Application - Viessmann Vitocrossal 300 CU3A Application Manual

Vitocrossal CU3A
Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point OR Weather Compensated
This particular application represents a high mass boiler with a single system loop. When the ZC1 thermostat calls
for heat, the boiler will turn on the configured 28/20 P3 pump providing the necessary flow. Depending on the ZC1
configuration, it is possible to provide either a fixed setpoint or a weather compensated control option.
Fixed Setpoint: Enter the
value that is to be used
by the boiler as a target
water temperature when
there is a call for heat.
Weather Compensated:
The Slope and Shift
settings can be adjusted
to allow a heating
curve to be set. When
there is a zone heat
demand, the calculated
set point will be used
as long as the demand
is present.
20
Select the correct number
of Zone Circuit connections
with respect to the number
of thermostats connected to
the DE connections.
Press OK
Depending on how the
zone temperature set
point is determined, select
either Fixed Setpoint or
Weather Compensated.
Select the desired pump
output that will be enabled
during a ZC call. When there
is a call, the output will be
energized for the duration
of the call. For this
application the P3 pump was
wired to the 28/20 output.
The zone circuit setting
output summary shows
the selected pumps
depending on the number
of zones selected in the very
beginning. Press the back
button if the summary
is incorrect.
The Start-up is finished and
boiler is ready for operation.