74-2958— 1
76
Table 21. Control Parameters. (Continued)
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| Value | Digital |
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| Direct | Hardware | Manual |
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User Address | NvName | Field Name | (Metric) or States plus Range | ofState | Stateor | Default | (M, P,S) | Share | Map | Access | Config. | Config. | Test | Comments |
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| Engineering Units: English |
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OaEnthEn | nciAux1SetPt | ubOdEnthalpyEnableS2 | btu/lb |
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| 25 | P |
| X | X |
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| If Config.EconEnable is SINGLE_ENTH, and calculated outdoor |
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| 0 to 65 |
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| enthalpy is less than OdEnthalpyEnable, and outdoor temperature is |
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| less than OdEconEnableTemp, then outdoor air is judged suitable to |
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| augment mechanical cooling. |
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EconMinPos | nciAux1SetPt | ubEconMinPosS0 | Percentage |
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| 0 | P |
| X | X |
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| The minimum allowed position of the economizer damper for HEAT |
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| 0 to 100 |
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| and COOL is EconMinPos. |
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EconIAQPos | nciAux1SetPt | ubEconIaqPosS0 | Percentage |
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| 80 | P |
| X | X |
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| The control overrides the economizer damper to EconIaqPos when |
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| 0 to 100 |
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| poor indoor air quality is detected. |
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IAQSetpt | nciAux1SetPt | siCO2IaqLimitS0 | PPM |
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| 800 | P |
| X | X |
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| When an analog CO2 sensor is configured and the sensed CO2 is |
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| 0 to 2000 |
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| greater than CO2IaqLimit, then poor indoor air quality is detected |
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| and Data1.OverRide is set to 1. When the sensed CO2 is less than |
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| CO2IaqLimit, then the indoor air quality is considered acceptable |
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| and Data1.IaqOverRide is set to 0. oData1.IaqOverRide is used to |
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| set the economizer damper to Aux1SetPt. EconIaqPos and to |
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| possibly turn on the heat according to the state of |
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| Config.IaqUseHeat. |
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PwmPeriod | nciAux1SetPt | siPwmPeriodS4 |
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| 100 | P |
| X | X |
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| When pulse width modulation is used, the period of one pulse width |
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| modulation cycle is PwmPeriod seconds. The smallest resolution is |
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| 0.1 seconds. |
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PwmZeroScale | nciAux1SetPt | siPwm0pcntS4 | Seconds |
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| 1 | P |
| X | X |
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| When pulse width modulation is used, the period of a pulse for zero |
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| 0 to 2047 |
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| percent output (damper or valve at open position) is Pwm0pcntS4 |
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| seconds. The smallest resolution is 0.1 seconds. |
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PwmFullScale | nciAux1SetPt | siPwm100pcntS4 | Seconds |
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| 99 | P |
| X | X |
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| When pulse width modulation is used, the period of a pulse for full |
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| 0 to 2047 |
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| scale output (damper or valve at open position) is Pwm100pcnt |
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| seconds. The smallest resolution is 0.1 seconds. |
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BypTime | nciAux2SetPt | uiBypassTime | minutes |
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| 180 | P |
| X | X |
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| uiBypassTime is the time between the pressing of the override |
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| 0 to 1080 |
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| button at the wall module (or initiating OC_BYPASS via ManOcc) |
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| and the return to the original occupancy state. When the bypass |
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| state has been activated, the bypass timer is set to BypassTime. |
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FltrPressStPt | nciAux2SetPt | ubFilterPressStPtS5 | inw (kPa) |
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| 0.5 | P |
| X | X |
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| If a filter pressure sensor is configured by IoSelect and the filter |
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| 0 to 5 (0 to 1.25) |
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| pressure reported in Data1 FilterPressure exceeds FilterPressStPt, |
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| then a DIRTY_FILTER alarm is generated and Data1.DirtyFilter is |
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| set to 1. |
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StptKnobLowLim | nciAux2SetPt | siLowStPtS7 | Degrees F |
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| 55 | P |
| X | X |
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| LowStPt is the lowest value reported for the setpoint knob. |
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| Dependent on the configuration of the setpoint knob (see | |
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| Degrees C |
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| Config.SetPntKnob) this setting is either absolute [degree |
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| Fahrenheit (50 to 90)] in case of absolute setpoint knob configuration |
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| or relative [delta degree Fahrenheit |
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| setpoint knob configuration. |
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StptKnobHiLim | nciAux2SetPt | siHighStPtS7 | Degrees F |
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| 85 | P |
| X | X |
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| HighStPt is the highest value reported for the setpoint knob. |
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| Dependent on the configuration of the setpoint knob (see | |
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| Degrees C |
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| Config.SetPntKnob) this setting is either absolute [degree |
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| Fahrenheit (50 to 90)] in case of absolute setpoint knob configuration |
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| or relative [delta degree Fahrenheit |
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| setpoint knob configuration. |
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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER