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Applications Manual Bosch Greenstar | 21
Bosch Thermotechnology Corp.
Data subject to change
2.3 System 3: Greenstar Heating Boiler in a
single zone system with DHW tank loading
Summary:
Single boiler supplying one baseboard heating zone
equipped with FW200 outdoor reset controller with built-
in room sensor in the living space. This system is using the
boiler pump for zone water circulation and DHW tank load-
ing. A diverter valve is used to switch between space heat-
ing and tank loading. This system is identical to System 1
with an added indirect fi red DHW tank.
This design can only be used with a single loop baseboard
system that has a low pressure drop. Radiant fl oors, panel
radiator, or multi zone systems require primary-secondary
piping.
Max. 70' (21 m) of 3/4" baseboard at a 20°F delta T and a
fl ow rate of 4.0 gpm plus the necessary supply and return
piping.
Ensure to select a DHW tank with a coil pressure drop that
does not exceed the capacity of the boiler pump.
In detail:
The FW200 is an outdoor temperature based controller
with room temperature infl uence. The controller adjusts
the heating curve (boiler supply temperature) according to
outdoor temperature. When the FW200 is wall mounted,
it also uses room temperature to adjust the heating curve
and modify boiler supply temperature.
FW200 provides warm weather shutdown.
Required components:
Greenstar combi-boiler.
FW200 controller in the room.
Indirect Fired DHW Tank.
Diverter valve 120VAC, 3-way, spring return.
Additional instructions:
See manufacturer’s installation and operating instructions.