Flue Preparation And Installation - Vaillant ecoMAX pro 18 E Instructions For Use Installation And Servicing

11 Flue Preparation and installation

11.1 Flue Length
All dimensions are in mm.
To determine flue length, temporarily fit flue elbow to top
of boiler.
For rear or side flue, measure the distance from the
outside wall to the butt joint of the flue elbow fitted on top
of the boiler. A standard flue system will be suitable if the
length measured 'Y' is less than 633 mm, see
Figs. 11.1 and 11.2.
If the measurement 'Y' exceeds 633 mm then one or
more extension pipes are required.
When cutting, the flue duct should protrude 13 mm from
the end of the air duct.
11.2 Extension pipes
Refer to Figs. 11.3 and 11.4.
Note maximum permitted flue lengths.
When extension pipes are required please note the
length of the extensions, which should be taken into
account when calculating the length that requires cutting.
For example:
Distance from outside wall to butt joint on the flue elbow
'Y' = 1500 mm.
Standard flue length = 633 mm.
Extension pipe length = 970 mm.
Length of extension pipe air duct
= 1500 - 633 = 867mm.
In this example the extension pipe would be cut to
867-mm, this would be measured from the end of the air
duct where the flue duct contains the 'o-ring' seal.
When cutting, the flue duct should be cut to protrude
13-mm from the end of the air duct at the opposite end to
where the flue duct contains the 'o-ring' seal.
The maximum permitted straight flue length is
10 metres. For each 90° elbow or pair of 45° bends
fitted, the maximum length must be reduced by 1 metre.
NOTE:
When using elbows/bends any horizontal
extension pipe should be inclined by 3° ± 1°
fall towards the boiler to facilitate condense
removal.
18
Instructions for Use, Installation and Servicing ecoMAX pro
Fig 11.1
Fig 11.2
Fig 11.3