General Installations
All parts of the system must be constructed in accordance
with BS 5440 Part 1, except where specifically mentioned in
these instructions.
All pipe work must be adequately supported.
All joints other than approved push-on or plastic
compression connectors must be made and sealed with
solvent cement suitable for muPVC pipes.
Consideration must be given to Corgi/Gas Safe bulletin
TB200/TB008 regarding flues in voids.
The boiler casing must always be correctly fitted to the
boiler when leaving the appliance operational.
External wall faces and any internal faces of cavity walls
must be good.
Air Supply
The Keston Combi
2
is a room-sealed appliance and
therefore does not require purpose provided ventilation to
the boiler room for combustion air.
Compartment installation
Due to the low casing temperatures generated by the
boiler, no compartment ventilation is required. However, the
cupboard or compartment must not be used for storage.
Installations in England above 18 meters requires a High
Rise Flue Kit. This adheres to the new building regulations.
(ADB_Vol1_ Dwellings_2019_edition_inc_2020_
amendments).
Installations in Scotland above 11 meters requires the High
Rise Flue Kit. This adheres to the new building standards
technical handbook 2020: Domestic Buildings (April 2021
Addendum).
2.12 FLUE TERMINATION POSITION - CONTINUED
2.13 ASSEMBLY PRACTICE
Remove all plastic debris and burrs when installing air intake piping. Plastic fillings caused by cutting muPVC pipe must not be
allowed to be drawn into the combustion air blower. Prevent dust entering the air intake when cutting on building sites. Blower
failure which is determined to be caused by plastic filings or other debris will not be covered by guarantee.
INSTALLING FLUE AND AIR PIPES
IMPORTANT
- When installing a replacement boiler, a
new flue system is recommended.
However re-using the existing boiler flue installation is
acceptable if the installer adheres to Section 2.3 Flue
System - Important, and also checks and confirms the
following:
• Remove the flue adaptor and air spigot from the flue pack
supplied with the boiler.
•
Remove boiler front panel - Section 3.2.
•
Remove air intake blanking plate by unscrewing 4 x M5 screws
and put to one side, leaving sponge gasket in place.
•
Fix air spigot to boiler using the 4 M5 screws, see diag.
below. Ensure sponge gasket is in place and not damaged.
• Ensure the condense trap/siphon is filled with water.
• Insert the flue adaptor into the flue manifold on the top of the
boiler and secure using the clamp provided in the packaging
box, see diagram below.
• Measure, cut and check the air and flue pipes to pass to the
exit from the wall(s) or ceiling.
•
Always thoroughly deburr all pipes and most important,
remove shavings from within the pipe.
•
Assemble, using solvent weld cement, the pipework from
the boiler connections to the exit from the first wall/ceiling,
(remount the boiler if removed). When pushing pipe through
walls, ensure grit and dust is not allowed to enter the pipe.
Ensure pipes are fully engaged into sockets and solvent
welded with no leaks.
•
Using the same methods drill any further holes (always
covering existing pipework), cut and assemble the pipework.
•
From outside, complete the two terminations - See Section
2.3 Flue System and make good all holes. (Wall sealing
collars are available to make good hole areas on the wall
face (part number C.08.0.00.07.0).
•
Support any pipes whose route could be displaced either
of its own accord or by accident. Any horizontal run over
1 m or vertical runs of any length must always be supported.
Brackets should be placed at intervals of approximately
1 m. Brackets should be loose enough on the pipe to allow
thermal expansion and contraction movement.
•
Flue pipework through walls MUST be sleeved to allow
thermal expansion and contraction movement.
•
Boilers installations in England above 18 meters require
a high rise flue kit which converts the flue from MUPVC
to stainless steel using an adapter to conform with new
building regulations. For Scotland the kit will be required for
installations above 11 meters.
•
Check all connections for security and re-seal any joints
using solvent cement where soundness may be in doubt.
Note
. It is equally important to seal the air inlet with solvent
cement as the flue outlet pipe joints.
21
Installation and Servicing
FLUE OUTLET
Section 2 - Installation
