Iii.b) Thermal Protection; Iii.c) Automatic Sensor Check - TECH ST-37 Manual Manual

ST-37 – Instruction Manual
III.a) Temperature Alarm
The protection is enabled only in the operation mode (i.e. when the furnace
temperature is lower than the setpoint temperature). When the furnace
temperature fails to rise in the user-defined period, an alarm is activated: the
feeder and the fan are shut off (the water pump is activated regardless of the
furnace temperature) and the alarm is sounded. The display shows an
appropriate message:
If you press OPTIONS, the regulator will deactivate the alarm. The regulator
will return to the previous working mode.

III.b) Thermal Protection

The boiler is protected with an additional bimetal sensor (located at the
furnace sensor) that deactivates fan and feeder inputs when the temperature
exceeds the critical value of 85°C. This is to prevent water from boiling in the
system when the boiler has been overheated or the regulator damaged. With
this type of safety temperature protection, the system will return to the initial
position (automatically).

III.c) Automatic Sensor Check

When the temperature sensor of the central heating, hot consumption water,
screw or grate is damaged, an alarm is activated with an additional indication
shown in the display, e.g.:
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A L A R M
Temp does not rise
A L A R M
Sensor damaged