Gas Connection - Beretta MYNUTE X R Installer And User Manual

MYNUTE X R
CN8
CN4
TBoll or Sboll connection
To connect water tank thermostat and water tank probe access the boiler board as follows:
ƒ Remove the casing as described in the paragraph "3.12 Removing the casing".
ƒ Gently lift and turn the control panel to free it from the side hooks.
ƒ Remove the 2 fixing screws of the electric parts opening cover.
ƒ Connect TBOLL and SBOLL to M4a as shown in the figure.
T.BOLL. S.BOLL.
M4a
10
b
In case of boiler+external water tank configuration with probe (C CASE) add a jum-
per on the TBOLL input of M4 terminal board.
OTBus remote control connection
When an OTBus remote control is connected to the system, the boiler display shows the
following screen:
6
-t°
T.P.
3
1
MOD
1
X19
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 it is not possible to activate the COMBUSTION CONTROL function if the boiler is con-
nected to a remote OTBus.
In addition:
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
DO_AUX1 = 1 or DO_AUX1 = 0 and the jumper on 1-2pin of X21 is closed.
We can see that it is not possible, with the OTBus remote control connected, to change the
values of the parameter MAIN ZONE ACTUATION TYPE and ZONE1 ENABLE to 1.
Note: an OT+ 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 OT+ device.
In this case the system
<<OT+ CONFIGURATION ERROR>>.
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.
b
The installer is responsible for ensuring the appliance is suitably earthed; the ma-
nufacturer 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.
3.9

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.
3.10 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 manage-
ment modes to choose from depending on the situations and the type of system.
Entering the CH menu, parameter PUMP CONTROL TYPE, it is possible to choose from:
1 - VARIABLE SPEED CIRCULATOR WITH PROPORTIONAL MODE (41 ≤ PUMP CON-
TROL TYPE ≤ 100)
2 - VARIABLE SPEED CIRCULATOR WITH CONSTANT ΔT MODE (2 ≤ PUMP CON-
TROL TYPE ≤ 40)
3 - CIRCULATOR IN FIXED MAXIMUM SPEED MODE (PUMP CONTROL TYPE = 1)
4 - EXCEPTIONAL USE OF A STANDARD CIRCULATOR WHOSE SPEED CANNOT BE
REGULATED (PUMP CONTROL TYPE = 0)
1 - VARIABLE SPEED CIRCULATOR WITH PROPORTIONAL MODE (41 ≤ PUMP
CONTROL TYPE ≤ 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 ΔT MODE (2 ≤ PUMP
CONTROL TYPE ≤ 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 - CIRCULATOR IN FIXED MAXIMUM SPEED MODE (PUMP CONTROL TYPE = 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 downstre-
am circuit. Operationally:
ƒ enter parameter PUMP CONTROL TYPE
ƒ set the value = 1
gives the following error message: