 Where a terminal is sited below 2 m from the ground or floor level, the terminal must be protected by a terminal guard. In these situations, consideration should also be given to prevent nuisance plume and fumes in areas such as access routes, passageways, patios, balconies etc. Alpha E-Tec S 20 and 30 - General Boiler Information...

  • Page 12: Boiler Location

    The boiler may be installed in a cupboard or compartment, provided it is correctly designed for that purpose, i.e. complies with the Building Regulations and the requirements of BS 6798. Alpha E-Tec S 20 and 30 - General Boiler Information...
  • Page 13 Hose unions Double check valve assembly Heating circuit Mains return water Stop Stop supply valve valve Test cock Filling loop temporarily connected Fig. 3.6 Alpha E-Tec S 20 and 30 - General Boiler Information...
  • Page 14 FLUSHING THE HEATING SYSTEM It is essential that the central heating system is thoroughly cleaned and flushed when fitting an Alpha boiler. Failure to do so will invalidate the warranty. The primary condensing heat exchanger is constructed in stainless steel and therefore is compatible with most materials used in a heating system.
  • Page 15 Two rows of 3 x 12mm holes at 25mm centres, 50mm from the bottom Soakaway depth 400mm of the tube. Holes to face filled with limestone chippings away from house. Fig. 3.8 - External soakaway Alpha E-Tec S 20 and 30 - General Boiler Information...
  • Page 16 Condensate discharge pipe Literature pack and Wall template A suitable Alpha flue system must be selected to use with the boiler. Notes: a. All flues must be suitable for Alpha condensing boilers. b. CD 750 mm and 1000 mm flue extensions are available, if required.

  • Page 17: Installation

    Gas service cock (yellow) Electrical connection Heating drain point A - Gas inlet - (22 mm) B - Heating return - (22 mm) C - Heating flow - (22 mm) Fig. 4.4 Alpha E-Tec S 20 and 30 - Installation...
  • Page 18 FIT THE FLUE - Figs. 4.5 and 4.6 The following procedure applies to fitting an Alpha CD Easy-Flue to both rear or side exit flue - horizontally only. The CD Easy-Flues are suitable for use in the flue length ranges shown in the tables below.
  • Page 19 Note: Ensure that all cuts are square and free from burrs. Once assembled with the components pushed home, the flue is fully sealed. Allow 20 mm 30 mm Do not cut past this point Fig. 4.10 Alpha E-Tec S 20 and 30 - Installation...
  • Page 20 Use the template (supplied with the boiler) to mark the required flue position, ensure the slope towards the boiler is correct. Determine the overall flue length as described in Section 4.6, paragraph 2 to determine the number of Alpha CD 750 or 1000 mm flue extensions required.
  • Page 21 Plume Management 1000 mm extension 60 mm dia. (equivalent to 1 m flue length) - Part No. 6.2001310. 60 mm dia. wall bracket - Part No. 6.2001260. Plume kit (2 x 93° bends 1 x 1000 mm extension and wall bracket) - Part No. 6.2001300. Fig. 4.12 Alpha E-Tec S 20 and 30 - Installation...
  • Page 22 Note: The equivalent horizontal flue assembly length + the equivalent plume management length (PM length) must not exceed the maximum flue length stated for each boiler, i.e. E-Tec boilers - the maximum equivalent flue length must not exceed 12 metres. Alpha E-Tec S 20 and 30 - Installation...
  • Page 23 With enhanced boiler control, the unit further increases boiler and system efficiency. Alternatively standard programmable room thermostats or mechanical and digital boiler clocks are available. Note: Only use a Climatic or suitable single channel Alpha controller. Do not fit a two channel controller. Connecting Controls Remove the control panel cover as described in Section 4.10, if it has not already been removed.
  • Page 24 '1'. External Sensor – Weather compensation feature The weather compensation sensor can only be used on an E-Tec S boiler when the Alpha Diverter Kit (part No. X.XXXXXX) is used, otherwise the DHW temperature will be affected The E-Tec S boilers have a built in weather compensation feature which is automatically activated when the external sensor is fitted –...
  • Page 25 4.12 OPTIONAL ALPHA SYSTEM DIVERTER KIT The Alpha Diverter Kit operates as a hot water priority valve. If the heating is on and there is a hot water demand the valve will divert the primary hot water to the cylinder until the cylinder sensor is satisfied. The heating will be held off during this period so it is recommended that a high recovery cylinder is used.

