Beretta MYNUTE X 25 C Instrucciones De Instalacion Y Uso página 6

MYNUTE X
CE4
- A B +
CE4 (- A B +) Bus 485
CE8 TBT Low temperature limit thermostat
TA Room thermostat (voltage free contact input)
OT+ Open therm
SE Outdoor temperature sensor
bianco white
nero black
ƒ carry out the electrical wiring connections using the desired connector as shown in the
detailed drawing
ƒ once the electrical wiring connections have been made, correctly insert the connector
into its counterpart.
b
We recommend using conductors with a section no larger than 0,5 mm
b
In the event of TA or TBT connection, remove the related jumpers on the terminal board.
b
If the low voltage electrical connection box is not connected the boiler does not ignite.
CE8
CE4
OTBus remote control connection
When an OTBus remote control is connected to the system, the boiler display shows the
following screen:
In particular on the boiler display:
ƒ it is no longer possible to set the boiler OFF/WINTER/SUMMER status (it is set by the
OTBus remote control)
ƒ it is no longer possible to set the domestic hot water setpoint (it is set by the OTBus
remote control)
ƒ the combination of the A+B keys remains active for the setting of the DOMESTIC HOT
WATER COMFORT function
ƒ the domestic hot water setpoint is displayed in the INFO menu
ƒ the heating setpoint set on the boiler display is used only if there are heat requests from
the TA and the OTBus remote control does not have a request if the parameter:
ƒ P3.11 = 1
or
ƒ P3.11 = 0 and the jumper on 1-2pin of X 21 is closed.
ƒ to activate the COMBUSTION CHECK function with an OTBus remote control connected,
you must temporarily disable the connection by setting the parameter P8.03 = 0. Remember
to reset this parameter once the function has finished.
We can see that it is not possible, with the OTBus remote control connected, to change the
values of the parameter P4.12 and P4.23 from 0 to 1.
Note: an OTBus remote control cannot be connected if the system already has BE16
interface boards. For the same reason it is not possible to connect BE16 boards if
there is already an OTBus device.
In this case the system gives the following error message: <<OTER>>.
High voltage connections
The connection to the mains supply must be made via a separation device with an omnipolar
opening of at least 3.5 mm (EN 60335/1 - category 3). The appliance works with alternating
current at 230 Volt/50 Hz, and is in compliance with Standard EN 60335-1. It is obligatory to
make the connection with a safe ground/earth, in compliance with current directives.
6
CE8
TBT TA OT+ SE
Utilizzare contatto privo di tensione
voltage free contact input
.
2
b
The installer is responsible for ensuring the appliance is suitably earthed; the
manufacturer will not be liable for any damage resulting from an incorrect or absent
earth connection.
b
It is also advisable to respect the phase-neutral connection (L-N).
b
The earth conductor must be a couple of cm longer than the others.
b
To create the seal of the boiler use a clamp and tighten it on the cable grommet
used.
The boiler can operate with a phase-neutral or phase-phase (not floating) power supply.
It is forbidden to use gas and/or water pipes to earth electrical appliances.
Use the power cable supplied to connect the boiler to the mains power supply. If the power
cable has to be replaced, use a HAR H05V2V2-F, 3 x 0.75mm² cable, Ø max external 7 mm.
3.10 Gas connection
The connection of the gas supply must be carried out in compliance with current installation
standards. Before carrying out the connection, check that the type of gas is that for which
the appliance is set up.
3.11 Variable speed circulator
The modulating circulator function is active only in the heating function. In the switching of
the three-way on the domestic hot water, the circulator always operates at maximum speed.
The modulating circulator function applies only to the boiler circulator and not to circulators
of any external devices that are connected (e.g. relaunch circulator). There are 4 management
modes to choose from depending on the situations and the type of system.
Entering the P4 menu, parameter P4.05, it is possible to choose from:
1 - VARIABLE SPEED CIRCULATOR WITH PROPORTIONAL MODE (41 <= P4.05 <= 100)
2 - VARIABLE SPEED CIRCULATOR WITH CONSTANT ∆T MODE (2 <= P4.05 <= 40)
3 - CIRCULATOR IN FIXED MAXIMUM SPEED MODE (P4.05 = 1)
4 - EXCEPTIONAL USE OF A STANDARD CIRCULATOR WHOSE SPEED CANNOT BE
REGULATED (P4.05 = 0)
1 - VARIABLE SPEED CIRCULATOR WITH PROPORTIONAL MODE (41 <= P4.05 <= 100)
In this mode the boiler board determines which flow curve to be adopted for the instantaneous
output of the boiler .
2 - VARIABLE SPEED CIRCULATOR WITH CONSTANT ∆T MODE (2 <= P4.05 <= 40)
In this mode the installer sets the ∆T value to be kept between delivery and return (e.g.: entering
a value= 10 la the speed of the circulator will change to have a system flow rate with the aim of
keeping the ∆T upstream and downstream heat exchanger of 10°C).
3 - VARIABLE SPEED CIRCULATOR WITH FIXED MAXIMUM SPEED MODE (P4.05 = 1)
In this mode the circulator, when activated, always operates at maximum speed. Used in high
pressure drop systems where it is necessary to fully exploit the boiler discharge head in order to
provide sufficient circulation (system flow at maximum speed lower than 600 litres/hour). Used
when there are bottles of mixture with high flow rate in the downstream circuit. Operationally:
ƒ Enter parameter P4.05
ƒ Set the value = 1
4 - EXCEPTIONAL USE OF A STANDARD CIRCULATOR WHOSE SPEED CANNOT BE
REGULATED (P4.05 = 0)
This mode should be used in exceptional cases where you want use a traditional UPS circulator
in the boiler.
CONFIGURATIONS RECOMMENDED BY THE MANUFACTURER
OUTDOOR TEMPERATURE
SENSOR
(YES THERMOREGULATION)
LOW
ΔT constant
TEMPERATURE
(5 ≤ P4.05 ≤ 7)
(floor)
HIGH
TEMPERATURE ΔT constant
(radiators without (15 ≤ P4.05 ≤ 20)
thermostatic valves)
HIGH
TEMPERATURE ΔT constant
(radiators with (15 ≤ P4.05 ≤ 20)
thermostatic valves)
3.12 Manual reset of the circulator
The circulator has an electronic reset function, however if a manual reset is necessary, proceed
as follows:
- use a Phillips screwdriver, preferably Phillips no. 2
- insert the screwdriver in the hole until it comes into contact with the reset screw, then press
(basically the screw should go in by about 2 mm) and turn anti-clockwise.
OUTDOOR TEMPERATURE
SENSOR
(NO THERMOREGULATION)
PROPORTIONAL
(P4.05 = 85)
PROPORTIONAL
(P4.05 = 85)
PROPORTIONAL
(P4.05 = 60)