Controller Operation; Pressure Display - Greenheck Vari-Green Control Installation, Operation And Maintenance Manual

Controller Operation

The Constant Pressure Control has three buttons
accessible through the lid: Enter, Up or Increase
(▲), and Down or Decrease (▼). Additionally on the
circuit board inside the lid is jumper J5. J5 is used
to set the controller into normal operation, RUN, or
programming mode, PROG.
Normal Operation (J5 = RUN)
The Constant Pressure Control ships from the
factory to control pressure on the inlet of the fan
with a setpoint of -0.10 inches of water pressure, the
display showing real time duct pressure in inches of
water and the cutout disabled. Pressing the buttons
on the controller lid will show the following for 10
seconds;
• Enter, LED color Cyan, Cutout percent stored in
parameter P06
• Up/Increase, LED color Yellow, Setpoint pressure
stored in parameter P01.
• Down/Decrease, LED color Green, Real time
output voltage in percent.
Note: If Display Units parameter P04 is set to 0,
then the normal display will show real time output
voltage in percent and pressing the Down/Decrease
button will display real time duct pressure.

Pressure Display

The pressure display reads in engineering units.
The display will only indicate pressures from 1.00 to
-1.00 inches of water. If the pressure is above 1.00
or below -1.00 inches of water then, the display will
flash the 1's digit.
Programming (J5 = PROG)
Programming allows the user to customize the
operation on the Constant Pressure Control. The
color of the LED is red during programming mode.
If power to the controller is lost, all settings will be
retained.
RUN
Position
General Programming
• Place the J5 jumper on the PROG position,
LED = Red
• During programming, output to fan is disabled
• The display will read P01
• Press the Up/Increase or Down/Decrease button
to change the parameter number
• Press the enter button to edit the parameter
o Press the Up/Increase or Down/Decrease
o Press the Enter button to save the change
• The display will read the parameter number just
edited
• Continue until all the parameters needing editing
are completed
• Always stop with a parameter number showing
• Place the J5 jumper on the RUN position,
LED = Green
button to change the parameter. Pressing and
holding the button will scroll the numbers
PROGRAM
Position
5