Carrier Infinity SYSTXCCITC-01SI Installation Instructions Manual page 33

A duct assessment will automatically occur each day at a user selectable time. The
factory default time is 1:00 p.m. but, may be changed by entering the Zoning Setup
menu. If there is an active call for heating or cooling, the system will wait until the
call is satisfied before it performs the duct assessment. The system will first open all
zones and drive the blower to 175 CFM/ton of cooling (or the minimum indoor
unit's airflow, whichever is greater). It will then take a static pressure measurement.
The system will then close all zones and open one zone at a time, taking a static
pressure measurement for each zone.
The system will then close all zones and take a pressure measurement, getting a
value for the duct leakage up to and through the dampers. With these static pressure
measurements, the system will calculate the relative size of each zone as well as the
percent leakage through the dampers At the end of the process, the display will
show the relative size of each zone duct.
If the Infinity System Control detects an error (damper not moving or damper wired
backwards), it will perform the duct assessment again. If it still detects a damper
problem, it will default the measurements into equal sizes, with 10% leakage, and
display the zone number for the suspected zone damper.
NOTE: The daily duct assessment will occur even if static pressure monitoring is
disabled. This is done to ensure that the system will continue to provide proper
airflow for all installed equipment, since duct system changes may occur at any
time, such as opened or closed registers.
After the duct assessment is complete, touch NEXT.
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