Ariston MGz I Installation Et Mode D'emploi page 22

GB
preparing the boiler for operation preparing the boiler for operation
The MGz I and MGz II modules are designed to
control single-temperature systems which require
large water fl ow rates and which are divided into
one or two heating zones. These modules may
be combined with all the models in our range of
boilers.
The Clima Manager and room sensor can be used
to control the heating in the 2 zones through
modulating adjustment and, if an outdoor sensor
is installed, through climatic adjustment. For the
devices to be connected, a BUS interface must be
installed directly inside the boiler.
Zone direction
The modulating peripherals (Clima Manager and
room sensor) must be directed to the zone in
which they are installed. For details of the direction
procedure, please refer to the operating manuals of
the peripheral units.
The ON/OFF peripherals must be directed by
connecting them to the boiler in accordance with
the numbering system used on the terminal board.
Operating modes
for the boiler AUTO button (where fi tted):
1. AUTO button switched off
ON/OFF operation with fl ow temperature set-
point adjusted using the heating knob on the
boiler
2. boiler AUTO button switched on
select parameter 4 2 1 to choose the type of
temperature adjustment:
0 fi xed fl ow temperature
1 on/off devices
2 room sensor only
3 outdoor sensor only
4 room sensor + outdoor sensor
If option 0 is selected, the fl ow temperature is
established using parameter 4 0 2.
If option 1 is selected, operation will be on/off
with a fl ow temperature set-point which varies in
accordance with chart "A".
The time "t" (default 16 minutes) can be adjusted
using menu 2 4 4, to a value between 0 and 60
minutes. This is only applicable for the high-
temperature range.
If necessary chart "A" may be shifted upwards or
downwards (± 20°C) in order to vary the fl ow
temperature, either using parameter 4 2 3 (off-
set), or by turning the heating knob on the boiler
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control panel (GENUS), or by pressing the + and
– buttons (CLAS).
If option 2 is selected, operation will be with a
fl ow temperature set-point which is modulated in
accordance with the room temperature.
Selecting option 3 will result in ON/OFF operation
with a fl ow temperature set-point determined by
the curve selected using parameter 4 2 2 (chart
"B").
If necessary the graph may be shifted upwards or
downwards in order to vary the fl ow temperature,
either using parameter 4 2 3 (off-set), or by turning
the heating knob on the boiler control panel (GENUS)
or by pressing the + and – buttons (CLAS).
Selecting option 4 will result in the fl ow temperature
being determined by the climatic adjustment curve
(see chart B), selected using parameter 4 2 2.
Furthermore, parameter 4 2 4 may be used to select
the infl uence of the room sensor on the adjustment
process.
This parameter can be adjusted to a value between
10 (maximum infl uence) and 0 (no infl uence).
This means the contribution of the room
temperature to the fl ow temperature calculation
can be adjusted.
In this manner the temperature adjustment becomes
both climatic and modulating on the indoor sensor,
thereby guaranteeing optimal adjustment of the
room temperature.
The same settings will be recalled for ZONE 2 (menu
5).
Two different curves may be set for the two zones
by adapting the temperature in accordance with
the features of the two systems. While the two
zones are operating at the same time, the fl ow
temperature of the boiler will be the highest of the
two calculated values.