74-2958— 1
74
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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MaxHtRamp | nciAux1SetPt | ubMaxHtRampS0 | Degrees F/Hr |
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| 8 | P |
| X | X |
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| MaxHtRamp is the maximum heat recovery ramp rate in degrees F |
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| 0 to 20 |
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| per hour. This value is used to control the adaptive recovery ramp |
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| Degrees C/Hr |
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| rate during the HEAT recovery period. The setpoint is changed at a |
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| (0 to 11) |
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| rate in degrees F per hour depending on the outdoor air temperature |
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| and the MinHtRamp, OdTempMaxHtRamp, and OaTempMinHtRamp |
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| parameters. If there is no outdoor air temperature sensor available, |
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| then ubMinHtRamp is used as the recovery rate.NOTE: Recovery |
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| ramping applies between scheduled heating or cooling setpoint |
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| changes from OC_UNOCCUPIED to OC_STANDBY, |
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| OC_UNOCCUPIED to OC_OCCUPIED, and OC_STANDBY to |
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| OC_OCCUPIED. Scheduled setpoint changes from OC_OCCUPIED |
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| to OC_UNOCCUPIED or OC_OCCUPIED to OC_STANDBY do not |
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| use a ramped setpoint but instead use a step change in setpoint. |
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| Recovery ramps begin before the next scheduled occupancy time |
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| and are ramped from the setpoint for the existing scheduled |
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| occupancy state to the setpoint for the next occupancy state. |
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MinHtRamp | nciAux1SetPt | ubMinHtRampS0 | Degrees F/Hr |
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| 3 | P |
| X | X |
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| MinHtRamp is the minimum heat recovery ramp rate in degrees F |
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| 0 to 20 |
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| per hour. This value is used to control the adaptive recovery ramp |
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| Degrees C/Hr |
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| rate during the HEAT recovery period. The setpoint is changed at a |
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| (0 to 11) |
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| rate in degrees F per hour depending on the outdoor air temperature |
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| and the MaxHtRamp, OdTempMaxHtRamp, and |
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| OdTempMinHtRamp parameters. If there is no outdoor air |
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| temperature sensor available, then MinHtRamp is used as the |
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| recovery rate. Refer to the NOTE in the comments column for |
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| MaxHtRamp for the conditions that recovery ramping applies to. |
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OaTempMaxHtRp | nciAux1SetPt | ubOdTempMaxHtRampS0 | Degrees F |
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| 40 | P |
| X | X |
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| OdTempMaxHtRamp is the maximum outdoor air temperature |
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| 0 to 100 |
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| parameter that is used to calculate the heat recovery ramp rate |
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| Degrees C |
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| setpoint. This value is used to control the adaptive recovery ramp |
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| rate during the HEAT recovery period. The setpoint is changed at a | |
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| rate in degrees F per hour depending on the outdoor air temperature |
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| and the MaxHtRamp, MinHtRamp, and OdTempMinHtRamp |
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| parameters. If there is no outdoor air temperature sensor available, |
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| then MinHtRamp is used as the recovery rate. Refer to the NOTE in |
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| the comments column for MaxHtRamp for what conditions that |
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| recovery ramping applies to. |
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OaTempMinHtRp | nciAux1SetPt | ubOdTempMinHtRampS0 | Degrees F |
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| 0 | P |
| X | X |
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| OdTempMinHtRamp is the minimum outdoor air temperature |
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| 0 to 100 |
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| parameter that is used to calculate the heat recovery ramp rate |
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| Degrees C |
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| setpoint. This value is used to control the adaptive recovery ramp |
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| rate during the HEAT recovery period. The setpoint is changed at a | |
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| rate in degrees F per hour depending on the outdoor air temperature |
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| and the MaxHtRamp, MinHtRamp, and OdTempMaxHtRamp |
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| parameters. If there is no outdoor air temperature sensor available, |
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| then MinHtRamp is used as the recovery rate. Refer to the NOTE in |
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| the comments column for MaxHtRamp for what conditions that |
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| recovery ramping applies to. |
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OaTempClLkOut | nciAux1SetPt | ubOdClLockOutTempS0 | Degrees F | Degrees C |
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| 50 | P |
| X | X |
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| When the outdoor air temperature is less than OdClLockOutTemp, |
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| 0 to 90 |
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| the cooling is disabled. |
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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER