*The dimensions given in the table above may need to be increased to avoid wall
staining and nuisance depending on site conditions.
It is advisable for horizontal flue terminals to place a 45
o
elbow at the end of the
flue to direct the condensate plume up and away from the property. If the air
intake is within 500mm of the flue outlet the air must not terminal at a level above
that of the flue
If either the air inlet or flue outlet terminate at a height of less than 2.1m above
ground level, the terminal must be protected by a suitable guard. The K4 terminal
guard (with plastic coating), manufactured by Tower Flue Components Ltd is
suitable for this purpose
.
3.8.5
Clearances From Wall
Flue outlet and air inlet terminations must be at least 40 mm from the wall face.
3.8.6
Distance Between Flue Outlet & Air Inlet
There is no maximum - the terminations must not be on opposite sides of the
dwelling but can be in areas of unequal pressure..
A minimum clearance of at least 200 mm must be left between the terminations.
3.8.7
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 push-on or plastic compression connectors must be made
and sealed with solvent cement suitable for muPVC pipes and conforming to BS
6209: 1982.
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 made good.
Rubber collars are available for flue and air terminals to finish the external wall
face around the terminals (Part No C.08.0.00.07.0)
3.9
AIR SUPPLY
The KESTON C36 Combi and C36P Combi are room sealed appliances and therefore do
not require purpose provided ventilation to the boiler room for combustion air.
3.10
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.
3.11
CONDENSATE DRAINAGE
Being a condensing boiler, the C36 Combi and C36P Combi are fitted with a condensate
trap at the base of the heat exchanger and flue assembly, with facility to connect to a drain
point underneath the appliance.
Use only plastic piping
and do not reduce below 15 mm internal diameter within the
dwelling. Condensate should preferably be drained into the sanitary waste system or,
alternatively, the rainwater system of the property in most cases. Ensure in all cases that
the disposal of the condensate is in accordance with any local regulations in force.
Termination of the pipe must be either at a branch or stack internal to the house, or
externally at an open gully. Alternatively, discharge into a purpose made condensate
soakaway can be considered. Existing or purpose built drains must use suitable corrosion
resistant material as condensate is mildly acidic.
WD388/0/2004
Chapter 3 - Boiler Location The Keston C36 Combi & C36P Combi Boilers
Installation & Servicing Instructions
Page : 18
