Viessmann Vitodens 200-W B2HA series, Application Manual

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In this system you have a Vitodens 200 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 input DE1 of the EA1 module. The 157 plug connected P3 pump will turn on and the
boiler will use the ZC set point to provide a target boiler water temperature. In the event there is a call for DHW,
the P1 circulator will turn off and P2 will be engaged. This will provide a domestic priority function for the purpose
of quickly satisfying a DHW demand. It is recommended to use a variable speed circulator for P3 that will adjust
flow based on opening/closing zone valves. If a single speed pump is being used, ensure a pressure differential
bypass is incorporated into the system to avoid “over pumping” a single circuit when a zone is calling for heat.
Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point with 157 Pump Output
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 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