CONTROL METHODS HeatNet Control V3
Page 21
Mixed Condensing/Non-Condensing Boiler
System
Local Pump
Local Pump
MASTER
Condensing
MEMBER 1
Condensing
HNETHNET
Header Sensor
System Return Sensor
HNET
Local Pump
Local Pump
System Pump
MEMBER 2
Non-
Condensing
MEMBER 3
Non-
Condensing
Priority 1 Set Priority 2 Set
M
Combustion Air Damper
Outdoor Air Sensor
Outdoor Air
Sensor
Note: The example drawings in this section are simplified.
They are meant to illustrate connections to the HeatNet V3
control. Only major components are illustrated. The system
engineer must ensure additional safeties, piping,
maintenance valves, and components meet code
requirements and safe operation.
Mixed Boiler System Examples
Futera III/Fusion/ Boiler Btu Chart (MBH)
Futera XLF Boilers
For the examples, the RBI FIII/Fusion series water heaters
will be used. These boilers are non-Condensing, fully
modulating, low mass, and HeatNet compatible.
If CB/CW Fusion boilers are substituted for the MB/MW
Futera III boilers, the efficiency is greatly increased due to
the condensing mode of these boilers. When using CB/CW
Fusion boilers, at lower firing rates, the combustion
efficiency is maximized by running the CB/CW Fusion
boilers from low to middle input rates. See: Typical
Efficiency of Condensing Boiler graph.
The Mixed Boiler System table show some examples of
mixed systems using different sizes along with Fusion
condensing (Priority 1) and Futera III non condensing
(Priority 2) boilers.
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