Trane BAS-APG001-EN manual Programming, Mechanical reactions during AST

Chapter 7 Programming

(On/Off), self-test enable, and self-test reset. Damper direction and fan state are set to Open/On for 5 minutes then Close/Off for 5 minutes. There is also a “blink” function built into the program fragment. Whenever the AST is enabled and there are no mechanical faults, the trouble LED will blink.

Resetting mechanical system faults is somewhat ambiguous. If the fault occurs in the smoke alarm mode, the alarm can be reset when the request stops. However, an AST-based fault must be annunciated and held until the fault is repaired. It is not clear what faults are allowed to clear the alarm, as there is no “reset fault” function available on the smoke control panel. Discussion with UL revealed that it is acceptable to annunciate the alarm until the next AST. Thus, the selfTestFailReset binary variable, shown in Figure 56, is used to reset all AST triggered faults.

Figure 56. Mechanical reactions during AST

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