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507232-04 7/2017
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FIGURE 37
ENTHALPY SENSOR OUTPUT CURRENT HONEYWELL C7400
1.6. 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)
1.7. Minimum Damper Position
Use the following menu path to modify 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 = .%
Units Equipped With An Energy Recovery Wheel
The economizer minimum damper position must be
adjusted to allow for the air resistance of the ERW.
1- Determine the required outdoor air CFM.
2- Apply the CFM to table 20 to determine the target static
pressure drop across the ERW.
3- Measure the static pressure drop across the ERW. See
figure 38.
4- Adjust the minimum % open damper position (see
previous section).
5- Read the static pressure drop across the ERW and
adjust the minimum % open damper position as needed
to reach the target pressure drop.
For example, a unit with an outdoor air flow of 6500 CFM
would require an ERW pressure drop of 0.90”w.c.
1.8. Motorized Outdoor Air Damper
Set damper position according to “Minimum Damper
Position” section 1.7. 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.
TABLE 20
ERW PRESSURE DROP
Outdoor Flow - cfm Static Pressure - in. w.c.
3250 0.45
3500 0.48
3750 0.52
4000 0.55
4250 0.59
4500 0.62
4750 0.66
5000 0.69
5250 0.73
5500 0.76
5750 0.80
6000 0.83
6250 0.87
6500 0.90
6750 0.94
7000 0.97
7250 1.01
7500 1.04
7750 1.08
8000 1.11
8250 1.15
8500 1.18
8750 1.22
9000 1.25
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