Trane Baysens019c Manual Jun 2026

24 VAC common wire powered directly from the Trane rooftop unit (UCP/RelyTel control boards).

Press to switch between setting the heating setpoint and cooling setpoint for that period. Use the arrows to adjust the temperatures.

provides comprehensive control over your HVAC system through its digital interface:

Trane commercial rooftop units and split systems. 2. Installation and Mounting Instructions trane baysens019c manual

The (also known as ASYSTAT666C) is a highly reliable, programmable zone sensor designed for light commercial and commercial applications. It acts as a sophisticated thermostat, providing precise temperature control for constant volume (CV) packaged units and packaged heat pump units (ranging from 3 to 130 tons depending on the unit type).

Use the or Next key to cycle through the different setup step codes. Common Setup Codes for Trane Controllers:

The primary communication wires (30VDC) that connect the sensor to the ReliaTel module. 24 VAC common wire powered directly from the

To prevent unauthorized changes, hold the (+) and (-) sides of the TIME key for 5 seconds (requires Option 14 to be enabled in the settings menu).

Check behind the thermostat to see if the hole where the wire bundle enters the wall is sealed. Unsealed holes draw cold or hot air from inside the wall cavity directly over the temperature sensor. If the sensor is clean and sealed but still incorrect, enter the Installer Setup to adjust the temperature calibration offset. Thermostat Says "Cool On" but No Cold Air is Blowing

The BAYSENS019C relies on low-voltage connections to communicate with the main HVAC controller board. Terminal Label Function Description R 24 VAC Power Supply (Hot) C 24 VAC Common Y1 / Y2 Cooling Stages (First / Second Stage) W1 / W2 Heating Stages (First / Second Stage) G Indoor Fan / Blower Relay O / B Reversing Valve (For Heat Pump configurations) T1 / T2 Remote Temperature Sensor Connections (Optional) provides comprehensive control over your HVAC system through

Always turn off the main power to the HVAC unit before removing or installing the thermostat backplate. Connect the low-voltage wires to the subbase terminals as follows: 24 VAC Power Supply Terminal 2 (Common): 24 VAC Ground / Common Terminal 3 (Data): Serial Communication Data Link Terminal 4 (Optional): External Remote Sensor input Terminal 5 (Optional): Auxiliary output or fault indicator

: Supports 7 individual days with 4 distinct periods (Occupied/Unoccupied) per day, allowing for up to 28 unique program settings.

: LED / Status Signal (usually for the "Service" or "Filter" light).

Given the complexity of commercial HVAC systems, Trane strongly recommends that the BAYSENS019C be installed and wired by a qualified, experienced HVAC technician.