N1 |
|
| EXH | TR | TR1 |
| N |
| Set |
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|
| 2V | 10V |
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| |
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| ||
P1 |
| EXH |
| 24 | 24 Vac |
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| Vac | COM | |
| P |
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| ||
|
| Min | HOT | _ | |
T1 |
|
| Pos | + | |
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|
T | Open |
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|
| DCV | 1 | 2 |
|
| Max | ||
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| |
| 2V | 10V |
|
|
AQ1 | DCV |
|
| 5 |
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| ||
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| |
AQ |
| DCV |
| 4 |
SO+ |
| Set | 3 | |
SO | 2V | 10V |
|
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|
| |
SR+ | Free |
| EF | EF1 |
| Cool |
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|
SR | B | C |
|
|
| A | D |
|
|
C06038
Fig. 50 - EonoMi$er IV Control
Indoor Air Quality (IAQ) Sensor Input
The IAQ input can be used for demand control ventilation control based on the level of CO2 measured in the space or return air duct.
Mount the accessory IAQ sensor according to manufacturer specifications. The IAQ sensor should be wired to the AQ and AQ1 terminals of the controller. Adjust the DCV potentiometers to correspond to the DCV voltage output of the indoor air quality sensor at the
CO2 SENSOR MAX RANGE SETTING
| 6000 |
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|
(ppm) | 5000 |
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| |
CONFIGURATION | 4000 |
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| 800 ppm |
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3000 |
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| 900 ppm | |
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| 1000 ppm | ||
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2000 |
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| 1100 ppm | |
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| ||
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RANGE | 1000 |
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| |
| 0 |
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|
| 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| DAMPER VOLTAGE FOR MAX VENTILATION RATE |
C06039
Fig. 51 - CO2 Sensor Maximum Range Settings
If a separate
When using demand ventilation, the minimum damper position represents the minimum ventilation position for VOC (volatile organic compounds) ventilation requirements. The maximum demand ventilation position is used for fully occupied ventilation.
When demand ventilation control is not being used, the minimum position potentiometer should be used to set the occupied ventilation position. The maximum demand ventilation position should be turned fully clockwise.
Exhaust Setpoint Adjustment
The exhaust setpoint will determine when the exhaust fan runs based on damper position (if accessory power exhaust is installed). The setpoint is modified with the Exhaust Fan Setpoint (EXH SET) potentiometer. (See Fig. 45.) The setpoint represents the damper position above which the exhaust fans will be turned on. When there is a call for exhaust, the EconoMi$er IV controller provides a 45 ± 15 second delay before exhaust fan activation to allow the dampers to open. This delay allows the damper to reach the appropriate position to avoid unnecessary fan overload.
Minimum Position Control
There is a minimum damper position potentiometer on the EconoMi$er IV controller. (See Fig. 45.) The minimum damper position maintains the minimum airflow into the building during the occupied period.
When using demand ventilation, the minimum damper position represents the minimum ventilation position for VOC (volatile organic compound) ventilation requirements. The maximum demand ventilation position is used for fully occupied ventilation.
When demand ventilation control is not being used, the minimum position potentiometer should be used to set the occupied ventilation position. The maximum demand ventilation position should be turned fully clockwise.
Adjust the minimum position potentiometer to allow the minimum amount of outdoor air, as required by local codes, to enter the building. Make minimum position adjustments with at least 10_F temperature difference between the outdoor and
To determine the minimum position setting, perform the following procedure:
1.Calculate the appropriate mixed air temperature using the following formula:
(TO x 100OA ) + (TR x 100RA ) =TM
TO =
OA = Percent of Outdoor Air
TR =
RA = Percent of Return Air
TM =
As an example, if local codes require 10% outdoor air during occupied conditions,
(60 x .10) + (75 x .90) = 73.5_F
2.Disconnect the supply air sensor from terminals T and T1.
3.Ensure that the
4.Connect 24 vac across terminals TR and TR1.
580J
39