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Keston System - 

User’s

minimum Clearances

Clearances of 

165mm (6 

1/2

) above, 

100mm (4”

) below, 

2.5mm (1/8”

) at the sides and 

450mm (17 3/4

”) at the front of 

the boiler casing must be allowed for servicing.

Bottom clearance

Bottom clearance after installation can be reduced to 5mm. 
This must be obtained with an easily removable panel, to 

enable the consumer to view the system pressure gauge, and 

to provide the 100mm clearance required for servicing.

To light the boiler. refer to Frame 1

If a programmer is fitted  refer to separate instructions for the 

programmer before continuing.

1.

  CHECK THAT THE ELECTRICITY SUPPLY TO BOILER IS 

OFF.

2.

  Set the mode control knob (B) to ‘Off’.

3. 

Set the Central Heating temperature control (A) to ‘max’.

4.

  Switch ON electricity to the boiler and check that all 

external controls, e.g. programmer and room thermostat, 

are ON.

5.

  Set the mode control knob to ON.

The boiler will commence the ignition sequence supplying heat 

to the central heating, if required.

Note. 

In normal operation the boiler status display (C) will 

show  codes:

 

 

Standby - no demand for heat.      

 

Heat being supplied.

 

Boiler frost protection  - boiler will fire if temperature is 

below 5 degrees C.

During normal operation the burner on indicator (D) will remain 

illuminated when the burner is lit.

Note:  If the boiler fails to light after five attempts the fault code 

 will be displayed.

REsET pROCEDURE

To reset boiler, turn the mode control knob (B) to reset position 

and immediately turn knob back to ON.  The boiler will repeat 

the ignition sequence.  If the boiler still fails to light consult 

a Gas Safe Registered Engineer or in IE a Registered Gas 

Installer (RGII).

Introduction

The 

Keston system 

is a wall mounted, room sealed, condensing 

system boiler, featuring full sequence automatic spark ignition and fan 

assisted combustion.

Due to the high efficiency of the boiler, condensate is produced from 

the flue gases and this is drained to a suitable disposal point through 

a plastic waste pipe at the base of the boiler.  A condensate ‘plume’ 

will also be visible at the flue terminal.

Safety

Current Gas Safety (Installation & Use) 

regulations or rules in force.

In your own interest, and that of safety, it is the law that this boiler 

must be installed by a Gas Safe Registered Engineer, in accordance 

with the above regulations.
In IE, the installation must be carried out by a Registered Gas Installer 

(RGII) and installed in accordance with the current edition of I.S. 813 

“Domestic Gas Installations”, the current Building Regulations and 

reference should be made to the current ETCI rules for electrical 

installation.

It is essential that the instructions in this booklet are strictly followed, 
for safe and economical operation of the boiler.

Electricity Supply

this appliance must be earthed.

supply: 230 V ~ 50 hz. The fusing should be 3A.

Important notes

  This appliance must not be operated without the casing correctly 

fitted and forming an adequate seal.

  If the boiler is installed in a compartment then the compartment 

MUST NOT be used for storage purposes.

  If it is known or suspected that a fault exists on the boiler then 

it MUST NOT BE USED until the fault has been corrected by a 

Gas Safe Registered Engineer or in IE a Registered Gas Installer 

(RGII).

 

Under NO circumstances should any of the sealed components on 

this appliance be used incorrectly or tampered with.

  This appliance is not intended for use by persons (including 

children) with reduced physical, sensory or mental capabilities, or 

lack of experience and knowledge, unless they have been given 

supervision or instructions concerning use of the appliance by a 

person responsible for their safety.

  Children should be supervised to ensure that they do not play with 

the appliance.

In cases of repeated or continuous shutdown a Gas Safe Registered 

Engineer or in IE a Registered Gas Installer (RGII) should be called 

to investigate and rectify the condition causing this and carry out an 

operational test. Only the manufacturers original parts should be used 

for replacement.

ThE BENChMARK sERVICE INTERVAL RECORD MUsT BE COMpLETED AFTER EACh sERVICE

Keston

 is a member of the Benchmark scheme and fully supports the aims of the programme.  

Benchmark has been introduced to improve the standards of installation and commissioning of 

central heating systems in the UK and to encourage the regular servicing of all central heating 

systems to ensure safety and efficiency.

All Gas Safe Register installers carry a Gas Safe Register ID card, and have a registration number.  Both should be recorded in the

Benchmark Commissioning Checklist.  You can check your installer by calling Gas Safe Register direct on 0800 4085500.

FOR ANy qUERIEs pLEAsE RINg ThE

KEsTON CONsUMER hELpLINE : 01482 443005

NOTE. BOILER REsET pROCEDURE - 

To reset boiler, turn mode control knob to reset position and immediately turn knob back to required setting.

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