Alpha E-Tec Plus 28NX Design, Installation And Servicing Instructions
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Alpha E-Tec Plus 28NX Design, Installation And Servicing Instructions

Wall mounted, fan assisted, room sealed, gas fired, high efficiency condensing combination boiler
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Installation and Servicing
E-Tec Plus 28NX, 33NX and 38NX
Wall Mounted, Fan Assisted, Room Sealed,
Gas Fired, High Efficiency Condensing Combination 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 2023.
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
Alpha E-Tec Plus 28NX
Alpha E-Tec Plus 33NX
Alpha E-Tec Plus 38NX
Leave these instructions with the User
G.C. No. 47 532 89
G.C. No. 47 532 90
G.C. No. 47 532 91
Part No. 1.048200 rev. ST.006992/002
0923/D468

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  • Page 1 Installation and Servicing Instructions E-Tec Plus 28NX, 33NX and 38NX Wall Mounted, Fan Assisted, Room Sealed, Gas Fired, High Efficiency Condensing Combination Boiler For Technical help or for Service call ... ALPHA HELPLINE Tel: 0344 871 8764 website: www.alpha-innovation.co.uk Nepicar House, London Road,...
  • Page 2 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 Plus 28NX, 33NX and 38NX - Benchmark Scheme...

  • Page 3: Table Of Contents

    The E-Tec Plus 28NX, 33NX and 38NX 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 Plus 28NX, 33NX and 38NX are combination boilers providing both central heating and domestic hot water at mains pressure.

  • Page 4: Safety Symbols And Information

    The user must not dispose of the appliance at the end of its service life as municipal waste, but send it to appropriate collection centres. PERSONAL PROTECTIVE EQUIPMENT SAFETY GLOVES SAFETY GOGGLES SAFETY FOOTWEAR Alpha E-Tec Plus 28NX, 33NX and 38NX - Safety Symbols and Information...
  • Page 5 The boiler is supplied with a 'Special X' type electrical connection with a PVC <HAR> H05VV-F 3 x 0.75 cable without a plug. If the power cable is damaged or replaced, it must be replaced with a cable supplied by Alpha or authorized After-Sale Technical Service.

  • Page 6: Technical Data

    Kg/h Flue mass at minimum output Kg/h Flue temperature at maximum output °C Flue temperature at minimum output °C Category II 2H3P Type of installation C13, C33, C43, C63, C93 Alpha E-Tec Plus 28NX, 33NX and 38NX - Technical Data...
  • Page 7 When the pump power supply on, the symbol is steady with green light. If the pump detects an alarm, the symbol is steady with red light. Alpha E-Tec Plus 28NX, 33NX and 38NX - Technical Data...
  • Page 8 3.5.1 E-Tec Plus 28NX Available Pump Head and Power Consumption 1000 1100 1200 1300 1400 1500 1600 1700 1800 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 9 ELECTRICAL CONNECTIONS Note: This Appliance Must Be Earthed Optional integral single channel controls are available if required. Note: Only use the Alpha single channel controls. Do not fit any two channel controls. X9 on PCB X10 on PCB X14 on PCB...
  • Page 10 Ignition/sensing electrode Heating return isolation valve 3 bar safety valve with integrated filling valve Primary return sensor Expansion vessel Heating flow isolation valve Venturi positive pressure point (+) Fig. 3.4 Alpha E-Tec Plus 28NX, 33NX and 38NX - Technical Data...

  • Page 11: 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 12 Fig. 4.1 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. 4.2 Alpha E-Tec Plus 28NX, 33NX and 38NX - General Boiler Information...
  • Page 13 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 Plus 28NX, 33NX and 38NX - General Boiler Information...
  • Page 14 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 Plus 28NX, 33NX and 38NX - General Boiler Information...
  • Page 15 Drain valves (to BS 2879) must be fitted in the heating system to allow the system to be fully drained. Filling control valves Sliding temporary connection Fig. 4.6 Alpha E-Tec Plus 28NX, 33NX and 38NX - General Boiler Information...
  • Page 16 FLUSHING THE HEATING SYSTEM It is essential that the central heating system is thoroughly cleaned and flushed before fitting an Alpha E-Tec Plus NX 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 17 25mm centres, 50mm from the bottom Soakaway depth 400mm of the tube. Holes to face filled with limestone chippings away from house. Fig. 4.8 - External soakaway Alpha E-Tec Plus 28NX, 33NX and 38NX - General Boiler Information...

