2 | Safety
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B1510622_en | Operating instructions Firewood boiler S4 Turbo
2.7 Safety devices
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13
TA
SV
Underneath the back insulating cover (9):
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MAIN SWITCH
(switches off the power supply)
For shutting down the entire system
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The power to all components is switched off.
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WARNING!
Only switch off the boiler when it has burnt down and cooled off.
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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.
TA
THERMAL DISCHARGE VALVE
(protection against overheating)
The thermal discharge valve opens a valve at approx. 100°C and feeds cold water to the
safety heat exchanger to lower the boiler temperature
SV
SAFETY VALVE
(protection against overheating/excessive 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.