AERCO KC1000 Low NOx Water Heater July 2011 - Manual (Page 82)

APPENDIX A
A-4
APPENDIX A - WATER HEATER MENU ITEM DESCRIPTIONS - Continued
MENU LEVEL & OPTION DESCRIPTION
TUNING MENU
Prop Band Generates a valve position 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
valve position will be less than 100%. If the error is
equal to or greater than the proportional band
setting, the valve position 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.
Min Load Adj Setting is adjustable from -50°F to +50°F (Default is
zero). It adjusts the output by adding an offset to
the breakpoint chart at minimum flow. This is used
to fine tune Feed-Forward (FFWD) output at low
flow levels.
Max Load Adj Setting is adjustable from -50°F to +50°F (Default is
zero). It adjusts the output by changing the scaling
of the breakpoint chart at maximum flow.
FFWD Temp Displays the Feed-Forward temperature.
Outlet Feedback Used to Enable or Disable feedback. Disable this
function for Feed-Forward control only.
Feedback Gain* Adjustable from 0.01 to 1.00 (Default is 0.05).
Breakpoint at 100%
Thru
Breakpoint at 0%
Allows breakpoint temperature settings (30°F to
240°F) to be entered for 100% to 0% in 10%
increments. See Appendix D for default values.
Reset Defaults? Allows Tuning Menu options to be reset to their
Factory Default values.
*Only displayed when Heater Tuning Display is enabled by factory authorized
personnel.