Table of Contents
Advertisement
4
GENERAL BOILER INFORMATION
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
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.
4.3
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 E-Tec 20NXS, 210 Pa for E-Tec 30NXS and 310
Pa for the E-Tec 35NXS .
•
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.
Additional flue accessories and plume management are also available.
Note: 1. If an extra 90° bend is used, this reduces the maximum flue length by 1.3 m. Each 45° bend used reduces the
maximum flue length by 0.9 m.
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.
Alpha E-Tec 20NXS, 30NXS and 35NXS - General Boiler Information
11
Advertisement
Table of Contents
