Keston K130 Wiring Diagram download pdf (Page 6)

Slope

'Horizontal' flue outlet pipework MUST slope at least 2.5

degrees (45 mm per metre run) downwards towards the

boiler. Pipework can be vertical. Only swept elbows can be

used. For installations requiring reduced slope contact

Keston Boilers Technical Support.

Air inlet pipework can be truly horizontal or vertical, or

sloping in a downward direction towards the boiler but in

this case rain, etc, must be prevented from entering the

pipe. There must be no troughs in any of the pipework,

whether it be air inlet or flue outlet.

Due to the low temperature of the flue

gases further condensate will form within

the flue system. Drain points, with

suitable traps, must therefore be

incorporated within the flue

system at the base of vertical flue sections

in excess of 4m (2m for the Keston 130

and Keston 170). These additional

condensate drains must be run to discharge as detailed in

section "Condensate Drainage". Such drain points can be

formed using standard Keston Composite flue fittings.

Terminations

Air inlet terminals must be positioned to ensure only fresh

air is drawn into the boiler. The air terminal must be located

outside of the building.

Drawing of combustion air directly from a ventilated boiler

room will invalidate the heat exchanger warranty.

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. Where the air

and flue terminals are located in close proximity the flue

terminal should be located above the level of the air inlet

terminal.

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.

If either the air inlet or the flue outlet terminate at a height

of less than 2m (6ft) above ground level the termination

must be protected by a suitable guard. Suitable terminal

guards can be obtained from Tower Flue Components Ltd

or its distributors.

The Keston Condensing Boiler, 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°

elbow at the end of the flue to direct the condensate plume

up and away from the property.

Flue outlet and air inlet terminations must be at least 60 mm

and 95 mm respectively from the wall face.

There is no maximum distance between flue terminal and

air inlet terminal - the terminations can be on opposite sides

of the dwelling if desired.

A minimum clearance of at least 500 mm must be left

between the terminations.

Compartment Installation

The casing temperatures of the Keston commercial boilers

are very low. Due to this fact, no compartment ventilation is

required for cooling purposes.

Condensate Drainage

Being a condensing boiler, the Keston is 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 22mm

internal diameter within the dwelling. Condensate should

preferably be drained into the sanitary waste system or,

alternatively, the rainwater system of the property.

Termination of the pipe must be either at a branch or stack

internal to the building, 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.

A minimum slope downwards towards the drain of 1 in 20

is essential. Freezing of the termination and pipework must

be prevented. Any drainage pipes outside the property must

be at least 32 mm inside diameter.

To Terminal

To Boiler

Te e

Fitting

6 in

min

Minimum Flue Terminations and Flue Air

Air Inlet Dimensions (mm) Terminal Inlet

A Below or beside openable window, air brick etc. 500 50

B Below gutters, soil pipes, drain pipes 75 75

C Below eaves 300 50

D Below balconies or car port roof 200 50

E From vertical drain or soil pipes 75 50

F From internal or external corner 600 50

G Above ground or balcony or roof 300 100

H From surface facing a terminal 600 100

I From terminal facing a terminal 1200 1200

J From opening in a car port 1200 100

K Vertically from terminal on same wall 1500 1500

L Horizontally from terminal on same wall 300 300

1 2 3 4 5 6 7 8

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Keston K130 Wiring Diagram Page 6

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