48TC
N1 |
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| EXH | TR | TR1 |
| N |
| Set |
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| 2V | 10V |
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P1 |
| EXH |
| 24 | 24 Vac |
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| Vac | COM | |
| P |
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| Min | HOT | _ | |
T1 |
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| Pos | + | |
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T | Open |
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| DCV | 1 | 2 |
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| Max | ||
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| 2V | 10V |
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AQ1 | DCV |
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| 5 |
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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 |
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| A | D |
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C06038
Fig. 82 - EconoMi$er IV Control
Differential Enthalpy Control
For differential enthalpy control, the EconoMi$er IV controller uses two enthalpy sensors (HH57AC078 and CRENTDIF004A00), one in the outside air and one in the return air duct. The EconoMi$er IV controller compares the outdoor air enthalpy to the return air enthalpy to determine EconoMi$er IV use. The controller selects the lower enthalpy air (return or outdoor) for cooling. For example, when the outdoor air has a lower enthalpy than the return air, the EconoMi$er IV opens to bring in outdoor air for free cooling.
Replace the standard outside air dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. (See Fig. 71.) Mount the return air enthalpy sensor in the return air duct. (See Fig. 80.) Wiring is provided in the EconoMi$er IV wiring harness. (See Fig. 73.) The outdoor enthalpy changeover setpoint is set with the outdoor enthalpy setpoint potentiometer on the EconoMi$er IV controller. When using this mode of changeover control, turn the enthalpy setpoint potentiometer fully clockwise to the D setting.
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.
There is both a
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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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. 83 - 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. 77.) 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. 77.) 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.
62
