Hoval BIC 960 - 10 NTC Protection

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NTC PROTECTION
X9 6- pin Molex-Minit (White) Series 5566
-1 24V DC
-2 Gas pressure switch
-3 Air pressure switch
-4 Blocking input
-5 Reset
-6 Security thermostat
X10 4- pin Molex Minit (Blue) Series 5566
-1 I2C
-2 I2C
-3 I2C, earth
-4 Not occupied
X11 4- pin Molex Minit (White) Series 5566
-1 RS232, RX
-2 RS232, TX
-3 RS232, 5V DC
-4 RS232, earth
X12 10- pin (SIT-interface for gas-mixture control)
Transformer (Tr1)
HS- Ignition/Ionisation
10. NTC Protection
Cause Limits Reaction
Boiler sensor 1 / Boiler sensor 2:
Sensor short circuit 125 °C Lock-out
Sensor not connected -25 °C Lock-out
Lock-out temperature 110 °C Lock-out
Maximum temperature difference between sensor 1 and sensor 2 10 °C Lock-out
Blocking temperature
Value dependent on
boiler type
Blocking
Maximum temperature rise with low ow temperature
1)
1 °C/sec Min. capacity
Maximum temperature rise with high ow temperature
2)
0.5 °C/sec Min. capacity
1)
‟Low” ow temperature 60 °C
2)
‟High” ow temperature 80 °C
Flue gas sensor (only available from UltraGas
®
):
Flue gas sensor short-circuit 125 °C Lock-out
Flue gas sensor interruption -25 °C Lock-out
Flue gas temperature lock-out 110 °C Lock-out
Flue gas temperature blocking 100 °C Blocking