31
SETTING FUNCTIONING PARAMETERS
Mix delivery temperature (°C)
20
30
40 50 60
Valve closing-opening (s)
-4
-3
-2
-1
0
1
25
35
45 55
2
Open
Close
default Par. 31 = 10
Fig. 34
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 ue 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 ow switch as
well as checking the difference between the delivery and return
temperatures.
Checking ∆T uses the parameter ∆T_max (preset to 35°C) and lim-
its the burner power as follows:
− if ∆T_max -5°C > ∆T > ∆T_max –10°C = burner modulated
− 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.
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