Greenheck Vari-Green Control - Constant Pressure/Air Flow Control (479653) - Manual (Page 7)

1 Initial Setup Menu Parameters
Parameter Name Values Default Description
Units Imperial, Metric Imperial Units used for settings within controller
Control Mode
Constant Pressure,
Constant Airflow
Constant pressure This sets the main function of the control.
Setpoint Location Local, Remote Local
Determines where the pressure or airflow setpoint will be set.
If local, set using the setpoints menu. If remote, connect a 0-10V signal to
remotely set the setpoint.
Min Pressure/Flow
Setpoint
Bottom end of pressure
transducer span
This value will correspond to the minimum voltage (0 or 2V) from the
remote setpoint signal. Only available when setpoint is set to [remote].
Max Pressure/Flow
Setpoint
Top end of pressure
transducer span
This value will correspond to a 10V signal from the remote setpoint signal.
Only available when setpoint is set to [remote].
Remote Setpoint
Voltage
0-10V, 2-10V 0-10V
Change this setting based on the signal for the remote setpoint. If 0-10V,
0V refers to the minimum setpoint. If 2-10V, 2V refers to the minimum
setpoint. Only available when setpoint is set to [remote].
Fan Inlet/Outlet Inlet, Outlet Inlet
Set this parameter to match where the pressure probe is located in relation
to the fan the control is controlling. Only available in [pressure] mode.
Duct Area
0-100 sq. ft
(0-9.29 sq. m)
4 sq ft
(0.37 sq. m)
Input the area of the duct where the pitot tube is located. If using an AMS,
input the area from the AMS label. Only available in [airflow] mode.
Measurement Device Pitot Tube, AMS Pitot Tube
Select the measurement probe type being used. Only available in [airflow]
mode.
AMS “K” value
When AMS is used, set to “K” value on AMS label.
Only available in [airflow] mode.
AMS “m” value
When AMS is used, set to “m” value on AMS label.
Only available in [airflow] mode.
Pitot Correction
Factor
0.50 to 2.00 1.00
Corrects the airflow measurement for the airflow device being used.
Adjust the value if using a pitot tube by others. Only available in [airflow]
mode.
Air Density Correction
Factor
0-5.00 1.00
Adjust this value to match the density of the air flowing through the
system. Select the value from the table on pg. 11.
Only available in [airflow] mode
Max Flow Output
0-100,000 CFM
0-m 3 /hr 169,901
500 CFM
8495 m 3 /hr
Sets the top of the span for the reference output in [airflow] mode. Adjust
this setting to give more resolution to the remote airflow reading.
Pressure/Airflow
Output
0-10V, 2-10V 0-10V This sets the span of the reference output.
Remote Sensor Min
Pressure
-1.00 in. WC (-249Pa)
Set this value to the minimum pressure value of the remote pressure
transducer. Only available with remote pressure transducer model.
Remote Sensor Max
Pressure
1.00 in. WC (249Pa)
Set this value to the minimum pressure value of the remote pressure
transducer. Only available with remote pressure transducer model.
Control output 0-10V, 2-10V 0-10V
This value will change the span of the control output.
Vari-Green motors use 0-10V.
Startup Timer 1-30 Seconds 3 Seconds
The control output will be set to the minimum value at startup for this
amount of time.
Sensor Filter 0-10 Seconds 0
Adjust this value if the pressure reading is unstable.
Increasing the value increases the stability of the pressure reading.
Response Time
Fast, Medium,
Slow
Fast
This value adjusts the response time of the controller.
Set to Medium or Slow if the fan is unstable/oscillating.
Constant Pressure Control 7