2.5 Safety devices
TA
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
➥ The pumps continue to run
NOTICE! Never use the main switch!
2
MAIN SWITCH
(switches off the power supply)
Before carrying out work on 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 OVERLOAD SWITCHES, MOTOR PROTECTION SWITCHES, RESIDUAL
CURRENT PROTECTIVE DEVICES (RCD)
Switch off the related component in the event of fault currents or overloads.
4
SAFETY TEMPERATURE LIMITER (STL)
(protection against overheating)
The STL switches off the combustion system when the boiler reaches 95 - 100°C. The
pumps continue to run. Once the temperature falls below approx. 75°C, the STL can
be reset mechanically.
5
DOOR CONTACT SWITCH
When the door is opened, the induced draught is kept at a constant speed.
Safety
2
Safety devices
Operating Instructions TI 350 | B1380220_en
17
