Operating instructions

ATMOS MULTI Mk 2 version 2007
Page
7
• The control system
The appliance is controlled by an electronic control
unit with a display for operating and malfunction
reports.
The appliance also has a continuously modulating
burner control system. A pneumatic mechanical
gas-air connection automatically adjusts the amount
of gas to the amount of combustion air. The control
unit adjusts the speed of the fan to the output
demanded. This provides' perfect output control for
both the central heating and the hot water.
• Most Efficient Start
MES is a comfortable energy saver that keeps the
home at the set temperature as accurately as
possible using the lowest possible output (and
therefore the highest possible efficiency).
When central heating is demanded, the appliance
always starts heating the home on a low burner heat
input. The appliance is switched by a standard
on/off room thermostat system. The amount of time
that the burner remains at low capacity depends on
the heat demand. The control unit constantly
recalculates this low capacity combustion time. The
control system is therefore 'intelligent' in that it
learns from itself.
• Weather dependent control
Using an extra kit available from Atmos,
comprising an external temperature sensor and
a central heating return temperature sensor, the
Multi can be easily controlled in a weather
dependent manner by changing a number of
control settings
2. Operating the Atmos
Multi
• The room thermostat
The central heating is controlled by a room
thermostat*. You can set your room thermostat at the
temperature you require. The room thermostat
switches on the Atmos Multi, which in turn
automatically starts the electronic regulating unit. The
appliance will then use the radiators to heat the home
until the desired temperature is reached. The room
thermostat then switches the appliance off. The room
thermostat will then periodically turn the appliance
on and off so that the home remains constantly at
the desired temper ature.
* Other arrangements are also possible.
• The operating panel
The operating panel of the Atmos Multi is located on
the front of the control unit at the bottom centre of the
appliance. Located on the operating panel are two
displays (see figure 1). The upper one, the
diagnostic display, shows the operating or
malfunction reports. The lower display gives the
current central heating pressure or central heating
water temperature. The hot water on/off switch is
situated at the bottom right of the operating panel.
• Diagnostic display
The number on the diagnostic display indicates the
operating status of the appliance. The various status
reports are explained in Table 1. If, for example, you
see number 1 , it means that there is a hot water
demand at that moment. A dot (e.g. 1. ) after the
number means that the appliance is occupied with
the relevant activity (in this case meeting the water
demand).
The same diagnostic display indicates
malfunctions. Further information on this subject is
given in section 6.
• Central heating water display
The central heating water display indicates the
current central heating water pressure (standard
setting). If the central heating water pressure is too
low or too high, this is indicated by a warning letter
‘C’ on the diagnostic display. Further information
on this subject is given in section 6.
This display can also indicate the central heating
water temperature instead of the central heating
water pressure. See ‘User’s program’ .