  • Page 18: Installation

    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 19 B - DHW outlet elbow - (15 mm) C - Cold water mains inlet - (15 mm) D - Heating return - (22 mm) E - Heating flow - (22 mm) Fig. 5.4 Alpha E-Tec Plus 28NX, 33NX and 38NX - Installation...
  • Page 20 Check the 60mm and 100mm double lip seal gaskets are fitted with the lips facing downwards. See Fig. 5.6. Flue turret Four fixing screws Gasket protruding rib facing downwards Fig. 5.5 Flue seal ribs must face downwards Flue turret gasket must be located as shown Fig. 5.6 Alpha E-Tec Plus 28NX, 33NX and 38NX - Installation...
  • Page 21 FIT THE FLUE - PUSH FIT EASY-FLUE The following procedure applies to fitting an Alpha Easy-Flue (push fit) to both rear or side exit flue - horizontally only. The Easy-Flues are suitable for use in the flue length ranges shown in the tables below.
  • Page 22 Note: Ensure that all cuts are square and free from burrs. Once assembled with the components pushed home, the flue is fully sealed. 65 mm Do not cut past this point Fig. 5.12 Alpha E-Tec Plus 28NX, 33NX and 38NX - Installation...
  • Page 23 12 m. When the flue length required is more than the maximum stated in Section 5.7, the Alpha 750 mm flue extension (Part No. 3.031807), 1000 mm extension (Part No. 3.031808) or 2000 mm extension (Part No. 3.031814) are required to extend the range of telescopic flue.
  • Page 24 5.7b FIT THE FLUE - CLAMPED FLUE 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 25 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. 5.12b Alpha E-Tec Plus 28NX, 33NX and 38NX - Installation...
  • Page 26 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 5.7, paragraph 2 to determine the number of Alpha CD 750 or 1000 mm flue extensions required.
  • Page 27 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. 5.14 Alpha E-Tec Plus 28NX, 33NX and 38NX - Installation...
  • Page 28 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 Plus NX boilers - the maximum equivalent flue length must not exceed 12 metres. Alpha E-Tec Plus 28NX, 33NX and 38NX - Installation...
  • Page 29 5.12 FITTING BOILER CONTROLS It is recommended that Alpha controls are used with the boiler to maintain efficient and correct operation of the boiler. Please note that using controls that are not supplied or recommended by Alpha may invalidate the boiler warranty and may not control the boiler correctly.
  • Page 30 Note: Before purchasing / installing Open Therm type controls from an alternative manufacturer, it is the installers responsibility to ensure they are compatible with the Alpha boiler. Remove the control panel as described in Section 5.11, if it has not already been removed.
  • Page 31 Note: The temperature of the radiators will vary depending on the outside temperature; the required room temperature will still be maintained by the room thermostat. 8 7 6 Max. System temperature (°C) Min. External temperature (°C) Fig. 5.22 Alpha E-Tec Plus 28NX, 33NX and 38NX - Installation...

