Fuel Level Calibration - Tech Controllers ST-976 User Manual

TECH RS regulator
Select this option if you connect a room regulator with RS communication. Such a regulator enables the user
to view current CH boiler parameters and change certain settings e.g. pre‐set CH boiler temperature, pre‐set
DHW temperature.
Standard regulator
Select this option if you connect a two‐state regulator. Such a regulator sends a signal to the main controller
informing if the pre‐set room temperature has been reached or not.
CH pump room regulator
When this option is selected, the signal from room regulator informing that the pre‐set room temperature has
been reached disables the CH pump.
Room reg. temp. lower
NOTE
This parameter concerns RS regulator ‐ decrease function and Standard regulator and TECH regulator
with RS communication.
The user sets the value of pre‐set valve temperature reduction which will be introduced when the pre‐set room
temperature is reached.
The temperature reduction will not be lower than the minimum pre‐set CH temperature.
Example:
Pre‐set CH boiler temperature
Room reg. temp. lower
Minimum pre‐set CH boiler temperature
Pre‐set CH boiler temperature after the pre‐set temperature
value has been reached
Once the pre‐set room temperature has been reached in the building (signalised by the room
regulator), the pre‐set temperature at the CH boiler will be reduced to 45°C (10°C difference) although
the value of Room reg. temp. lower parameter is 15°C.
4.4.10
Fuel level calibration
Conducting fuel level calibration properly enables the user to view the current level of fuel on the controller
screen.
 The first step involves filling the fuel tank up
 Next, select the option Fuel tank full. The controller remembers the level as full (100%).
 When there is no fuel left in the tank (after a period of CH boiler operation), select the option Fuel
tank empty.
38
55°C
15°C
45°C
45°C
Fuel tank full
Fuel tank empty