Applications Guide Tracer Graphical Programming - Trane

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® Chapter 7 Constant-volume AHU example Controlling the humidifier Writing the alarms program The alarms program indicates diagnostic conditions to the operator and protects the equipment from potential harm when such a condition exists. According to the sequence of operations, the following diagnostic conditions require an alarm indication: • Dirty filter • Duct humidity high limit • Exhaust fan failure • Low outdoor air temperature • Low (mixed air) temperature detection • Sensor failure (including discharge air temperature, mixed air temperature, outdoor air temperature, and space temperature) • Supply fan failure The following failures shutdown the air handler and require a manual reset: • Discharge air or mixed air temperature sensor failure • Fan failure • Low mixed air temperature All alarms must be resettable at the operator display. The requirements for the Alarms program are nearly identical to the same program in the VAV air handler with one exception: The duct static pressure high limit is no longer needed. The duct humidity high limit was added. The high limit for the duct static pressure is not applicable to a constant-volume AHU. The use of humidification requires the addition of a duct humidity high limit. Set the program properties as shown in Figure 152 on page 177. 176 CNT-APG001-EN
® Writing the alarms program Figure 152: Alarms program properties Figure 153: Manual reset alarms For the constant-volume air-handling unit, remove the duct static pressure limit from the manual reset alarms module as shown in Figure 153. CNT-APG001-EN 177
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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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® Programming best practices Set t
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® Summary-question answers PROGRAM
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® Index dehumidification, 166-169,
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