AAF UV05 Operation & Maintenance Manual
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Contents
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McQuay OM 751 23Description of OperationUnit Mode PriorityThe UVC uses the network variables and binary inputs listed in Table 10 and Table 11 todetermine the current unit mode. Special purpose UVC unit modes have higher priority thanthe normal UVC unit modes as shown in the tables.Each table lists the highest priority items on the left to the lower priority items to the right. Theright-most columns indicate unit operation as a result of the left-most columns. The term“Don’t care” in these tables implies that another network variable or binary input to the lefthas a higher priority.Table 10: Special purpose UVC unit mode priorityTable 11: Normal UVC mode priorityPriority resultEmergency overrideinput1Remote shutdownbinary inputEnergy holdoff input1Energy holdoff output2Unit modeoutput2 Actual UVC actionNormal3 De-energized4 Normal Normal See the normalUVC mode priority (Table 11)Energy hold off Energy hold off Off OffEnergized5 Don’t care Energy hold off Off OffPressurize Don’t care Don’t care Don’t care Off PressurizeDe-pressurize Don’t care Don’t care Don’t care Off De-pressurizePurge Don’t care Don’t care Don’t care Off PurgeShutdown Don’t care Don’t care Don’t care Off Off1. Network input.2. Network output.3. Normal indicates the UVC power-up condition.4. De-energized indicates that the contacts connected to this binary input are open.5. Energized indicates that the contacts connected to this binary input are closed.Priority resultApplication overrideinput 11. Network input.Unit mode overrideinput 1 Unit mode output 22. Network output.Normal (Auto)33. Normal (Auto) is the normal UVC power-up state.Normal (Auto) 3HeatCoolEmergency heatHeat HeatCool CoolNight purge Night purgeOff OffEmergency heat Emergency heatFan only Fan onlyHeat Don’t care HeatCool Don’t care CoolNight purge Don’t care Night purgeOff Don’t care OffEmergency heat Don’t care Emergency heatFan only Don’t care Fan only |
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