Important
The Q37 and Q37P condensing boilers contain 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 before fitting the boiler.
The guarantee provided with the Keston Q37 and Q37P 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
4.1 to 4.8
Fill to a pressure of about 2.5 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. Vent the system.
Gas Supply
The complete gas installation up to the boiler gas control valve 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 and earth loop impedance using a suitable test meter.
Initial Firing
The gas pressure setting is factory adjusted to within the required range and does
not need readjustment. If the reading is incorrect then check such factors as tightness
of the air and flue pipe joints, pressure sensible joints and the gas inlet pressure
(minimum 18 mbar required for Natural Gas and 31 mbar required for LP gas). If all joints
are sound and the gas inlet pressure is satisfactory set the gas pressure check the gas
input. Full details of this procedure are given in Section 5.9 Timing The Gas Meter.
Combustion Testing
It is advisable on all installations that the combustion quality is checked by measuring the
carbon dioxide (CO
2
), or oxygen (O
2
), level. This procedure is detailed in Section 5.7
Combustion Testing. Badly tuned combustion will lead to reduce the life of the boiler and
invalidate the warranty.
WD500 Chapter 4 : Installation
The Keston Q37 & Q37P Boilers
Installation & Servicing Instructions
Page : 25
