analog to digital converter . . . . . . . . . . . . . . . 4 - UPGNet

to the active space temperature setpoint. If there is no RATSensor, the control will shut down all outputs. If the detectedsensor failure is a short circuit, the error can be declared only ifthe short persists for several minutes, in order to distinguish asensor failure from a short caused by somebody pushing onUnoccupied Override button.VAV operation: If the space temperature sensor fails, thecontrol will continue normal function, only SAT reset from spacetemperature will be disabled.BUILDING PRESSURE SENSORIf this sensor fails, the Power Exhaust control will default tooperate as a two position Power Exhaust. The Power ExhaustFan will be controlled as a fixed speed, ON/OFF Power exhaustfan, controlled from position of the Economizer damper. If theunit is equipped with a Modulating Exhaust Air Damper, thisdamper will be closed.DUCT STATIC PRESSURE SENSORIf this sensor fails, all outputs are turned off and the unit is shutdown.IAQ SENSORIf the IAQ sensor fails, Demand Ventilation mode is de-activated.SYSTEM ERRORSHEATING SAT FAILUREIn Heating mode and all stages of heating energized, the SATmust drive above the Supply Air Alarm Setpoint for Heatingwithin ten minutes or this SAT failure error will be activated. Theerror will be written to the Error History Buffer. In networkedapplication, the error flag will be readable by the network.COOLING SAT FAILUREIn Cooling mode and all stages of compression are energized, theSAT must drive below the Supply Air Alarm Setpoint for Coolingwithin ten minutes or this SAT failure error will be activated. Theerror will be written to the Error History Buffer. In networkedapplication, the error flag will be readable by the network.SUPPLY FAN FAILUREThe conditions under which this failure is declared, and thefollow-up actions of the control when this error occurs aredescribed in a paragraph on Air Proving Switch Operationearlier in this document. The error will be written to the ErrorHistory Buffer. In networked application, the error flag will bereadable by the network.COMPRESSOR SAFETY CHAIN TRIPThe conditions under which this failure is declared, and thefollow-up actions of the control when this error occurs aredescribed in a paragraph on Compressor Status Monitoringearlier in this document. The error will be written to the ErrorHistory Buffer. In networked application, the error flag will bereadable by the network.DIRTY FILTER ALARMThe conditions under which this failure is declared, and thefollow-up actions of the control when this error occurs aredescribed in a paragraph on Dirty Filter Switch (DFS) optionearlier in this document. The error will be written to the ErrorHistory Buffer. In networked application, the error flag will bereadable by the network.HIGH DUCT STATIC ALARMThe conditions under which this failure is declared, and thefollow-up actions of the control when this error occurs aredescribed in a paragraph on Duct Static High Limit Setpointoption earlier in this document. The error will be written to theError History Buffer. In networked application, the error flag willbe readable by the network.HOT WATER COIL FREEZE ALARMThe conditions under which this failure is declared, and thefollow-up actions of the control when this error occurs aredescribed in a paragraph on FSI (Hot Water Freeze Protection)option earlier in this document. The error will be written to theError History Buffer. In networked application, the error flag willbe readable by the network.Subject to change without notice. Printed in U.S.A. 351579-YTS-B-0608Copyright © 2008 by Johnson Controls, Inc. All rights reserved.Supersedes: 351579-YTS-A-0208Johnson Controls Unitary Products5005 York DriveNorman, OK 73069