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5833 275 - 04
Vitotrans 300 Installation, Operating and Service
Installation
Electrical Connections
(continued)
Connect the heat demand dry contacts from terminal
block X2 terminals 1 and 2 to the external demand of
the heat source control (building management system
or heating system).
When installing multiple Vitotrans, wire the heat
demand contact from each Vitotrans in parallel to the
heat source control (building management system or
heating system).
Terminal
Block X2
Dry contact
heat demand
to building
management
system
or heating system
Heat demand
The system heat source (boiler) should be set to supply
water to the Vitotrans 300 at least 20ºF (11ºC) higher
than the desired DHW setpoint.