FULTON VSRT Series Installation, Operation And Maintenance Manual page 74

OPERATION
To adjust the "Boiler On" set point (A1): Press the "Display"
key until A1 is shown on the controller. Press the "Set/Enter"
key to adjust (the value will be flashing). Use the directional
up and down arrows to change the value. With a negative
setting for A1, the boiler will turn back on under the selected
set point. For example, if the set point is 100 PSIG and the
boiler burner is to turn back on at 80 PSIG, A1 would be set to
(negative) - 20.
To adjust your "Boiler On" set point, you choose the negative
number for how far under the set point you would like the
boiler burner to turn back on. Press the "Set/Enter" key once
the desired number is reached to lock in the set point. The
value will now stop flashing to signify that it is set. Press the
"Display" key to return to the Set Point (SP) home screen.
To adjust the "Boiler Off" set point (Hy1): Press the
"Display" key until HY1 is shown on the controller. Press the
"Set/Enter" key to adjust (the value will be flashing). Use the
directional up and down arrows to change the value. With
a positive setting for Hy1, the boiler will turn off over the
selected set point. To adjust your "Boiler Off" set point, you
have to calculate the difference between your "Boiler On"
set point value and the "Boiler Off" set point value. Example:
Boiler On at 100 PSIG and Boiler Off at 120 PSIG, the Hy1
setting is to be 20. Use the directional up and down arrows to
change the value. Press the "Set/Enter" key once the desired
number is reached to lock in the set point. The value will now
stop flashing to signify that it is set. Press the "Display" key to
return to the Set Point (SP) home screen.
To adjust the PID settings, follow the steps below:
1. Pressing the "Fn" button will directly bring you to the
PID parameters
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VSRT-IOM-2022-0728
2. "P" will be displayed
3. Pressing the will display "I. "
4. Pressing the again will display "d. "
5. Pressing DISP will return to SP
6. "P" – Proportional Band
7. Percentage of set point at which the burner begins to
modulate down from 100% firing rate.
8. The smaller the number, the longer the unit will remain
at 100% firing rate.
9. With Proportional only setting, the boiler typically will
never reach set point.
10. "I" – Integral Band
11. How often the unit checks to adjust the firing rate.
12. The smaller the number, the faster the controller reacts.
If it reacts too fast, it will oscillate.
13. Integral setting allows the boiler to reach the set point
14. Fulton standard Integral time setting is "minutes/
seconds per repeat"
15. "D" – Derivative Band
16. Proportional does the heavy lifting getting the
temperature close to the set point and Integral
gradually removes error. Most systems you will not
need it.
17. D is used to compensate for dead (or lag) time.
18. The D term adds to, or subtracts from, the output an
amount defined by the mathematical derivative or rate
of change of the operating value.
19. PID Settings for a typical boiler system with the boiler
correctly sized is P=20 / I=45 / D=0
To change the controllers from Automatic Mode to Manual
Mode
1. Press the "A/M" button until the red light illuminates
next to MAN and OUt is displayed.
2. Use the / to change the output from 0.0 to 100.0
3. To return to Automatic Mode, press the "A/M" key again
and the red light will turn off.
SECTION 3
© Fulton Group N.A., 2022