Emergency Override - Trane Symbio 700 Application Manual

B B u u i i l l d d i i n n g g A A u u t t o o m m a a t t i i o o n n S S y y s s t t e e m m S S u u p p p p o o r r t t S S e e q q u u e e n n c c e e s s
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If more than one mode is requested at the same time, the Pressurize request will have priority
followed by Purge, and then Exhaust. When Any Ventilation Override mode is active, all heating
and cooling is turned off. For the case where the unit is required to turn Off via hardwired
interface, the Equipment Shutdown input is used.

Emergency Override

All units with Symbio 700 support the remote Emergency Override Command functionality.
Within this point, there are addition enumerations versus the hardware Ventilation Override
interface:
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Pressurize, Depressurize, and Purge map to their respective Ventilation Override Modes directly. ,
Emerg_Shutdown and Emerg_Fire are unique to Emergency Override. Both of those are treated
as a remote shutdown request for the equipment.
E E q q u u i i p p m m e e n n t t O O p p e e r r a a t t i i o o n n
Emergency and Ventilation Override requests/actions will take priority over normal equipment
timing events, such as compressor minimum ON/OFF/Inter-stage timers.
During an Emergency or Ventilation Override sequence, all temperature control algorithms are
initialized to an inactive state until the Emergency or Ventilation Override request is cleared. For
each override request, the unit will operate in a pre-determined state until override requests are
cleared.
For detailed unit operation during Emergency or Ventilation Override, refer to the Appendix
section of this document.
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Exhaust mode
1 = EMERG_NORMAL
2 = EMERG_PRESSURIZE
3 = EMERG_DEPRESSURIZE
4 = EMERG_PURGE
5 = EMERG_SHUTDOWN
6 = EMERG_FIRE
ACC-APG001A-EN