Beretta MYNUTE X R Installer And User Manual page 6

MYNUTE X R
3.8 Positioning the wall-mounted boiler and hydraulic
connections (Fig. 10)
The boiler comes as standard with a boiler support plate. The position and dimension of
hydraulic fittings are shown in the detail drawing.For the assembly, proceed as follows:
- fasten the boiler support plate (F) to the wall and use a spirit level to make sure it is
perfectly horizontal
- mark the 4 holes (ø 6 mm) envisaged for securing the boiler support plate (F)
- make sure that all measurements are exact, then drill the wall using drill tips with the
diameters indicated above
- fix the plate with the built-in template (G) to the wall.
- fix the safety valve pipe supplied in the documentation envelope onto the coupling of the
safety valve (S), then connect it to an adequate discharge system.
Make the hydraulic connections:
M heating delivery
MB water tank delivery
G
gas
RB water tank return
R heating return line
S safety valve
3.9 Electrical connections
Low voltage connections
Make the low voltage connections as follows:
ƒ use connectors supplied as standard:
ƒ 4-poles ModBus connector for BUS 485 (- A B +)
ƒ 8-poles connector for TBT - TA -OT+ - SE
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
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 "3.13 Removing the casing".
ƒ Gently lift and turn the control panel to free it from the side hooks.
6
3/4" M
3/4" M
3/4" M
3/4" M
3/4" M
1/2" M
CE8
TBT TA OT+ SE
Utilizzare contatto privo di tensione
voltage free contact input
ƒ Remove the 2 fixing screws of the electric parts opening cover.
ƒ Connect TBOLL and SBOLL to M4a as shown in the figure.
.
2
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:
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 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.
T.BOLL. S.BOLL.
-t°
M4a
10
X19
T.P.
3
1
MOD
1