Gas Valve Calibration - Beretta MySmart 28 C.S.I. Para El Instalador

GAS VALVE CALIBRATION

- Electrically power the boiler.
- Open the gas tap.
- Set the mode selector to
- Remove the shell, turn the instrument panel upside down and
remove the electrical parts inspection cover to access the "CO"
button.
Press the "CO" button once.
b
Live electrical parts.
- Wait for the burner to ignite. "ACO" appears on the display. The
boiler operates at maximum heating output.
The "combustion analysis" function remains active for a limited
time of 15 minutes; if a delivery temperature of 90°C is reached the
burner will extinguish. It will reignite when this temperature drops
below 78°C.
- insert the analyser probes in the prescribed positions on the air box
after removing the screws and the cover.
- Press the "combustion analysis" button a second time to reach the
number of revolutions that corresponds to the maximum domestic
hot water output (table 1).
- Check the CO value: (table 4) if the value does not comply with
2
the indications in the table act on the gas valve max adjustment
screw (fig. 45).
- Press the "combustion analysis" button a third time to reach the
number of revolutions that corresponds to the minimum output
(table 2).
- Check the CO value: (table 5) if the value does not comply with
2
the indications in the table act on the gas valve min adjustment
screw (fig. 45).
b
If the CO values do not correspond to the values in the multigas
2
table, make further adjustments.
- To exit the "combustion analysis" function turn the command knob.
- Extract the gases analysis probe and refit the plug.
- Close the instrument panel and reassemble the shell.
The "combustion analysis" function automatically deactivates if the
card generates an alarm. In the event of a fault during the combustion
analysis phase, carry out the reset procedure, acting on the mode
selector as described in section 4.4.
Table 1
Maximum domestic hot
water fan rotations
28 C.S.I.
Table 2
Minimum number of fan
rotations
28 C.S.I.
Table 3
Maximum number of
heating fan rotations
28 C.S.I.
Table 4
Max CO
2
28 C.S.I.
Table 5
Min CO
2
28 C.S.I.
Table 6
Slow ignition
28 C.S.I.
OFF/RESET (display off).
Methane Liquid gas
gas (G20) (G31)
61 61
Liquid gas
Methane
gas (G20)
(G31)
12 15
Methane Liquid gas
gas (G20) (G31)
45 45
Methane Liquid gas
gas (G20) (G31)
9.0 10.0
Methane Liquid gas
gas (G20) (G31)
9.0 10.0
Methane Liquid gas
gas (G20) (G31)
37 37
4.8 Gas conversion (fig. 46)
It is easy to transform gas from one family to gas belonging to
another family even with the boiler installed.
This operation must be done by professionally qualified personnel only.
The boiler is supplied to run on natural gas (G20) – see the product
rating plate for details.
The boiler can be transformed to propane gas using a special kit.
Follow the instructions given here below for disassembly:
- Switch off the power to the boiler and turn off the gas cock.
- Remove cover connections and shell.
- Lift up and rotate the instrument panel.
- Open the air box cover.
- Disconnect the air pressure switch wires.
- Unscrew the 2 screws (A) and remove the bracket and pressure
switch assembly.
- Disconnect the mixer gas ramp (B). Unscrew the clamp screws
and relative mixer springs to fan and then remove it (C).
- Loosen the plastic Venturi (C) by levering from under the teeth (BE
CAREFUL NOT TO FORCE THEM) and press from the opposite
side until it is completely extracted from the aluminium shell.
- Replace the plastic Venturi with the one contained in the kit.
- Reassemble the mixer with the flap in a horizontal position and
the spacer springs placed at 120° as shown in the figure.
- Reassemble gas ramp working vice versa.
- Refit the bracket and pressure switch assembly on the mixer and
reconnect the air pressure switch wires.
- Switch on the power to the boiler and turn on gas cock again.
- Check the number of times the fan turns.
- Fill in and stick on the accompanying transformation data label.
- Close the air box cover.
- Close up the instrument panel again.
- Reassemble shell and cover connections.
Programme the "Gas type" parameter and regulate the boiler following
the instructions in the "Adjustments" section.
b
Transformation must be done by qualified personnel only.
b
After completing transformation, regulate the boiler again
following instructions given in the specific paragraph and
apply the new identification label from the kit.
b
Check that flap and Clapet are working correctly (all open
at rated flow, all closed at minimum flow).
rpm
RANGE RATED
This boiler can be adapted to the heating requirements of the system,
in fact it is possible to set the maximum delivery for heating operation
of the boiler itself:
- switch off the power supply
rpm
- setting the heating water temperature selector at the maximum value
- 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
rpm
- insert JP1 jumper
- power up the boiler.
The display shows "ADJ" for about 4 sec.: it is then possible to
change the maximum heating value by means of the heating water
%
temperature selector and the CO button in order to set and confirm
the desired value.
The icon will appear on the display.
Finish the procedure by removing the jumper JP1 to store the set
values.
%
Once the desired output (maximum heating) has been set, note the
value on the table on the back cover.
For subsequent controls and adjustments, refer to the set value.
b
The calibration does not entail the ignition of the boiler. By
rpm
rotating the heating setpoint selector knob, the value expressed
in hundreds (e.g. 25 = 2.500 rpm) is automatically displayed.
The boiler is supplied with the adjustments shown in the table.
Depending on plant engineering requirements or regional flue gas
emission limits it is, however, possible to modify this value, referring
to the graph.
MySMART C.S.I.
13