Trane XT300C Thermostat Operation Manual

The Trane XT300C is a deluxe programmable heat-cool thermostat for 24 VAC single-stage heating and cooling systems. It features automatic changeover, 7-day programming with 4 periods (Wake, Leave, Return, Sleep), keyboard controls for time, temperature, day, and programs, on-auto fan selection, temporary overrides, recovery mode, and installer setup options including compressor protection. It does not support emergency heat or outdoor temperature display. Below are the key specifications and operation instructions.

Key Specifications

• Power: 24 VAC from heating system transformer; Class II; provide disconnect and overload protection
• Operating Conditions: Average room temperature; install 5 ft above floor in good air circulation; avoid drafts, sun, appliances, pipes
• Dimensions: Wallplate for horizontal mounting on wall or 2x4 wiring box; mounting holes 5/16 in.
• Compatibility: Single-stage heat/cool systems with one transformer; gas/electric/oil; requires heat relay (e.g., TAYSTAT253A) if needed; not for multi-stage or emergency heat
• Setpoint Ranges:
  • Heating/Cooling: Factory defaults with 3°F differential; adjustable in setup
• Features:
  • 7-day programmable with 4 periods; automatic changeover; on-auto fan; keyboard controls; low battery indicator (2 AA batteries)
  • Installer setup for system options, clock format, scale (°F/°C), compressor protection (5 min off timer), recovery
  • Self-test mode; non-volatile memory
• Compliance: National/state/local codes; recycling for mercury thermostats

Operation Instructions

Initial Setup

1. Power On: After installation, batteries activate display.
2. Set Time/Date: Press Time key; adjust hour/minutes/day with Temp arrows; press Time to confirm.
3. Set Mode/Fan: System: Heat/Off/Cool/Auto; Fan: On/Auto.
4. Program Schedule: Press Program; set periods (Wake/Leave/Return/Sleep) with times/setpoints; copy to days.

Home Screen Navigation

1. Display: Room temp, setpoints, time, day, program period, system/fan status, low battery (Repl Batt).
2. Controls: Temp arrows for setpoints; System/Fan keys; Hold for override; Program for schedule; Time for clock.
3. Indicators: Heat/Cool On; Hold active; program period names.

Operating Modes

1. Heat: Activates heat when below setpoint.
2. Cool: Activates cool when above setpoint (after 5-min delay).
3. Auto: Automatic changeover with 3°F deadband.
4. Off: No operation.
5. Fan: On (continuous) or Auto (with calls).

Settings Screen

1. Access: Use Time/Program keys for clock/schedule; installer setup via Temp keys + Time.
2. Options: Clock format (12/24 hr), scale (°F/°C), auto changeover (on/off), fan control, compressor min off (5 min), changeover differential, setpoint limits.
3. Scheduling: 4 periods/day; set times/heat/cool setpoints; 7-day or copy days.
4. Overrides: Temporary Hold (returns to program); permanent via setpoint adjustment.

Advanced Features

1. Programming: 7-day schedule; recovery for gradual adjustment to next period.
2. Self-Test: Press Temp keys then Time; tests heat/cool/fan/keyboard.
3. Device Info: In self-test (70); view software/model.
4. Compressor Protection: 5-min minimum off timer.

Troubleshooting

• No Heat: Check 24 VAC R-W; reset breaker; verify mode/setpoint.
  
• No Cool: Check 24 VAC R-Y and C wire; verify setup.
  
• System On in Off: Check wiring shorts.
  
• Displays Wrong Mode: Verify auto changeover setup (option 2).
  
• Fan Issues: Check G terminal/fan relay.
  
• Program Not Holding: Review installer setup.
  
• Low Battery: Replace 2 AA; display shows Repl Batt.
  
• Persistent: Perform self-test; contact Trane service.

Installation Instructions

Warning: Qualified personnel only. Disconnect power. Follow lockout/tagout. Comply with codes.

Pre-Installation

• Location: 5 ft above floor, interior wall; good circulation; avoid drafts, sun, heat sources, pipes.
  
• Tools: Screwdriver, level, wire strippers.
  
• Wire: 18-22 AWG; label from old thermostat.

Wiring Diagrams

Terminal Designations (Single-Stage Heat/Cool with One Transformer):

Terminal	Description
R	24V Hot (Power)
W	Heat Relay
Y	Cool Compressor
G	Fan
C	Common (required for cooling-only)

Notes: Use heat relay (TAYSTAT253A) if system requires; provide overload protection; for cooling-only, wire per specific diagram.

Configuration Options

1. Mount wallplate horizontally; connect wires per diagram.
   
2. Power up; enter installer setup (Temp keys + Time): Set system (0=heat-cool), changeover (1=on), fan (2=gas/electric), clock, scale, min off timer, differential, limits.
   
3. Exit setup; set time/programs.
   
4. Perform self-test for heat/cool/fan.
   
5. Review against system requirements.

Calculation Tool

Estimate monthly energy savings from programming (assumes 4°F setback saving 0.15 kWh per hour unoccupied; 30 days/month).