Controller display and navigation, Programming – Greenheck Vari-Green Control - Constant Pressure Outdoor ( 472864) User Manual
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Vari-Green Constant Pressure Controls
Controller Display and Navigation
The controller consists of four buttons. Clear (C), OK,
Up (
ˆ
), and Down (
ˇ
). The display has two menus with
the following information displayed under each menu:
Display
Home
t 4UBUJD1SFTTVSFJO*ODIFTXH
-
This is the real-time duct pressure measured at
the tap. For all instances, -10 on the display refers
to -0.10 in. wg.
t 0VUQVU QFSDFOU
-
This displays the percent output of motor speed
from 20-100%.
Settings
t 4FUQPJOU JOXH
-
This is the pressure set point you want the system
to maintain. Again, -10 on the display refers to
-0.10 in. wg.
t $VUPVU7BMVF QFSDFOU
-
This value is a percentage of the motor output
from 0-100%. This is set as a threshold for turning
the fan off when no demand is present in the
system.
t %FMBZ TFDPOE
-
This value is the amount of time that will elapse
after there is no demand on the system before
shutting the fan off. This value has a minimum of
15 seconds.
Navigation
The home screen will be displayed by default. To reach
the settings screen, first press the Clear button, then
press OK. You are now in the settings screen. To modify
the values, arrow up or down to the value you intend to
change and press OK. Use the arrow buttons to adjust
the value, then press OK to accept your entry.
To return to the home screen, press the Clear button
twice. Note, the values on the home screen are read
only and cannot be changed.
Programming
After making all of the wiring connections and energizing
the controller, the system will begin to function with a
default set point of -0.10 in. wg.
There are some additional customization features that
can be utilized if deemed necessary and are listed
below.
Set Point
t /BWJHBUFUPUIFTFUUJOHTTDSFFOBOEFOUFSZPVS
desired set point. This will range from -0.40 in. wg
to +0.40 in. wg. Remember, -40 represents a static
pressure of -0.40 in. wg.
Cutout Value
The cutout feature can only be used if the system
utilizes powered fans such as bathroom fans or dryers.
It will not function properly if passive devices are
installed in the system such as motorized dampers.
This value 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 zero. If the exhaust fan is
required to operate at all times, leave this value at zero
and the programming is done.
When the output percent dips below this value, it
activates a timer and after the time has elapsed the fan
will shut off.
Note that this value is only valid for a discreet pressure
set point. When the set point is changed, the cutout
value must be adjusted as well. It is recommended
that you make sure your set point is correct before
continuing.
100%
0%
Value of output
when no demand
is on system
Cutout Value
should be
1-2 percentage
points higher
Output
Percent
Cutout
Value
To set this value, the following steps need to be
followed:
t &OFSHJ[FUIFTZTUFNBOEWFSJGZJUJTNBJOUBJOJOHUIF
desired pressure set point with no other equipment
(dryers, bathroom fans, etc.) operating.
t "GUFSUIFQSFTTVSFIBTTUBCJMJ[FEBUUIFTFUQPJOU
navigate to the output screen on the home menu of
the controller. Take note of this value. (The value will
nVDUVBUFTMJHIUMZXJUIJO "NFOUBMBWFSBHFXJMM
be adequate.)
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