Applications Guide Tracer Graphical Programming - Trane

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® Summary-question answers Figure 189: Equip Room Exhaust Fan program with a modification 7. Delete the ON constant block. Connect the output of the Fail block to both the Relay Control and Normally Open ports of the Switch block (Figure 189). Figure 190: Feedback Alarm block substitution Chapter 4, “Cooling tower with two-speed fan example” 1. The Latch block may be configured in timed or manual mode. In manual mode, it does not provide for a time-interval input. 2. Omit the Delay on Start block and its associated Constant block. Chapter 5, “Cooling tower with variable-speed fan example” 1. The Feedback Alarm block is a combination of the XOR, Delay on Start, and Latch blocks. The sequence of operation might read as follows: Compare Request to Status. If Request does not equal Status for a period of 30 seconds, initiate an alarm. The alarm must be resettable. See Figure 190 for the possible substitution. 2. See Figure 191 on page 237 for an example of how you could automatically reset the alarm reset without using a Switch block. Each time the program runs, the Alarm Reset is set to off. 236 CNT-APG001-EN
® Chapter 6, “VAV AHU example” Figure 191: Automatically resetting the alarm reset without a Switch block Turning the alarm reset off Chapter6,“VAVAHUexample” 1. In the program, Discharge Air Control, use the Enthalpy block to calculate the outside air enthalpy. Note that the relative humidity in this solution is obtained with a nvi and that the Deadband block remains an integral part of the economizer decision. Compare Figure 192 on page 238 with Figure 113 on page 121, where the outdoor air temperature is used. ➤ Using the Enthalpy block Use the Enthalpy block to calculate the enthalpy of moist air based on dry-bulb temperature (°F or °C) and relative humidity (%). Select the input and output units in the properties dialog box. CNT-APG001-EN 237
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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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Page 276: Trane An American Standard Company
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Applications Guide Tracer Graphical Programming - Trane

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