Viessmann Vitocrossal 300 CU3A Application Manual page 40

Vitocrossal CU3A
Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point with 157 Pump Output
This application shows a low temperature heat circuit with 3-way mixing valve, a high temperature heating circuit
ZC1 and an indirect DHW tank that is controlled by an aquastat. This application allows for simultaneous operation
of both space heating and DHW, just remember to size your boiler accordingly. A ZC1 call will turn on the configured
157 plug connected pump providing flow for the high temperature zone. The HC2 mixing valve will operate from
heating curve settings, set within the boiler control. The ZC2 demand from the DHW aquastat will be sensed by the
DE2 input and turn on the associated 28/20 pump output during control configuration.
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Select the correct number of Zone Circuit
connections with respect to the number of
thermostats 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 157 output. Arrow down until 157 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