Ecotec A4 Operation And Maintenance page 21

CHECK: Start the burner and check that
both the drive motor and outfeed shaft
and screwshaft turn round in the burn-
ing cup.
ACTION: In the event of a fault, contact
an installation engineer.
CHECK: Whether or not the internal
store's level sensor indicates low fuel
level.
ACTION: Start the burner and check that
the external screw starts and feeds fuel
to the burner. If it does not, the level
sensors have reacted to counter pressure
in the system and stopped the fuel feed.
Open the boiler damper and clean fly ash
from the flues. A poor draught is often
the result of a defective chimney, which
should be dealt with as soon as possible.
Even brick chimneys with large cooled
surfaces and "downdraught" can cause
counter pressure, especially during
warmer times of the year. In this case a
flue gas fan should be installed. Consult
an installation engineer for further ad-
vice.
The alarm text: * Ignition error *
The burner has received a signal to stop
because the optical sensor indicated that
it cannot see light in the combustion
chamber during the ignition sequence.
The burner makes three attempts at
ignition.
ACTION: If the burner is equipped with
hot-air ignition, contact
installation engineer for advice.
For a manual start, check the optical
sensor.
The alarm text: * Error Ext. Feed*
This fault is due solely to a lack of fuel in
the burner's internal store.
CHECK: That there are pellets in the
external store.
ACTION: Fill up with pellets.
CHECK: That the gradient of the screw is
not too sharp (max 45°), or whether the
feed has stopped due to a dip having
formed in the bottom of the external
store.
ACTION: Place the screw at a gentler
angle, and turn it backwards and for-
wards a few times. The location should
be in the middle of the external store.
CHECK: That the external screw's drive
motor functions and that the motor shaft
drives the screw spiral.
ACTION: Test the external motor sepa-
rately for parameters p 11-13. Tighten
the socket head screw on the motor
shaft's bevelled section. In the event of a
motor fault, contact an installation engi-
neer.
CHECK: That the hose to the burner is
not too horizontal.
ACTION: Change the angle so the pellets
do not get stuck.
CHECK: That a dip has not formed in the
internal store.
ACTION: A dip forms in the store only
because the pellets are damp or there are
too many of them. Tap the store. Change
the pellets immediately. Damp pellets
may cause a total stop or breakdown. In
the event of overfilling, you must contact
an installation engineer. A dip may also
form when the store's bottom angle is
too small.
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