Summary | Bosch Appliances 100 Combi Boiler instruction

Bosch Appliances 100 Combi Boiler manual Summary

Applications Manual	Bosch Greenstar 41

2.8System 8: Greenstar Heating Boiler in a single zone system with room thermostat and DHW tank loading

Summary:

Single boiler with primary/secondary piping conﬁguration supplying one heating zone. Outdoor reset with FW200 controller mounted on the boiler. 3rd party room thermo- stat used to communicate heat demand.

This system is identical to System 7 except that it does not feature constant circulation. The system circulator runs only when a heat demand is communicated by the room thermostat and shut off when the heat demand goes away.

Use this design where Systems 1 through 4 cannot be used due to too great a system pressure drop. Primary/ secondary piping is also required for radiant ﬂoor and panel radiator applications.

Primary/secondary piping isolates the system ﬂow from the boiler ﬂow and prevents the system from inﬂuencing boiler performance.

This system is designed for installations with other heat sources, e.g. wood stoves or signiﬁcant solar gain. Compared to systems with the FW200 installed in the room that will throttle down the boiler output when the room reaches its set point, in this setup the thermostat will shut the boiler off.

This system can also be used with a combi boiler (see system 6) instead of the indirect ﬁred DHW tank.

In detail:

This system runs on pure outdoor reset without room feedback on the heating curve. The FW200 installed in the boiler adjusts the heating curve (boiler supply temperature) according to outdoor temperature. The 3rd party room thermostat turns the boiler on and off based on the conditions in the living space.

FW200 provides warm weather shutdown.

For temperature sensitive radiant ﬂoor 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 valve (optional - overheat protection for temperature sensitive floors).

3rd party room thermostat ; self powered with dry contact closure.

Indirect Fired DHW Tank.

Tank loading pump of sufficient capacity.

Additional instructions:

See manufacturer’s installation and operating instructions.

Bosch Thermotechnology Corp.

Data subject to change

100 Combi Boiler, Boiler, Combi specifications

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