Viessmann Vitocrossal 300 CU3A Application Manual page 44

Vitocrossal CU3A
Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point with 28/20 Pump Output
This application shows 2 heat circuits with mixing valves, a high temperature zone circuit, and an indirect DHW
tank. This system approach maximizes system efficiency, control and comfort through precise water monitoring.
The ZC1 thermostat call for heat will enable 28/20 output to power the P3 pump providing flow in the unmixed
temperature heating circuit. The ZC1 circuit can be configured to operate based on a Fixed Setpoint demand
temperature or a Weather Compensated demand. The HC2 and HC3 mixing valve controls will operate based on
heat curve settings from within the boiler.
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Select the 1 Zone Circuit with respect to the ZC
thermostat connected to the DE connections.
Press OK
This application is based on a Fixed Setpoint
temperature during a zone call for heat. Press OK
to confirm selection.
Enter the value that is to be used by the boiler as
a target water temperature where there is a call
for heat. You can adjust the values by arrowing
down or up to the correct set point value and
press OK.
The pump based on this application is controlled
by the 28/20 output. Arrow down until 28/20 Output
is highlighted and press OK.
The zone circuit setting output summary shows
the selected pumps depending on the number of
zones selected in the very beginning. Press OK to
continue.
The Start-up is finished and boiler is ready for
operation. Press OK to continue