Cleaning The Water Tank; Checking The Combustion Parameters; Important - Beretta MYNUTE BOILER GREEN 25 B.S.I. E Para El Instalador

ENGLISH
Mynute Green 25 B.S.I. E
HTG curve (Qnheating)
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
4 6 8 10
Heat output (kW)
COs.a. curve (Qnheating)
150
140
130
120
110
100
90
80
70
60
50
40
4 6 8 10
Mynute Green 32 B.S.I. E
HTG curve (Qnheating)
5200
5000
4800
4600
4400
4200
4000
3800
3600
3400
3200
3000
2800
2600
2400
2200
2000
1800
1600
1400
1200
5 6 7 8 9 10 11 12
Heat output (kW)
COs.a. curve (Qnheating)
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
5 6 7 8 9 10 11 12
Heat output (kW)
12
12 14 16 18 20 22
12 14 16 18 20 22
Heat output (kW)
13 14 15 16 17 18 19 20 21 22 23
13 14 15 16 17 18 19 20 21 22
4.8 Gas conversion (fig. 18)
It is easy to convert from one gas family to another even after the
boiler has been installed. This operation must be performed by
professionally qualified staff. The boiler is designed to work with
natural gas. The product plate indicates which fuel it has been fit-
ted out to use.
It is possible to convert the boiler from one kind of gas to the other
using kits which can be supplied on request:
- natural gas to LPG conversion kit
- LPG to natural gas conversion kit.
To disassemble, proceed as follows:
- disconnect the boiler from the power supply and close the gas
tap
- remove the components to access to the internal parts of the
boiler
- remove the gas ramp (A)
- remove the nozzle (B) contained inside the gas ramp and re-
place it with the one contained in the kit
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- remount the gas ramp
- remount components previously removed
- power the boiler and open the gas tap (with the boiler working,
check there are no leaks in the gas supply circuit).
Programme the "Gas type" parameter and adjust the boiler as
described in the "Adjustments" chapter.
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 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. 20).
- Turn off the hot water system stopcock and empty the water tank
through the drainage device
- Loosen the nut and extract the anode (1)
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- Remove the nuts (2) blocking the external flange (3) and extract it
- 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.

4.10 Checking the combustion parameters

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. 9)
Live electrical parts (230 Vac).
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- 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 (fig. 19)
- 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
- 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
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