AERCO BMK 1.5 LN October 2012 - Manual (Page 116)

APPENDIX A Benchmark 2.0LN Low NOx Boiler
GF-120
MENU ITEMS Installation, Operation and Maintenance Manual OMM-0041_0E
Page 116 of 166 AERCO International Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288 PR1:10/18/12
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 1.00 (Default is 0.10).
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
Defaults?
Allows Tuning Menu options to be reset to their
Factory Default values.