  • Page 26: Commissioning

    Loosen the gas inlet pressure test point screw on the gas valve (see Fig. 5.2) and purge in accordance with BS 6891. Retighten the test point screw and test for gas tightness. Close the boiler gas service cock. Alpha E-Tec S 20 and 30 - Commissioning...
  • Page 27 ) buttons and is shown on the display. Note: The Summer mode will only function if the Alpha Diverter Kit has been fitted. When using a standard 'Y' or 'S' plan system the boiler MUST BE left in Winter mode.
  • Page 28 BOILER OPERATION With the optional Alpha Diverter Kit fitted, the E-Tec S operates with hot water priority. If the heating is on and there is a hot water demand the valve will divert the primary hot water to the cylinder until the cylinder sensor is satisfied. The heating will be held off during this period so it is recommended that a high recovery cylinder is used.
  • Page 29 Note: It is a requirement that the installation is registered by the installer through the Gas Safe Gas Work Notification Scheme. 12. Leave these Installation and Servicing instructions with the User for use on future calls. Alpha E-Tec S 20 and 30 - Commissioning...
  • Page 30 Using an indelible marker pen, delete the data relative to the old type of gas. These adjustments must be made according to the type of gas used, given in the table (Section 2). Alpha E-Tec S 20 and 30 - Commissioning...
  • Page 31 A (-) F (+) Outlet pressure test point Gas outlet flow Inlet pressure adjustment screw test point (Max. CO ) Off/Set adjustment screw (Min. CO ) Wiring plug Fig. 5.2 Fig. 5.3 Alpha E-Tec S 20 and 30 - Commissioning...
  • Page 32 P0 - P5 ← RESET ← RESET ← RESET RESET + INFO (Without Parameter t0 - t9 → → memorising) value > 5 secs A0 - A6 S0 - S2 > 1 sec (Memorise) Alpha E-Tec S 20 and 30 - Commissioning...
  • Page 33 Section of the remote control communication protocol 0 - 1 0 - Alpha Climatic communication 1 - OpenTherm type remote control - Boiler terminal block link 1 protocol setting to 2 must be present Alpha E-Tec S 20 and 30 - Commissioning...
  • Page 34 Value below the cylinder set point to activate cylinder heating (the 0 - 15 activation cylinder heating OFF is fixed at the cylinder DHW set point value) temperature (Alpha Diverter kit required) Not used on this model Alpha E-Tec S 20 and 30 - Commissioning...

  • Page 35: Routine Servicing

    Note: 1. Check the expansion vessel charge only when the system pressure is zero. 2. The expansion vessel pressure test point is accessible from on top at the top left side. Alpha E-Tec S 20 and 30 - Routine Servicing...
  • Page 36 Take care not to damage the insulation on the back of the panel as this forms part of the casing room seal. Fig. 6.2 Alpha E-Tec S 20 and 30 - Routine Servicing...
  • Page 37 (view 'A' in Fig. 6.4) Lower the panel out and away from the top cover. Note: The side panels require no sealing strip as the front case insulation forms the room seal. View A Fig. 6.4 Alpha E-Tec S 20 and 30 - Routine Servicing...
  • Page 38 Check the condition of the burner injector in the gas valve outlet, carefully clean with a soft brush if necessary - Do not use a brush with metallic bristles as this might damage the injector. Unscrew and replace the injector should it appear damaged. Alpha E-Tec S 20 and 30 - Routine Servicing...
  • Page 39 Primary return temperature sensor Condensate trap Primary pressure switch Gas injector Automatic air vent Gas valve Boiler pump Boiler drain point 3 bar safety valve Safety valve operation indicator By-pass Fig. 6.6 Alpha E-Tec S 20 and 30 - Routine Servicing...
  • Page 40 To ensure correct and safe operation of the appliance, it is essential that any worn or failed components are replaced with only genuine Alpha spare parts. Use of non-genuine Alpha spares could invalidate your warranty and may pose a potential safety hazard.

  • Page 41: Component Replacement

    Unplug the wire from the flue sensor. Using a 13 mm spanner, turn the sensor 90° anti-clockwise and withdraw it from the heat exchanger. Fit the new sensor and re-assemble in reverse order. Alpha E-Tec S 20 and 30 - Component Replacement...

