Supplied By www.heating spares.co Tel. 0161 620 6677
29
DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Safety thermostat
X5 - 1/2 has a thermostat with gold contacts that opens if the temperature
exceeds 100°C. Connected directly to the main card, when it opens it cuts off
the power supply to the valve directly, shutting down the boiler. It is set on the
left-hand side of the exchanger by a spring.
Heating and tap water temperature probe
These are NTC sensors that increase their resistance as the temperature
decreases and are connected directly to the main card X4 - 24V (heating 12-13,
tap water 10-11). The heating sensor performs the antifreeze function too.
NTC sensor
0
3
6
9
12
15
18
21
24
27
30
33
0
20
40
60
80
100
120
Temperature ( C° )
Resistance ( k Ohm )
15
50
70
30
90
5
25
40
60
80
100
Temperature ( C° )
Resistance ( k Ohm )
3,6
1,7
8
0,92
10
5,3
2,5
1,25
0,68
15,6
25,3
