Trane BAYSENS924 Thermostat Operation Manual

The Trane BAYSENS924 is a commercial touch screen programmable zone sensor designed for ReliaTel™ controlled systems like Precedent™, Voyager™, and Odyssey™ units. It features an intuitive color LCD interface, 7-day scheduling with up to three occupied/unoccupied events, demand shed functionality, and BACnet MS/TP communication. Compatible with UC400, Symbio™ 700/800 controllers for WSHP, fan coils, and unit ventilators. Below are the key specifications and operation instructions.

Key Specifications

• Type: Commercial touch screen programmable zone sensor
• Compatibility:
  • ReliaTel™ (with BCI-R, software v19.2+), UC400 (WSHP/fan coil/blower coil/unit ventilator), Symbio™ 700/800
  • Single-zone Voyager™, Precedent™, Odyssey™ systems; not for multi-zone or BAS
  • BACnet MS/TP communication; external inputs for demand shed, motion/occupancy, temp sensor
• Power:
  • 24 Vac (19-30 Vac), 50/60 Hz, Class 2; 6 VA max
  • 18 AWG or larger power wire
• Temperature Range: Operating: 32°F to 122°F (0°C to 50°C); Setpoints: Cool 60-85°F, Heat 55-80°F; Accuracy: ±0.9°F (±0.5°C)
• Dimensions: 4.74" H x 3.73" W x 1.07" D (120.5 x 94.8 x 27.15 mm); Weight: 0.75 lb (0.34 kg)
• Features:
  • Color LCD touch screen (5 themes); 7/5+2/5+1+1 scheduling (3 events/day)
  • Demand shed, optimal start/stop, standby mode, economizer control
  • Password protection, non-volatile memory, remote temp support
  • California Title 24 compliant; diagnostics and service alerts
• Compliance: UL 60730-1/2-9/2-13, FCC Part 15, RoHS; plenum-rated housing

Operation Instructions

Initial Setup

1. Power On: Snap cover on base; displays "Power on" then Home Screen; adjust clock if prompted.
2. Prerequisites: Ensure ReliaTel™/Symbio™ in correct mode (e.g., EFlex "DISPLAY READ ONLY"); provide operational schedule.
3. Installer Access: Enter password 4017 via Setup menu for configuration.

Home Screen Navigation

1. Display: Shows occupancy, temp, mode (off/auto/cool/heat), fan (auto/on), time; tap icons for controls.
2. Adjustments: Use up/down arrows for setpoints (1° increments); tap for mode/fan toggle.
3. Standby: Activates after inactivity; tap to wake.

Scheduling and Presets

1. Access: Tap Schedule icon; set clock/date, up to 3 occ/unocc events/day.
2. Types: 7-day, 5+2, 5+1+1; enable/disable via config.
3. Overrides: Tap corner for temp/occ toggle (15-240 min duration); crew limited to ±2-3°F for 1-2 hrs.

Settings Screen

1. Access: Setup menu (password 4017); navigate Configuration, Setpoints, Display, Network.
2. Key Settings: Setpoints (occ/unocc cool/heat), deadband (2-10°F), backlight (0-100%), language/units.
3. Security: User/main passwords; lock setpoints/schedules.

Advanced Features

1. Demand Shed: Dry contact input offsets setpoints (4-5°F); optional system off.
2. Economizer: Enable with temp/enthalpy setpoints; optimal start/stop.
3. Standby Mode: Motion-activated offset (2-5°F) during occ.
4. Service View: Monitors firmware, temps, faults, RH, equipment status.

Troubleshooting

• No Operation: Verify EFlex "DISPLAY READ ONLY"; check power/wiring.
  
• Contact Service: Sensor/economizer fault or comm loss; cycle power.
  
• Offline: Check addresses (sens 2/unit 1), baud 76800, polarity/shield.
  
• Schedule Issues: Adjust clock; re-enter events.

Installation Instructions

Warning: Qualified personnel only. Disconnect power; follow lockout/tagout. Plenum-rated; avoid direct sun/heat/drafts.

Pre-Installation

• Mount 54-60" above floor on interior wall; flat surface, good circulation.
  
• Wires: 18 AWG power, 22 AWG shielded comm (100-130 ohm impedance).
  
• Tools: Screwdriver, level, anchors; optional remote sensor.

Wiring Diagrams

For ReliaTel™: Power to RTRM, comm to BCI-R (set dials 0-0-1, BACnet link).

Terminal	Connection
5	24 Vac Power
6	Power Common
13	BACnet +
14	BACnet -
15	BACnet REF (Shield)
16/18	Demand Shed (Dry Contact)
17/18	Motion/Occ or Temp Sensor

Note: Polarity sensitive; ground shield at RTRM J7-COM.

Configuration Options

1. Enter Setup (password 4017); set schedule access, calibration, economizer.
   
2. Setpoints: Occ/unocc cool/heat, deadband, max/min limits.
   
3. Display: Theme, language, backlight, RH enable.
   
4. Network: Addresses (0-127), baud; reset instance with R button.

Calculation Tool

Estimate monthly energy savings from unoccupied setback (assumes 0.3 kWh per °F per hour; based on 3% energy per °F, 30 days/month).