Beretta Mynute J 24 C.A.I. E, Installer And User Manual

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MYNUTE J C.A.I. E
5
5a) to the area divided in segments.
Adjustment of domestic hot water temperature
To adjust domestic water temperature (bathrooms, showers, kitchen, etc.), turn
the knob with symbol “ ” (fig. 6a): to one of the numerical values within 1 (min
value 37 °C) and 9 (max. value 60 °C).
On the control panel, the green led (1 - fig. 1a) flashes with frequency 0.5 second
on, 3, 5 seconds off.
The boiler is standby status until, after a heat request, the burner switches on
and the indicator turns fixed green to indicate flame presence.
The boiler will be in function until the adjusted temperature is reached, afterwards
it will be in “standby” again. If the red indicator light near the " " symbol on
the command panel lights up, this means the boiler is in temporary stop status
(see the chapter about light signals and faults). The digital monitor indicates the
fault code detected (fig. 8a).
4.3 Switching off
Temporary switching off
In case of absence for short periods of time, set the mode selector (2 - fig. 1a)
to (OFF).
Anti-frost device remains active.
Long period switching off
In case of absence for long periods of time, set the mode selector (2 - fig. 1a)
to (OFF).
Then, close the gas tap present on the system. In this case, anti-frost device is
deactivated: empty the systems, in case of risk of frost.
4.4 Light signals and faults
The control panel has two led that indicate the boiler operating status:
Green led
Flashing
- Flashing with frequency 0.5 second on - 3.5 seconds off = boiler in standby,
there is no flame.
- Flashing with frequency 0.5 second on - 0.5 second off = temporary stop of
the appliance due to the following self-restoring faults:
- water pressure switch (standby time 10 minutes approximately)
- transitory waiting for ignition.
In this phase, the boiler waits for restoration of working conditions. If after standby
time, the boiler will not restore regular operation, stop will be permanent and
light signalling will be red.
- Fast flashing (frequency 0.1 sec. on; 0.1 sec. off; duration 0.5) S.A.R.A.
input/output function (Italian acronym for Environment Automatic Adjustment
System) - Fig. 10a.
By setting the heating water temperature selector to the area marked by AUTO - tem -
perature value from 55 to 65°C - the S.A.R.A. self-adjusting system is activated: the
boiler varies the delivery temperature according to the closing signal of the ambient
thermostat. When the temperature set with the heating water temperature selector is
reached, a 20 minutes count begins. If during this period the ambient thermostat still
requests heat, the value of the set temperature automatically increases by 5 °C.
When the new value is reached, other 20 minutes count begins.
If during this period the ambient thermostat still requests heat, the value of
the set temperature automatically increases by 5 °C.
This new temperature value is the result of the temperature set manually
with the heating water temperature selector and the increase of +10 °C of
the S.A.R.A function
After the second increasing cycle, the temperature value is restored to the
value set by the user and the above mentioned cycle is repeated until the
ambient thermostat request is fulfilled.
Fixed green
If there is a flame, the boiler works regularly.
Red led
If the red LED lights up, this indicates the presence of a fault; the monitor visu -
alises a code interpreted as follows:
A 01 flame failure (fixed red LED + flame failure icon “ ”)
A 02 limit thermostat intervention (blinking red LED)
A 03 limit thermostat intervention (fixed red LED)
A 04
water pressure switch after the transitory phase (fixed red LED + filling
icon “ ”)
A 06
domestic hot water NTC probe (blinking green + red LEDs)
A 07
heating NTC probe (fixed red LED)
To restore operation: faults A 01-02-03
Position the function selector on OFF, wait 5-6 seconds then rotate it to the
required position (summer) or (winter). If the reset attempts do not
reactivate the boiler, contact the Technical Assistance Centre.
Fault A 04
Along with the fault code, the digital monitor visualises the symbol. Check the pres -
sure value indicated by the hydrometer: if it is less than 0.3 bar, position the function
selector on (OFF) and adjust the filling tap until the pressure reaches a value be -
tween 1 and 1.5 bar. Position the function selector on the required position (summer)
or (winter). If these pressure drops occur frequently, contact the Techni -
cal Assistance Centre.
Fault A 06
The boiler functions normally but does not guarantee a constant domestic hot
water temperature, which remains set at around 50°C.
Fault A 07
Contact the Technical Assistance Centre.
Fixed yellow LED
Pre-heating function activated.
When the LEDs flash alternatively it means that there is a calibration procedure
in progress.
4.5 Adjustments
The boiler has already been adjusted by the manufacturer.
If it is necessary to adjust it again, for example after extraordinary maintenance,
after replacement of gas valve or after gas conversion, carry out the following
procedure.
The maximum output adjustment must be carried out in the sequence
indicated exclusively by qualified personnel.
- remove the shell unscrewing the fixing screws A (fig. 15)
- unscrew by two turns the screw of the pressure test point downstream the
gas valve and connecting the pressure gauge
4.5.1 Maximum power and minimum domestic hot water
adjustment
- fully open the hot water tap
- on the control panel:
- set the mode selector to (summer) (fig. 16)
- turn the domestic hot water temperature selector to its maximum (fig. 17)
- power the boiler setting the system main switch to “on”
- check that the pressure on the pressure gauge is stable; or with a milliam -
meter in series to the modulator, make sure that the modulator supplies the
maximum available current (120 mA for G20 and 165 mA for LPG).
- carefully prise out the protection cap of the adjustment screws, using a screw -
driver (fig. 18)
- with a fork spanner CH10 use the adjustment nut of the maximum output in
order to obtain the value indicated in table on page 8.
- disconnect the modulator faston
- wait until the pressure on the pressure gauge is stable at minimum value
- paying attention not to press the internal shaft, use a Phillips screwdriver to
turn the red adjustment screw for domestic hot water minimum temperature
regulation, calibrating it until the pressure gauge reads the value indicated in
the table on page 8.
- reconnect the modulator faston
- close the domestic hot water tap
- carefully refit the protection cap of the adjustment screws.
4.5.2 Minimum and maximum heating electric adjustment
The “electric adjustment” function is activated and deactivated exclusively
by the jumper (JP1) (fig. 19).
The green and red LEDs on the command panel blink alternately.
The function can be enabled in the following way:
-
by powering the card with the jumper JP1 inserted and the mode selector in
winter position, independently from the possible presence of other operation
request.
-
by inserting the jumper JP1, with the mode selector in winter position, without
heat request in progress.
By activating the function the burner is ignited through simulation of heat
request in heating.
To perform calibration operations, proceed as follow:
- switch off the boiler
- remove the shell and access the card
- insert the jumper JP1 (fig. 19) to enable the knobs placed on the control panel
to the minimum and maximum heating adjustment functions.
- make sure that the mode selector is in winter position (see section 4.2).
- power the boiler
Electric card in voltage (230 Volt)
- turn the heating water temperature adjustment knob B (fig. 20) until it reaches
the heating minimum value as indicated in the multigas table on page 8
- insert the jumper JP2 (fig. 19)
- turn the domestic hot water temperature adjustment knob C (fig. 20) until it
reaches the heating maximum value as indicated in the multigas table on
page 8
- remove the jumper JP2 to store the maximum heating value
- remove the jumper JP1 to store the heating minimum value and to get
out the calibration procedure
Disconnect the pressure gauge and retighten the pressure test point screw.
T o finish the calibration function without storing the set values, proceed
as follows:
a) set the mode selector to position (OFF)
b) remove power supply voltage
c) remove JP1/JP2
The calibration function is automatically finished, without storing minimum
and maximum values, after 15 minutes of its activation.
The function is automatically finished also in case of definitive stop or
lockout.