AERCO KC1000 Heater 2002 - Manual (Page 76)

APPENDIX A
A-4
WATER HEATER 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%. (Default is 8°F for a Water Heater)
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 1.60 for a Water
Heater).
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. (Default is 0.10 min. for
a Water Heater)
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 all Tuning Menu items to be reset to their
Factory Default values.
*Only displayed when Heater Tuning Display is enabled by factory authorized
personnel.