Applications Manual | Bosch Greenstar 17 |
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2.2System 2: Greenstar Combi Boiler in a single zone system
Summary:
Single
The “combi” or combination boiler is a high efficiency central heating boiler and water heater combined within one compact unit. Water is heated on demand directly from the water main eliminating the need for a hot water storage tank.
This design can only be used with a single loop baseboard system that has a low pressure drop. Radiant floors, panel radiator, or multi zone systems require
The pump will run in constant circulation while in space heating mode except during a call for DHW or when in warm weather shutdown.
Max. 70' (21 m) of 3/4" baseboard at a 20°F delta T and a flow rate of 4.0 gpm plus the necessary supply and return piping..
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, it also uses room temperature to adjust the heating curve and modify boiler supply temperature.
FW200 provides warm weather shutdown.
Required components:
Greenstar
FW200 controller in the room.
Additional instructions:
See manufacturer’s installation and operating instructions.
Install an adequately sized Pressure Relief Valve (PRV) on the DHW outlet of the combi boiler.
To reduce the risk of scalding it is recommended to install a DHW tempering valve.
The Greenstar combi boiler is equipped with an inter- nal 3.17 gal (12 liter) expansion vessel. The installation manual provides information on how to determine if it is of sufficient capacity for the application or if an additional expansion vessel is needed.
Bosch Thermotechnology Corp. | Data subject to change |
