Alpha Evoke 28NX Instructions Manual

Wall mounted, fan assisted, room sealed, gas fired, high efficiency condensing combination boiler

Hide thumbs

Table Of Contents

Installation and Servicing

Evoke 28NX and 33NX

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.

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 Evoke 28NX

Alpha Evoke 33NX

Alpha Evoke 28NX LPG

Alpha Evoke 33NX LPG

Leave these instructions with the User

G.C. No. 47 532 84

G.C. No. 47 532 86

G.C. No. 47 532 85

G.C. No. 47 532 87

Part No. 1.046746 rev. ST.006691.000

0223/D448

Table of Contents

Need help?

Do you have a question about the Evoke 28NX and is the answer not in the manual?

Questions and answers

Avril Burrowes

June 25, 2025

How do I get the pressure up on my system I have error code 10

Summary of Contents for Alpha Evoke 28NX

Page 1 Evoke 28NX and 33NX 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, Wrotham Heath, Sevenoaks,...
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 Evoke 28NX and 33NX - Benchmark Scheme...
Page 3: Table Of Contents
Service Record ........59 INTRODUCTION The Evoke 28NX and 33NX 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 Evoke 28NX and 33NX are combination boilers providing both central heating and domestic hot water at mains pressure.
Page 4: Safety Symbols
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 Evoke 28NX and 33NX - Safety Symbols...
Page 5: Technical Data
Flue mass at maximum output Kg/h Flue mass at minimum output Kg/h Flue temperature at maximum output °C Flue temperature at minimum output °C Note: OtherTechnical data is the same as NG data. Alpha Evoke 28NX and 33NX - Technical Data...
Page 6 (by-pass closed). Adjust using a flat head screwdriver, turn anticlockwise to close the by-pass, and clockwise to open. With the by-pass in the closed position the system must have a continuous open circuit. If zone valves are used in the system an external by-pass must be fitted. Alpha Evoke 28NX and 33NX - 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. 3.5.1 Evoke 28NX Available Pump Head and Power Consumption 1000 1100 1200 1300 1400 1500 1600 1700 1800 Flow rate (l/h)
Page 8 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. Programmer clock (optional) J2 on PCB J1 on PCB...
Page 9 Automatic air vent Air vent drain valve (do not block) Pressure signal vent fitting Boiler pump Gas isolation valve Venturi Primary pressure switch Primary heat exchanger Primary flow temperature sensor Fig. 3.4 Alpha Evoke 28NX and 33NX - Technical Data...
Page 10: General Boiler Information
Installation on opposite walls of the building is not allowed. • The maximum permitted pressure loss of the flue system is 160 Pa for Evoke 28NX and 210 Pa for Evoke 33NX . • The flue system must be suitable to work up 120°C.
Page 11 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 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 Evoke 28NX and 33NX - General Boiler Information...
Page 13 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 Evoke 28NX and 33NX - General Boiler Information...
Page 14 Drain taps (to BS 2879) must be used to allow the system to be completely drained. Hose unions Double check valve assembly Heating circuit Mains return water Stop Stop supply valve valve Test cock Filling loop temporarily connected Fig. 4.6 Alpha Evoke 28NX and 33NX - General Boiler Information...
Page 15 4.10 DISPOSAL OF CONDENSATE Provision must be made for the safe disposal of condensate produced by the flue gases of the Alpha boilers and reference should be made to BS 6798 for the requirements on the disposal of condensate.
Page 16 Before the mains water supply pipe is connected to the boiler, it should be thoroughly flushed out to avoid the danger of dirt or foreign matter entering the boiler. Alpha Evoke 28NX and 33NX - General Boiler Information...
Page 17: 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 18 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 Evoke 28NX and 33NX - Installation...
Page 19 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 Evoke 28NX and 33NX - Installation...
Page 20 FIT THE FLUE - Figs. 5.7 and 5.8 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 21 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. 5.12 Alpha Evoke 28NX and 33NX - Installation...
Page 22 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 23 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 Evoke 28NX and 33NX - Installation...
Page 24 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. Evoke NX boilers - the maximum equivalent flue length must not exceed 12 metres. Alpha Evoke 28NX and 33NX - Installation...
Page 25 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 26 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 27: 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 Evoke 28NX and 33NX - Commissioning...
Page 28 The lighting mode can be varied via parameter 't8' in the PCB programming menu. For any controls fitted please refer to the instructions supplied with the controls for connection and operation details and Section 5.11. Alpha Evoke 28NX and 33NX - Commissioning...
Page 29 Pump Cycle 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 Evoke 28NX and 33NX - Commissioning...
Page 30 Tell the User about the sealed system pressure. Tell the User that if the electrical supply is on and the boiler has not operated for 24 hours for heating or hot water, the pump will automatically operate for 30 seconds. Alpha Evoke 28NX and 33NX - Commissioning...
