50TC
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| 85 | 90 | 95 | 100 | 105 | 110 | ||
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| (29) | (32) | (35) | (38) | (41) | (43) | ||
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CONTROL | CONTROL POINT |
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| 4 | 4 |
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CURVE APPROX. deg. F (deg. C) |
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| AT 50% RH |
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A |
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| 73 (23) |
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| AIR |
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| (27) |
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| 40 |
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B |
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| 70 (21) |
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| DRY |
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C |
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| HUMIDITY |
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D |
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| 36 |
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| PER |
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| 3 | 4 |
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| (2) |
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| APPROXIMATE DRY BULB |
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C06037
Fig. 62 - Enthalpy Changeover Setpoints
N1 |
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P1 |
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T1 |
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T | Open |
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AQ1 | DCV |
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AQ |
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SO+ |
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SO | 2V | 10V |
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C06038
Fig. 63 - EonoMi$er IV Control
Differential Enthalpy Control
For differential enthalpy control, the EconoMi$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$er IV opens to bring in outdoor air for free cooling.
Replace the standard outside air dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. (See Fig. 52.) Mount the return air enthalpy sensor in the return air duct. (See Fig. 61.) Wiring is provided in the EconoMi$er IV wiring harness. (See Fig. 52.) 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.
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
36