Greenheck Vari-Green Control - Indoor Air Quality - VOC (I475407) - Manual (Page 7)

7
Wiring Diagram
Problem
Fan always at minimum speed  Place an opened permanent or white board marker underneath the controller. The
fan should increase speed within a few minutes.
 Check that the air quality measurement is decreasing. If there is a large
contamination it may take a while to exhaust the VOCs.
 Setpoint may be too low for persistent background VOCs.
 Check the space for a spill.
 Setpoint may be too low for persistent background VOCs.
 If the controller will not turn the fan off, verify that the measured %VOC is at least
2% below set point. Verify that the cutout timer has started by looking for the
flashing dot.
 If the controller will not restart the fan, verify that the measured %VOC is at least
5% above the setpoint.
Fan always at high speed
Fan Cutout not working properly
Potential Solution
Troubleshooting