Dimplex XLS12N Operating Instructions page 2

XLSN Storage heater - Principle of operation
Your XLSN heater consists of a core of high density heat
storage bricks surrounded by a carefully designed insulating case.
During off-peak periods elements within the brick core heat up the
bricks to a temperature level determined by the setting you select
using the input control knob and the prevailing weather conditions.
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 insuffi 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 temperature of the room at the end of the charge period, as measured by the heater's built-
in room temperature sensor.
With the Output Control Knob set to minimum (fully anticlockwise) for domestic use, or maximum (fully clockwise) for commercial
applications, the Input Control Knob should initially be set at the mid point position. During the day following the fi rst charge period
the comfort level provided by the heater should be noted. If it is felt that the level of heating is either too high or too low, then the
Input Control Knob should be adjusted up or down as appropriate before the next charge period. This process should be repeated
each day until the most acceptable conditions are attained. The Input Control knob should then be left at this setting, and the heater
will automatically vary the charge taken in during subsequent charge periods to make the most effective use of off-peak electricity to
provide the selected level of comfort at the end of each charge period.
In the Autumn and Spring a lower setting of the Input Control Knob should be suffi cient, the actual setting required being infl 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.