Commissioning
50
10 Commissioning
A damaged pellet delivery hose can
allow a back draught through the boiler
resulting in the pellet tube (burn back)
thermostat operating and shutting
down the burner.
• Finally, re-fit both the 6-way and
then 7-way plugs to their
corresponding sockets on the left
side of the burner. Ensure that both
plugs are fully pushed home until
the small catch clicks into place.
Refer to Figure 10-9.
10.8 Lighting the Boiler
Ensure that the electrical supply to the
hopper and boiler is switched on
connected and that the heating system
controls are operating and are calling
for heat.
Set the burner ON/STANDBY switch to
ON. The flue fan will start and pellets
will be delivered to the burner.
Refer to Section 9.1 for details of the
burner start-up, running and shut down
sequences.
After completing the start-up sequence,
the burner should be firing at maximum
output and the display on the burner
control shows ‘BURNER FIRING
100%’.
10.9 Combustion Chamber
Draught
10.9.1 Burn Back Thermostat
The combustion chamber draught must
be checked and adjusted (where
necessary) as follows:
• Allow the boiler to run for a period
of 15 minutes, until the boiler and
flue system are warmed up.
• Ensure the burner display is
showing ‘BURNER FIRING 100%’.
• Remove the screw from the draught
test point, located to the left of the
burner on the combustion chamber
door. Refer to Figure 10-12.
• After setting the zero on the
draught gauge, insert the end of the
draught gauge sample tube into the
test point on the door. Ensure that it
is pushed through the door
insulation and into the combustion
chamber.
• A draught reading of between 0.1
and 0.15mbar is required (0.04 and
0.06 in.wg).
10.9.2 Draught Stabiliser Adjustment
To adjust the combustion chamber
draught reading, re-position the weight
on the stabiliser door arm as follows:
• To increase draught – move the
weight away from the damper (or
add extra weights if necessary –
see right).
• To decrease draught –move the
weight closer to the damper.
Refer to Figure 10-13.
If it is necessary to increase the
draught, but the weight fitted is already
at the end of the damper arm, extra
slotted disc weights (supplied with the
boiler) can be used.
These weights are fitted on the ‘flue
end’ of the damper arm, as follows:
• Slacken the grub screw and slide
the fitted weight along the arm
towards the damper.
• Fit one of the slotted weights onto
the arm.
• Secure by inserting a flat bladed
screwdriver into the slot and
twisting it. Refer to Figure 10-14.
• Slide both the weights to the end of
the shaft and secure by tightening
the grub screw in the fitted weight.
Refer to Figure 10-15.
Repeat this process as necessary to
achieve the required draught.
!
NOTE
If the boiler ON/STANDBY switch is
set to STANDBY during the initial
pellet pre-load period, the pellet feed
will continue until the pre-load is
complete. The burner will then
complete the shut-down sequence
before it can start-up again, even if
the ON/STANDBY switch is reset to
ON.
If the ON/STANDBY switch is set to
STANDBY during the start-up
sequence, but AFTER the pre-load is
finished, then the burner will
immediately enter and complete the
shut-down sequence before it can
start-up again, even if the
ON/STANDBY switch is reset to ON.
Ensure the pellet delivery hose forms
an air tight seal each end and that
the hose is not damaged. Leakage of
air could cause increased
temperature in the pellet delivery
hose and result in the burn-back
thermostat shutting down the burner.
!
WARNING
Figure 10-12: Draught test point
Figure 10-13: Draught stabiliser arm
Figure 10-14: Fitting slotted disc weight
Figure 10-15: Draught stabiliser weights
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