FULTON VSRT 50 - Page 52

3  OPERATION
© Fulton 2018
3-8
VSRT_IOM_2018-1213
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 ashing).
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 ashing to
signify that it is set. Press the “Display” key to return to
the Set Point (SP) home screen.
To adjust the “Boiler O” 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 ashing).
Use the directional up and down arrows to change the
value. With a positive setting for Hy1, the boiler will turn
o over the selected set point. To adjust your “Boiler O”
set point, you have to calculate the dierence between
your “Boiler On” set point value and the “Boiler O” set
point value. Example: Boiler On at 100 PSIG and Boiler
O 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
ashing 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
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% ring rate.
8. The smaller the number, the longer the unit will
remain at 100% ring 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 ring
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 dened 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.
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