Safety Devices - Froling SP Dual compact Operating Instructions Manual

2 | Safety

2.7 Safety Devices

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TA
SV
1 PELLET UNIT OFF (switches off pellet unit when overheating)
r Tap "Pellet unit OFF"
Ä Automatic mode is switched off
Ä Control follows the boiler shutdown procedure
Ä The pumps continue to run
2 MAIN SWITCH (switches off the power supply)
Before carrying out work on/in the boiler:
r Press the standby key
Ä Automatic mode is switched off
Ä Control system follows the boiler shutdown procedure
r Switch off the main switch and let the boiler cool down
3 SAFETY TEMPERATURE LIMITER (STL) (protection against overheating)
The STL switches off the combustion system at a maximum boiler temperature of 105 °C.
The pumps continue to run. Once the temperature falls below approx. 75°C, the STL can
be reset mechanically.
TV 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.
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B1500423_en | Operating instructions Dual fuel boiler SP Dual compact
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