Bosch Appliances 100 Combi Boiler manual Summary

2.7System 7: Greenstar Heating Boiler in a single zone system with DHW tank loading

Summary:

Single boiler with primary/secondary piping configuration 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 3 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 identical to System 5 with an added indirect fired DHW tank.

Use this system over System 6 where the combi-boiler does not have the required DHW volume flow capacity; keep in mind however that the tank capacity is not endless compared to that of the combi-boiler.

In detail:

The FW200 is an outdoor temperature based controller with room temperature influence. 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.

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).

Indirect Fired DHW Tank.

Tank loading pump of sufficient capacity.

Additional instructions:

See manufacturer’s installation and operating instructions.