HBX CPU-1000 HVAC Controller
Version 1.38
© HBX Control Systems Inc. 2012
Page 21
MODULATION TYPE: PARALLEL
The Parallel method of modulating boilers is the
simplest of modulating algorithms. Underlying theory
causes all of the installed boilers to simultaneously
modulate from the start percent (designated by the
installer within the modulating options of the Control)
to 100% depending on the system load requirements.
The maximum number of modulating boilers that the
Control can handle is five.
The process of modulating the boilers off works in
the same manner. When the load decreases, all of the
boilers will modulate down until they are at the start
percent . At this point, to help with boiler cycling, the
Control will allow the PID calculation to increase. This
will hold the lead boiler in the minimum fire
position(or start percent) for longer allowing the
modulating boiler to cycle less. As a result; system
maintenance and system wear due to boiler cycling is
decreased.
BTU Output
Boiler 1 Boiler 2 Boiler 3 Boiler 1 Boiler 2 Boiler 3 Boiler 1 Boiler 2 Boiler 3
Modulating Staging Types - Parallel
0%
100%
50%
25%
75%
Time Progression
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