Potterton Promax SL Series Installation & Service Instructions Manual page 48

Backfall to the Boiler, ie. 2m flue offset (V) position 55mm
Distance in metres from boiler to the wall.
For pipe lengths greater than 4m increase the off­set by 26mm
for every additional metre to maintain approx 1.5° inclination.
Fig. 21
5. Cut the hole for the flue (minimum diameter 127mm, see table (Fig. 20) for wall thicknesses and flue diameters).
6. Drill and plug the wall as previously marked. Secure the wall plate (Fig. 22).
Fig. 22
7. Ensuring the wall plate is level both horizontally and vertically, drill and plug at least 5 securing positions at the top and bottom
through the wall plate. Utilising the slots available ensure the wall plate is square and secure to the wall (Fig. 22).
8. Additionally drill 2 relief holes 10mm deep in the wall as shown on template (Fig. 22).
9. Loosely route the condensate discharge pipe to the lower left hand side of the wall plate.
page 31
10.2 Preparing The Boiler
1. Remove the outer carton and packaging.
2. Lift the outercase upwards and remove.
3. Remove the internal packaging.