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Applications Manual
Bosch Heatronic 4000 Controls | 9
3.2 Boiler Connections
The SB Series condensing boilers can utilize a variety
of fuel sources, natural gas, LP gas, oil, ultra low sulfer
diesel. Riello, Beckett and Powerfl ame Burner models are
available in single stage, two stage, modulating and dual
fuel type signals. SB Series Boilers have three connections
points all out the top. One connection is the heating fl ow
outlet (supply). The supply is near the front of the boiler.
Next looking from front to back is the heating return high
temperature connection, and the last is the heating return
low temperature connection.
In common single temperature heating systems applica-
tions the return low temperature connection is utilized
while the return high temperature connection is capped.
In multi-temperature applications, both returns are used to
take better advantage of the SB Series condensing tech-
nology. In Multi- temperatures systems, the low tempera-
ture return is seperated from the high. This confi guration
requires that a minimum of 20% of the total heating system
load is split into the low temperature return connection.
The G Series boilers with Thermostream Technology are
conventional non-condensing boilers that utilize the same
burners as the SB Series. G Series boilers have one supply
and one return connection, both coming out the back cent-
er of the boiler, supply is the top connection and return is
the bottom connection.
The GB Series Boilers are gas only boilers. The GB142 and
GB162 are both wall hung gas condensing boilers with
heating supply and return connections out the bottom
of the unit. Same as for the gas connections.The supply
connection is on the left and the return conneciton is on
the right when facing the boiler, the gas connection is in
the middle. The GB312 is a fl oor standing gas condensing
boiler with the supply connection is the upper right corner
and the return in the lower left corner when facing the
front of the boiler.
Bosch Thermotechnology Corp.
Data subject to change
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