Auto-Zone Control Systems Auto-Zone CV-C Controller Installation Guide (Version 01A) - Manual (Page 33)

Auto-Zone CV-C Section 2
Sequence of Operation 2-23
Indoor Air Quality Indoor Air Quality Indoor Air Quality Indoor Air Quality
If you have configured an Analog Input to read a CO² sensor or to receive the broadcast
of CO² from another unit, this CVC can override the minimum economizer position to
bring in more fresh outside air to relieve the condition.
As the CO² level rises above the user adjustable CO² Setpoint, the Minimum Economizer
position switches over to a user adjustable value of up to 100% and makes sure the
economizer does not close any further than this new value. If the value is less than 100%
and the economizer is opening to control supply or mixed air, the economizer is still free
to modulate between 100% and this new minimum position. The only condition that will
override the minimum is supply air dropping below the 40°F or 4.4°C protection limit.
As the CO² level drops below the CO² Setpoint by the user adjustable Deadband value,
the original Economizer Minimum Position is restored and the economizer is now free to
modulate over its entire range again, or return to minimum if cooling is not required.
Scheduled Relays Scheduled Relays Scheduled Relays Scheduled Relays
If you define one of the Output Relays to follow the Internal Schedule, then whenever the
Schedule is Occupied the relay will activate. Whenever the schedule goes Unoccupied the
relay de-activates. Push-button overrides will not re-activate this relay. Only the
Occupied mode will activate the relay. Only one relay should be assigned to follow an
external schedule.
If you define one of the Output Relays to follow an External Schedule then the same
conditions apply. That relay will follow the broadcast receipt of the selected schedule.
Only one relay should be assigned to follow an external schedule since there is only one
Schedule Setpoint available. If you assigned more than one relay, they would all follow
the same schedule.
The External Schedule can only be received from an Auto-Zone Optimal Start Scheduler
installed on one of the communications loops in your building. These options require the
ZoneView AZ computer program for programming and monitoring.