6720866940 (2017/11) US SSB
10 | Main components
4.8 Flue temperature sensor
The ue temperature sensor (Fig. 13) is located on the bottom of the heat
exchanger. It’s an immersion type NTC sensor rated at 10KΩ @ 77°F. It
prevents ue gas temperatures in excess of 100°C (212°F).
Fig. 13 Flue temperature sensor
4.9 Fan
The fan (Fig. 14) is located on the top of combustion chamber and
fastened to the burner head. The fan has an integrated PWM speed
control.
Fig. 14 Fan
4.10 Gas valve
The proportional gas valve (Fig. 15 - Fig. 16) is located above the fan and
it’s connected to the Venturi. The gas valve has 2 safety solenoid valves.
The gas valve regulates the air/fuel ratio on the basis of combustion air
delivery (the air/fuel ratio is 1:1).
Fig. 15 Gas valve SSB85 - SSB120
gas valve
Fig. 16 Gas valve SSB160
4.11 Venturi
The Venturi (Fig. 17 - Fig. 18) is integrated in the fan for all models. Its
function is to mix the air and fuel.
4
Fig. 17 Venturi SSB85 - SSB120
Component
[1] Fan
[2] Venturi
[3] Air inlet
[4] Gas inlet
Tab. 2 Venturi SSB85 - SSB120
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