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Additional Information
Boiler Protection
22
Boiler Protection
Minimum boiler temperature protection has been selected for all Vitotronic
controls. It is the responsibility of the installer to determine the requirements of
the boiler for each specific installation. The minimum boiler temperature function
may be disabled; to do so, refer to table in subsection "Minimum Boiler
Temperature Setting".
The boiler construction determines the necessity of a minimum boiler temperature
protection function.
Minimum boiler temperature protection is the result of two combined functions of
the Vitotronic, KK10 control:
–activation of the burner
–deactivation of the space heating pump.
The Vitotronic 100, KK10 control uses a pump aquastat (PA) to maintain minimum
boiler temperature. The aquastat uses a probe-type mechanical limit which
monitors the boiler temperature. When the boiler temperature drops below the
setpoint of the pump aquastat, the burner activates and the space heating pump is
deactivated.
The space heating pump may be connected to the KK10 control in one of two
ways:
–using a boiler-mounted pump junction box
–using a DHW pump module (accessory).
The presence of the boiler-mounted pump junction box is determined by the
boiler-specific construction.
When the space heating pump is connected to the boiler-mounted pump junction
box, the pump is deactivated when the boiler water temperature drops below the
pump aquastat setpoint. If continuous operation of the space heating pump is
required, a separate power supply connection is needed. When connecting the
pump to a direct power supply, the use of a pump on/off switch is recommended.
When the space heating pump is connected to the boiler via the DHW pump
module, pump operation is similar to that with pump connection via the pump
junction box. When the boiler temperature drops below the aquastat setpoint, the
space heating pump is switched off. If a DHW pump is connected, it also is
switched off. To modify pump operation, refer to table in subsection "Minimum
Boiler Temperature Setting".
Burner activation is similar to that of the pump control. When the boiler
temperature drops below the pump aquastat setpoint, the burner is activated.
Once the boiler water temperature climbs above the setpoint temperature of the
aquastat, the burner is deactivated.
Minimum temperature protection (in ON position) can be turned off by changing
the position of the DIP switch S1.4 (downward movement of the DIP switch).
Please refer to table in subsection "Minimum Boiler Temperature Setting".
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