AP Expert VT-110, User Manual

Page: 45 / 84

Chapter 11: Air Inlets
Opening Compensation According to Temperature or Static
Pressure: How it Works
Temperature compensation
The inlet temperature compensation is expressed as a percentage per degree difference between the
average controller temperature and the average reading of the probes assigned to the inlet. It determines
by how much the inlet must open or close to help reduce the temperature differences in the building. For
each degree above or below the average temperature, the inlet will open or close using the compensation
value assigned by the user. For example, if the compensation value is set to 2%/°F and the inlet's probes
read 3°F above the average controller temperature, the inlet will open 6% to help decrease the tempera-
ture in that zone. The maximum temperature compensation value is 10%.
Static pressure compensation
The static pressure compensation is expressed as a percentage per 0.01inch of water (%/0.01"WC). It
determines by how much the inlet must open or close to help reduce or enhance the static pressure in the
building according to set points. For each .01"WC above the high static pressure set point or below the
low static pressure set point, the inlet will open or close using the compensation value assigned by the
user. For example, if the compensation value is set to 1%/"WC and the static pressure is 0.05"WC above
the high static pressure set point, the inlet will open of 5% to help decrease the static pressure in the
building. The maximum static pressure compensation value is 10%.
Setting the Temperature and Static Pressure Compensation
1. Using the menu select arrow keys, navigate to Inlet→Compensation→Temp & Static .
This menu is accessible if the inlet is enabled.
2. Set the Temperature compensation to the desired value.
3. Set the static pressure compensation to the desired value.
This parameter is accessible if the static pressure sensor is used.
Selecting the Static Pressure Compensation Stages
1. Using the menu select arrow keys, navigate to Inlet→Compensation→Static Stages .
This menu is accessible if the inlet is enabled and the static pressure sensor is enabled.
2. Put a checkmark beneath the fan stages on which the static pressure compensation is applied.
Setting the Static Pressure Setpoints
When the high pressure set point is reached, the inlet opens to the static pressure compensation value; it
closes by the same amount when the low pressure level is reached. The static pressure high and low set-
points can be adjusted from 0 to 0.2 inches of water.
1. Using the menu select arrow keys, navigate to Inlet→Stat pressure .
This menu is accessible if the inlet is enabled and if the static pressure sensor is used.
2. Set the high and low static pressure setpoints to the desired value.
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