Beretta Mynute Green E 25 C.S.I. Installer And User Manual page 14

ENGLISH
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 (G31) using the
special kit supplied.
For disassembly, refer to the instructions provided below (fig. 46):
- remove power supply from the boiler and close the gas tap
- remove in the following order: shell and air box cover
- unhook the instrument panel and turn it forward
- remove the gas train (A)
- remove the nozzle (B) - Fig.- contained in the gas train, and re-
place it with the one contained in the kit
- refit the gas train (ensure that the gas train connected to the fan
mixer is in position)
- refit the air box cover
- power-up the boiler and open the gas tap.
Adjust the boiler following the description in chapter 4.7 "Adjust-
ments" referring to the data relative to the gas in question (G31).
Conversion must be carried out by qualified personnel.
After completing the gas conversion apply the new identifica-
tion label contained in the kit.
5 - REGULAR
To ensure product characteristics and efficiency remain intact and
to comply with prescriptions of current regulations, it is necessary to
render the appliance to systematic checks at regular intervals.
When carrying out maintenance work, observe the instructions given
in chapter 1 "Warnings and safety".
Turn off the appliance before carrying out work or maintenance of
structures near the flue discharge connections and/or fume dis-
charge devices and their accessories. Once work is completed, a
qualified technician must check the efficiency of the appliance.
IMPORTANT
Before carrying out any cleaning or maintenance work on the appli-
ance, use appliance and system switches to interrupt power supply
and close the gas supply turning the tap placed on the boiler.
5.1 Routine maintenance
This normally means the following tasks:
- removing any oxidation from the burner;
- removing any scale from the heat exchangers;
- checking and cleaning the drainage pipes;
- checking the external appearance of the boiler;
- checking the ignition, switch-off and operation of the appliance, in
both domestic water mode and heating mode;
- checking the seal on the gas and water couplings and pipes;
- checking the gas consumption at maximum and minimum output;
- checking the position of the ignition-flame detection glowplug;
- check the "no gas" safety system;
- check operation of the check valve if it is installed (see section 3.10
"Installation on collective flues in positive pressure").
Do not clean the appliance or its parts with easily inflammable sub-
stances (e.g. benzine, alcohol, etc.).
Do not clean panels, painted parts and plastic parts with paint thinner.
Panel cleaning must be carried out only with soapy water.
5.2 Extraordinary maintenance
These tasks restore appliance operation in accordance with the de-
sign and regulations - e.g. following the repair of an accidental fault.
This normally means:
- replacement
14
- repair
- overhaul of components.
These tasks require special means, equipment and tools.
During the initial installation phase, or in the event of extraor-
dinary maintenance, you are advised to activate the procedure
to discharge air from the heating circuit and boiler (see section
3.3).
5.3 Checking the combustion parameters
To carry out the combustion analysis, proceed as follows:
- Set the mode selector to
- Turn the domestic hot water temperature selector to the
(fig. 47)
- Wait for the burner to ignite (about 6 seconds). The display shows
"ACO" and the boiler operates at maximum heating output
- Remove the screw C and the cover E on the air box (see fig. 48)
- insert the analyser probes in the prescribed positions on the air box
The flue gas analysis probe should be inserted until its reaches
the stop.
- Check that the CO values correspond to the ones indicated in the
2
tables shown below"; if the value shown is different proceed with
changes as indicated in the "Gas valve calibration" chapter.
Max CO
2
gas (G20)
25 C.S.I.
30 C.S.I.
Min CO
2
gas (G20)
25 C.S.I.
30 C.S.I.
- Perform the combustion check.
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.
- If you want to interrupt the procedure turn the domestic hot water
temperature selector so that it is within the + and - symbols.
Subsequently:
- remove the analyser probe and close the combustion analysis inlet
- close the instrument panel and refit the shell
When checks are completed:
- Position the knobs depending on the type of operation desired.
6 - CIRCULATOR SETTINGS
Circulator residual discharge head
The boilers is equipped with an already hydraulically and electrically
connected circulator, whose useful available performance is indicat-
ed in the graph.
The circulator comes set from the factory with a 6 metre discharge
head curve.
The boiler is equipped with an anti-blocking system which starts up
an operation cycle after every 24 hours in standby with the mode
selector in any position.
The "antiblocking" function is active only if the boiler is electri-
cally powered.
Operating the circulator without water is strictly forbidden.
If you need to use a different curve you can select the desired level
on the circulator.
Below the main characteristics and the ways to set up their desired
operation are listed.
User interface
The user interface is made up of a button (A), a two-coloured red /
green LED (B) and four yellow LEDs (C) arranged in a row (fig. 49).
The user interface allows the operating performance to be viewed
(operating status and alarm status) and it also allows the circulator
operating modes to be set.
to switch off the boiler (fig. 47)
Methane Liquid gas
(G31)
9.0 10.0 %
9.0 10.0 %
Methane Liquid gas
(G31)
9.0 10.0 %
9.0 10.0 %
position