ST-979 user’s manual
7
V.b) Fire-up
Once this option is selected, the fire-up process is initiated. The following stages of this process
are described in part IV.b.
V.c) Fuel tank full
This function should be used after the fuel tank has been fully filled, in order to reset the fuel
consumption percentage to 100%.
NOTE: Before using this function for the first time it is necessary to calibrate the fuel feeder
operation in the Fitter’s menu/ Calibration.
V.d) Temperature settings
Tap on Temperature settings icon to adjust the pre-set temperature and the hysteresis for both
the CH boiler and DHW tank.
V.d.1) Pre-set CH temperature
This option is used to define the pre-set temperature of the CH boiler. The setting range available
is 45
O
C to 80
O
C.
V.d.2) CH boiler hysteresis
This option is used to set the hysteresis of the pre-set CH temperature. It is the difference between
the temperature of entering the sustain mode and the temperature of restoring operation mode
(for example: when the pre-set temperature is 60 ºC, the hysteresis is 3ºC, entering sustain
mode takes place at the temperature of 60 ºC whereas returning to the operation mode takes
place at 57 ºC).
V.d.3) Pre-set DHW temperature
This function is used to define the pre-set temperature of domestic water. Once the water in the
DHW tank has reached the pre-set temperature, the controller disables DHW pump. It will be
activated again when the temperature drops below the pre-set value by DHW hysteresis ( DHW
sensor reading).
V.d.4) DHW hysteresis
This option is used to define the hysteresis of the pre-set water tank temperature.
It is the maximum difference between the pre-set temperature (desired temperature of DHW
tank) and the temperature of restoring operation.
Example: if the pre-set temperature is 55°C and the hysteresis value is 5 °C, the DHW pump is
switched off when the set temperature of 55°C is reached and it is activated again when the
temperature drops to 50 °C.
V.d.5) Pump switch on temperature
This option is used to define the temperature of CH pump and DHW pump activation (temperature
measured at the CH boiler). Below this temperature value both pumps remain inactive whereas
above this value the pumps are enabled and operate according to the current operation mode
(see: pump operation modes).
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