Beretta Mynute S 24 C.A.I. E Installations- Und Bedienungsanleitung Seite 7

Environment Automatic
(S.A.R.A.) fig. 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
temperature 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.
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 room thermostat is satisfied.
4.3 Switching off
Temporary switching off
In case of absence for short periods of time, set the mode selector
(3 - fig. 1a) to (OFF).
In this way (leaving the electricity and fuel supplies enabled), the
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
temperature 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.
Long period switching off
In case of absence for long periods of time, set the mode selector
(3 - fig. 1a) to (OFF).
Then, close the gas tap present on the system. In this case, anti-
frost device is deactivated: empty the systems, in case of risk of
frost.
4.4 Light signals and faults (fig. 6a)
The operating status of the boiler is shown on the digital display,
below is a list of the types of displays.
To restore operation (deactivate alarms):
Faults A 01-02-03
Position the function selector to
set it to the required position
mode). If the reset attempts do not reactivate the boiler, contact the
Technical Assistance Centre.
Fault A 04
In addition to the fault code, the digital display shows the symbol
.
Check the pressure value indicated by the water gauge:
if it is less than 0.3 bar, position the function selector to
and adjust the filling tap (L fig. 12) until the pressure reaches a
value between 1 and 1.5 bar.
Then position the mode selector to the desired position
(summer) or (winter).
If pressure drops are frequent, request the intervention of the
Technical Assistance Service.
Fault A 06
The boiler operates normally but cannot reliably maintain a
constant domestic hot water temperature, which remains set at
around 50°C. Contact the Technical Assistance Centre.
Fault A 07
Contact the Technical Assistance Centre.
BOILER STATUS
Stand-by
OFF status
ACF module lockout alarm
ACF electrical fault alarm
Limit thermostat alarm
All manuals and user guides at all-guides.com
Adjustment System
appears on the digital monitor.
(OFF), wait 5-6 seconds then
(summer mode) or
DISPLAY
-
OFF
A01
A01
A02
Function
Fumes thermostat
H O pressure switch alarm
2
NTC domestic water fault
NTC heating fault
Parasite flame
Electric calibration min and max heating
Transient awaiting ignition
Fumes thermostat intervention
H O pressure switch intervention
2
Preheating Function active
Preheating heat request
External probe present
Domestic water heat request
Heating heat request
Anti-freeze heat request
Flame present
4.5 Adjustments
The boiler has already been adjusted by the manufacturer.
If it is necessary to adjust it again, for example after extraordinary
maintenance, after replacement of gas valve or after gas
conversion, carry out the following procedure.
The maximum output adjustment must be carried out in the
sequence indicated exclusively by qualified personnel.
- remove the shell unscrewing the fixing screws A (fig. 6)
- unscrew by two turns the screw of the pressure test point
downstream the gas valve and connecting the pressure gauge
4.5.1 Maximum power and minimum domestic hot
water adjustment
- Fully open the hot water tap
- On the control panel:
- set the mode selector to
- turn the domestic hot water temperature selector to its
maximum (fig. 8a)
- Power the boiler setting the system main switch to "on"
- Check that the pressure on the pressure gauge is stable; or with
(winter a milliammeter in series to the modulator, make sure that the
modulator supplies the maximum available current (120 mA for
G20 and 165 mA for LPG).
- Carefully prise out the protection cap of the adjustment screws,
using a screwdriver (fig. 14)
- With a fork spanner CH10 use the adjustment nut of the maximum
output in order to obtain the value indicated in table "Technical
data"
(OFF)
- Disconnect the modulator faston
- Wait until the pressure on the pressure gauge is stable at
minimum value
- Paying attention not to press the internal shaft, use an Allen
spanner to turn the red adjustment screw for domestic hot water
minimum temperature regulation, calibrating it until the pressure
gauge reads the value indicated in the table "Technical data"
- Reconnect the modulator faston
- Close the domestic hot water tap
- Carefully refit the protection cap of the adjustment screws.
4.5.2 Minimum and maximum heating electric
adjustment
The "electric adjustment" function is activated and deactivated
exclusively by the jumper (JP1) (fig. 15).
ADJ appears on the display to indicate that the calibration
procedure is underway.
The function can be enabled in the following way:
- by powering the card with the jumper JP1 inserted and the mode
selector in winter position, independently from the possible
presence of other operation request.
Mynute S C.A.I. E
A03
A04
A06
A07
A11
ADJ
88°C flashing
flashing
flashing
flashing
60°C
80°C
(summer) (fig. 2a)
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