2.8 Safety devices
Underneath the back insulating cover:
11 HIGH-LIMIT THERMOSTAT (STL)
(protection against overheating)
The STL switches off the combustion system when the boiler reaches 105°C. The
pumps continue to run. Once the temperature falls below approx. 75°C, the STL can
be reset mechanically.
12 MAIN SWITCH
(switches off the power supply)
For shutting down the entire system
❒ The power to all components is switched off.
➥ WARNING! Only switch off the boiler when the fuel has burnt down and the
boiler has cooled off.
TA THERMAL DISCHARGE VALVE
(protection against overheating)
The thermal discharge valve opens at approx. 100°C and feeds cold water to the
safety heat exchanger to lower the boiler temperature
SV SAFETY VALVE
(protection against overheating/excess pressure)
When the boiler pressure reaches a maximum of 3 bar, the safety valve opens and the
heated water is blown off in the form of steam.
2
Safety
Safety devices
18 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com
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