Maintenance And Cleaning - Beretta MYNUTE X C Series Installer And User Manual

Key 2 can stay active if there is a fault to allow the alarm to be reset.
4.24 Interface Stand by
Usually, when there are no faults or heat requests, the display always shows the temperature
measured by the flow sensor. If within 10 seconds there is no heat request without any key
being pressed the interface goes into stand by. The display shows the current time, the two
points separating the time from the minutes blink with a frequency of 0.5sec ON and 0.5sec
OFF, while the status icons will be active if necessary:
4.25 Replacing interface
The system configuration operations need to be carried out by professionally qualified
personnel of the Technical Assistance Centre.
When replacing the interface board, it might happen that when power up the user is requested
to reset the time and the day of the week (see paragraph "4.5 First commissioning").
Remember that no programming of the configuration parameters is needed, the values are
recovered from the control and adjustment board in the boiler.
You may need to reset the DHW and heating setpoints.
4.26 Replacing the board
When replacing the adjustment and control board it might be necessary to re-programme
the configuration parameters. In this case see the P1 to find the board default values, i
the factory settings and personalised settings. The parameters to be checked and re-set if
necessary in the event of a board replacement are:
P2.01
P2.02
P3.01
P3.02
P3.03
P3.06
P3.07
P3.09
P3.10
4.27 Combustion Control Parameters
Even if the parameters regarding the new ACC active combustion control system are pre-
set in the factory, it might be necessary to re-programme them if the electronic board is
replaced.
ƒ Access the technical parameters as explained in the paragraph "3.22 Access to the
parameters" entering the INSTALLER password.
ƒ Select P2 with the keys and
ƒ Select P2.01.
ƒ Set this parameter based on the type of gas the boiler is using. The values for this
parameter are METHANE = 0 - LPG = 1
ƒ Set the SERVICE password.
ƒ Select the P2 menu and the parameter P2.02.
ƒ Set this parameter based on the type of boiler as shown in the table
25C
30C
35C
40C
confirming the selection .
P2.02 (BOILER TYPE)
1
2
3
4
ƒ Select P2.03.
Value 1 = ZERO RESET: select this option when replacing the detection electrode on the
burner.
Value 2 =
RESTORE: select this option when replacing the electronic board.
b
If after maintenance work on the elements of the combustion unit (Repositioning
the detection electrode or else replacing/cleaning the primary heat exchanger,
condensate siphon, fan, burner, flue gases conveyor, gas valve, gas valve
diaphragm), the boiler generates one or more alarms regarding combustion faults,
we recommend setting the main system switch to off for at least 5 minutes.
5

MAINTENANCE AND CLEANING

Periodic maintenance is an "obligation" required by the law and is essential to the safety,
efficiency and duration of the boiler.
It allows for the reduction of consumption, polluting emissions and keeping the product
reliable over time.
Before starting maintenance operations:
- close the fuel and water taps of the heating and domestic hot water system.
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 the "1 WARNINGS AND SAFETY" chapter.
This normally means the following tasks:
- removing any oxidation from the burner
- removing any scale from the heat exchangers
- checking electrodes
- 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 couplings, gas and water and condensate connecting pipes
- checking the gas consumption at maximum and minimum output
- checking the position of the ignition electrode
- checking the position of the detector electrode/ionisation probe (see specific paragraph)
- checking the gas failure safety device.
b
After carrying out the maintenance operations the analysis of the combustion
products needs to be carried out to make sure it is operating correctly.
b
If, after replacing the electronic board or having carried out maintenance on the
detector electrode or the burner, the analysis of the combustion products returns
values outside tolerances, it might necessary to change these values as described
in the section "4.16 Combustion check".
Note: When replacing the electrode there could be slight variations of the
combustion parameters that fall within nominal values after a few hours of
operation.
b
Do not clean the appliance or its parts with inflammable substances (e.g. petrol,
alcohol, etc.).
b
Do not clean panels, painted parts and plastic parts with paint thinner.
b
Panel cleaning must be carried out only with soapy water.
Cleaning the primary heat exchanger (Fig. 21)
- Switch off the electrical supply by turning the system's main switch to "Off".
- Close the gas shut-off valve.
- Remove the casing as indicated in the paragraph "3.13 Removing the casing".
- Disconnect the connecting cables of the electrodes.
- Disconnect the power cables of the fan.
- Take out the clip (A) of the mixer.
- Loosen the nut of the gas train (B).
- Take out and turn the gas train.
- Remove the 4 nuts (C) that fix the combustion unit.
- Take out the air/gas conveyor assembly including the fan and mixer, being careful not to
damage the insulating panel and the electrodes.
- Remove the siphon connecting pipe from the condensate drain fitting of the heat
exchanger and connect a temporary collecting pipe. At this point proceed with the heat
exchanger cleaning operations.
- Vacuum out any dirt residues inside the heat exchanger, being careful NOT to damage
the retarder insulating panel.
- Clean the coils of the heat exchanger with a soft bristled brush.
b
DO NOT USE METAL BRUSHES THAT COULD DAMAGE THE COMPONENTS
- Clean the spaces between the coils using 0.4 mm thick blade, also available in a kit.
- Vacuum away any residues produced by the cleaning
- Rinse with water, being careful NOT to damage the retarder insulating panel
- Make sure the retarder insulation panel is undamaged and replace it if necessary
following the relative procedure.
ENGLISH
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