Ignition And Operation; Preliminary Checks - Beretta Mynute S 24 C.S.I. Manuel D'installation Et D'utilisation

- close the main tap of the water mains
- open all the hot and cold water taps
- empty the lowest points.
WARNING
When carrying out the discharge of the safety valve (N), it must be
connected to a suitable collection system. The manufacturer is not
responsible for possible damages due to safety valve operation.

4 - IGNITION AND OPERATION

4.1 Preliminary checks

First ignition is carried out by competent personnel from an autho-
rised Technical Assistance Service Beretta.
Before starting up the boiler, check:
a) that the supply networks data (electric, water, gas) corresponds
to the label data
b) that piping leaving the boiler is covered by thermal insulation
sheath
c) that fl ue gas extraction and air suction pipes work correctly
d) that conditions for regular maintenance are guaranteed if the
boiler is placed inside or between furniture
e) the seal of the fuel adduction system
f) that fuel capacity corresponds to values requested by the boiler
g) that the fuel supply system has the correct capacity for the nec-
essary capacity to the boiler and that it has all the safety and
control devices prescribed by current regulations.
4.2 Appliance ignition
To start-up the boiler it is necessary to carry out the following op-
erations:
- power the boiler
- open the gas tap present in the system to allow fuel fl ow
- turn the mode selector (3 - fi g. 1a) to the desired position:
Mynute S C.A.I. E - C.S.I.:
Summer mode: turning the selector to the symbol summer
2a) the traditional function of only domestic hot water is activated.
If there is a domestic hot water request the digital display shows
the hot water system temperature, the icon to indicate the hot water
supply and the fl ame icon
Winter mode: by turning the mode selector within the area marked
+ and - (fi g. 2b), the boiler provides domestic hot water and heat-
ing. If there is a heat request, the boiler switches on and the digital
monitor indicates the heating water temperature, the icon to indi-
cate heating and the fl ame icon (fi g. 3a). If there is a domestic hot
water request, the boiler switches on and the digital display shows
the hot water system temperature, the icon to indicate the hot water
supply and the fl ame icon (fi g. 4a)
Pre-heating (faster hot water): rotate the domestic hot water tem-
perature adjustment knob (4 - fi g. 1a) to the
to activate the pre-heating function. This function keeps the water
in the domestic hot water exchanger hot, to reduce standby times
when a request is made. When the pre-heating function is enabled,
the monitor indicates the delivery temperature of the heating water
or the domestic hot water, according to the current request. During
burner ignition following a pre-heating request, the monitor indi-
cates the symbol (fi g. 5b).
To deactivate the pre-heating function, rotate the domes-
tic hot water temperature adjustment knob back to the
symbol. Bring the domestic hot water temperature adjustment
knob back to the required position. This function cannot be activat-
ed when the boiler is OFF: function selector (3 fi g.1a) on
Mynute S R.S.I.:
Summer mode (only with the external water tank connected):
turning the selector to the symbol summer
tional function of only domestic hot water is activated and the boiler
supplies water at the temperature set on the external storage tank.
If there is a domestic hot water request the digital display shows
the hot water system temperature, the icon to indicate the hot water
supply and the fl ame icon
Winter mode: by turning the mode selector within the area marked
+ and - (fi g. 2b), the boiler provides hot water for heating and - if
connected to an external storage tank - domestic hot water. If there
is a heat request, the boiler switches on and the digital monitor in-
dicates the heating water temperature, the icon to indicate heating
and the fl ame icon (fi g. 3a). If there is a domestic hot water request,
the boiler switches on and the digital display shows the hot water
system temperature, the icon to indicate the hot water supply and
the fl ame icon (fi g. 4a).
Adjust the room thermostat to the required temperature (~20°C).
Adjustment of the heating water temperature
To adjust the heating water temperature, turn the knob with symbol
Mynute S C.A.I. E - C.S.I.: Adjustment of domestic hot water
temperature
To adjust domestic water temperature (bathrooms, showers, kitch-
en, etc.), turn the knob with symbol
marked + and -.
The boiler is standby status until, after a heat request, the burner
switches on and the digital display shows the hot water system
temperature, the icon to indicate the hot water supply and the fl ame
icon.
The boiler will be in function until the adjusted temperature is
reached, afterwards it will be in "standby" again.
Mynute S R.S.I.: Adjustment of the domestic hot water tem-
perature
CASE A heating only - adjustment does not apply
CASE B heating only + external storage tank with thermostat - ad-
justment does not apply.
CASE C heating only + external storage tank with probe - to adjust
the temperature of the domestic hot water in the storage tank, turn
the knob-but with the symbol clockwise to increase water tempera-
ture and anti-clockwise to lower it.
The boiler is standby status until, after a heat request, the burner
switches on and the digital display shows the hot water system tem-
perature, the icon to indicate the hot water supply and the fl ame icon
The boiler will be in function until the adjusted temperature is
reached, afterwards it will be in "standby" again.
(fi g.
Environment
(S.A.R.A.) fi g. 7a
By setting the heating water temperature selector to the area
marked by AUTO - temperature value from 55 to 65°C - the
S.A.R.A. self-adjusting system is activated: the boiler varies the
delivery temperature according to the closing signal of the room
thermostat. When the temperature set with the heating water tem-
perature selector is reached, a 20 minutes count begins. If during
this period the room thermostat still requests heat, the value of the
set temperature automatically increases by 5 °C.
When the new value is reached, other 20 minutes count begins.
If during this period the room thermostat still requests heat, the
value of the set temperature automatically increases by 5 °C.
symbol (fi g. 5a),
This new temperature value is the result of the temperature set
manually with the heating water temperature selector and the in-
crease of +10 °C of the S.A.R.A function. After the second cycle the
temperature value should be kept at the set value +10°C until the
request of the room thermostat is satisfi ed.
4.3 Switching off
Temporary switching off
In case of absence for short periods of time, set the mode selector
(3 - fi g. 1a) to
In this way (leaving the electricity and fuel supplies enabled), the
OFF.
boiler is protected by the following systems:
- Anti-frost device: when the temperature of the water in the boiler
falls below 5°C, the circulator and, if necessary, the burner are
activated at minimum output levels to bring the water tempera-
(fi g. 2a) the tradi-
ture back to the values for safety (35°C). During the anti-frost
cycle, the symbol
- Circulator anti-blocking function: an operation cycle is activated
every 24 hours.
- DHW Antifreeze (only when connected to an external storage
tank with probe): the function is activated if the temperature mea-
sured by the storage tank probe drops below 5° C. A heat re-
quest is generated in this phase with the ignition of the burner at
minimum power, which is maintained until the water temperature
reaches 55° C. During the anti-frost cycle, the symbol
on the digital monitor.
(fi g. 3b) within the area marked + and -.
Automatic Adjustment
(OFF).
appears on the digital monitor.
Mynute S
(fi g. 2b) within the area
System Function
appears
7