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7.9.1 Opening the front panel
1. To dismount the front panel of the indoor unit:
Partially unscrew the screws A (see "fig. 27 - removing the front panel").
Pull the panel B out and release it from the upper fixings (see "fig. 27 - removing
the front panel").
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 cor-
rectly attached to the upper fixing and completely resting on the side panels. The
head of the screw "A", once tightened, must be positioned as indicated in "fig. 28
- assembly with bottom screws").
fig. 27 - removing the front panel
OK
fig. 28 - assembly with bottom screws
7.9.2 User terminal block connections
The terminal block (detail 4b "fig. 29 - User terminal block") 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 11 terminals available on the side of the
terminal block.
4b
R
R
P
Q
E
A
B
E
H
L1
C
fig. 29 - User terminal block
42
EN
ID
TERMINAL
R
R
P
Q
AND
A
B
AND
H
L1
C
H-L1-C - Digital inputs for room thermostat
If the digital inputs H-L1-C are enabled by parameter 6.1 and parameter 5.3
(see "9.3.2 Heat pump service menu" on page 60), they have priority over
ON/OFF settings and mode change (only for Method A) from user interface.
Digital inputs not enabled (default)
Set par. 6.1 = 0
Digital inputs enabled
•
Method A - operating mode setting
The request can occur, for example, via 2 Heat and Cool operating status switches:
Set par. 6.1 = 1 (mode set).
H-L1 (Heat)
NO
Closed
Open
Closed
Open
•
Method B - Operating request on system
The request may come, for example, from a room thermostat. The system will
operate in the mode set by the user interface.
Set par. 6.1 = 2 (one zone)
Operating status:
H-L1
Closed
Open
Cod. 3542B230 - Rev. 00 - 02/2022
OMNIA S HYBRID H 3.2
FUNCTION
For factory testing
For factory testing
Serial Modbus
For connection to the external
Serial Modbus
For connection to room
thermostats
L1-C (Cool)
Operating status
Open
System heating mode
Closed
System cooling mode
Closed
System cooling mode
Open
Off on system
HEAT (H)
COOL (C)
fig. 30 - Method A thermostat (for mode change)
L1-C
Operating status
Not used
Used by the system
Not used
Off on system
TZ
fig. 31 - Method B thermostat ( 1 zone)
NOTES
Reserved
Reserved
For serial connection to the
outdoor unit
monitoring system (BMS) or
remote control
For details, see the following
paragraph "H-L1-C - Digital
inputs for room thermostat"
OT
OT
A
B
E
P
Q
E
H
L1
C
OT
OT
A
B
E
P
Q
E
H
L1
C
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