Applications Guide Tracer Graphical Programming - Trane

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® Chapter 7 Constant-volume AHU example Alarm indication and reset Writing the mode and setpoints program The mode and setpoints program for this constant-volume air-handling unit calculates setpoints and determines the heat/cool mode. This program is nearly identical to that used for the VAV air-handling unit, with the following exceptions: • Determination of the space temperature setpoint source is required by the sequence of operation. • Discharge air setpoint validation is not required for a constant-volume air-handling unit. • For this constant-volume air handler, the program implements a night heat/cool decision. Set the program properties as shown in Figure 157 on page 181. 180 CNT-APG001-EN
® Writing the mode and setpoints program Figure 157: Mode and setpoints program properties When complete, this program will perform the following tasks: • Setpoint source determination • Effective space setpoint calculation • Heat/Cool mode determination, including night heat/cool Implementing effective space setpoint calculation The effective space setpoint calculation for the constant-volume air-handling unit is exactly the same as that used for the VAV air-handling unit. First, determine the setpoint based on the occupancy mode and the default setpoints as shown in Figure 158 on page 182. One important distinction exists between the setpoint calculation module here and the one you used for the VAV air-handling unit. Instead of using default setpoints associated with the DAC profile, use the default setpoints associated with the SCC profile. CNT-APG001-EN 181
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Applications Guide Tracer Graphical
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CNT-APG001-EN ®
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® Special notifications and format
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® Contents Arrangingblocks........
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® Contents Chapter 5 Cooling tower
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® Contents Chapter7 Constant-volum
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® Contents Summary-question answer
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® Figures Chapter3 Modifyingtheexh
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® Figures Figure 96: Input blocks
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® Figures Chapter 8 Constant-volum
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® Figures xx CNT-APG001-EN
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® Tables Chapter7 Constant-volumeA
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® Chapter 1 Using the Tracer Graph
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® Chapter 6 VAV AHU example Review
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® Chapter 6 VAV AHU example Table
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® Summary-question answers PROGRAM
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® Index dehumidification, 166-169,
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Applications Guide Tracer Graphical Programming - Trane

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