  • Page 42: Wiring Diagram

    Lift out the trap being careful not to spill any condense water, remove the trap from the boiler. It is important to clean the trap every time the trap is removed to flush out any deposits from the collection bowl. Note: Partially fill the trap before replacing. Alpha E-Tec S 20 and 30 - Component Replacement...
  • Page 43 Remove the main cable grommet in the bottom panel and remove the sensor tube. Fit the new gauge sensor using a new 'O' ring on the connection if necessary. Reassemble in reverse order. Refill and pressurise the system. (Refer to Commissioning, Section 5.1). Alpha E-Tec S 20 and 30 - Component Replacement...
  • Page 44 Test the boiler, check the ignition and test the combustion as described in Section 6 7.20 ALPHA CONTROLS (if fitted) Refer to section 4.11 on the connection options for boiler controls. Alpha E-Tec S 20 and 30 - Component Replacement...

  • Page 45: Illustrated Wiring Diagram

    (optional) Alpha Diverter Valve to be used with Alpha Climatic Control Configurable relay Parameter P3=5 When an Alpha Climatic control is connected to terminals 41 and 44 CH ON contact closed CH OFF contact open +Vcc 6=Neutral 5=Live (CH ON)

  • Page 46: Error Codes And Fault Finding

    Where an error code is displayed use the following tables to identify the fault and possible causes. ERROR CODES AND FAULT FINDING If any fault or anomaly persists, contact Alpha Heating Innovation Technical Helpline. The history of errors can be viewed in the 'INFO' menu - d9...

  • Page 47: Error Codes And Fault Finding

    Possible failure of one or both sensors Check sensor wiring and connections fault Check sensor resistance Return/flow sensor Possible failure of one or both sensors Check sensor wiring and connections fault Check sensor resistance Alpha E-Tec S 20 and 30 - Error Codes and Fault Finding...
  • Page 48 (i.e. 12 for one year). Save by pressing the mode button ( ) and wait for '88' to be displayed as confirmation Alpha E-Tec S 20 and 30 - Error Codes and Fault Finding...

  • Page 49: Short Parts List

    1.020393 Boiler wall bracket 2.015350 Boiler connection kit 3.024893 Boiler accessory box complete 3.026880 Wall template 1.039776 Burner front insulation panel 1.039141 Flue sensor 1.024296 Rear combustion insulation panel 1.040351 Alpha E-Tec S 20 and 30 - Short Parts List...
  • Page 50 Contact details Alpha Therm Ltd., Nepicar House, Wrotham Heath, Kent. TN15 7RS (*) High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater outlet. (**) Low temperature means for condensing boilers 30°C, for low-temperature boilers 37°C and for other heaters 50°C return temperature.

  • Page 51: Energy Classification

    (AFC) hot water function (AFC) Seasonal room heating yield (ηs) 93 % Seasonal room heating yield (ηs) 93 % Domestic hot water production yield (ηwh) Domestic hot water production yield (ηwh) Alpha E-Tec S 20 and 30 - Energy Classification...
  • Page 52 Alpha E-Tec S 20 and 30 - Energy Classification...
  • Page 53 * To be established by means of table 5 of Regulation 811/2013 in case of “assembly” including a heat pump to integrate the boiler. In this case the boiler must be considered as the main appliance of the assembly. Alpha E-Tec S 20 and 30 - Energy Classification...
  • Page 54 11.7 PARAMETERS FOR FILLING IN DHW PACKAGE ASSEMBLY CHART Parameter E-Tec 20S E-Tec 30S ‘I’ ‘II’ ‘III’ * To be determined according to Regulation 811/2014 and transient calculation methods as per Notice of the European Community no. 207/2013. Alpha E-Tec S 20 and 30 - Energy Classification...
  • Page 55 Alpha E-Tec S 20 and 30 - Energy Classification...

  • Page 56: Benchmark Checklist

    GAS BOILER SYSTEM COMMISSIONING CHECKLIST This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference. Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty.

  • Page 57: Service Record

    SERVICE RECORD It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s instructions. Always use the manufacturer’s specifed spare part when replacing controls.
  • Page 58 Alpha E-Tec S 20 and 30 - Page intentionally Blank...
  • Page 59 Alpha E-Tec S 20 and 30 - Page intentionally Blank...

This manual is also suitable for:

E-tec 30s

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