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WD52/0/1997
wire between terminals marked PL and SL and running the single 10A switched
live supply to the PL terminal. In this way the boiler pump should be wired
externally to the boiler and will not enable the pump over-run facility.
3.9
EXCHANGING A BOILER
Before removing an existing boiler add Fernox Supafloc , or equivalent cleaning agent, in
accordance with the manufacturers instructions. Open all radiator valves and fire the
boiler. When the system is fully heated, shut off the gas supply and drain down the central
heating system.
Important
The Keston condensing boiler contains components which could be damaged or blocked
by grease, dirt or solder etc. It is essential that sludge or scale is removed from an existing
system.
The guarantee provided with the Keston 130 does not cover damage caused by system
debris or sludge.
Connect the new boiler as instructed in this manual and fit in accordance with Sections
3.1 to 3.8
For sealed systems, fill to a pressure of about 2.7 bar. Check the complete system for
water soundness. If leaks need to be rectified using flux or solder the system must be
flushed cold again before proceeding.
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 4.7 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
oxygen (O
2
detailed in Section 4.9 Combustion Fine
Tuning. Badly tuned combustion will lead
to reduce the life of the boiler and
invalidate the warranty.
Installation & Servicing Instructions
Chapter 3 : Installation
), level. This procedure is
The Keston 130 Condensing Boiler
Burner pressure
Adjustment
), or
2
Burner pressure
test nipple.
GAS VALVE
Page : 20
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