Tech Controllers ST-976 User Manual page 40

 House heating

Without room regulator and buffer (Fire‐up function):
This option should not be selected because in such a case it will remain inactive.

Room regulator ON, without buffer (Fire‐up function + Room regulator):
When the fire‐up function is selected, the room regulator controls the CH boiler operation. When the pre‐set
room temperature is reached, the CH boiler is disabled. It will be enabled again when the room temperature
drops by the pre‐set hysteresis value. When this function is inactive, the CH boiler operates according to pre‐
configured operation parameters.

Buffer ON (Fire‐up function + Buffer + DHW function from CH boiler or buffer):
When the fire‐up function is selected, the buffer controls the CH boiler operation. When the pre‐set buffer
temperature is reached, the CH boiler is disabled. When this function is inactive, the CH boiler operates
according to pre‐configured operation parameters (damping and fire‐up based on CH sensor). DHW function
serves no role in this case, but it should be selected depending on the type of heating installation.
 Water tank priority

Without room regulator and buffer (Fire‐up function):
This option should not be selected because in such a case it will remain inactive.

Room regulator ON, without buffer (Fire‐up function + Room regulator):
The CH boiler is damped when the pre‐set DHW temperature is reached and the room regulator informs that
the pre‐set room temperature has been reached. Emergency CH boiler damping will be carried out when the
pre‐set CH temperature is exceeded by 5°C.

Buffer ON (Fire‐up function + Buffer + DHW function from buffer):
When the pre‐set temperature of buffer bottom is reached (C2 sensor), CH boiler damping will start
regardless of CH and DHW temperature. The main screen displays 'Buffer pre‐set temperature reached'
below Fire‐up/Damping touch buttons. Emergency damping will also start when the pre‐set CH temperature
is exceeded by 5°C.

Buffer ON (Fire‐up function + Buffer + DHW function from from CH boiler):
When the pre‐set temperature of buffer bottom is reached (C2 sensor) as well as the pre‐set water tank
temperature is reached, CH boiler damping will start regardless of CH temperature. The main screen displays
'Buffer pre‐set temperature reached and Pre‐set DHW temperature reached' below Fire‐up/Damping touch
buttons. Emergency damping will also start when the pre‐set CH temperature is exceeded by 5°C.
 Parallel pumps

Without room regulator and buffer (Fire‐up function):
This option should not be selected because in such a case it will remain inactive.

Room regulator ON, without buffer (Fire‐up function+Room regulator):
The CH boiler is damped when the pre‐set DHW temperature is reached and the room regulator informs that
the pre‐set room temperature has been reached. Emergency CH boiler damping will be carried out when the
pre‐set CH temperature is exceeded by 5°C.

Buffer ON (Fire‐up function + Buffer + DHW function from buffer):
When the pre‐set temperature of buffer bottom is reached (C2 sensor), CH boiler damping will start
regardless of CH and DHW temperature. The main screen displays 'Buffer pre‐set temperature reached'
below Fire‐up/Damping touch buttons. Emergency damping will also start when the pre‐set CH temperature
is exceeded by 5°C.

Buffer ON (Fire‐up function + Buffer + DHW function from CH boiler):
When the pre‐set temperature of buffer bottom is reached (C2 sensor) as well as the pre‐set water tank
temperature is reached, CH boiler damping will start regardless of CH temperature. The main screen displays
'Buffer pre‐set temperature reached and Pre‐set DHW temperature reached' below Fire‐up/Damping touch
buttons. Emergency damping will also start when the pre‐set CH temperature is exceeded by 5°C.
40