Watts AERCO Benchmark OMM-0121 Operation And Maintenance Manual page 79

Benchmark 750-3000 Boiler Operation & Maintenance Manual
APPENDIX A: BOILER MENU DESCRIPTIONS
TABLE A-4: TUNING MENU ITEM DESCRIPTIONS
See section 2-7 TUNING Menu for a range of choices and the default values.
TABLE A-4: TUNING Menu Item Descriptions
MENU OPTIONS
1
Prop Band
2 Integral Gain
3 Derivative Time
Warmup – The feature embodied in menu items 4, 5 and 6 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
4
Band
5 Warmup Int Gain
Warmup PID
6
Timer
7
Reset Defaults?
OMM-0122_D • GF-206 • 5/9/2019
DESCRIPTION
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°F to 120°F, 0.55°C to 66°C), 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%.
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).
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.
Range = 1 – 120°F (0.55°C to
66°C)
Range = 0.00 – 2.00
Range = 0 - 240 seconds
Allows Tuning menu options to be reset to their Factory
Default values.
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Default = 95 (52°C)
Default = .50
Default = 20 seconds
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