Flue Systems And Ventilation - andrews MAXXflo EVO CWH 150/302 Installation And Maintenance Manual

4.7 FLUE SYSTEMS AND VENTILATION

4.7.1. GENERAL REQUIREMENTS
CAUTION
The installer is responsible for ensuring that the right type of fl ue system is used and that the
diameter and length are correct. For optimal installation, the accessories supplied by Andrews
Water Heaters should ensure that the correct system components are used.
The coupling and connection methods may vary depending on the manufacturer of the fl ue sys-
tem. It is not permitted to combine pipes, coupling and connection methods from diff erent manu-
facturers. This also applies to roof feed-throughs and common channels.
If connecting this heater to an older existing fl ue system, care must be taken to ensure that this
system is of the correct size and specifi cation. If the fl ue system is aluminium, a condensate trap
must be fi tted in the fl ue before it connects to the heater.
This water heater may not be used in areas where chemical substances are stored or used.
Some propellants, bleaching and cleaning agents disperse explosive vapours and / or cause ac-
celerated corrosion. Be aware that this water heater may be vulnerable to accelerated corrosion
from salty air e.g. Coastal installations
• Refer to the following standards and guidance notes before installing the fl ue system :
BS6644 : Specifi cation for the installation of gas-fi red hot water boilers of rated inputs between
70kW (net) and 1.8MW (net)
IGEM UP 10 : Installation of fl ued gas appliances in industrial and commercial premises
4.7.2 SUITABLE FLUE MATERIAL
When using a fl ue system that has not been supplied by Andrews Water Heaters, make sure that they are
certifi ed for the type and use. Check the text string printed on the fl ue system to ensure the correct materials
are selected. See the example below for guidance:
Example text
1. This material is CE approved to this standard. EN 14471 for plastic fl ue and EN 1856-1 for metal fl ue
2. Temperature rating: Class cannot be lower than T120, but can be higher
3. Pressure rating: P & H ratings are allowed, N rating is not allowed
4. Condensate resistance: Must be W (wet) rated. D (dry) rating is not allowed
5. Corrosion resistance: Must be V1 (gas combustion products) rated. V2 & V3 are not allowed
6. Material: Must be L11 minimum (Aluminium) but can be higher
7. Fire resistance class: Classed A through to E are allowed. Class F is not allowed
Installation
EN 14471 - T120 P1 W 1 O50 LI E U0
1 2 3 4
EN 1856-1 - T200 P1 W V1 L11 045 O 75
26
5 6 7
MAXXfl o EVO 150/302