American Standard Thermostat SELECTRONIC 605XTMV Manual

The American Standard SELECTRONIC 605XTMV is a programmable electronic thermostat designed for precise temperature control of heating and cooling systems. It features a digital display, 7-day programming capability, automatic changeover between heating and cooling modes, adjustable temperature limits, and a built-in compressor protection delay. This manual covers safety, installation, programming, operation, and troubleshooting for optimal system performance.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Wiring Configuration 7. Programming Schedule 8. System Operation 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital LCD display, Program buttons, Mode selector, Fan control, Temperature adjustment buttons, Battery compartment.

Feature	Description
Digital Display	Shows current temperature, setpoint, time, day, and system mode
7-Day Programming	Allows separate schedules for weekdays and weekends
Automatic Changeover	Automatically switches between heating and cooling based on setpoints
Temperature Limits	User-adjustable minimum and maximum temperature settings
Compressor Protection	Built-in delay prevents short cycling of compressor
Battery Backup	Maintains settings during power outages (typically uses AA batteries)
Fan Control	Auto or On settings for continuous or automatic fan operation
Hold/Temporary Override	Allows temporary temperature adjustment without affecting schedule
Filter Change Reminder	Programmable reminder to change HVAC system filter
System Mode	Heat, Cool, Auto, Off

Installation

Turn off power to HVAC system at circuit breaker before installation.

Remove old thermostat: Label wires, disconnect from terminals.
Mount new backplate: Level and secure to wall using provided screws.
Connect wires: Insert labeled wires into corresponding terminals (R, W, Y, G, C, etc.).
Attach thermostat: Align and snap onto backplate.
Restore power and install batteries.

WARNING! Electrical shock hazard. Ensure power is OFF before handling wires. If unsure, consult a qualified HVAC technician.

First-Time Setup

After installation and power restoration, configure initial settings.

Set time and day: Use TIME and DAY buttons.
Select temperature format: Choose Fahrenheit or Celsius in settings.
Configure system type: Set for conventional or heat pump systems.
Set temperature limits: Define minimum cooling and maximum heating temperatures.
Program schedule: Follow programming steps for weekday/weekend periods.

CAUTION! Incorrect wiring or settings can damage HVAC equipment. Verify system compatibility before installation.

Specifications

Power Supply: 24VAC from HVAC system; Battery backup (2 AA batteries).
Temperature Range: Heating: 40°F to 90°F (4°C to 32°C); Cooling: 50°F to 99°F (10°C to 37°C).
Display: Backlit LCD digital display.
Compatibility: Conventional and heat pump systems (1H/1C).
Programming: 4 time periods per day, separate schedules for weekdays and weekends.
Accuracy: ±1°F (±0.5°C).
Terminals: R, W, Y, G, C, O/B, Aux/E, L (if applicable).
Operating Environment: 32°F to 105°F (0°C to 40°C); 80% RH max.

Controls and Settings

Access menus via MODE, FAN, and PROGRAM buttons. Front Panel: LCD display, Up/Down temperature buttons, HOLD button.

Button Functions: MODE (Heat/Cool/Auto/Off), FAN (Auto/On), PROGRAM (enter schedule programming), TIME/DAY (set clock), HOLD (temporary override).

Settings Menu: Access by holding PROGRAM button. Options include temperature format (F/C), filter change reminder interval, compressor protection delay, temperature limits, and system reset.

Wiring Configuration

Standard terminal designations: R (24V power), W (Heat), Y (Cooling), G (Fan), C (Common), O/B (Heat pump reversing valve).

Turn off HVAC system power at breaker.
Match wire colors to terminals (refer to old thermostat labels or system manual).
For heat pump systems: Connect O/B wire per system requirements (O for cooling, B for heating).
Ensure wires are securely inserted and no stray strands cause shorts.

Tip: Take a photo of old thermostat wiring before disconnecting for reference.

Programming Schedule

Create energy-saving schedules for weekdays and weekends.

Press PROGRAM button to enter programming mode.
Select day group: Weekday (Mon-Fri) or Weekend (Sat-Sun).
Set first time period: Use TIME button to set start time, then set temperature with Up/Down buttons.
Advance to next period: Press PROGRAM to move to next time period (up to 4 per day).
Repeat for other day groups.
Exit programming: Press MODE or wait for timeout.

WARNING! Do not set extreme temperature differentials (more than 2-3°F per period) to avoid system strain.

System Operation

In AUTO mode, thermostat automatically selects heating or cooling based on room temperature vs. setpoints. FAN AUTO runs fan only when system is active; FAN ON runs continuously. HOLD button overrides schedule temporarily; press again to resume program. Filter reminder flashes when interval is reached; press and hold FAN for 3 seconds to reset.

Care & Maintenance

Clean display with soft, dry cloth. Do not use liquids or abrasives. Replace batteries annually or when low battery icon appears. Check wiring connections periodically for corrosion or looseness.

CAUTION! Never spray cleaning agents directly on thermostat. Ensure power is off before inspecting wiring.

Regulatory Information

This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that it does not cause harmful interference. Copyright © American Standard Heating & Air Conditioning. For technical support, visit www.americanstandardair.com or contact 1-800-228-2962.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank display	Power loss/dead batteries	Check circuit breaker; replace batteries; ensure C wire connected.
System not turning on	Incorrect mode/wiring	Verify MODE setting (Heat/Cool); check wiring at thermostat and HVAC unit.
Temperature inaccurate	Location/sensor	Relocate away from heat sources/drafts; allow 5 minutes for stabilization.
Short cycling	Settings/compressor delay	Increase temperature differential; ensure compressor delay is enabled (default 5 min).
Schedule not following	Hold active/program error	Press HOLD to cancel override; reprogram schedule; ensure clock is correct.

Reset: Hold PROGRAM and DOWN buttons for 5 seconds to restore factory defaults.

Service: 1-800-228-2962; www.americanstandardair.com