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1.10.4.1. Set Point Control Option
Set point control mode is commonly used in areas with high
occupancy and frequent change out such as classrooms or
conference rooms.
In applications requiring this on/off damper response to
carbon dioxide
levels, set the start open (Parameter 118 -
DCV DAMP START OPEN) set point higher than the full
open (Parameter 119 - DCV DAMP FULL OPEN) set point.
The dampers will drive to fully-open position immediately.
Figure 41 shows the set point control option.
Change Parameters 122 and 123 to set the minimum
outdoor temperature limits. Change Parameters 120 and
121 to set the maximum temperature limits.
IMPORTANT
Mixed air temperatures less than 45°F (7°C) on units
with an aluminized heat exchanger or less than 30°F
(-1°C) on stainless steel heat exchangers will void the
manufacturer's warranty.
1.10.4.2. Determining Indoor Air Quality Inputs
Go to DATA> IN/OUTPUTS > SENSORS menu selection
from the M3 Unit Controller menu display.
Min. Position
100
Parameter 117
Parameter 119
(full)
Parameter 118
(start)
carbon dioxide (ppm)
Max. Open
Close Open
FIGURE 41
SET POINT CONTROL INDOOR AIR QUALITY OPTION
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