CO2 SENSOR MAX RANGE SETTING
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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. 64 - 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. 58.) 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. 58.) 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.
5.Carefully adjust the minimum position potentiometer until the measured mixed air temperature matches the calculated value.
6.Reconnect the supply air sensor to terminals T and T1.
Remote control of the EconoMi$er IV damper is desirable when requiring additional temporary ventilation. If a
To control the minimum damper position remotely, remove the
Damper Movement
Damper movement from full open to full closed (or vice versa) takes 21/2 minutes.
Thermostats
The EconoMi$er IV control works with conventional thermostats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The EconoMi$er IV control does not support space temperature sensors. Connections are made at the thermostat terminal connection board located in the main control box.
Occupancy Control
The factory default configuration for the EconoMi$er IV control is occupied mode. Occupied status is provided by the black jumper from terminal TR to terminal N. When unoccupied mode is desired, install a
50TC
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