Trane TCONT203AS42MA Thermostat Operation Manual

The Trane TCONT203AS42MA (XR203 Programmable Thermostat) is a 7-day or 5-1-1 programmable thermostat for two-stage 2H/1C heat/cool systems. It features a 3.5-inch backlit LCD display, energy-saving factory schedules with four periods per day (Wake, Leave, Return, Sleep), and adaptive intelligent recovery to reach programmed temperatures on time. Compatible with gas/oil/electric systems, it includes compressor lockout (5-minute minimum off time), air filter reminders, keypad lock, and battery backup. Below are the key specifications and operation instructions.

Key Specifications

• Type: 7-day or 5-1-1 programmable thermostat for 2H/1C systems
• Compatibility:
  • Gas/Oil/Electric (mV/24V), Heat Only, Cool Only, Heat/Cool systems
  • Systems: TAM7/TAM9 (24V Mode), GAF2-S, S9V2 Furnace, Heat/Cool Package with Variable Speed Blower, Heat/Cool Package, TEM6 VS Gas Furnace, GAT2/GAM2/TEM3,4
• Power:
  • DC: Two 1.5V AA Alkaline batteries
  • AC: 20-30 VAC, 50/60 Hz, NEC Class II
  • Wire: 18 AWG
• Temperature Range:
  • Cooling Setpoint: 45°F to 99°F (1°F resolution)
  • Heating Setpoint: 45°F to 99°F (1°F resolution)
  • Display: 32°F to 99°F (1°F resolution)
• Operating Conditions: 32°F to 105°F (0°C to 41°C) / 90% RH non-condensing
• Dimensions: 3-3/4” x 6” x 1-1/8” (HxWxD)
• Features:
  • 3.5” backlit LCD; Energy Star factory schedule (4 periods/day)
  • Compressor lockout (5-min min off time)
  • Air filter reminder (1-12 months)
  • Keypad lock; temp adjustment (±5°F); °F/°C
• Compliance: ENERGY STAR; UL listed

Operation Instructions

Initial Setup

1. Install Batteries: Pull thermostat from wallplate; insert two AA alkaline batteries (observe polarity). Snap back on. Remove battery tag if present.
2. Set Time: Press Set Time; adjust hour/minute with arrows; press Next for day; press Exit.
3. Set Schedule: Defaults to Energy Star 5-1-1; press Sched > Edit to customize.
4. System Mode: Press System for Auto/Heat/Off/Cool.
5. Fan Mode: Press Fan for Auto/On.

Home Screen Navigation

1. Display: Inside temp, set temp, mode, fan, schedule (Following/Hold), clock, day.
2. Keys: Fan (Auto/On), System (modes), Sched (scheduling), Hold (overrides), Clock (time), Screen (cleaning lock), More (outdoor temp/humidity/timers).
3. Adjustments: Arrows for temp; hold for permanent hold.
4. Cleaning: Press Screen to lock keys for 30s.

Scheduling and Presets

1. Edit Schedule: Sched > Edit > Select days > Period (Wake/Leave/Return/Sleep) > Set time/heat/cool/fan > Done.
2. Cancel Period: Sched > Edit > Period > Cancel Period.
3. Presets: Sched > Preset > Comfort/Energy Star > Yes to load.
4. Holds: Arrows for temp hold until next period; Hold for permanent; Vacation for days.
5. Recovery: Adaptive: Starts early to reach setpoint (shows "Recovery").

Settings Screen

1. Access Advanced: System (blank keys) > Center key (hold 5s) > "User Setup" > Up arrow to scroll.
2. Options: 0120: Year; 0130: Month; 0140: Day of week; 0150: Date; 0160: Time; 0330: DST (0/1); 0510: Humidifier timer; 0640: Time format (12/24).
3. Reminders: More > Edit > Set filter/UV/humidifier days.
4. Humidity: Arrows for dehum setpoint (select models).
5. Locking: Partial (specific keys) or Full (all); unlock via Advanced.

Advanced Features

1. Humidity/Dehum: Displays RH; set dehum setpoint (AC runs longer if high).
2. Reminders: Filter/UV/humidifier; reset via More > Reset.
3. Adaptive Recovery: Learns over 1 week; no aux heat during recovery.
4. Outdoor Temp: More key (with sensor).

Troubleshooting

• Keys Not Working: Screen locked; unlock via Advanced.
  
• No Heat/Cool: Verify mode/setpoint; "Heat On"/"Cool On" flashing (aux for heat pumps).
  
• "Wait": System delay.
  
• Battery Low: Replace AA batteries.
  
• Schedule Missing: Reload preset.
  
• Aux Heat Issue: Reset or check sensor/mode.

Installation Instructions

Warning: Professional installation. Disconnect power.

Pre-Installation

• Location: 5 ft floor, central, good circulation; avoid drafts/sun/heat.
  
• Tools: Screwdriver, level, drill.
  
• Mercury: Dispose properly (www.thermostat-recycle.org).

Wiring Diagrams

Terminal Designations:

Terminal	Description
R/RH (4-M-R5)	24V Power (Heating)
R/RC-V	24V Power (Cooling)
W/H-4	Heating Relay
G-F	Fan Relay
Y-Y6	Cooling Relay
O	Reversing Valve (Cool mode, HP only)
B	Reversing Valve (Heat mode, HP only)

Notes: Wire condensate switches between Y and Y1. X2 for aux during defrost. Remove jumper for 2-transformer RC/RH. Add for HP. Clip W905 for hydronic.

Configuration Options

1. Mount base level; connect wires.
   
2. Install batteries; snap cover.
   
3. Clip jumpers: W904 for °C; W905 for hydronic.
   
4. Test: Verify modes/setpoints.

Calculation Tool

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