Application - Viessmann Vitocrossal 300 CU3A Application Manual

Vitocrossal CU3A
Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point with 157 Pump Output
In this system you have a Vitocrossal CU3A with an indirect water heater and a four-zone single temperature
system. Upon a call for heat from one of the four zone thermostats, the respective zone valve will open. The end
switch will provide a demand and the 28/20 output connected P3 pump will turn on providing a target boiler water
temperature. In the event there is a call for DHW, the P2 circulator will be engaged. This will provide a domestic
priority function for the purpose of quickly satisfying a DHW demand.
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Since this particular application is a single
temperature circuit, select 1 Zone Circuit from
the menu options.
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