AP Expert VT-110, User Manual

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Chapter 9: Ventilation and Cooling
Setting the Start and Stop Temperatures of a Fan Stage
What You Should Know
The start temperature of a fan stage is likely to change if the set point changes or if the bandwidth
changes according to the outside temperature.
1. Using the menu select arrow keys, navigate to Start / Stop Temps→Fan Stages .
2. Set the start and stop temperatures for each stage.
NOTE: Stage 1 stops when the room temperature falls 0.3 °F below its start temperature.
NOTE: The minimum difference between two consecutive start temperatures is of 0.5 °F (0.3 °C).
NOTE: The start temperature of a fan stage must be greater value than its stop temperature.
3. Set the number of degrees required for variable fans to reach their full speed in stages 1 and 2.
NOTE: If the Outside temperature compensation function is used, set these bandwidths separately
for winter and for summer
Outside Temperature Compensation: How it Works
Stage 1 and 2 bandwidths can be adjusted automatically as a function of outdoor temperature compensa-
tion. As the outside temperature decreases, stages 1 and 2 bandwidths increase gradually to compensate
for the change. The user specifies the bandwidth used in summer as well as the bandwidth used in winter
for both variable outputs of stages 1 and 2. The bandwidths can be adjusted from 1 to 10°F (0.6 to 5.6°C).
The winter’s bandwidth must be even or greater than the summer’s bandwidth.
NOTE: The ventilation stages’ start temperatures will be adjusted following the bandwidth fluctuations as
the outside temperature changes.
Setting the Winter and Summer Outdoor Temperatures
If the outside temperature compensation on the bandwidths of stages 1 and 2 is used, you must specify
at what outdoor temperature winter and summer start.
1. Using the menu select arrow keys, navigate to Start / Stop Temps→Outdoor Comp.
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