AP Expert VT-110, User Manual

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13
Stir Fan
Topics Covered in this Chapter
▪ Stir Fans: How it Works
▪ Setting the Stir Fan Start and Stop Temperatures
Stir Fans: How it Works
The controller can control one stir fan output. This output can operate in 3 different ways.
Stir fans in hot temperature conditions
If the temperature in the room is too high, stir fans can be enabled to create an air draft to cool down the
animals. When they are used for this purpose, stir fans start operating continuously when the room tem-
perature reaches the output’s start temperature. The output is disabled when the temperature falls below
its stop temperature.
Stir fans in cold temperature conditions
When the room temperature is too low, stir fans can be activated to disperse the warm air produced by
heating units uniformly throughout the building. When they are used for this purpose, stir fans start run-
ning in timer mode when the room temperature falls below the output’s start temperature. They are dis-
abled when the room temperature rises and reaches the output’s stop temperature.
Stir fans used to reduce temperature differences between probes
Stir fans can start running in timer mode when there is a considerable temperature difference between
the reading of two probes. This function is used to ensure the uniformity of the temperature in the house.
When they are used for this purpose, stir fans start running when the difference of temperature between
two probes exceeds a user-defined temperature limit; they stop when the temperature difference between
the probes gets 0.5°F (0.3°C) below the limit.
890-00081 Expert VT-110 49