Air Supply; Clearances From Wall; Distance Between Flue Outlet & Air Inlet; General Installations - Keston Celsius 25 Installation And Servicing Instructions

WD209/1/2000
A Below or beside openable window, air brick,
etc.
B Below gutters, soil pipes, drain pipes.
C Below eaves.
D Below balconies or car port roof.
E From vertical drain or soil pipes.
F From internal or external corner.
G Above ground or balcony or roof.
H From surface facing a terminal
I From terminal facing a terminal.
J From opening in a car port.
K Vertically from terminal on same wall.
L Horizontally from terminal on same wall.
Table 2.8.4
The flue outlet terminal is designed to face outwards but can, if desired, be
adapted to face in any direction BUT must not be directed in the region of the air
inlet.
The two terminals are subject to the requirements of BS 5440 Pt 1 for clearances
from features of the building although some can be decreased to the values
indicated.
The Keston Celsius 25, as with any condensing boiler, will generate a
condensate "plume" from the flue terminal in all weather conditions.
Consideration must therefore be given to the effect of this "plume" when
selecting a location for the flue terminal.
It is advisable for horizontal flue terminals to place a 45
flue to direct the condensate plume up and away from the property.
2.8.5

Clearances From Wall

Flue outlet and air inlet terminations must be at least 40 mm from the wall face.
2.8.6 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.
2.8.7

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.
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)
2.9

AIR SUPPLY

The Celsius 25 is a room sealed appliance and therefore does not require purpose
provided ventilation to the boiler room for combustion air.
Installation & Servicing Instructions
Chapter 2 - Boiler Connections
Dimensions (mm)
Minimum Flue Terminations & Air Inlet Dimensions
The Keston Celsius 25 & 25P
Flue Air
Terminal Inlet
300 50
75 75
200 50
200 50
75 50
200 50
200 100
600 100
1,200 1,200
1,200 100
1,500 1,500
300 300
o
elbow at the end of the
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