Auto-Zone Control Systems Auto-Zone CV-C Controller Installation Guide (Version 01A) - Manual (Page 28)

Section 2 Auto-Zone CV-C
2-18 Sequence of Operation
Hot Water Valve Hot Water Valve Hot Water Valve Hot Water Valve
Operation
Operation Operation Operation
If the user has configured the CVC with the Hot Water Valve option, the following
sequence of operation occurs during a cooling demand.
If the controller was configured for De-Humidification, then any statements concerning
the cooling being off before the heat can activate can be ignored as the cooling is used in
conjunction with the heat to reduce humidity and maintain space temperature.
Once a heating demand exists (see HVAC Mode of Operation), the following conditions
must be met before the valve modulation signal is activated.
a. Make sure any stages of cooling are staged off or the chilled water valve is
closed.
b. Make sure the Changeover Delay is satisfied. This only applies if the
previous demand was for cooling.
c. Check the Outdoor Air Temperature to verify the cooling is enabled to run
due to warm temperatures.
d. If you have Economizer control, the Economizer must be at its minimum
ventilation position.
Heating can modulate closed if the following conditions are true.
a. A heating demand equal to the Heating Setpoint plus half the Deadband has
occurred in the space.
b. If the heating mode is enabled by outside air, then the valve modulates to
maintain a supply temperature, defined by the user, until the demand rises
above the cooling setpoint by the same amount it rose above it to start the
demand.
c. Once the heating demand has been satisfied, the valve will go fully closed
until the next heating demand.