Cleaning The Water Tank - Beretta Mynute Boiler 28/60 B.A.I. Manuel D'installation Et D'utilisation

ENGLISH
- 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 deactivat-
ed exclusively by the jumper (JP1) (fig. 12).
ADJ appears on the display to indicate that the calibration pro-
cedure 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 pres-
ence of other operation request.
- by inserting the jumper JP1, with the mode selector in winter po-
sition, without heat request in progress.
By activating the function the burner is ignited through simu-
lation of heat request in heating.
To perform calibration operations, proceed as follow:
- switch off the boiler
- remove the shell and access the card
- insert the jumper JP1 (fig. 12) to enable the knobs placed on the
control panel to the minimum and maximum heating adjustment
functions.
- make sure that the mode selector is in winter position (see sec-
tion 4.2).
- power the boiler
Electric card in voltage (230 Volt)
- turn the heating water temperature adjustment knob B (fig. 13)
until it reaches the minimum heating value as indicated in the
multigas table
- insert the jumper JP2 (fig. 12)
- turn the domestic hot water temperature adjustment knob C (fig.
13) until it reaches the maximum heating value as indicated in
the multigas table
- remove the jumper JP2 to store the maximum heating value
- remove the jumper JP1 to store the heating minimum value and
to get out the calibration procedure.
Disconnect the pressure gauge and retighten the pressure test
point screw.
To finish the calibration function without storing the set
values, proceed as follows:
a) set the mode selector to position
b) remove power supply voltage
c) remove JP1/JP2
The calibration function is automatically finished, without
storing minimum and maximum values, after 15 minutes of
its activation.
The function is automatically finished also in case of definitive
stop or lockout.
Also in this case, function conclusion DOES NOT provide val-
ues storing.
Note
To calibrate only maximum heating, it is possible to remove the
jumper JP2 (to store the maximum) and then get out from the func-
tion, without storing the minimum, setting the mode selector to
(OFF) or removing the voltage from the boiler.
After each intervention on the adjustment element of the
gas valve, seal it with sealing varnish.
When adjustment is complete:
- restore set temperature with the room thermostat to the desired
temperature
- set the heating water temperature selector to the desired position
- close the instrument panel
- pull the shell back in place.
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4.6 Gas conversion operations
Conversion from a family gas to other family gas can be performed
easily also when the boiler is installed.
The boiler is designed to operate with methane gas (G20) accord-
ing to the product label.
It is possible to convert the boilers from one gas type to another by
using the appropriate kit supplied upon request:
- Methane conversion kit
- LPG conversion kit.
For disassembly refer to instructions below:
- remove power supply from the boiler and close the gas tap
- remove the components to access to the internal parts of the
boiler (fig. 15)
- disconnect the spark plug cable connection
- remove the burner fixing screws and remove the latter with the
spark plug attached and corresponding cables
- using a socket or fork spanner, remove the nozzles and the
washers and replace them with the ones in the kit
- reinsert the burner in the combustion chamber and tighten the
screws fixing it to the gas manifold
- restore connection of the spark plug cable
- overturn the control instrument panel towards the boiler front part
- open the card cover
- on the control card (fig. 12):
- if the conversion is from methane gas to LPG, insert the jumper
- if the conversion is from LPG to methane gas, remove the
- reposition the components previously removed
- restore voltage to the boiler and reopen the gas tap (with boiler in
operation, check correct seal of the gas feeding circuit connections).

4.7 Cleaning the water tank

After removing the flange it will be possible to inspect and clean
inside the water tank and check the condition of the magnesium
anode (fig. 16).
- Turn off the hot water system stopcock and empty the water tank
through the drainage device
- Loosen the nut and extract the anode (1)
- Remove the nuts (2) blocking the external flange (3) and extract it
(OFF)
- Clean the inside surfaces and remove all the debris through the
opening
- Check the wear conditions of the magnesium anode (1), replace
if necessary
- Check that the gasket (4) is in good condition after extracting it
from the inside flange (5), replace if necessary.
Complete the work of cleaning, re-mount the components working
the other way round to above description.
Use and assemble the washers contained in the kit also
in case of manifolds without washers.
in position JP3
jumper from position JP3
Conversion must be carried out by qualified personnel.
After conversion, adjust the boiler again following the indica-
tions in specific section and apply the new identification label
contained in the kit.