Work Algorithm - Tech Controllers ST-976 User Manual

CH boiler hysteresis
This option is used to set the hysteresis of the pre‐set temperature. It is the difference between the
temperature of entering the sustain mode and the temperature of restoring operation mode.
Example:
When the pre‐set temperature is 60 ºC, the hysteresis is 3ºC, the device will be disabled at the
temperature of 60 ºC whereas returning to the operation mode takes place at 57 ºC.
DHW hysteresis
This option is used to set the hysteresis of the pre‐set water tank temperature. It is the difference between
the pre‐set temperature (desired temperature of the water tank) and the temperature of returning to
operation mode.
Example:
When the pre‐set temperature is 55 ºC, the hysteresis is 5ºC, the device is disabled when the pre‐set
temperature of 55 ºC is reached. It is activated again when the temperature drops to 50 ºC.
Pump switch on temperature
This option is used to define the temperature of CH pump and DHW pump activation (temperature measured
on the CH boiler). Below this temperature value both pumps remain inactive whereas above this value the
pumps are enabled and operate according to the operation mode.
4.3.4
Work algorithm
Standard operation
 Decide if you want to adjust standard operation parameters for Maximum power or Minimum power
 Tap on the icon of the parameter to be edited and define the parameter values using a slider or arrows.
This option enables the user to configure operation time, frequency of feeder activation and blow force for a
given power level.
If the controller cooperates with Lambda sensor, the user may also configure the pre‐set amount of oxygen in
flue gas for each power level. Then, the feeder and fan operation will also be controlled on the basis of Lambda
sensor readings.
14
Pre‐set CH temperature
Hysteresis
Entering sustain mode
Return to operation mode
Pre‐set DHW temperature
Hysteresis
Pump deactivation
Pump activation
60°C
3°C
60°C
57°C
55°C
5°C
55°C
50°C
Minimum power
Maximum power