Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL
APPENDIX A: BOILER MENU DESCRIPTIONS
Page
134
of
170
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GF-130-I
Table A-4: Tuning Menu Item Descriptions
See section 3-7 for a range of choices and the default values.
TUNING MENU
MENU OPTIONS
DESCRIPTION
1
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°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%.
2
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).
3
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 menu items 4, 5 and 6 eliminates Temperature
Overshoots during the “Warmup” period of a cold ignition cycle on all Heating Boilers by
temporarily modifying the PID Gain parameter during warmup and for a period defined in the
Tuning
menu.
4
Warmup Prop Band
Range = 1 – 120°F (0.55°C to 66°C) Default = 95 (52°C)
5
Warmup Int Gain
Range = 0.00 – 2.00
Default = .50
6
Warmup PID Timer
Range = 0 - 240 seconds
Default = 20 seconds
7
Reset Defaults?
Allows
Tuning
menu options to be reset to their Factory
Default values.
