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WD53/0/1999
Chapter 3 : Installation
The Keston 260 & 340 Condensing Boilers
Reduce the pressure to the Initial System Design Pressure for sealed systems, if
applicable. Vent the system.
Gas Supply
The complete gas installation up to the boiler service cock must be checked for
soundness. BS 6891.
Electrical Installation
Carry out preliminary electrical safety checks, i.e. Earth continuity, Polarity, Resistance to
Earth, Short Circuit using a suitable test meter.
Initial Firing
The gas pressure setting is factory adjusted to within the required range and
should not normally need re-adjustment. If the reading is incorrect then check such
factors as soundness of the air and flue pipe joints, pressure sensible joints and the gas
inlet pressure (20 mbar required). If all joints are sound and the gas inlet pressure is
satisfactory set the gas pressure. Full details of this procedure are given in Section 4.6
Checking The Gas Pressure. This will ensure that combustion is good enough to allow
combustion fine tuning to take place.
Combustion Fine Tuning
It is advisable on all installations that the combustion quality is checked by measuring the
carbon dioxide (CO
), or oxygen (O
), level. This procedure is detailed in Section 4.7
2
2
Combustion Fine Tuning. Badly tuned combustion will lead to reduce the life of the boiler
and invalidate the warranty.
Installation & Servicing Instructions
Page : 16
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