BAYSENS019C (also identified as ASYSTAT666C ) is a programmable 7-day zone sensor designed for use with commercial HVAC systems, such as Voyager and Precedent units. Core Features and Specifications
The BAYSENS019C serves as a central control interface for rooftop units, offering more than just basic temperature adjustments. 7-Day Programming
: Allows for independent schedules for each day of the week with up to four periods per day (Wake, Day, Evening, Sleep). System Compatibility : Primarily compatible with units using Micro-Electronic Display Capabilities
: Features a digital LCD that shows the current time, temperature, system status (Cool, Heat, Auto), and fan status (On, Auto). Override Functions
: Includes a "Timed Override" button that allows users to temporarily bypass the programmed schedule for a set duration. Programming Your BAYSENS019C
To set a custom schedule, follow these general steps found in the Trane Installer's Manual Enter Program Mode : Press the button to begin the setup. Set the Day trane baysens019c manual
: Use the arrow keys to select the day of the week you wish to program. Set Time Periods
: For each period (Wake, Day, etc.), set the start time and the desired heating and cooling setpoints. Copy Function
: Many versions allow you to "Copy" one day's schedule to another to save time during setup. Exit and Save Run Program or wait for the screen to time out to save your settings. Common Troubleshooting & Operation Tips
If your system is not responding as expected, check these common points: System Mode
: Ensure the system is set to the correct mode (Heat, Cool, or Auto). If "Off" is selected, the HVAC system will not run regardless of the temperature. Sensor Calibration BAYSENS019C (also identified as ASYSTAT666C ) is a
: If the displayed temperature seems inaccurate, some Trane models allow for an Indoor Calibration offset via the advanced settings menu. Unlocking the Display
: If the buttons are unresponsive, try pressing and holding the
keys simultaneously for 3–4 seconds to disable a keypad lock. Blank Screen
: A blank screen often indicates a power loss to the unit or a tripped breaker rather than a sensor failure. Professional Installation Requirements
Trane emphasizes that field wiring and installation should only be performed by qualified personnel The Fix: Check the sensor placement
. Improper grounding or wiring poses fire and electrocution hazards and may violate local electrical codes. If you encounter persistent error codes, such as communication faults (often indicated by specific "SOP" or numeric codes), contact a licensed HVAC technician. on how to set up the Timed Override feature specifically? Top 7 Signs of a Bad Thermostat - Trane®
If the rooftop unit turns on and off rapidly, the sensor might be reading erratic temperatures.
The Trane BAYSENS019C is a wired remote zone sensor designed for use with select Trane commercial HVAC equipment, including packaged rooftop units, heat pumps, and air handlers that support a communicating or conventional thermostat interface. This sensor plays a critical role in monitoring space temperature and enabling proper system control.
If you can’t find the 019C, check for:
BAYSENS019A / 019B (earlier revisions – wiring often identical)BAYSENS107 (wired zone sensor with override)BAYSENS008 (basic wall sensor)