Page 31 Reset to return to the Info number. Info Menu Information Units (d - prefix) Shown FlowSmart cylinder temperature adjustment (optional) with Alpha Diverter kit only °C Flame signal µA Central heating water temperature leaving the boiler °C Domestic hot water temperature leaving the boiler °C...
Page 32 Flue test point 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. 6.2 Fig. 6.3 Alpha Evoke 28NX and 33NX - Commissioning...
Page 33 P0 - P8 ← RESET ← RESET ← RESET RESET + INFO Parameter (Without t0 - t9 → → value memorising) > 5 secs A0 - A6 S0 - S2 > 1 sec (Memorise) Alpha Evoke 28NX and 33NX - Commissioning...
Page 34 1 - OpenTherm type remote control - Boiler terminal block link 1 to 2 must be present 2 - Not used on this model Common flue Not used on this model Alpha Evoke 28NX and 33NX - Commissioning...
Page 35 0 Fixed - The switch-off temperature is fixed at the maximum value regardless of the value set on the control panel 1 Corrolated - The boiler switches off according to the temperature Alpha Evoke 28NX and 33NX - Commissioning...
Page 36: 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. Alpha Evoke 28NX and 33NX - Routine Servicing...
Page 37 Pull the combustion panel 'E' slightly towards you. Release the combustion panel 'E' from the pins 'F' pulling it towards you while pushing it upwards at the same time. Fig. 7.1 Fig. 7.2 Alpha Evoke 28NX and 33NX - Routine Servicing...
Page 38 10. 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. 7.4 Alpha Evoke 28NX and 33NX - Routine Servicing...
Page 39 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 Evoke 28NX and 33NX - Routine Servicing...
Page 40 (Fig. 7.1). 11. Check the operation of the boiler. (Refer to Sections 6.5 and 6.6). 12. Return all controls to their original settings. Alpha Evoke 28NX and 33NX - Routine Servicing...
Page 41 Automatic air vent Gas injector Boiler pump Gas valve 3 bar safety valve DHW heat exchanger By-pass Boiler drain point Diverter valve DHW temperature sensor Safety valve operation indicator Primary heat exchanger Fig. 7.8 Alpha Evoke 28NX and 33NX - Routine Servicing...
Page 42: Component Replacement
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 43 Gain access as described in Section 8.1. Unplug the wiring and unclip the sensor from the DHW outlet pipe as required. Re-assemble in reverse order with a new sensor ensuring a good contact between the pipe and sensor. Alpha Evoke 28NX and 33NX - Component Replacement...
Page 44 Note: Lubricating the seals with soap and water will aid assembly. 11. Refill boiler, pressurise the system and visually inspect for leaks. 12. Test the boiler, check the ignition and test the combustion as described in Section 7. Alpha Evoke 28NX and 33NX - Component Replacement...
Page 45 Remove and replace the seals in the back of the hydro block housing. Replace in reverse order making sure that the printed writing on the heat exchanger is at the top. Refill and pressurise the system. (Refer to Commissioning, Section 6.1). Alpha Evoke 28NX and 33NX - Component Replacement...
Page 46 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 5.12 on the connection options for boiler controls. Alpha Evoke 28NX and 33NX - Component Replacement...
Page 47: Wiring Diagram
41 38 39 Chassis earth For testing only Alpha When an Alpha Climatic control is connected to terminals 40 and 41 Climatic Control remove the link between terminals 1 and 2 (optional) Colour Code Component identification B1 ....Flow sensor Bk ..Black...
Page 48: Error Codes And Fault Finding
Where an error code is displayed use the following tables to identify the fault and possible causes. 10.2 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 49 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 Evoke 28NX and 33NX - Error Codes and Fault Finding...
Page 50 Check individual components in turn Pump with UPM4 Pump fault Possible causes for this anomaly: electronics ONLY 1. Low power supply voltage 2. Seized rotor Symbol with 3. Electrical fault steady red light Alpha Evoke 28NX and 33NX - Error Codes and Fault Finding...
Page 51: Short Parts List
Clip - Flow/return pipe to heat exchanger 1.038458 Clip - Gas pipe connections 1.043652 Boiler wall bracket 2.015350 Boiler connection kit 3.027624 Boiler accessory box complete 3.033623 Wall template 1.046744 Flue sensor 1.024296 Alpha Evoke 28NX and 33NX - Short Parts List...
Page 52: Energy Classification
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 53 (AFC) Seasonal room heating yield (ηs) 94 % Seasonal room heating yield (ηs) 94 % Domestic hot water production yield (ηwh) 87 % Domestic hot water production yield (ηwh) 87 % Alpha Evoke 28NX and 33NX - Energy Classification...
Page 54 Alpha Evoke 28NX and 33NX - Energy Classification...
Page 55 * 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 Evoke 28NX and 33NX - Energy Classification...
Page 56 12.7 PARAMETERS FOR FILLING IN DHW PACKAGE ASSEMBLY CHART Parameter Evoke 28NX Evoke 33NX ‘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 Evoke 28NX and 33NX - Energy Classification...
Page 57 Alpha Evoke 28NX and 33NX - Energy Classification...
Page 58: 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 59: 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.

This manual is also suitable for:

Evoke 33nx

Alpha Evoke 28NX Instructions Manual

Table of Contents

Need help?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Alpha Evoke 28NX

Summary of Contents for Alpha Evoke 28NX

This manual is also suitable for:

Table of Contents