Maintenance - Beretta MYNUTE GREEN E Installer And User Manual

ENGLISH
4.8 Gas conversion (fig. 22)
Gas conversion from one family of gases to another can also be
easily performed when the boiler is installed.
This operation must be carried out by professionally qualified per-
sonnel. The boiler is designed to operate with methane gas (G20)
according to the product label.
It is possible to convert the boiler to propane gas, using the special kit.
For disassembly, refer to the instructions below:
- switch off the power supply to the boiler and close the gas tap
- remove in sequence: housing and air distribution box cover
- remove the fixing screw from the instrument panel
- unhook and turn the instrument panel forwards
- remove the gas valve (A)
- remove the nozzle (B) inside the gas valve and replace it with the
nozzle from the kit
- refit the gas valve
- remove the silencer from the mixer
- open the two half-shells by prising apart the corresponding hooks (C)
- replace the air diaphragm (D) in the silencer
- refit the air distribution box cover
- re-power the boiler and turn on the gas tap
Adjust the boiler as described in the chapter entitled "Adjustments"
with reference to the information on LPG.
Conversion must be carried out by qualified personnel.
Once the conversion is complete, affix the new identifi-
cation label supplied in the kit.
4.9 Checking the combustion parameters (fig. 21)
Mynute Green C.S.I. E:
To carry out the combustion analysis, proceed as follows:
- set the mode selector to the "OFF" position
- rotate the domestic hot water temperature adjustment knob (4 -
fig. 1a) to the symbol (fig. 5a),
Live electrical parts (230 V AC).
- Wait for burner ignition (about 6 seconds). The display shows
"ACO", the boiler operates at maximum heat output
- insert the analyser probe in the ports provided in the air distribu-
tion box, after removing the screws from the cover
- check that the CO2 values match those given in the table, if the
value shown is different, change it as indicated in the chapter
entitled "Gas valve calibration".
- perform the combustion check.
Then:
- remove the analyser probe and close the sockets for combustion
analysis with the special screw
The flue gas analysis probe must be fully inserted as far
as possible.
IMPORTANT
- Even during the combustion analysis phase, the function that
switches the boiler off when the water temperature reaches the
maximum limit (about 90°C) remains enabled
- The combustion analysis function remains active for 15 minutes;
it is possible to interrupt it in advance moving the mode selector
to the desired position, bring the domestic hot water temperature
adjustment knob back to the required position.
Mynute Green R.S.I. E:
To carry out the combustion analysis, proceed as follows:
- 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
- using a small screwdriver included, press the CO button (fig. 8)
Live electrical parts (230 V AC).
- Wait for burner ignition. The display shows "ACO", and the boiler
operates at maximum heat output.
- insert the analyser probe in the ports provided in the air distribu-
tion box, after removing the screws from the cover
- check that the CO2 values match those given in the table, if the
value shown is different, change it as indicated in the chapter
entitled "Gas valve calibration".
- perform the combustion check.
14
Then:
- remove the analyser probe and close the sockets for combustion
analysis with the special screw
- close the cover and refit the housing
The flue gas analysis probe must be fully inserted as far
as possible.
IMPORTANT
Even during the combustion analysis phase, the function that
switches the boiler off when the water temperature reaches the
maximum limit (about 90°C) remains enabled.

5 MAINTENANCE

The appliance must be systematically controlled at regular inter-
vals to make sure it works correctly and efficiently and conforms to
legislative provisions in force.
The frequency of controls depends on the conditions of installation
and usage, it being anyhow necessary to have a complete check
carried out by authorized personnel from the Servicing Centre ev-
ery year.
- Check and compare the boiler's performance with the relative
specifications.
Any cause of visible deterioration must be immediately identified
and eliminated.
- Closely inspect the boiler for signs of damages or deterioration,
particularly with the drainage and aspiration system and electri-
cal apparatus.
- Check and adjust – where necessary – all the burner's param-
eters.
- Check and adjust – where necessary – the system's pressure.
- Analyze combustion. Compare results with the product's specifi-
cation.
Any loss in performance must be identified and corrected by find-
ing and eliminating the cause.
- Make sure the main heat exchanger is clean and free of any
residuals or obstruction.
- Check and clean – where necessary – the condensation tray to
make sure it works properly.
IMPORTANT: always switch off the power to the appliance and
close the gas by the gas cock on the boiler before carrying out any
maintenance and cleaning jobs on the boiler.
Do not clean the appliance or any latter part with flammable sub-
stances (e.g. petrol, alcohol, etc.).
Do not clean panelling, enamelled and plastic parts with paint sol-
vents.
Panels must be cleaned with ordinary soap and water only.