43
Safety functions of the Slave cards
If the delivery temperature > 90°C for 5s, the slave card is
blocked (no. 46).
If the return temperature > 80°C for 5s, the slave card is
blocked (no. 47).
If the flue gas temperature > 80°C for 5s, the slave card
is blocked (no. 48) and the fan operates for 10 minutes at
maximum.
The Slave card is able to protect the primary exchanger
from the hazards of low water circulation both using a flow
switch as well as checking the difference between the de-
livery and return temperatures.
Checking
∆
T uses the parameter
∆
T_max (preset to 35°C)
and limits the burner power as follows:
- if
∆
T_max -5°C >
∆
T >
∆
T_max –10°C = burner mod-
ulated
- if
∆
T_max >
∆
T >
∆
T_max –5°C = burner at minimum
- if
∆
_T >
∆
_T_max = burner off.
Furthermore, the presence of a sensor stops the exchanger
if the pressure inside the combustion unit goes below 0.5
bar.
3 7 Setting addresses for cascade coupling
If it is necessary to implement multiple modular systems with a cascading connection, the second modular system on-
wards must be disconnected from the Slave cards so that all Slave cards are managed only by the master card of the
first modular system.
Master
Slave
Slave
Slave
Master
Slave
Slave
Slave
Master
Slave
Slave
Slave
PRIMO Sistema Modulare
J14
J14
SECONDO Sistema Modulare
TERZO Sistema Modulare
For the modular systems of the second onwards:
1
Access to the MASTER card and disconnection of the
Slave cards
- access the Master card
- identify the connector at terminal J14 and disconnect
it
BUS J14
2
BUS J14
1
4 3
J2
MC
MASTER
card
2
Access to the SLAVE cards and setting the addresses
- every Slave card (3 or 4 per installed generator) must
be configured correctly to be recognised in the cor-
rect sequence by the Master card.
J17
J10
Mai
SLAVE card
SLAVE address
DO NOT CHANGE
BLOCK address
TO BE SET
n
ON
OFF
1
2
123
4
OFF
ON