Auto-Zone Control Systems Auto-Zone CV-C Controller Installation Guide (Version 01A) - Manual (Page 19)

Auto-Zone CV-C Section 2
Sequence of Operation 2-9
Off Mode of Operation Off Mode of Operation Off Mode of Operation Off Mode of Operation
After the schedule goes unoccupied and both heating and cooling demands go away, the
fan stops running, all Relay Outputs are turned off and Analog Output Voltages go to 0.0
vdc. No outputs are allowed to activate in the Off Mode until a heating or cooling
demand occurs. During occupied hours this would be the Vent Mode.
Vent Mode Operation Vent Mode Operation Vent Mode Operation Vent Mode Operation
During occupied hours when there is no heating or cooling demand, the CVC reverts to a
Vent Mode of operation. The fan is running and the heating and cooling outputs are held
off.
See the section titled HVAC Mode of Operation for a graphical representation of how
the Vent Mode is calculated.
Fan Only Mode Operation Fan Only Mode Operation Fan Only Mode Operation Fan Only Mode Operation
If the user would like to circulate air around the space without causing the heating or
cooling to activate, they can select the Fan Only mode. In this mode all other control
outputs are turned off. All normal scheduled operation is suspended until the Fan Only
mode is canceled. Fan Only mode can be set or cleared from the System Manager or
from the ZoneView front end program on systems equipped for remote communications.