Installation Manual

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 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.

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.