9
Mynute Boiler Green B.S.I. E
automatically calculated by the electronic board, turn the heating
water selector (Fig. 3b) clockwise to increase and anticlockwise to
decrease. Adjustment settings range from comfort levels - 5 to + 5
which are indicated on the digital display when the knob is turned.
Adjustment of domestic hot water temperature
To adjust domestic water temperature (bathrooms, showers, kitch-
en, etc.), turn the knob with symbol
(fig. 3b) within the area
and -. The boiler is standby status until, after a heat re-
quest, the burner switches on and the digital display shows the hot
water system temperature, 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 Adjustment System Function
(S.A.R.A.) fig. 6a
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.
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) (fig. 2a).
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 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 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) (fig. 2a).
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 (OFF), wait 5-6 seconds then
set it to the required position (summer mode) or
(winter
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 (OFF)
and adjust the filling tap (I fig. 14) until the pressure reaches a
value between 1 and 1.5 bar.
Then position the mode selector to the desired position (sum-
mer) or
(winter).
If pressure drops are frequent, request the intervention of the Tech-
nical Assistance Service.
Fault A 06
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 A 07
Contact the Technical Assistance Centre.
Fault A 08
Contact the Technical Assistance Centre.
Fault A 09
Position the function selector to (OFF), wait 5-6 seconds then
set it to the required position (summer mode) or
(winter
mode). If the reset attempts do not reactivate the boiler, request
the intervention of the Technical Assistance Service.
Fault A 09
The boiler is equipped with an auto-diagnostic system which, ba-
sed on the total number of hours in certain operating conditions,
can signal the need to clean the primary exchanger (alarm code 09
and flue gas meter >2,500).
Once the cleaning operation has been completed, using the spe-
cial kit supplied as an accessory, the total hour meter will need to
be reset to zero as follows:
- switch off the power supply
- remove the shell
- turning the instrument panel towards you
- unscrew the two screws of the small cover on the electronic
board to have access to the terminals
- while the boiler is powered up, using a small screwdriver includ-
ed, press the CO button (fig. 9) for at least 4 seconds, to check
the meter has been reset, power down then power up the boiler;
the meter reading is shown on the monitor after the “-C-” sign.
Live electrical parts (230 Vac).
Note: the meter resetting procedure should be carried out after
each indepth cleaning of the primary exchanger or if this latter is
replaced. To check the status of the total hour meter, multiply the
reading by 100 (e.g. reading of 18 = 1800 total hours; reading of 1
= 100 total hours).
The boiler continues to operate normally even when the alarm is
activated.
BOILER STATUS
DISPLAY
Stand-by
-
OFF status
OFF
ACF module lockout alarm
A01
ACF electrical fault alarm
A01
Limit thermostat alarm
A02
Air pressure switch alarm
A03
H2O pressure switch alarm
A04
NTC domestic water fault
A06
Primary (flow) thermistor fault - Primary (flow) thermi
-
stor over temperature - Temperature differential
A07
Return thermistor fault - Return thermistor overtem-
perature - Temperature differential inverted
A08
Flue thermistor
or flue thermistor counter fault -
Flue thermistor over temperature
A09
False flame
A11
Low temperature thermostat fault
A77
Calibration
ADJ
Service operation
ACO
Transient awaiting ignition
88
°C
flashing
H2O pressure switch intervention
flashing
Purge cycle mode active
External probe present
Domestic water heat request
60
°C
Heating heat request
80
°C
Anti-freeze heat request
Flame present
