Carrier VAV Zone II Installation And Startup Manual page 80

Appendix A: VAV Zone II Points/Properties
Point Name/Description
Cooling Design Temp – The geographically-based outdoor air temperature at which the
cooling system must run constantly to maintain comfort. This information is available in
ASHRAE publications and most design references.
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 °F (.27 °C) (applies as the temperature returns to
the acceptable range)

Occupied cooling setpoint = 76°F (24.4°C)

Occupied heating setpoint = 70°F (21.1°C)
NOTE The values in the graph below are Fahrenheit.
Occupied cooling setpoint: 76°
75.5°
70.5°
Occupied heating setpoint: 70°
Learning Adaptive Optimal Start
When the Learning Adaptive Optimal Start algorithm runs, the learned heating capacity or learned cooling capacity values
are adjusted based on the color that is achieved when occupancy begins. The adjustment amounts for each color are
displayed in the thermographic color fields (shown above with English default values).
Point Name/Description
Red – The amount the zone's learned heating capacity is adjusted when the Learning
Adaptive Optimal Start algorithm runs, when the zone's thermographic color at
occupancy is red.
VAV Zone II Controllers
Installation and Start-up Guide
Temp
.5° hysteresis
.5° hysteresis
Time
76
Default/Range
D: 100°F (37.7°C)
R: -100 to 150°F
(-73.3 to 65.5°C)
D: .5 °F ( .27 °C)
R: 0.2 to 1.0 °F
(.1 to .5 °C)
Range
English Metric
D: 0.1900 .1055
R: 0 to 1
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