XLN Storage heater - Principle of operation
Your XLN heater consists of a core of high density heat storage
bricks surrounded by a carefully designed insulating case. During
the night time off-peak period elements within the brick core heat
up the bricks to a temperature level determined by the setting you
select using the input control knob.
During the following day the heat stored in the brick core is
gradually transmitted through the insulation and out of the heater
case.
In the morning, when the core is at its hottest, the amount
of heat being transmitted through the insulation and emitted
as radiant heat is at its greatest and the heater feels hot over
most of its upper outer surfaces.
Diagram 2.
As the day progresses, heat is transmitted from the heater
to the room and the outer surface of the heater becomes less
hot and the amount of heat released in this way becomes
less.
If the amount of emitted heat becomes insuf
fi
cient the
output of the heater and thus the room temperature may
be increased by means of the Output Control. This control
operates a damper
fl
ap within the heater which, when the
output control knob is at minimum, covers vertical airways
which pass directly through the centre of the core of the
heater. Even when the outer surfaces of the heater are
noticeably less hot, the core of bricks can still be at a
relatively high temperature. Opening the damper
fl
ap by
moving the output control away from minimum allows the
room air to circulate through this hot core and release more
heat to the room by convection.
Diagram 3.
Input Control
The setting of this control determines the amount of charge taken in by the heater, which in turn determines the temperature of the
heater’s storage core. The higher the charge taken the higher the core temperature.
In cold weather the heater should be set to take a high charge. Setting the control at maximum ensures the heater accepts a full
charge.
In the Autumn and Spring a lower setting of the input control knob should be suf
fi
cient, the actual setting required being in
fl
uenced by
the prevailing weather conditions, the room size and insulation levels. The most suitable settings will be found by experience.
Output Control
Depending upon the amount of charge accepted by the heater, the OUTPUT control allows the release of additional heat by
means of a damper which can be opened to allow a greater air
fl
ow through the heater core, and therefore additional circulation of
heat. By altering the setting of the Output control knob the damper may be opened and closed manually, or it may be made to open
automatically.
