AERCO BMK 2.0 LN October 2012 - Manual (Page 124)

Appendix A
Benchmark 2.0LN Low NOx Boiler
GF-123
Menu Items Installation, Operation and Maintenance Manual OMM-
0046_0F
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Table A-1: Boiler Menu Item Descriptions-Continued
MENU LEVEL & OPTION DESCRIPTION
TUNING MENU
Prop Band
Generates a fire rate based on the error that exists
between the setpoint temperature and the actual outlet
temperature. If the actual error is less than the
proportional band setting (1 to 120°F), the fire rate will
be less than 100%. If the error is equal to or greater
than the proportional band setting, the fire rate will be
100%.
Integral Gain
This sets the fraction of the output, due to setpoint
error, to add or subtract from the output each minute to
move towards the setpoint. Gain is adjustable from
0.00 to 2.00. Default is 1.00 for boilers.
Derivative Time
This value (0.0 to 20.0 min.) responds to the rate of
change of the setpoint error. This is the time that this
action advances the output.
WARMUP: The feature embodied in the following three menu items eliminates
Temperature Overshoots during the “Warmup” period of a cold ignition cycle on all
boilers by temporarily modifying the PID Gain parameter during warmup and for a period
defined in the Tuning Menu
Warmup Prop Band Range = 1-120 Default = 95
Warmup Int Gain Range = 1-200 Default = 50
Warmup PID Timer Range = 1-240 Default = 20
Reset Defaults?
Allows Tuning Menu options to be reset to their Factory
Default values.