Potterton Promax 15 HE Installation And Servicing Instructions page 20

Wall Thickness
3°
(1 in 20)
Fig. 26
Waste
Fig. 27
20
Supplied By www.heating spares.co Tel. 0161 620 6677
360° Orientation
(Z) Edge of Wall Plate to Wall
Wall Thickness
(Z) = Side Exit
(X) = Rear Exit
Flue
Inner Flue Support Bracket
Fig. 27a
8.0 Installation
8.6 Making the Gas Connection
1. Connect the gas supply to the RC
internal) gas tap located on the lower right side of
the boiler.
8.7 Fitting The Flue
Before fitting the flue, check the condensate
drain integrity (see section 8.5).
IMPORTANT: The flue should always be
installed with a 3° (1 in 20) fall from terminal to
elbow, to allow condensate to run back to the
boiler.
HORIZONTAL FLUE
1. The standard flue is suitable for lengths
270mm minimum to 800mm maximum (measured
from the edge of the flue elbow outlet).
Rear Flue: maximum wall thickness - 630mm
Side Flue: maximum wall thickness - 565mm (left or right)
2. For rear exit - measure the wall thickness
(Fig. 26) and to this dimension add 235mm. This
dimension to be known as (X).
i.e.
(X) = wall thickness + 235
3. Take the flue and mark off (X) from the
terminal end as indicated in the diagram
(Fig. 27).
Check your dimensions.
The flue tubes are fixed together. Cut through
both tubes whilst resting the flue on the semi-
circular packing pieces. Deburr both tube ends.
4. For side exit - measure the distance from the
edge of the wall plate to the inner face of the wall
(Fig. 26) and to this dimension add the wall
thickness + 275mm. This dimension to be known
as (Z).
i.e.
(Z) = wall plate to wall + wall thickness + 275
5. Take the flue and mark off (Z) from the terminal
end as indicated (Fig. 27).
Check your dimensions.
The flue tubes are fixed together. Cut through
both tubes whilst resting the flue on the semi-
circular packing pieces. Deburr both tube ends.
IMPORTANT: Check all measurements before
cutting.
NOTE: When cutting ensure the cut does not
interfere with the inner flue support bracket
(Fig. 27a).
1 / ( 1 / in BSPT
2 2