Trane TAYSTAT 371 Thermostat Operation Manual

The Trane TAYSTAT 371 is an electronic low-voltage thermostat designed for residential heating and cooling systems, providing simple and reliable control for conventional and heat pump configurations. It features a large digital LCD display for room temperature and setpoints, with system modes (Heat, Cool, Off, Auto) and fan options (Auto, On). No batteries required, it supports automatic changeover in Auto mode with a minimum 3°F deadband. Below are the key specifications and operation instructions.

Key Specifications

• Type: Electronic low-voltage thermostat (non-programmable)
• Compatibility:
  • Conventional gas/electric heat and cool systems
  • Heat pump systems with auto changeover
  • Single- and multi-stage configurations
• Power:
  • 24 VAC from HVAC system (no batteries required)
• Temperature Range: Heat: 55°F to 90°F; Cool: 60°F to 99°F; Accuracy: ±1°F
• Display:
  • Large digital LCD for room temperature and setpoints
• Dimensions: Compact wall-mount design
• Features:
  • System modes: Heat, Cool, Off, Auto (with 3°F minimum deadband)
  • Fan modes: Auto, On
  • Simple temperature adjustment with visual indicators
• Compliance: UL listed; 5-year limited warranty

Operation Instructions

Initial Setup

1. Power On: After installation, the display shows the current room temperature.
2. Set System Mode: Use the SYSTEM switch to select Heat, Cool, Off, or Auto.
3. Set Fan Mode: Use the FAN switch to select Auto or On.
4. Adjust Temperature: Use the up/down arrows to set the desired temperature.

Home Screen Navigation

1. Display: Shows current room temperature with a room indicator; setpoints adjustable via arrows.
2. Controls: SYSTEM switch for modes; FAN switch for fan; arrows for temperature.
3. Indicators: Visual feedback for temperature changes and mode status.

Operating Modes

1. Heat Mode: SYSTEM to Heat; adjust setpoint above room temp.
2. Cool Mode: SYSTEM to Cool; adjust setpoint below room temp.
3. Auto Mode: SYSTEM to Auto; switches between heat/cool with 3°F deadband.
4. Off Mode: SYSTEM to Off; system inactive.
5. Fan: Auto (runs with system) or On (continuous).

Settings Screen

1. System and Fan: Controlled via bottom switches on thermostat.
2. Temperature Display: Shows room temperature; adjust with arrows.
3. Deadband: Fixed at 3°F in Auto mode (no user adjustment).
4. Exit: Changes take effect immediately.

Advanced Features

1. Auto Changeover: Automatically selects heat or cool based on setpoints.
2. Temperature Adjustment: Visual indicators show changes; prevents equipment damage.
3. Compressor Protection: Built-in delays to avoid short cycling.

Troubleshooting

• Display Blank: Check power supply and HVAC breaker.
  
• No Heat/Cool: Verify mode/setpoint; check wiring/fuses.
  
• Rapid Cycling: Allow built-in delays; ensure proper installation.
  
• Erratic Temperature: Check location; clean or replace if faulty.
  
• Equipment Damage: Follow caution notes to avoid compressor harm.

Installation Instructions

Warning: Professional installation required. Disconnect power before wiring.

Pre-Installation

• Mount 54-60" above floor, away from drafts/sun/heat sources.
• Use 18-22 AWG wire; max length 250 ft.

Wiring Diagrams

For single-stage conventional (Gas/Electric):

Terminal	Connection
R	24V Power (Red)
W	Heat (White)
Y	Cool (Yellow)
G	Fan (Green)
C	Common (Blue)

Note: For heat pump, add O/B for reversing valve; jumper R/Rc if single transformer.

Configuration Options

1. Enter installer mode (hold Mode + Fan).
   
2. Set system type (conventional/heat pump).
   
3. Adjust deadband (fixed 3°F).
   
4. Test heat/cool/fan; save and exit.

Calculation Tool

Estimate monthly energy savings from Auto mode deadband (assumes 0.3 kWh per °F per hour; 3°F fixed deadband; 30 days/month).