Trane Baysens019c Manual Jun 2026

The BAYSENS019C uses a specific terminal layout to communicate with Trane unit controllers. Standard configurations typically require a 4-wire or 5-wire setup. Terminal Identification Table Terminal Label Function Description Connection Destination Serial communication link ReliaTel Board J6-1 / Voyager LTB-11 24 VAC 24-volt alternating current power ReliaTel Board J6-2 / Voyager LTB-12 Common 24 VAC common return ReliaTel Board J6-3 / Voyager LTB-13 Auxiliary External thermistor / Remote sensor option Optional remote sensor loops

Press the SYSTEM button to cycle through Cooling, Heating, or Auto modes. The active mode is typically highlighted on the display.

: Press the up/down keys to change the temperature manually. The sensor will typically hold this "Temporary Hold" for 2 hours before returning to its programmed schedule.

The (often referred to under its legacy and updated documentation series, such as the BAYSENS119 ) is a high-performance Programmable Zone Sensor designed for use with Trane commercial HVAC units like the Voyager and Precedent series.

: 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 trane baysens019c manual

Includes On (continuous) and Auto (cycles with heat/cool) modes. Temperature Ranges: Cooling: 45°F to 98°F. Heating: 43°F to 96°F.

⭐⭐⭐☆☆ (3/5) It does one job (wireless temp sensing for Trane RTUs) reliably, but the manual reveals limitations in battery life, pairing complexity, and missing features that competitors solved years ago.

The manual specifies . It does not promise 5+ years like some competitors (e.g., Honeywell). Instead, Trane is conservative, suggesting 1-2 years depending on transmit frequency. This is honest engineering. The manual provides a clear low-battery indicator sequence on the thermostat/controller, so you aren’t left guessing.

: For each period (Wake, Day, etc.), set the start time and the desired heating and cooling setpoints. Copy Function The BAYSENS019C uses a specific terminal layout to

It typically uses a numbered terminal configuration (e.g., terminals 1 to 1, 2 to 2) rather than standard lettered terminals (R, W, Y, G).

The BAYSENS019C utilizes the digital display to communicate system faults. Common Diagnostic Displays

Press to advance to the next period (Day) for Monday. Repeat the steps for all four periods of Monday.

The manual lists exact compatible Trane controllers (ReliaTel, LCI, etc.). It will work with non-Trane equipment or even older Trane electromechanical controls. If you’re a facility manager mixing brands, this sensor is a non-starter. The active mode is typically highlighted on the display

| Symptom | Probable Cause | Solution | |---------|----------------|----------| | | No 24 VAC power at terminals 11 & 14 | Check power supply. Verify terminal block is properly positioned on its pins. | | No communication with unit | Wiring fault or incorrect baud rate | Measure varying voltage (24–32 VDC) between 11 & 12. Check wiring. Verify Option 18 (baud rate) setting. | | Display shows "Sh" and COOL FAIL icon | Short circuit in remote sensor wiring | Check Option 11 (Remote Sensor). If set to 1, check terminals S1 & S2 for short condition. If set to 0, local thermistor is shorted—replace ZSM. | | Display shows "oP" and COOL FAIL icon | Open circuit in remote sensor wiring | Check Option 11. If set to 1, check S1 & S2 for open condition. If set to 0, local thermistor is open—replace ZSM. | | Zone temperature not displayed | Option 12 set incorrectly | Verify Option 12 = 1 (Display Zone Temperature). | | Keypad does not respond | Keypad lockout enabled | Press TIME "+" and TIME "–" for 4 seconds to unlock (if Option 14 = 1). | | Clock requires reprogramming after short power interruptions | Battery depleted | Replace with CR2032 3V lithium battery. | | "99" is displayed | Space temperature above or below measurable range | Sensor range exceeded—check actual space conditions. | | CHECK FILTER icon flashes | Accumulated run time exceeds filter interval | Press ERASE key to reset filter timer. Option 12 can adjust or disable this feature. | | Buzzer indicates system failure | System failure or service required | Press ERASE to reset buzzer (resets at noon next day if failure not corrected). | | Sensor communicating but unit won't run | Incorrect baud rate | Check Option 18; change from 1200 to 1024 for older units. |

Below is a guide covering the core functions of this sensor, based on official installation and operation documentation.

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