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8.6.
Enthalpy Set Point
This setting pertains to the single enthalpy free cooling mode only. The M3 unit controller will enable free cooling when
outdoor air enthalpy (A7) is less than the enthalpy set point (parameter 162 - ECON FREECL ENTH SP). Figure 8 shows
the approximate enthalpy sensor output at various temperatures and percentage of relative humidity.
8.7.
Free Cooling Damper Maximum Position
Damper Maximum position for free cooling is by default set to 100%. To modify this settings, use the following path:
SETTINGS > RTU OPTION > EDIT PARAMETER - 131 (FREE CL MAX DAMPER)
8.8.
Minimum Damper Position
Use the following menu path to modified the minimum damper positions for both high and low operations.
SETUP > TEST & BALANCE > DAMPER > MIN DAMPER POSITION BLOWER ON HIGH = .%
SETUP > TEST & BALANCE > DAMPER > MIN DAMPER POSITION BLOWER ON LOW = .%
8.9.
Closing Damper and Calibration
Use the following menu path to close the damper and confirm whether the M3 unit controller has calibrated the damper
position feed back to be used later on.
Go to SETUP > TEST & BALANCE > DAMPER > DAMPER FDBK CALIB IS DAMPER CLOSED? = NO or YES
The Installer should visually inspect the damper to ensure that it is closed. If the installer confirms that the damper is
indeed closed.
8.10. Motorized Outdoor Air Damper
Set damper position according to "Minimum Damper Position" section 8.8. For normal operation, make sure the
motorized outdoor air damper is set correctly in Configuration ID 1, position 2 needs to be set to M. The damper will open
to the specified position during the occupied time period and close during the unoccupied time period.
NOTE: When equipped with Motorized Outdoor damper Air Damper, Prodigy 2.0 provides only Demand Control
Ventilation. Free Cooling/Economizer function is not available.
100
90
80
70
60
50
40
30
20
10
40°F
50°F
Figure 8. Enthalpy Sensor Output Current Honeywell C7400
60°F
70°F
80°F
90°F
46
100°F
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