4.1 GAS SUPPLY
The meter and supply pipes must be capable of delivering the required quantity of gas in addition to the demand
from any other appliances connected to the same gas supply.
Refer to Technical performance data in Section 3.1 and 3.2.
The complete installation, including the meter, must be tested for gas tightness and purged as described in BS 6891.
4.2 ELECTRICAL SUPPLY - ATTENTION
The power supply cable must be connected to a 230 V ±10% / 50 Hz mains supply respecting L - N
polarity and earth connection;
, this must be connected to a fused 3 A double pole switch with class III
overvoltage category (contact separation of at least 3 mm in both poles) or a fused 3 A 3-pin plug and unswitched
shuttered socket outlet (both complying with BS 1363) in compliance with installation regulations.
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. Replacement is recommended using a qualified company in order to prevent any risk.
The boiler must be earthed.
There must only be one common isolator, providing complete electrical isolation, for the boiler and any external controls.
Wiring external to the boiler must be in accordance with the current IEE Wiring Regulations (BS 7671).
Note: If a room thermostat is fitted, it must be suitable for 230 V switching.
If the boiler is locked out and an error code is shown on the display, the RESET button can be pressed to try and clear the fault.
If the fault still occurs after pressing the RESET button, then contact an approved engineer or Alpha service support department.
4.3 AIR SUPPLY
The boiler does not require any air vents for cooling in the room in which it is installed or when installed in a
cupboard or compartment. The minimum clearances for servicing must always be maintained.
Note: A cupboard or compartment used to enclose the boiler must be designed and constructed specifically for the purpose,
i.e. comply with the Building Regulations.
4.4 FLUE SYSTEM - Figs. 4.1, 4.2
The flue system must be installed in accordance with BS 5440:1.
With configuration C6:
• In case of windy conditions the permitted recirculation level must be lower than 10%.
• 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.
Configuration C4 is allowed with natural draught flue chimney only.
With configuration C9, the dimensions of the shaft must ensure a minimum gap between the outer wall of the flue duct and
the inner wall of the shaft: 30 mm for circular section shaft or 20 mm for square section shaft.
When using a horizontal flue kit ensure that the flue outer duct is installed horizontally (please note that the flue inner duct
already has a pre-determined slope towards the boiler for condensate to run back towards the boiler).
When additional flue extensions are used, ensure the flue slopes downwards towards the boiler by a minimum of 30 mm per
metre of flue. For extended flue runs a fall of 50 mm per metre is recommended.
Horizontal and vertical flue assemblies should be supported every metre with access provided to the joints.
All joints between flue sections should be connected using the clamps provided. It is not required to add additional screws
through the clamps and into the flue sections.
Additional flue components are available as follows:-
CD EasyFlue 500 mm telescopic terminal - Part No. 6.12000510.
CD EasyFlue 1000 mm telescopic terminal - Part No. 6.12001010.
CD 750 mm flue extension - Part No. 6.2000750.
CD 1000 mm flue extension - Part No. 6.2001050.
CD 100 mm flue support brackets (pack of 5) - Part No. 6.1000355.
CD 90° bend - Part No. 6.2000590.
CD 45° bend - Part No. 6.2000545.
CD Vertical flue terminal kit - Part No. 6.2000520. Refer to the separate installation instructions supplied with the kit.
Flue support brackets - Part No. 6.1000355.
Terminal guard - Part No. 6.2000570.
4 GENERAL BOILER INFORMATION
Alpha Evoke 28NX and 33NX - General Boiler Information
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