Beretta Mynute Boiler 28/60 B.A.I. Manuel D'installation Et D'utilisation page 17

- Adjust the room thermostat to the required temperature (~20°C).
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 tem-
perature, the icon to indicate the hot water supply and the flame icon.
The boiler will be in function until the adjusted temperature is
reached, afterwards it will be in "standby" again.
Environment Automatic
(S.A.R.A.) fig. 5a
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.
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 satisfied.
Anti-legionellosis function
Legionellosis is an illness that can be caught by breathing in small
drops of water (aerosol) containing the legionellosis bacillus (this
bacterium is found in rivers and lakes all over the world).
The bacterium can be eliminated by heating the storage water to a
temperature of over 50/55 °C.
At least every 2/3 days, therefore, the domestic hot water tempera-
ture selector (knob with symbol
maximum temperature in order to heat the water in the storage
boiler to 60°C and remain at this temperature for at least 5 minutes.
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 boil-
er falls below 5°C, the circulator and, if necessary, the burner are
activated at minimum output levels to bring the water tempera-
ture back to the values for safety (35°C). During the anti-frost
cycle, the symbol appears on the digital monitor.
- Circulator anti-blocking function: an operation cycle is acti-
vated 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
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 A04
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
(fig. 2b) within the area
Adjustment System Function
- fig. 7a) should be moved to
(OFF), wait 5-6 seconds then
(summer mode) or
and adjust the filling tap (B - fig. 10) until the pressure reaches a
value between 1 and 1.5 bar.
Then position the mode selector to the desired position
mer) or (winter).
If pressure drops are frequent, request the intervention of the Tech-
nical Assistance Service.
Fault A06
The boiler operates normally but cannot reliably maintain a con-
stant domestic hot water temperature, which remains set at around
50°C. Contact the Technical Assistance Centre.
Fault A07
Contact the Technical Assistance Centre.
BOILER STATUS
Stand-by
OFF status
ACF module lockout alarm
ACF electrical fault alarm
Limit thermostat alarm
Fumes thermostat
H O pressure switch alarm
2
NTC water tank fault
NTC heating fault
Parasite flame
Electric calibration min and max heating
Transient awaiting ignition
H O pressure switch intervention
2
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 conver-
sion, 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 (fig. 4)
- Unscrew by two turns the screw of the pressure test point down-
stream the gas valve and connecting the pressure gauge
4.5.1 Maximum power and minimum domestic hot water ad-
justment
- Fully open the hot water tap
- On the control panel:
- set the mode selector to
- turn the domestic hot water temperature selector to its maxi-
mum (fig. 7a)
- Power the boiler setting the system main switch to "on"
- Check that the pressure on the pressure gauge is stable; or with
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. 11)
(winter
- With a fork spanner CH10 use the adjustment nut of the maxi-
mum output in order to obtain the value indicated in table "Tech-
nical data"
- Disconnect the modulator faston
.
- Wait until the pressure on the pressure gauge is stable at mini-
mum value
(OFF)
Mynute Boiler B.A.I.
DISPLAY
-
OFF
A01
A01
A02
A03
A04
A06
A07
A11
ADJ
88°C
flashing
flashing
60°C
80°C
(summer) (fig. 2a)
(sum-
17