Trane TAYSTAT 375 Thermostat Operation Manual

The Trane TAYSTAT 375 is a multistage electronic thermostat providing control for 24 VAC two-stage heating and two-stage cooling systems. It requires a common wire for power and supports automatic changeover with fan operation in heat mode. Ideal for residential applications, it features an LCD display for easy setpoint adjustments and system status. Below are the key specifications and operation instructions.

Key Specifications

• Type: Multistage electronic thermostat for 24 VAC systems
• Compatibility:
  • Two-stage heating and two-stage cooling
  • Conventional application where equipment controls fan in heat mode
  • Automatic system changeover
• Power:
  • 24 VAC with common wire required
• Temperature Range: Heating and cooling setpoints with minimum 3°F deadband
• Display:
  • LCD with system and fan status
• Features:
  • System modes: Heat, Off, Cool, Auto
  • Fan modes: On, Auto
  • Installer setup for fan operation, deadband (3°F minimum)
• Compliance: UL listed; mercury notice for disposal

Operation Instructions

Initial Setup

1. Power On: After installation, apply power; display shows room temperature.
2. Set System Mode: Press System key to cycle Heat, Off, Cool, Auto.
3. Set Fan Mode: Press Fan key to cycle On, Auto.
4. Adjust Temperature: Use keyboard (up/down arrows) for setpoints.

Home Screen Navigation

1. Display: Shows room temperature, setpoints, mode status.
2. Controls: System key for modes; Fan key for fan; keyboard for adjustments.
3. Indicators: Dynamic labels for functions.

Operating Modes

1. Heat: System to Heat; raise setpoint.
2. Cool: System to Cool; lower setpoint.
3. Auto: Switches heat/cool with 3°F deadband.
4. Off: System inactive.
5. Fan: Auto with system; On continuous.

Settings Screen

1. Access Installer Setup: Hold Increase/Decrease 3s; displays setup number.
2. Fan Operation: Setup 1: Conventional (equipment controls fan) or Thermostat (controls fan).
3. Deadband: Setup 2: Minimum 3°F between heat/cool (default).
4. Exit: Timeout after 5 min or advance through options.

Advanced Features

1. Installer System Test: Hold Increase/Decrease until 00; advance with Increase for tests (e.g., fan, stages).
2. Compressor Protection: Bypassed in test mode.
3. Changeover: Automatic in Auto mode.

Troubleshooting

• Display Off: Check B-R 24 VAC; verify common wire.
  
• No Cooling: Check B-R or R-Y 24 VAC; verify mode/setpoint.
  
• Continuous Operation: Check setpoints; verify wiring.
  
• Erratic Behavior: Cycle power; check for shorts.

Installation Instructions

Warning: Trained technician only. Disconnect power before wiring.

Pre-Installation

• Mount 5 ft above floor, good circulation, avoid drafts/sun.
• Tools: Drill, level, screwdriver.

Wiring Diagrams

For multistage heating/cooling:

Terminal	Connection
R	24V Power
B	Common
W1	Heat Stage 1
W2	Heat Stage 2
Y1	Cool Stage 1
Y2	Cool Stage 2
G	Fan

Note: Pull wires through wallplate; secure with screws.

Configuration Options

1. Hold Increase/Decrease 3s for Installer Setup.
   
2. Set fan operation (Setup 1).
   
3. Set deadband (Setup 2, min 3°F).
   
4. Run system test (hold to 00, advance).

Calculation Tool

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