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Applications Manual Bosch Greenstar | 17

Bosch Thermotechnology Corp.

Data subject to change

2.2 System 2: Greenstar Combi Boiler in a

single zone system

Summary:

Single combi-boiler supplying one baseboard heating

zone equipped with FW200 outdoor reset controller with

built-in room sensor in the living space. DHW generation

directly off the boiler through the tankless heat exchanger.

This system is using the boiler pump for zone water circu-

lation.

The “combi” or combination boiler is a high efﬁ ciency

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 ﬂ oors, panel

radiator, or multi zone systems require primary-secondary

piping. Do not install zone valves with this system.

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

ﬂ ow 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 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.

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 sufﬁ cient capacity for the application or if an additional

expansion vessel is needed.

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