  • Page 32: Commissioning

    Loosen the gas inlet pressure test point screw on the gas valve (see Fig. 6.2) 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 Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 33 It is also displayed during the de-aeration function and with a fault in progress. The flame icon is only present when the burner is on. The bars represent the output power level. DHW display. Default display. CH display. Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 34 ) is displayed together with the relative strength of the flame (output power). For any controls fitted please refer to the instructions supplied with the controls for connection and operation details and Section 5.12. Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 35 If the electrical supply is on and the boiler has not operated for 24 hours in heating or hot water, the pump will operate automatically for thirty seconds every 24 hours. Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 36 (refer to Section 8.2). It is recommended that a label is attached to the boiler drawing attention to the fact that the system has been drained. Complete the details of the installation in the Benchmark Checklist at the back of these instructions. Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 37 Toggles between the safety software version and the functional software version d.19 Not used d.20 Not used d.21 System pressure (bar) d.22 Not used d.23 Not used d.24 Not used d.25 Not used d.26 Not used d.27 Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 38 F (+) A (-) Outlet pressure test point Gas outlet flow Inlet pressure adjustment screw test point (Max. CO ) Off/Set adjustment screw (Min. CO ) Wiring plug Fig. 6.3 Fig. 6.4 Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 39 Fig. 6.8 RESET INFO MODE If the parameter can be adjusted, it activates the option to adjust the parameter using the CH ( ) +/- buttons. Fig. 6.9 RESET INFO MODE Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 40 Not used Not used Defines the operating speed of the fan at min. DHW min. number E-Tec Plus 28NX NG = 1350 LPG = 1350 DHW output of fan revs E-Tec Plus 33NX NG = 1400 LPG = 1400 E-Tec Plus 38NX NG = 1400 LPG = 1400 Defines the operating speed of the fan at max.
  • Page 41 3 - Not used If the reading of the external probe is not correct it is possible External probe -9 - 9K to correct it in order to compensate any environmental factors reading correction Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 42 1 - Room thermostat zone1 in AND Alpha Bus input (44 - 41) 2 - Room thermostat zone 1 in OR Alpha Bus input (44 - 41) 3 - Room thermostat zone 2 in OR Alpha Bus input (44 - 41) 4 - Safety thermostat (low temperature).
  • Page 43 Where optional system flow sensor fitted (P.15 = 2), during t.15 HF temperature 0 - 15 the boiler ignition (first 60 seconds) the HF off temperature is anti-cycling offset increased of the value set. To avoid cycling Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 44 (0 - 1.2 bar) (bar/10) Value above which the fault "E146" (System pressure too high) A.11 Maximum system 15 - 35 30 (3 bar) is signaled pressure value (1.5 - 3.5 bar) (bar/10) Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 45 - (MA) Maintenance fucntion: available with boiler in OFF mode only. - (dI) Automatic vent function - (FU) Flue installation function To enter the selected function, press the 'MODE' button. To exit press the 'RESET' button or wait 15 minutes. Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 46 When the time expires, the boiler automatically goes back to Off mode, the function can also be stopped by pressing the 'RESET' button. Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 47 MA.7 Relay 2 on optional relay board 0 - 1 1 - Energised relay 0 - Off Relay 3 on optional relay board 0 - 1 MA.8 1 - Energised relay Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...
  • Page 48 6.23 ANTIFREEZE FUNCTION If the boiler sensors detect a temperature below 4°C, the boiler starts up until reaching 42°C. This function can be deactivated via parameter 'P.8' with the boiler on Off/Standy-by. Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning...

  • Page 49: Routine Servicing

    Section 7.1 and Section 7.3 paragraphs 1, 2 and 3 need to be carried out to allow a visual check of the components within the room sealed chamber. Note: For any maintenance operation not shown, contact Alpha Innovation Helpline. IMPORTANT NOTES PRIOR TO SERVICING Check the entire flue length and joints including the flue terminal outside.
  • Page 50 Take care not to damage the insulation on the back of the panel as this forms part of the casing room seal. Fig. 7.2 Fig. 7.3 Alpha E-Tec Plus 28NX, 33NX and 38NX - Routine Servicing...
  • Page 51 Fig. 7.5) 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. 7.5 Alpha E-Tec Plus 28NX, 33NX and 38NX - Routine Servicing...
  • Page 52 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 Plus 28NX, 33NX and 38NX - Routine Servicing...
  • Page 53 (Fig. 7.2). 11. Relace the bottom cover (Fig. 7.1). 12. Check the operation of the boiler. (Refer to Sections 6.6 and 6.7). 13. Return all controls to their original settings. Alpha E-Tec Plus 28NX, 33NX and 38NX - Routine Servicing...
  • Page 54 Boiler pump Gas injector 3 bar safety valve Gas valve By-pass DHW heat exchanger Diverter valve Boiler drain point Safety valve operation indicator DHW temperature sensor Flue turret Fig. 7.9 Alpha E-Tec Plus 28NX, 33NX and 38NX - Routine Servicing...

