21
CONTROLS
Sequence of Operation
The packaged air conditioner is designed for installation with a
communicating User Interface. This unit will not respond to
commands provided by a common thermostat except under certain
emergency situations.
The User Interface uses temperature, humidity and other data
supplied from indoor and outdoor system components to control
heating or cooling system for optimum comfort. The unit will be
commanded by User Interface to supply airflow. The unit will
operate the indoor blower at requested airflow for most modes.
The nominal requested airflow will be 350 cfm per ton of nominal
cooling capacity as defined by unit size. Actual airflow request will
be adjusted from nominal using indoor and outdoor temperature
and indoor humidity data to optimize the system operation for
occupant comfort and system efficiency. Refer to User Interface
literature for further system control details.
Airflow during electric heater operation must be greater than a
minimum level for safe operation. If User Interface instructs unit to
turn on electric heat and the requested airflow is less than the
minimum level the unit control will override requested value.
NOTE
: Once the compressor has started and then has stopped, it
should not be started again until 4 minutes have elapsed. The
cooling cycle remains “on” until the room temperature drops to
point that is slightly below the cooling control setting of the user
interface.
704C
