2.8
MODBUS mode
(fig. 10 - fig. 10/a)
This mode enables boiler MODBUS commu-
nication and can be achieved by requesting
the RS-485 board supplied with the kit,
code 8092244.
To install the board, proceed as follows:
- Install the RS-485 board in the relevant
seat on the control panel and connect it
electrically to the boiler board with the
wired connector provided in the kit.
ATTENTION: Insert the wired connector
with caution.
- Set the DIP SWITCH of the board in MOD-
BUS mode.
- Choose the communication configuration
suited to the MODBUS network (PAR 17
INST) according to
Table PAR 17 INST
.
2.8.1
Anti-freeze function
The boilers are equipped with anti-freeze
function which activates the pumps and the
burner when the temperature of the water
contained inside the appliance drops to
below 6°C.
The anti-freeze function is ensured, howe-
ver, only if:
- the boiler is correctly connected to the
gas and electricity supply circuits;
- the boiler is constantly fed;
- the boiler ignition is not blocked;
- the essential components of the boiler
are all in working order.
In these conditions the boiler is protected
against frost down to an environmental
temperature of -5°C.
ATTENTION: In the case of installation in a
place where the temperature drops below
0°C, the connection pipes must be pro-
tected.
84
R
M
SE
CT2
TA1
SE
CT1
SI
RL2
P2
P1
TA2
RL1
ZONA
GIORNO
(70
°
C)
ZONA
NOTTE
(50
°
C)
8
SYSTEM WITH DOUBLE TEMPERATURE OUTPUT
MULTI-ZONE SYSTEM WITH PUMP AND CHRONOTHERMOSTAT
DAY
ZONE
(70°C)
NIGHT
ZONE
(50°C)
x 2
Fig. 10
