11
ASH REMOVAL
Some attention should be paid to the amount of ash
that is allowed to build up in the firebox. Wood has
better burning characteristics if a bed of ash is
allowed to build up, riddling only being necessary to
level up the fire (for cooking, for example). Coal or
smokeless fuels, on the other hand, burn better if
they are well riddled to allow a good airflow to the
fire. For slow combustion it is better to have a
thicker ash bed for all fuels. Therefore, do not riddle
the fire before slowing it down for overnight burning,
but riddle it if required in the morning or before
cooking.
When using anthracite or coal avoid excessive firing
conditions. High temperatures are unnecessary and
can do serious harm to the cooker. The first
indication that overheating is taking place will be the
formation of clinker (melted ash) in the firebox and
this should be removed immediately otherwise
damage will occur to the firebars and cooker
components and any damage here should be
repaired without delay.
ASHPAN
The ashpan must be emptied as required otherwise
ash will build up to a point where it interferes with the
natural flow of cool air through firebars and as a
consequence these will be damaged.
THERMOSTAT WITH MANUAL OVERRIDE
The air supply to the fire is controlled by the
thermostat probe inserted into the boiler and the
control knob attached to the ash door.
The automatic thermostat has 6 settings which
control the heat to which the boiler water will rise for
central heating purposes. Setting 0 will close the
thermostat, setting 3 will give a nominal burning rate
of 2
1
/
2
to 3kg per hour of house coal. Setting 5 will
give maximum water heating and high oven
temperatures.
The thermostat will close down when the water heat
reaches the temperature chosen by the selected
setting, it will close fully when the water temperature
reaches 90 - 95
o
C when set at 5 - to prevent boiling.
(See Fig. 9 & 10)
The thermostat manual override has 4 settings
which retain the air flap in a predetermined open
position for steady heat when baking and cooking. It
will only close fully when the water temperature
reaches 90 - 95
o
C when set at 5 - to prevent boiling.
OVERNIGHT BURNING
There is a small air bypass into the ashdoor and this
is normally sufficient when the thermostat is closed
to hold the fire at least 10 hours after banking. If the
fire is out and the fuel unburned set the control knob
of the thermostat from
1
/
2
to 1 in order to sustain
overnight burning.
FIREDOOR SPIN VALVE
Fig.9
Fig.10
Fig.11
