Beretta CIAO AT 29 C.S.I. Installer And User Manual page 7

Winter: turn the function selector in the area marked with + and - (fig.
24b) to obtain DHW and heating. In case of a heat request, the boiler
will switch on and the digital display will show the temperature of the
heating water, the heating mode icon and the flame icon (fig. 25).
In case of a request for domestic hot water, the display (1 - fig. 3) will
show the temperature of the domestic water, the DHW mode icon and
the flame icon (fig. 26).
Adjustment of the heating water temperature
To adjust the heating water temperature, turn the knob with the
symbol (fig. 27) clockwise in the area marked with + and -.
Summer: turn the selector onto the summer symbol
to activate the traditional function of domestic hot water only. In the
case of a request for domestic hot water, the display will show the
temperature of the domestic water, the DHW mode icon and the flame
icon (fig. 26).
Pre-heating (faster hot water): turn the domestic water temperature
adjustment knob (fig. 29) onto the
function. The display will show the fixed
hot water temperature adjustment knob back to the required position.
This function keeps the water in the domestic hot water exchanger hot,
to reduce standby times when a request is made. The display indicates
the outlet temperature of the heating water or the domestic hot water
based upon the request in progress. During burner ignition following a
pre-heating request, the display shows the flashing
flame icon (fig. 30). To deactivate the pre-heating function, rotate the
domestic 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 activated when the boiler
is OFF: function selector on
Adjusting the domestic hot water temperature
To adjust the domestic water temperature (bathrooms, showers,
kitchen, etc.), turn the knob with the
marked with + and -. The boiler remains in standby until the burner
ignites in response to a heat request. The display shows the domestic
water temperature, the DHW mode icon and the flame icon (fig. 26).
The boiler continues to function until the temperatures set on the boiler
are reached, or the heat request terminates; it will then go back to
standby. If the digital display shows the
means the boiler is in a temporary stop condition (see the "Operating
status and faults" chapter) (fig. 31).
Environment Automatic Adjustment System function (S.A.R.A.)
By setting the heating water temperature selector in the area marked
with AUTO (fig. 32) (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 ambient thermostat.
When the temperature set with the heating water temperature selector
is reached, a 20-minute count begins. If the ambient thermostat still
requests heat during this period, the value of the set temperature
automatically increases by 5°C. When the new value is reached,
another 20-minute count begins. If the ambient thermostat still requests
heat during this period, the value of the set temperature automatically
increases by 5°C. This new temperature value is the result of the
temperature set manually with the heating water temperature selector
and the increase 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 ambient thermostat is met.
Reduced Condensation Formation function
Positioning the adjusting DHW and CH temperature selector to the
"FCR" (reduced condensation formation, fig. 33) zone, the highest
delivery temperatures will be selected.
4.3 Switching off
Temporary switch-off
In the event of short periods of absence, set the function selector to
(OFF) (fig. 34). The display will switch off. In this way (leaving the
electricity and fuel supplies enabled), the boiler is protected by the
following systems:
- Heating anti-freeze: this function is activated if the temperature
measured by the delivery probe drops below 5°C. In this phase, the
circulator is activated. If the boiler is not in lockout, the burner is also
activated at minimum output until the delivery water temperature
reaches 35°C. During the anti-freeze cycle, the symbol
appears on the digital display.
- DHW anti-freeze: the function is activated if the temperature
measured by the domestic water probe drops below 5°C. In this
phase, the circulator is activated. If the boiler is not in lockout, the
burner is also activated at minimum output until the delivery water
temperature reaches 55°C.
symbol to activate the pre-heating
symbol. Bring the domestic
symbol and the
OFF (fig. 34).
symbol (fig. 28) in the area
icon and an alarm code, this
During the anti-freeze cycle, the symbol
display (fig. 35).
- Circulator anti-blocking: an operation cycle is activated every 24
hours after the last heat request.
Switching off for long periods
In the event of lengthy periods of absence, set the function selector to
(OFF) (fig. 34). The display will switch off. Turn the main system switch
OFF. Turn off the fuel and water taps of the heating and domestic hot
water system. In this case, anti-freeze device is deactivated: empty the
systems, in case of risk of frost.
(fig. 24a)
4.4 Operating status and faults
The operating status of the boiler is shown on the digital display, below
is a list of the types of displays.
Boiler status
Stand-by
OFF status
ACF alarm lockout module
ACF electronics fault alarm
Limit thermostat alarm
Air pressure switch alarm
Water pressure switch alarm
Anti-overflow pressure switch
alarm
Reed sensor (if the "Condense
neutralizer tray" kit is installed)
NTC domestic water fault
NTC heating fault
Parasite flame
Temporary, pending ignition
Air pressure switch intervention
Water pressure switch
intervention
Calibration
Preheating active function
Preheating heat request
External probe presence
Domestic water heat request
Heat request for heating
Antifreeze heat request
Flame present
Reset function
To restore operation (reset alarms):
Faults A01-02-03
Turn the function selector to
turn it to the required position. If the reset attempts do not reactivate the
boiler, contact the Technical Assistance Centre.
Fault A04
- Insufficient water pressure
Check the pressure value indicated by the water gauge:
if it is less than 0.5 bar, turn the function selector to
34) and adjust the filling tap until the pressure reaches a value
between 1 and 1.5 bar. Then turn the function selector to the
required position. If these pressure drops occur frequently, contact
the Technical Assistance Centre.
- Anti-overflow pressure switch
Position the mode selector on
then turn it to the required position. If the fault persists, contact the
Technical Assistance Centre.
- Full basin (if the "Condense neutralizer tray" kit is installed)
Remove the basin and empty it (following the instructions supplied
with the kit). Once the operations have been completed, replace the
basin. Turn the function selector to
and then turn it to the required position. If the fault persists, contact
the Technical Assistance Centre.
(fig. 35)
Fault A06
The boiler functions normally but does not guarantee a constant
domestic hot water temperature, which remains set at around 50°C.
The intervention of the Technical Assistance Centre is necessary.
Fault A07
Request the intervention of the Technical Assistance Centre.
CIAO AT C.S.I.
appears on the digital
Display Type of alarm
- Signal
OFF None
Definitive lockout
A01
Definitive lockout
A02
Definitive lockout
A03
Definitive lockout
A04
Signal
A06
Temporary stop
A07
Temporary stop
A11
80°C flashing Temporary stop
Temporary stop
flashing
Temporary stop
flashing
Signal
ADJ
Signal
Signal
flashing
Signal
Signal
60°C
80°C Signal
Signal
Signal
OFF (fig. 34), wait 5-6 seconds, then
OFF (fig.
(OFF), wait for 5-6 seconds and
OFF, wait for 5-6 seconds
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