IntelliPak units with Symbio 800 controls will generate an Invalid Timed Override request alarm if there is not a physical zone sensor or 10k resistor connected to the Zone Control Module (1KF10, J3-1 and J3-2) input. Communicating a zone temperature reading to the unit through BAS will NOT eliminate this diagnostic. There should be a software update by the end of year, 2022 that will fix this issue were you would not need a zone sensor input to eliminate the diagnostic. This diagnostic will not affect unit operation.
Note: Software Version 3.00.0006 is currently available to fix this issue.
What is Timed Override?
Timed Override (TOV) is a function that allows a user, located in the conditioned space, to temporarily override the IntelliPak operation from unoccupied mode to occupied mode (referred to as Occupied-Bypass). To accomplish this, Trane wired or wireless zone sensor devices are equipped with “On” and “Cancel” push buttons. Some sensors refer to the buttons as “Occupied” and “Unoccupied”. Timed override operation applies, in some way, to all unit types.
On Wired sensors, the timed override request (ON) and timed override cancel (CANCEL) buttons momentary modify the zone temperature thermistor resistance to a value outside the normal zone temperature operating range. The Symbio 800 controller detects this change; however, this momentary button press does not disrupt the space temperature value being used. The press duration is 0.5 to 8 seconds.
Wireless sensors process the timed override request/cancel signal at the sensor and communicate the appropriate timed override status (mode).
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.