How To Access To The Electric Box; User Terminal Block Connections; Connection Of System Add-Ons - Ferroli OMNIA ST 3.2 Handbuch Für Installation, Betrieb Und Wartung

OMNIA ST 3.2

7.6.2 How to access to the electric box

1. To dismount the front panel of the indoor unit:
• Partially unscrew the screws A (see "fig. 15 - front panel dismounting").
• Pull the panel B out and release it from the upper fixings (see "fig. 15 - front panel dismounting").
2. Make the connections referring to the functional electrical diagram present in this manual.
3. Proceed in reverse order to reassemble the front panel. Make sure that it is correctly attached to the upper fixing and completely resting on the side panels. The
head of the screw "A", once tightened, must not be underneath the lower bending stop (see "fig. 16 - upper screws mounting")..
fig. 15 - front panel dismounting
B
P
Q
E
A 1
B
E
1
A
fig. 17 - view without front panel
To access to the terminals of the indoor unit unscrew the two screws (part. 1 - fig. 17) under the electrical
box, then catch the electric box, and unlock (fig. 18), then rotate forward (fig. 19). Remove the back metal
sheet (part. 3 - fig. 19) that is fixed with 4 screws (part. 4 - fig. 19).
Legend:
A Display panel and keyboard (fig. 17)
B
Electronic hydronic board (fig. 20)
C Safaty thermal cut-out for single phase electrical heater with manual reset button (part. C1 fig. 20)
D Safaty thermal cut-out for three phase electrical heater with manual reset button (part. D1 fig. 20)

7.6.3 User terminal block connections

The terminal block (detail B fig. 17) is located on the left side of the boiler electric box. The terminal block
is a male-female connector strip. There is an identification label of the 6 terminals available on the side of
the terminal block.

7.6.4 Connection of system add-ons

The unit can manage system add-ons, such as an external circulation pump / zone 1 water pump, zone 2
water pump, 3-way mixer valve for zone 2, 3-way diverter valve for not/cold mode and smart grid. All these
elements are controlled by the hydronic board.
OK
fig. 18 - how to unlock the electric box
Cod. 3541V991 - Rev. 05 - 06/2022
NO
fig. 16 - upper screws mounting
4
fig. 19 - how to rotate the electric box
B
D1
D
fig. 20 - internal view of the electric box
ID
FUNCTION
TERMINAL
P
Q Serial Modbus
AND
A
B
Serial Modbus
AND
EN
3
C
C1
NOTES
For serial connec-
tion to the outdoor
unit
For connection
to the external
monitoring system
(BMS) or remote
control
99