Trane Nexia TCONT624AS42DA Thermostat Operation Manual

The Trane Nexia TCONT624AS42DA is a Touchscreen Comfort Control for forced air heating and cooling HVAC systems, featuring a Z-Wave module for remote control via Nexia Home Intelligence. It provides typical operation for HVAC systems with remote access capabilities using a smartphone, tablet, or PC (requires SK101 bridge kit and Nexia account). The device includes an interactive 4.3” black & white touchscreen and supports 7-day programmable scheduling with 4 periods per day. Key elements include a built-in humidity sensor with RH display, maintenance reminders, remote temperature sensing options, and humidifier control.

Key Specifications

• Type: 24V Z-Wave comfort control for forced air HVAC systems (heating and cooling)
• Compatibility:
  • Compatible with Z-Wave networks via Nexia Home Intelligence (requires SK101 bridge kit for remote access)
  • Supports indoor types: GAS/OIL, ELECTRIC, HYDRONIC; outdoor types: AC, HP, NONE; C/O with Cool or Heat (HP only)
  • Requires variable speed blower for certain features like PWM fan settings
• Power:
  • 24 Volt common and hot wire required for operation
• Temperature Range: Heating setpoint: 55-90°F (max); Cooling setpoint: 60-99°F (min); H/C Delta: 3-15°F; ESM Heat: 55-90°F (default 62°F); ESM Cooling: 60-99°F (default 85°F)
• Dimensions: Interactive 4.3” black & white touchscreen
• Features:
  • Remote access via Nexia; 7-day programmable with 4 schedules/day; built-in humidity sensor
  • Filter/maintenance/humidifier reminders; remote sensing (1 indoor/1 outdoor)
  • Auxiliary & compressor heat lockouts; dehumidification (overcooling) and enhanced dehumidification (cooling)
  • Adjustable variable speed fan (PWM); Energy Savings Mode (ESM); screen lock and guest lock
  • Upgradable firmware; service test modes; humidifier control; continuous fan options
  • RH setpoints (Cooling: 30-60% default 50%; Heating: 10-45% default 40%)
• Compliance: FCC ID WIBTZW012 (complies with Part 15 of FCC Rules for Class B Digital Device); IC 9374A-XR624 (complies with Industry Canada license-exempt RSS standards). Limited Warranty: Base 1 year for controls; extends to 5 years if registered online

Operation Instructions

Initial Setup

1. Set Time/Date: Menu > User Settings: Select Hour (1-12 am/pm), Minutes (0-59), Day of Week (Sun-Sat), Year (2013-2113), Month (Jan-Dec), Date (1-31). Defaults to factory preset 7-day energy savings schedule (e.g., Wake 6:00 AM: 70°F Heat/78°F Cool; Day 8:00 AM: 62°F Heat/85°F Cool; Evening 6:00 PM: 70°F Heat/78°F Cool; Night 10:00 PM: 62°F Heat/78°F Cool). Enable local scheduling (default Yes). Clock blinks if not set; auto-updates via Nexia if connected.
2. Z-Wave Enrollment: For Nexia integration, use SK101 bridge: Prepare bridge (unplug, install 9V battery, verify blue blink); hold within 6 ft; press + on bridge; Menu > Next to Z-Wave > Select; orange light solid when complete. Verify: Menu > Next to About > Next to Node ID (non-00 confirms).

Home Screen Navigation

1. Display: Clock (upper left), dynamic labels/function buttons, setpoint display with up/down arrows (adjust heat/cool; min 3°F separation), current temperature (internal sensor adjustable), Menu button (access settings), System Mode button (Off/Heating/Cooling/Auto/EM Heat), Fan Mode button (Auto/On/Circ with 1-59 min/hour), Schedule Mode button (Hold/Run/ESM).
2. Controls: Press setpoint button to adjust; MODE to change mode.
3. System Modes: Off, Heating, Cooling, Auto, EM Heat. Fan Modes: Auto, On, Circ.

Scheduling and Presets

1. Enable: Menu > User Settings > Schedule > Enable Schedule (ON).
2. Edit Schedule: Menu > User Settings > Schedule > Edit Schedule > Select Day > Set Time (up/down arrows) > Heat Setpoint > Cool Setpoint > Next through periods > Done to save.
3. Copy Schedule: After editing, select Yes to copy to next day(s) via Yes/No buttons > Done.
4. Schedule Modes: Hold (maintains current setpoints); Run (follows schedule); ESM (uses predefined setpoints).
5. 1-Touch Presets: Not explicitly detailed; use ESM for energy savings presets.

Settings Screen

1. Access: Menu > User Settings > Select > Next through options > Done to save.
2. Thermostat Settings: Temperature Scale (Fahrenheit/Celsius); Cooling RH Setpoint (30-60%, default 50%); Heating RH Setpoint (10-45%, default 40%); Smart Continuous Fan (Yes/No); Continuous Fan Airflow (35-100%); Fan Circulate On Time (1-59 min or Off); Local Schedule Enable (Yes/No); Max Heat Setpoint (55-90°F); Min Cooling Setpoint (60-99°F); H/C Delta (3-15°F).
3. Energy Savings Mode: ESM Heat Setpoint (55-90°F, default 62°F); ESM Cooling Setpoint (60-99°F, default 85°F).
4. Display: Screen Timeout (0-90 sec); Backlight Timeout (0-90 sec); Backlight On/Off Percent (0-100%); Buzzer Enable (Yes/No).
5. Security: Unlocked/Display Lock/Guest Access (default Unlocked); disable by holding up/down arrows.

Advanced Features

1. Reminders: Filtration (Yes/No, periods Monthly-Annually); System Maint (Yes/No, months).
2. Firmware Upgrades: Via mynexia.com > Edit Home > Firmware Updates > Update (up to 45 min).
3. About Screen: Menu > About: Version, ZWAVE Ver, Node-ID, Home-ID, Out-Type, C/O Type, In-Type.
4. Clean Screen: Menu > Clean Screen > Yes; use water/soft cloth.
5. Dehumidification/Humidification: Installer-enabled; RH setpoints adjustable.

Troubleshooting

• Clock Blinks: Set clock via Menu > User Settings.
  
• Node ID 00: Failed enrollment; repeat Z-Wave process.
  
• Gray Thermostat Icon on Nexia: May require Z-Wave repeaters; contact 877-288-7707.
  
• HVAC Issues: Contact servicing dealer.
  
• General: For failures from misuse/improper installation, warranty excludes; contact Nexia support.

Installation Instructions

Warning: Professional installation required. A 24 Volt common and hot wire MUST be connected for operation. Contact servicing dealer for full setup.

Pre-Installation

• Mount on interior wall, 54-60" above floor, away from drafts/sun.
• Prepare 24V power with common; Wi-Fi for Nexia (SK101 bridge kit).
• High-speed internet required for remote access.

Wiring Diagrams

Standard low-voltage for HVAC (professional wiring; see installer manual):

Terminal	Connection
R	24V Power (Hot)
C	Common
W1	Heat Stage 1
Y1	Cool Stage 1
G	Fan
O/B	Changeover (HP)

Note: For Z-Wave, connect via SK101 bridge; full diagrams in installer guide.

Configuration Options

1. Power up; run User Setup Wizard for time/date/schedule.
   
2. Enroll Z-Wave with SK101.
   
3. Set thermostat options: Scale, RH setpoints, fan, schedule enable.
   
4. Test modes; upgrade firmware via Nexia.

Calculation Tool

Estimate monthly energy savings from ESM (assumes 0.5 kWh/hr per °F difference; 30 days/month).