AERCO BMK 1500-2000 - Manual (Page 136)

Benchmark 1500 - 2000 Boilers
APPENDIX A: BOILER MENU DESCRIPTIONS
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APPENDIX A: 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
1.00 (Default is 1.0).
Derivative Time This value (0.0 to 2.0 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 next 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.