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1.1 INTRODUCTION
The Keston Combi boiler is a wall mounted, full sequence,
automatic spark ignition, low water content, fanned flue, high
efficiency, condensing, combination gas boiler.
Note. Due to the high efficiency of the boiler a plume of water
vapour will form at the terminal during operation.
Central heating (CH) output is fully modulating with a range of:
30
6.1 to 24.2kW
35
7.1 to 24.2kW
Instantaneous domestic hot water (DHW) output is also fully
modulating with a maximum of :
30
30.3kW
35
35.3kW
The boiler is supplied fully assembled with DHW plate heat
exchanger, diverter valve, circulating pump, pressure gauge,
safety valve and CH expansion vessel.
Variable CH and DHW temperature controls are fitted on the user
control and the boiler features a DHW preheat facility.
The boiler includes as standard:
-
Automatic bypass
-
Boiler frost protection
-
Daily pump and diverter valve exercise.
-
Weather Compensation Kit
The boiler casing is of white painted mild steel with a white
polymer front panel.
The boiler temperature controls are visible located in the control
panel on the front of the boiler.
The heat exchanger is manufactured from cast aluminium.
The boiler is suitable for connection to fully pumped, sealed
heating systems ONLY. Adequate arrangements for completely
draining the system by provision of drain cocks MUST be
provided in the installation pipework.
Pipework from the boiler is routed downwards.
Data Plate
The boiler model and serial number can be located on the bottom
of the boiler casing, shown in Frame 1 - Water & Gas Connection
Diagram.
1.2 OPERATION
With no demand for CH, the boiler fires only when DHW is drawn
off, or periodically for a few seconds without any DHW draw-off, in
order to maintain the DHW calorifier in a heated condition. This
only occurs if pre-heat knob is in the 'ON' period.
When there is a demand for CH, the heating system is supplied at
the selected temperature of between 30
is drawn off. The full output from the boiler is then directed via
the diverter valve to the plate heat exchanger to supply a nominal
DHW draw-off of:
30
12.4 l/min at 35
C temperature rise.
o
35
14.5 l/min at 35
C temperature rise.
o
When using the outside sensor provided please refer to page 33.
The DHW draw off rate specified above is the nominal that the
boiler flow regulator will give. Due to system variations and
seasonal temperature fluctuations DHW flow rates/temperature
10
SECTION 1 - GENERAL
C and 80
C, until DHW
o
o
rise will vary, requiring adjustment at the draw off tap.
At low DHW draw-off rates the maximum temperature may
exceed 65ºC.
The boiler features a comprehensive diagnostic system which
gives detailed information on the boiler status when operating,
and performance of key components to aid commissioning and
fault finding.
1.3 SAFE HANDLING
This boiler may require 2 or more operatives to move it to its
installation site, remove it from its packaging base and during
movement into its installation location. Manoeuvring the boiler
may include the use of a sack truck and involve lifting, pushing
and pulling.
Caution should be exercised during these operations.
Operatives should be knowledgeable in handling techniques
when performing these tasks and the following precautions should
be considered:
•
Grip the boiler at the base.
•
Be physically capable.
•
Use personal protective equipment as appropriate, e.g.
gloves, safety footwear.
During all manoeuvres and handling actions, every attempt
should be made to ensure the following unless unavoidable and/
or the weight is light.
•
Keep back straight.
•
Avoid twisting at the waist.
•
Avoid upper body/top heavy bending.
•
Always grip with the palm of the hand.
•
Use designated hand holds.
•
Keep load as close to the body as possible.
•
Always use assistance if required.
1.4 OPTIONAL EXTRA KITS
Please visit www.keston.co.uk to access the Flue and
Accessories Guide for this boiler.
Installation and Servicing
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