Vaillant ecoMAX pro SERIES Instructions for use installation and servicing - page 17
Flue Preparation and Installation 11
Instructions for Installation and Servicing ecoMAX pro
17
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 cut-
ting.
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 plus the standard horizontal flue. 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 exten-
sion pipe should be inclined by 3° ± 1° fall
towards the boiler to facilitate condense remo-
val.
Fig. 11.3 Side flue extension
DRILL
AND
SCREW
Side of boiler
107
127
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.
Fig. 11.1 Rear flue
Fig. 11.2 Standard side flue
OUTER
RUBBER
COLLAR
Internal
square
trim ring
Y
70
OUTSIDE
WALL
FACE
DRILL AND
SCREW
BOILER
MOUNTING
WALL
145