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WD53/0/1999
Chapter 4 : Commissioning
f
Set the left hand module on/off switch to "ON". The amber light will illuminate on
the On/Off switch, the red "lockout" light will illuminate for approximately 2
seconds. The module 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 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 lamp will remain illuminated.
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, the blower will
post purge for 120 seconds and the red (lockout) lamp will illuminate.
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.
g
Turn of the on/off switch for the left hand module and repeat step (f) for the right
hand module.
h
Check for gas soundness between the gas service cocks and connection to
each burner manifold.
4.5
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.
4.6
CHECKING THE GAS PRESSURE
With each module running measure each
burner pressure at the module burner
pressure test nipple.
The gas 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
and the gas inlet pressure (20 mbar
required). If all joints are sound and the gas
inlet pressure is satisfactory remove the
brass dust cap covering the burner
pressure adjustment screw on the gas
valve (See fig. 4.6). Set the gas pressure to
the required value as stated on the
databadge by turning the exposed burner
pressure adjustment screw (clockwise will increase burner pressure, anti-clockwise will
decrease burner pressure). This will ensure that combustion is good enough to allow
combustion fine tuning to take place. Replace the brass dust cap to cover the burner
pressure adjustment screw.
Installation & Servicing Instructions
The Keston 260 & 340 Condensing Boilers
Fig 4.6
MODULE GAS
VALVE
Burner pressure
Adjustment
Burner pressure
test nipple.
Page : 18
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