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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—174
MaxHtRamp nciAux1SetPt ubMaxHtRampS0 Degrees F/Hr
0 to 20
Degrees C/Hr
(0 to 11)
8 P X X MaxHtRamp is the maximum heat recovery ramp rate in degrees F
per hour. This value is used to control the adaptive recovery ramp
rate during the HEAT recovery period. The setpoint is changed at a
rate in degrees F per hour depending on the outdoor air temperature
and the MinHtRamp, OdTempMaxHtRamp, and OaTempMinHtRamp
parameters. If there is no outdoor air temperature sensor available,
then ubMinHtRamp is used as the recovery rate.NOTE: Recovery
ramping applies between scheduled heating or cooling setpoint
changes from OC_UNOCCUPIED to OC_STANDBY,
OC_UNOCCUPIED to OC_OCCUPIED, and OC_STANDBY to
OC_OCCUPIED. Scheduled setpoint changes from OC_OCCUPIED
to OC_UNOCCUPIED or OC_OCCUPIED to OC_STANDBY do not
use a ramped setpoint but instead use a step change in setpoint.
Recovery ramps begin before the next scheduled occupancy time
and are ramped from the setpoint for the existing scheduled
occupancy state to the setpoint for the next occupancy state.
MinHtRamp nciAux1SetPt ubMinHtRampS0 Degrees F/Hr
0 to 20
Degrees C/Hr
(0 to 11)
3 P X X MinHtRamp is the minimum heat recovery ramp rate in degrees F
per hour. This value is used to control the adaptive recovery ramp
rate during the HEAT recovery period. The setpoint is changed at a
rate in degrees F per hour depending on the outdoor air temperature
and the MaxHtRamp, OdTempMaxHtRamp, and
OdTempMinHtRamp parameters. If there is no outdoor air
temperature sensor available, then MinHtRamp is used as the
recovery rate. Refer to the NOTE in the comments column for
MaxHtRamp for the conditions that recovery ramping applies to.
OaTempMaxHtRp nciAux1SetPt ubOdTempMaxHtRampS0 Degrees F
0 to 100
Degrees C
(-18 to 38)
40 P X X OdTempMaxHtRamp is the maximum outdoor air temperature
parameter that is used to calculate the heat recovery ramp rate
setpoint. This value is used to control the adaptive recovery ramp
rate during the HEAT recovery period. The setpoint is changed at a
rate in degrees F per hour depending on the outdoor air temperature
and the MaxHtRamp, MinHtRamp, and OdTempMinHtRamp
parameters. If there is no outdoor air temperature sensor available,
then MinHtRamp is used as the recovery rate. Refer to the NOTE in
the comments column for MaxHtRamp for what conditions that
recovery ramping applies to.
OaTempMinHtRp nciAux1SetPt ubOdTempMinHtRampS0 Degrees F
0 to 100
Degrees C
(-18 to 38)
0 P X X OdTempMinHtRamp is the minimum outdoor air temperature
parameter that is used to calculate the heat recovery ramp rate
setpoint. This value is used to control the adaptive recovery ramp
rate during the HEAT recovery period. The setpoint is changed at a
rate in degrees F per hour depending on the outdoor air temperature
and the MaxHtRamp, MinHtRamp, and OdTempMaxHtRamp
parameters. If there is no outdoor air temperature sensor available,
then MinHtRamp is used as the recovery rate. Refer to the NOTE in
the comments column for MaxHtRamp for what conditions that
recovery ramping applies to.
OaTempClLkOut nciAux1SetPt ubOdClLockOutTempS0 Degrees F Degrees C
0 to 90 (-18 to 32)
50 P X X When the outdoor air temperature is less than OdClLockOutTemp,
the cooling is disabled.
Table 21. Control Parameters. (Continued)
User Address NvName Field Name
Engineering Units: English
(Metric) or States plus Range
Digital State or
Value of State
Default
E-Vision (M, P, S)
Share
Map
Direct Access
Hardware Config.
Manual Config.
Test
E-Vision Legend: (M) Monitor, (P) Parameter, (S) Schematic
Comments