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Damper Minimum Position Adjustments
Units Equipped With M2 and M3 Unit Controllers
The damper minimum position or positions are
adjusted using the Unit Controller input screen. For a
unit equipped with more than 1 blower speed, the unit
should initially be run on highest speed.
1- Field-Installed Dampers Only -
Use one of the following menus to enable the
motorized damper function on the Unit Controller.
M3 Unit Controller -
SETUP > INSTALL
Navigate
through
the
CONFIGURATION ID 1 appears. Enable set position 2 to
M (motorized outdoor air damper only).
M2 Unit Controller -
SETTINGS > INSTALL > NEW M2 > DAMPER > MOAD
2- Use one of the following menu paths to set the
minimum damper position.
M3 Unit Controller -
SETUP > TEST & BALANCE > DAMPER > MIN
DAMPER POSITION BLOWER ON HIGH=.%
M2 Unit Controller -
SETTINGS > SETPOINTS > DAMPER > MIN OCP
BLOWER HIGH
3- Use the Determine Outdoor Air Percentage section to
verify the minimum damper air percentage.
4- Units Equipped With Two Blower Speeds -
Use one of the following menu paths to set the low
speed minimum damper position.
M3 Unit Controller -
SETUP > TEST & BALANCE > DAMPER > MIN
DAMPER POSITION BLOWER ON LOW=.%
M2 Unit Controller -
SETTINGS > SETPOINTS > DAMPER > MIN OCP
BLOWER LOW
5- Use the Determine Outdoor Air Percentage section to
verify the low speed minimum damper air
percentage.
Note - For additional details, refer to Unit Controller
manual shipped with unit.
various
screens
until
Units Not Equipped With A Unit Controller
The damper motor stop is preset to provide 100%
outdoor air and is adjustable in fixed increments. For
units supporting more than 1 blower speed, the
damper minimum set point should be determined with
the blower operating at the highest speed.
1- To reduce the outdoor air percentage, remove
retainer clip and adjust damper stop in the clockwise
direction. Replace the retainer clip securing the stop
arm in the new position. See figure 4.
2- Power the damper open by providing a blower and
occupied demand to the unit thermostat connections.
3- Use the Determine Outdoor Air Percentage section to
verify the minimum damper air percentage.
4- Repeat steps 1 through 3 until calculation reads
desired outdoor air percentage. Remove the
blower and occupied demand signals before
adjusting damper stop.
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