When using some Compact HVAC options you may need to specify a zone to be the control zone, i.e. the conditions in this single zone will be used to decide the operation of the HVAC system as a whole. The control zone checkboxes are only visible at zone level and for certain system types.
Check this if the current zone provides the conditions used to control the operation of the Unitary multizone system.
The zone to be used to control humidification in Compact VAV, CAV and Unitary multizone systems.
The zone to be used to control dehumidification in Compact VAV, CAV and Unitary multizone systems.
Note: Thehumidification and dehumidification zones cannot be the same
The zone to be used to control the operation of the change over mixed mode system.