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Installation
6
Installation
DANGER:
Explosion
▶ Close gas cock prior to working on the gas train
▶ Check for gas leaks after carrying out work on the gas train
Installation, power connection, connection on the gas and flue gas side
and commissioning must only be carried out by a contractor certified for
such work by the state or local jurisdiction or the local gas or power
utility.
Transportation blank plugs
▶ Remove the blanking plugs from the appliance water connections.
There may be some water present from the appliance testing.
6.1
Important notes
Fill and make-up water for the heating system
Unsuitable fill and make-up water can result in the heating system scaling
up or failing prematurely.
Recommended steps for commissioning a new or retrofit boiler
installation
▶ Flush the system with clean water.
▶ Isolate the boiler, fill the system with fresh water and a boiler cleaner,
run for 30 minutes to 1 hour. Under no circumstances may boiler
cleaner be pumped through the boiler.
▶ Thoroughly flush the system with fresh water. Ensure all zones and
loops are flushed.
▶ Empty out sediment traps.
▶ Systems containing antifreeze not approved by Bosch, must be
completely flushed to ensure no old fluid remains.
▶ Fill the system with fresh water and the proper amount of inhibitor.
▶ Verify the pH is within the proper range.
▶ Add additional inhibitor if pH is not within the proper range.
▶ Check pH annually.
▶ If using antifreeze, fill with approved antifreeze and fresh water.
▶ Always follow the cleaner, antifreeze, or additive manufacturer's
instructions.
▶ Do not mix different manufacturer's products
▶ Follow manufacturer's data to determine the anti-freeze ratio for the
desired freeze protection temperature.
Recirculation pump/DHW recirculation lines
A recirculation pump can be installed. Control and electrical connection
are not possible via the appliance's electronics. Additional accessories
are required for this.
▶ Connect the DHW circulation line at the cold water inlet as close as
possible to the hydraulics connection plate.
32
Total length DHW/recirculation
line
≤ 33 ft (10 m)
33 - 66 ft (10 - 20 m)
66 - 98 ft (20 - 30 m)
Table 14 Recommended flow rates
You can display the flow rate through the heat exchanger with the service
function 6.d current flow through the turbine ( page 60).
Open vented heating systems
▶ Convert open vented heating systems into closed systems.
Gravity heating systems
▶ Connect the appliance to the existing piping system via a low-loss
header with a sludge separator.
Galvanized radiators or pipes.
To prevent gas formation:
▶ Do not use galvanized radiators or pipes.
Plastic pipework
If using plastic pipework for the heating system (eg.underfloor/radiant
heating), the type of pipe that should be used must be oxygen tight.
Use of a room temperature controller
▶ Do not install thermostatic valves on radiators in the primary room.
Primary-secondary piping or Low Loss Header (LLH)
Enable the integrated Low Loss Header if hydraulic separation is
required and not already provided by a configuration external to the
appliance.
Typically all multi zone applications with any combination of emitters like
baseboard, panel radiator or radiant would require primary secondary
piping or a low loss header for hydraulic separation.
In addition to that some larger single zone applications exceeding a flow
rate of 4.0 gpm requires primary secondary piping or a low loss header
to achieve hydraulic balance.
A Low Loss Header is used to achieve hydraulic balance on either side of
the appliance, using the lowest pump speed that delivers heat to all the
radiators in the system.
Radiant floor, panel radiator, multi zone and application systems
exceeding 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, require primary-
secondary piping or a low loss header for hydraulic separation of the
system from the boiler.
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
Flow rate
0.66 gpm (2.5 l/min)
0.92 gpm (3.5 l/min)
1.32 gpm (5 l/min)
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