Parameter Descriptions - Greenheck Vari-Green Control Installation, Operation And Maintenance Manual

Parameter Descriptions

Parameter Description
P01 Pressure Set Point
P02 Auto Zero
P03 Factory Defaults
P04 Display Units
P05 Algorithm Gains
P06 Cutout Percent
P07 Cutout Delay Timer
P08 Override Output Percent
P09 Pressure Input Filter
P10 Fan-Inlet/Fan-Outlet Control
Pressure Set Point, Parameter P01
Factory Default = -0.10 inches of water.
-1.00 to 0 inches of water in increments of 0.05
inches, fan inlet control only.
0 to 1.00 inches of water in increments of 0.05
inches, fan outlet control only.
Auto Zero, Parameter P02
Factory Default = 0
0 = entry condition
1 = Perform Auto Zero
Auto zero sets the zero pressure reading of the
controller. Greenheck recommends performing auto
zero after installation and before first operation.
Place a piece of tubing from tubing connector "H" to
tubing connector "L". Set value to 1 and press the
Enter button. The LED will turn white. Auto zero
is complete when the LED turns red. Remove the
tubing from the tubing connectors and reconnect the
pressure tap.
Factory Defaults, Parameter P03
Factory Default = 0
0 = entry condition
1 = Set all parameters to the factory default setting
Display Units, Parameter P04
Factory Default = 1
0 = Normal display is output percent
1 = Normal display is inches of water
Algorithm Gain, Parameter P05
Factory Default = 0
0 = Factory gains
1 = Gain set A
2 = Gain set B
If gain set 0 does not achieve stable operation use
one of the other sets to achieve stable operation.
6
Cutout Percent, Parameter P06
(Fan inlet control only)
Default Setting
Factory Default = 20%
-0.10 inches of water
0 (see below)
20% = Cutout disabled, fan on continuously.
0 (see below)
20% to 100% in 0.1% increments
1 (inches of water)
0 (factory gains) The cutout feature can only be used if the system
20%
utilizes powered fans such as bathroom fans or
30 seconds
dryers. It will not function properly if passive devices
100%
are installed in the system such as motorized
0 seconds
dampers.
1 (fan inlet control)
The cutout percent needs to be set if you would like
the exhaust fan to turn off when there is no demand
on the system. The default value is set at 20%. If the
exhaust fan is required to operate at all times, leave
the cutout percent value at 20%.
When the output percent is less than the cutout
percent, the cutout timer is activated (The timer
value is in parameter P07). After the time has
elapsed, the fan will shut off.
Note: A cutout percent value is only valid for a
discreet pressure set point. When the pressure
set point is changed, the cutout percent value must
be adjusted as well. It is recommended that you
make sure your pressure set point is correct before
continuing.
To set the cutout percent value, the following steps
need to be followed:
• Set normal operation and verify the system is
• After the pressure has stabilized at the set point,
• The recommended Cutout Value is 1-2
maintaining the desired pressure set point with
no other equipment (dryers, bathroom fans, etc.)
operating.
press the Down/Decrease button to show the
percent output voltage. Take note of this value.
(The value will fluctuate slightly within +/- 2%. A
mental average will be adequate.)
percentage points above the value you noted
in the previous step. See above for a graphical
representation.