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Bosch Greenstar Applications Manual
Bosch Thermotechnology Corp.Data subject to change
Bosch
Date
...
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Expansion Tank
Auto-Fill
Air Eliminator
Shut-off
valve
Back-flow
preventer
PRV Relief
Piping
Condensate
drain
Room
Thermostat
Flow Check
Heating
zone
Circulator
Purge Drain
DISCLAIMER: Application drawings
in this manual are conceptual only
and do not purport to address all
design, installation, code, or safety
considerations. The diagrams in
this manual are for reference use by
code officials, designers and
licensed installers. It is expected
that installers have adequate
knowledge of national and local
codes, as well as accepted industry
practices, and are trained on
equipment, procedures, and
applications involved. Drawings are
not to scale. Refer to the boiler,
control and module installer
manuals for additional detailed
information.
T
T
T
T
T
T
Note: Larger heating systems
may require an additional
expansion tank external to the
boiler – see manual for details.
Domestic
Cold Water
Domestic
Hot Water
Gas
Supply
Bosch
Control
Supply
Sensor
Note: See Appendix B for
Primary/Secondary piping
requirements
Multi Zone
Combi wall boiler
Circulators
Bosch Control with
Zone Relay
Bosch
Control
Zone relay
X X
Do not connect end-
switch of relay to boiler
Locate the Bosch Control
in the zone with the
greatest heat loss. See
additional requirements
below.
Requirements for the location of the Bosch Control in a multizone application :
The Bosch Control must be installed in the zone with the largest btu/hr heat
loss
The zone must also have the highest or same supply temperature
requirement as compared to all other zones in the system.
Thermostats located in all other zones will act as temperature limiters.
A higher room temperature request in these zones may not be able to be
achieved. Avoid large temperature setback due to potentially slow recovery
during occupied periods.
The pump supplying
the zone with the
Bosch control must
be wired to the
Greenstar Boiler
(see wiring diagram)
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