Trane TAYSTAT 340 Thermostat Operation Manual

The Trane TAYSTAT 340 is a programmable low-voltage thermostat designed for residential heating and cooling systems, offering customizable 7-day scheduling with four periods per day (Wake, Leave, Return, Sleep) for weekdays and weekends. It features an LCD display for time, day, period, temperature, and status, with automatic changeover in Auto mode and fan control for energy-efficient operation. Compatible with single- and multi-stage conventional and heat pump systems, it includes temporary and indefinite holds for flexibility. Below are the key specifications and operation instructions.

Key Specifications

• Type: Programmable low-voltage thermostat for residential HVAC
• Compatibility:
  • Single- and multi-stage conventional and heat pump systems
  • Auto changeover with minimum 3°F deadband
  • Fan control (Auto/On)
• Power:
  • 24 VAC low voltage
• Temperature Range: Heat: 55°F to 90°F; Cool: 60°F to 99°F; Accuracy: ±1°F
• Display:
  • LCD showing time, day, period, temperature, and status icons
• Dimensions: Compact wall-mount design
• Features:
  • 7-day programming with 4 periods/day (Wake, Leave, Return, Sleep) for weekdays/weekends
  • Temporary and indefinite temperature holds
  • System modes: Heat, Cool, Off, Auto
  • Fan modes: Auto, On
  • Preset schedules: Comfort or Energy Star
• Compliance: UL listed; 5-year warranty

Operation Instructions

Initial Setup

1. Power On: After installation, the display shows the current time (blinking if unset).
2. Set Clock: Press Select to enter clock mode; use Increase/Decrease to adjust time and day; press Select to confirm.
3. Set System Mode: Toggle switch to Heat, Cool, Off, or Auto.
4. Set Fan Mode: Toggle switch to Auto or On.

Home Screen Navigation

1. Display: Shows current time, day (e.g., MON TUE WED THU FRI), period (Wake/Leave/Return/Sleep), room temperature, setpoint, and status (Heat/Cool indicators).
2. Controls: Increase/Decrease keys for setpoints; Select key to enter programming/clock; System/Fan switches for modes.
3. Backlight: Activates on key press.

Scheduling and Presets

1. Enable Scheduling: Scheduling is enabled by default; customize via programming.
2. Weekday Schedule (Mon-Fri): Press Select to enter; set times/temperatures for Wake/Leave/Return/Sleep; displays MON TUE WED THU FRI.
3. Weekend Schedule (Sat-Sun): Continues to SAT SUN after weekdays.
4. Presets: Load Comfort (mild setbacks) or Energy Star (deeper setbacks) via Schedules menu.
5. Holds: Press Hold for indefinite override; temporary via arrows.

Settings Screen

1. Access: Press Select for clock/programming; use Increase/Decrease to navigate.
2. System/Fan: Toggle switches for modes.
3. Programming: Set periods, copy days, load presets.
4. Exit: Press Hold or timeout.

Advanced Features

1. Auto Mode: Automatically switches between heat/cool based on setpoints.
2. Hold Options: Indefinite (press Hold) or temporary (arrows in Hold mode).
3. Copy Schedule: Duplicate weekdays to weekends or vice versa.
4. Energy Savings: Use presets for optimized unoccupied setpoints.

Troubleshooting

• Clock Blinking: Reset via Select > Set Clock.
  
• System Not Responding: Verify mode (not Off), setpoint, and wiring.
  
• Rapid Cycling: Check minimum off-timing (built-in).
  
• Display Issues: Replace batteries if low-voltage backup fails.
  
• Programming Errors: Reload preset or re-enter schedule.

Installation Instructions

Warning: Professional installation required. Disconnect power before wiring.

Pre-Installation

• Mount 54-60" above floor, away from drafts/sun.
• Use 18-22 AWG wire.

Wiring Diagrams

For single-stage conventional:

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

Note: For heat pump, add O/B for changeover.

Configuration Options

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

Calculation Tool

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