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WD52/0/1997
b.
Vent the water system.
Important:
The Keston heat exchanger consists of a single coil which can trap an air pocket.
Great care must be taken to ensure that water flow has been established through
the heat exchanger and thus ensuring no air pockets remain in the heat
exchanger and pipe work. Firing the boiler while an air pocket exists in the heat
exchanger could damage it.
c.
Turn the gas service cock to ON.
d.
Turn on the electrical supply, setting any external controls to call for heat.
e.
Set the boiler On/Off switch to "ON". The amber light will illuminate on the On/Off
switch, the red "lockout" light will illuminate, the blower and pump will start and,
after about 15 seconds, a spark will light gas at the main burner, provided all air
has been purged from the gas supply to the boiler. When the burner is lit and the
boiler is operating normally the green (run) lamp, the upper lamp adjacent to the
flame symbol, will also be illuminated indicating successful ignition (If it does not
and the green lamp is extinguished after 10 seconds, air is indicated - turn off and
repeat the procedure).
If ignition does not occur, the green (run) lamp, the upper lamp adjacent to the
flame symbol, will be extinguished and, at approximately 1 minute intervals, the
electronic ignition system will make two further attempts to light the burner.
If the ignition is successful and the boiler is operating normally, the green (run)
lamp, the upper lamp adjacent to the flame symbol, and the red (lockout) lamp will
be illuminated simultaneously.
If after three automatic attempts the boiler still fails to ignite, the green (run) lamp,
the upper lamp adjacent to the flame symbol, will be extinguished and the red
(lockout) lamp will remain illuminated.
If, after five manual attempts (to allow for purging of any air in the gas line), the
boiler still fails to ignite (indicated by the red (lockout) lamp) refer to Section 5.2 -
Fault Finding Flow Chart.
f.
Check for gas soundness between the gas service cock and connection to
the burner manifold.
4.6
HOT FLUSHING
a.
Allow the system to heat up, checking for water soundness.
b.
Follow instructions provided with the cleaning agent, ie Fernox Supafloc. Turn off
the boiler and flush the water system while still hot. Thoroughly flush the system
with clear water.
c.
Refill the system using a quality water treatment such as Fernox MB1. For sealed
systems, fill to the required Initial Design Pressure.
4.7
CHECKING THE GAS PRESSURE
With the boiler running measure the burner pressure at the burner pressure test nipple.
The gas setting is factory adjusted to within the required range and should not normally
need re-adjustment unless the unit has also been converted to LPG as part of the
installation. If the reading is incorrect then check such factors as soundness of the air and
flue pipe joints and the gas inlet pressure (20 mbar required). If all joints are sound and
Installation & Servicing Instructions
Chapter 4 : Commissioning
The Keston 130 Condensing Boiler
Page : 22
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