Applications Guide Tracer Graphical Programming - Trane

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® Summary-question answers Figure 199: Adding nviEmergOverride 2. As noted in the question, the valve override may be set to off, open, or closed. Although additional parts of the variable may be used to communicate a percentage or flow value, the <strong>Tracer</strong> Summit system supports use of only the first element of the structure. Here, values of 0% and 100% are assumed for override modes of closed and open, respectively (Table 35). Table 35: SNVT_hvac_overrid structure contents Element SNVT Notes State hvac_overrid_t Override mode, enumerated Percent SNVT_lev_percent From –163.83% to 163.83% Flow SNVT_lev_percent From –32,768 to 32,767 244 CNT-APG001-EN
® Chapter 8, “Constant-volume AHU with warm-up, pre-cool, and communica- Figure 200: Valve override interpretation Selected enumerations for the state, or override mode, are shown in Table 36. Remember, you are checking for values of 0, 4, or 5. Table 36: SNVT_hvac_overrid (hvac_overrid_t) enumerations Value Identifier Notes 0 HVO_OFF Not overridden 1 HVO_POSITION Override position—use percent field 2 HVO_FLOW_VALUE Override flow in liters/second—use flow field 3 HVO_FLOW_PERCENT Override flow percentage—uses percent field 4 HVO_OPEN Override to position = 100% 5 HVO_CLOSE Override to position = 0% 6 HVO_MINIMUM Override to configured minimum 7 HVO_MAXIMUM Override to configured maximum –1 HVO_NUL Invalid value Note:This table was adapted from the LonMark Standard Enumeration Master List. Figure 200 shows the logic used to interpret the valve override. The De-Enumerator block interprets the override mode. The Switch blocks select the appropriate desired valve position based on the override mode. The resulting wireless connections are used to communicate the override values to both the cooling and heating valves as shown in Figure 201 on page 246 and Figure 202 on page 246. Next,startwiththecoolingvalvemodulepicturedinFigure172on page 208. Substitute a wireless connection, CoolValve, for the cooling valve analog output. Then add another Switch block to select the source of the cooling valve control. In normal operation, the calculated cooling valve position is passed to the analog output. When an override exists, the override value is passed to the analog output (Figure 201 on page 246). CNT-APG001-EN 245
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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 Summary-question answer
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Page 276: Trane An American Standard Company
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