  • Page 55: 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 Plus 28NX, 33NX and 38NX - Component Replacement...
  • Page 56 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 Plus 28NX, 33NX and 38NX - Component Replacement...
  • Page 57 Unplug the wiring and unclip the sensor from the flow or return pipe as required. Re-assemble in reverse order with a new sensor onto the conductive paste ensuring good contact between the pipe and sensor. Alpha E-Tec Plus 28NX, 33NX and 38NX - Component Replacement...
  • Page 58 Lift the motor upwards and forwards to remove from the valve body. Test the boiler in heating and hot water mode to ensure the motor is correctly engaged with the diverter valve spindle. Alpha E-Tec Plus 28NX, 33NX and 38NX - Component Replacement...
  • Page 59 11. Test the boiler, check the ignition and test the combustion as described in Section 7. 8.26 ALPHA CONTROLS (if fitted) Refer to section 5.11 on the connection options for boiler controls. Alpha E-Tec Plus 28NX, 33NX and 38NX - Component Replacement...

  • Page 60: Wiring Diagram

    Component identification Bk ..Black A35 ....Control panel Bl ..Blue Alpha bus ..Climatic (optional) or Smartech Plus (optional) or OT remote control (optional). Remove link between 1 and 2 if used Br ..Brown B1 ....Flow sensor G ..Green B1 -2 .....

  • Page 61: Error Codes And Fault Finding

    Press the 'RESET' button (1) circuit or anomaly in the flame control unit (1) If the shutdown or fault persists, contact contact Alpha Heating Innovation Technical Helpline (2) The anomaly can only be verified in the list of errors in the 'Information' menu...
  • Page 62 (Optional) temperature oscillations (1) (1) If the shutdown or fault persists, contact contact Alpha Heating Innovation Technical Helpline (2) The anomaly can only be verified in the list of errors in the 'Information' menu (3) Error displayed only on Climatic...
  • Page 63 PCB hardware fault Replace PCB (1) If the shutdown or fault persists, contact contact Alpha Heating Innovation Technical Helpline (2) The anomaly can only be verified in the list of errors in the 'Information' menu (3) Error displayed only on Climatic...

  • Page 64: Short Parts List

    Boiler accessory box complete ..........3.033832 Wall template ................1.046744 Flue sensor ................1.041461 Burner front insulation panel - 28 - 33 ........3.033303 Burner front insulation panel - 38 ...........3.034924 Rear combustion insulation panel ..........3.034754 Alpha E-Tec Plus 28NX, 33NX and 38NX - Short Parts List...

  • Page 65: Energy Classification

    (*) 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. Alpha E-Tec Plus 28NX, 33NX and 38NX - Energy Classification...
  • Page 66 Yearly fuel consumption for the domestic hot water function (AFC) 18 GJ 18 GJ 23 GJ Seasonal room heating yield (ηs) 94 % 94 % 94 % Domestic hot water production yield (ηwh) 87 % 87 % 85 % Alpha E-Tec Plus 28NX, 33NX and 38NX - Energy Classification...
  • Page 67 Alpha E-Tec Plus 28NX, 33NX and 38NX - Energy Classification...
  • Page 68 Alpha E-Tec Plus 28NX, 33NX and 38NX - Energy Classification...
  • Page 69 E-Tec Plus 33NX E-Tec Plus 38NX ‘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 Plus 28NX, 33NX and 38NX - Energy Classification...
  • Page 70 * 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 Plus 28NX, 33NX and 38NX - Energy Classification...

  • Page 71: Benchmark Checklist

    GAS BOILER SYSTEM COMMISSIONING CHECKLIST & WARRANTY VALIDATION RECORD Address: Boiler make and model: Boiler serial number: Commissioned by (PRINT NAME): Gas Safe registration number: Company name: Telephone number: Company email: Company address: Commissioning date: Heating and hot water system complies with the appropriate Building Regulations? Optional: Building Regulations Notification Number (if applicable): Time, temperature control and boiler interlock provided for central heating and hot water Boiler Plus requirements (tick the appropriate box(s))

  • Page 72: Service Record

    SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the manufacturers’...
  • Page 73 SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the manufacturers’...
  • Page 74 SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the manufacturers specified spare parts.
  • Page 75 This page intentionally blank...

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E-tec plus 33nxE-tec plus 38nx47 532 8947 532 9047 532 91

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