Trane TAYSTAT 540 Thermostat Operation Manual

The Trane TAYSTAT 540 is a programmable electronic thermostat for controlling single- and multi-stage conventional and heat pump systems. It features a large LCD display, 7-day scheduling with up to 4 periods per day, automatic changeover, and fan control for energy-efficient operation. Below are the key specifications and operation instructions.

Key Specifications

• Type: Programmable electronic thermostat
• Compatibility:
  • Single/multi-stage conventional and heat pump systems
  • Auto changeover with 3°F deadband
  • Fan control (Auto/On)
• Power:
  • 24 VAC low voltage
• Temperature Range: Heat: 55°F-90°F; Cool: 60°F-99°F; Accuracy: ±1°F
• Display:
  • Large LCD with time, day, period, temp, status
• Dimensions: Compact wall-mount
• Features:
  • 7-day scheduling (4 periods/day)
  • Temporary/indefinite holds
  • System modes: Heat, Cool, Off, Auto
  • Presets: Comfort/Energy Star
• Compliance: UL listed; 5-year warranty

Operation Instructions

Initial Setup

1. Power On: Display shows time (blinking if unset).
2. Set Clock: Press Select; adjust time/day with Increase/Decrease; Select to confirm.
3. Set Mode: System switch to Heat/Cool/Off/Auto.
4. Set Fan: Fan switch to Auto/On.

Home Screen Navigation

1. Display: Time, day, period, room temp, setpoint, status.
2. Controls: Increase/Decrease for setpoints; Select for programming; switches for modes.
3. Backlight: On key press.

Scheduling and Presets

1. Enable: Default on; customize via Select.
2. Weekdays: Set Wake/Leave/Return/Sleep times/temps; shows MON-FRI.
3. Weekends: SAT-SUN.
4. Presets: Load Comfort/Energy Star via Schedules.
5. Holds: Hold key for indefinite; temporary via arrows.

Settings Screen

1. Access: Select for clock/programming.
2. System/Fan: Switches for modes.
3. Programming: Set periods, copy days, load presets.
4. Exit: Hold or timeout.

Advanced Features

1. Auto: Switches heat/cool with 3°F deadband.
2. Copy Schedule: Duplicate weekdays/weekends.
3. Energy Savings: Presets for unoccupied setpoints.

Troubleshooting

• Clock Blinking: Reset via Select > Clock.
  
• No Response: Verify mode/setpoint/wiring.
  
• Cycling: Built-in delays.
  
• Display: Power cycle.
  
• Errors: Reload preset.

Installation Instructions

Warning: Professional only. Disconnect power.

Pre-Installation

• Mount 54-60" high, no drafts/sun.
• 18-22 AWG wire.

Wiring Diagrams

Single-stage conventional:

Terminal	Connection
R	24V Power
W	Heat
Y	Cool
G	Fan
C	Common

Note: Heat pump: Add O/B.

Configuration Options

1. Select for programming.
   
2. Set clock/day.
   
3. Load preset/custom schedule.
   
4. Test modes.

Calculation Tool

Estimate monthly savings from scheduling (1% per °F setback; 30 days/month).