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Applications Manual Bosch Greenstar | 45
Bosch Thermotechnology Corp.
Data subject to change
2.9 System 9: Greenstar Heating Boiler in a
single zone system with solar thermal
DHW and boiler backup
Summary:
Single boiler with primary/secondary piping confi guration
supplying one heating zone. Outdoor reset with FW200
controller with built-in room sensor mounted in the living
space for room feedback.
Use this design where System 4 cannot be used due to too
great a system pressure drop. Primary/secondary piping is
also required for radiant fl oor and panel radiator applica-
tions.
Primary/secondary piping isolates the system fl ow from
the boiler fl ow and prevents the system from infl uencing
boiler performance.
Solar thermal provides renewable energy to heat DHW year
round, and if sized properly reduce energy consumption
signifi cantly. Bosch offers plug and play components
that are designed to work together with a boiler backup
system. Bosch solar thermal systems are qualifi ed for
government and utility incentives reducing the upfront
investment cost signifi cantly. Bosch solar thermal
collectors work even in the winter and under cloudy skies
preheating water, and reducing boiler run time and burner
starts.
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
as a room sensor, it uses room temperature to adjust the
heating curve and modify boiler supply temperature ac-
cordingly.
FW200 provides warm weather shutdown.
The control of the solar thermal system is integrated with
the FW200 boiler control, and reduces boiler run time
and burner starts signifi cantly compared to independent
systems. The solar pump will run whenever the collectors
are 16°F (9°C) warmer than the bottom of the solar tank.
For temperature sensitive radiant fl oor applications install
a thermostatic tempering valve for overheat protection.
Required components:
Greenstar heating boiler.
FW200 controller in the room.
Primary/secondary piping and system pump.
Thermostatic mixing vavle (optional - overheat
protection for temperature sensitive floors).
ISM2.
DHW solar tank with 2 coils.
Bosch solar thermal system complete.
Tank loading pump of sufficient capacity.
Additional instructions:
See manufacturer’s installation and operating instructions.
The Bosch Greenstar boiler and ISM2 offer many different
solar thermal applications including space heating sup-
port and pool heating. Please consult the installation and
operating instructions for details.