Duct Assessment (Zoning Applications Only) - Bryant Evolution Connex SYSTXBBECW01 Installation Instructions Manual

5.11.

Duct Assessment (zoning applications only)

The duct assessment screen will be displayed next for zoning applications. Touch
NEXT to start Duct Assessment. Duct Assessment will measure the relative size of
the ductwork, up to and through the dampers. These measurements are used to
control the correct amount of airflow in the zoned system. Status messages will
appear on the screen to indicate what the system is doing. The process will take
approximately one minute per zone. The duct assessment will override a call for
heat or cool.
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 (see pages 36 - - 37). 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 Evolution Connex 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.
After the duct assessment is complete, touch NEXT.
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