Potterton Powermax HE 115 Installation And Servicing Instructions Download

Page: 58 / 68

Publication No. 5106227

Installing Mini Terminal Flues

Mark the positions of the air/flue terminals and core drill 70
mm (2¾) diameter holes.

If the wall is clad with a

combustible material an additional 25 mm wide area must
be removed around flue liner.

With care it is possible to core drill from inside and maintain
a clean, undamaged hole on the outside wall, but where
damage to the outside wall occurs this must be made good
to ensure a satisfactory weather seal when terminals are in
position. Terminals should be inserted through the wall
liner from outside to facilitate weather sealing.

a. Measure the wall thickness and cut the liner to this

length. Cut plain end opposite flange.

b. Fit the liner through the hole making good internal and

external rendering where necessary. Apply ‘mastic’ type
sealant to the last 25 mm of the liner behind the flange
(or to the outer part of the core-drilled holes) prior to
fitting liner to help make a weather seal between the
liner and the external leaf of the wall.

c. Slide the stainless steel cone along the terminal pipe,

followed by the large flexible seal as indicated in Fig.
19. Apply high temperature (red) silicone sealant to
ensure the terminal is weather sealed to the liner.

d. Working from outside the property, push the mini

terminal through the liner until the large seal is correctly
positioned against the outside wall.

e. Centralise flue pipe in liner using spacer if required.

Slide the internal wall plate over terminal pipe and
secure to wall using the plugs and screws provided.
Tighten clip to secure terminal.

Note:

Make any final adjustment to the position of the

external seal before tightening clip.

Assembling Air/Flue Pipes

Refer to Guidance Notes on Pages 6 & 7.

The flue pipes must be assembled with the plain end of
pipe or fitting nearest the boiler and the female (socket)
end furthest from the boiler. Check that a seal is fitted in
every socket.

Always adjust length of pipes by cutting and de-burring
plain end so that it does not damage or disturb the seal.
Remove burrs from inside and outside of pipe and ensure
the pipe is clean and free from oil and grease.

Any generally “horizontal” run of flue pipe MUST NOT
FORM A LOW POINT at which condensate could
accumulate.

a. Measure and cut the first pair of flue pipes away from

the appliance. Push pipes fully into the sockets on top
of the boiler whilst also fitting the flue duct prepared as
above.

b. Measure and cut next pair of air/flue pipes.

c. Prepare pipe support brackets as required before

engaging pipes with the socket of preceding pipes or
bends.

d. Push pipes together as before taking care not to

dislodge seals. When cutting and fitting flue pipes on
extended flue systems, allow approx. 5 mm clearance
at the bottom of each joint - see Fig. 7.

e. Repeat above procedure to reach terminal. Ensure

that air inlet and flue gas connections are correctly
made and are not inadvertently reversed.

f. Fix pipe supports to masonry or woodwork so that

flue/air pipes are held securely in position.