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Appendix A: VVT Zone Controller Points/Properties
Point Name/Description
Hysteresis
– The desired difference between the temperature at which the zone color
changes as the zone temperature departs from the acceptable range between the
heating and cooling setpoints (green) into the Cooling 1 (yellow) or Heating 1 (light
blue) and the temperature at which the zone color changes back to the acceptable
range between the heating and cooling setpoints.
For example, the following graph shows the zone color that results as the zone
temperature departs from and returns to the acceptable range in a zone with the
following settings:
•
Color Change Hysteresis = .5° (applies as the temperature returns to the
acceptable range)
•
Occupied cooling setpoint = 76°
•
Occupied heating setpoint = 70°
Occupied cooling setpoint: 76°
75.5°
70.5°
Occupied heating setpoint: 70°
Learning Adaptive Optimal Start – This function gradually adjusts the unoccupied setpoints over a specified period of time
to achieve the occupied setpoint by the time scheduled occupancy begins. This learning adaptive algorithm uses the learned
heating capacity and learned cooling capacity values to calculate the effective setpoints prior to the occupied start time.
The algorithm calculates a learned cooling and heating capacity during the previous unoccupied time. Set the Learning
Adaptive Optimal Start recovery period from 1 to 4 hours in Optimal Start. When the Learning Adaptive Optimal Start
routine runs, adjustments are based on the color that is achieved when occupancy begins. Adjustment amounts are defined
in the thermographic color fields located directly above the Effective Set Points graph under Setpoints .
Effective Setpoints
The Effective Setpoints graph shows the current occupied or unoccupied setpoints. If occupied, these values are the current
programmed setpoints plus the offset of any setpoint adjustment that may be in affect. If unoccupied, the values are the
programmed unoccupied setpoints.
Point Name/Description
Heating – (Occupied or Unoccupied, depending on mode) The current programmed Heating
setpoint adjusted by any offset that may be in effect.
56
Temp
.5° hysteresis
.5° hysteresis
Time
Range
D:
0.5°F
R:
0.2 to 1.0°F
Default/Range
R:
0 to 120°F
VVT Zone Controller
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