Boiler Type; Maintenance And Cleaning - Beretta MYNUTE X C Installer And User Manual

In this case, the anti-freeze and anti-blocking systems are deactivated. Drain the heating
and domestic water system if there is any risk of freezing.
Closing
position
4.24 Keyboard lockout function
Pressing buttons 1+3 for at least 2sec activates the key lockout; pressing buttons 1+3 again
for at least 2sec re-activates the key. The display will show <<KEY LOCKED>>.
+
Key 2 can stay active if there is a fault to allow the alarm to be reset.
4.25 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:
4.26 Replacing SC08 interface
The system configuration operations need to be carried out by professionally qualified
personnel of the Technical Assistance Centre.
When replacing the SC08 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 "4.6 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.
4.27 Replacing the AKM board
When replacing the AKM adjustment and control board it might be necessary to re-
programme the configuration parameters. In this case see the SETTINGS MENU 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:
GAS TYPE

BOILER TYPE

HYDRAULIC CONFIGURATION
WATER TRANSDUCER
AUTO WATER FILL ENABLE
SLIDING OUTLET TANK FLOW TEMP
+
RESET MENU
1 3
4.28 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 "3.20 Access to the
parameters" entering the INSTALLER password.
ƒ Select COMB with the keys
ƒ Select GAS TYPE.
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 COMB menu and the parameter BOILER TYPE
ƒ Set this parameter based on the type of boiler as shown in the table
25C
30C
35C
40C
ƒ Select COMBUSTION OFFSET.
select this option when replacing the detection electrode on the
Value 1 = ZERO RESET:
burner.
Value 2 = select this option when replacing the AKM electronic board.
RESTORE:
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 "4.17 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.
and confirming the selection
BOILER TYPE
1
2
3
4
ENGLISH
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