Auto-Zone Control Systems Auto-Zone CV-C Controller Installation Guide (Version 01A) - Manual (Page 18)

Section 2 Auto-Zone CV-C
2-8 Sequence of Operation
Occupied/Unoccupied Occupied/Unoccupied Occupied/Unoccupied Occupied/Unoccupied
Mode of Operation
Mode of Operation Mode of Operation Mode of Operation
Since the CVC contains its own built in Real Time Clock, it can operate from its own
internal scheduling system. This schedule supports a two Start & Stop event per day and
up to 14 Start/Stop Day Holidays. The Holidays all use the same special Holiday
Start/Stop times programmed by the user.
If the current operating mode is unoccupied, the CVC can accept a push-button override
back to the occupied mode. Push-button overrides are not recognized if the current mode
is already occupied. The push-button override duration is user programmed. If the user
wants to extend the current override without reprogramming the Duration, they can re-
initialize the existing programmed period by pressing the override button anytime during
the current override. If the current override had been active for 1 hour and 45 minutes and
the user presses the push-button again, the override will reset for another 2 hour period (if
they programmed a 2 hour period), bringing the total override time to 3 hours and 45
minutes. If the user wants to cancel an override before it can time-out, simply hold the
push-button for a period of time between 3 and 10 seconds.
The CVC calculates its current heating and cooling setpoints based on the current mode
of operation. If the command is for unoccupied mode, the CVC adds the unoccupied
setbacks to the occupied heating and cooling setpoints.
Daylight Savings Daylight Savings Daylight Savings Daylight Savings
Adjustments
Adjustments Adjustments Adjustments
Since the CVC system usually contains a System Manager for keypad access to the Status
and Setpoints, the CVC controllers receive a Time Clock broadcast from the System
Manager which keeps all the CVC units synchronized. The System Manager also has the
ability to automatically adjust the time to take the Daylight Savings changes into account.
This is enabled at the System Manager so the effect is automatic at the CVC units. If the
user desires this feature, see Section 3 Setting the Time & Date.