2.7 Safety devices
1 BOILER OFF
(switches off the boiler to prevent overheating)
❒ Tap “Boiler off”
➥ Automatic mode is switched off
➥ Control system follows the boiler shutdown procedure
➥ Pumps continue to run
2 MAIN SWITCH
(switches off the power supply)
Before carrying out work on/in the boiler:
❒ Tap “Boiler off”
➥ Automatic mode is switched off
➥ Control system follows the boiler shutdown procedure
❒ Switch off the main switch and let the boiler cool down
3 SAFETY TEMPERATURE LIMITER (STL)
(protection against overheating)
The STL (high-limit thermostat) switches off the combustion system when the boiler
reaches 100°C. The pumps continue to run. Once the temperature falls below approx.
75°C, the STL can be reset mechanically.
On site:
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.
For T4e 130-350:
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
Safety
2
Safety devices
Operating Instructions T4e | B1560520_en 15
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