American Standard Thermostat Ceratherm T050110 Manual

The American Standard Ceratherm T050110 is a non-programmable, single-stage heating/cooling thermostat designed for residential HVAC systems. It features a simple dial interface for temperature selection, system mode control (Heat/Off/Cool), and fan operation (Auto/On). Compatible with most 24VAC systems, it provides reliable temperature control with a clear, easy-to-read scale. Below are key sections for safety, features, installation, wiring, operation, and troubleshooting.

1. Features at a Glance 2. Installation & Mounting 3. Wiring Configuration 4. Specifications 5. Controls and Operation 6. System Setup & Calibration 7. Compatibility Notes 8. Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Temperature dial, System selector (Heat/Off/Cool), Fan selector (Auto/On), Mounting plate, Wire terminals.

Feature	Description
Temperature Dial	Rotating dial for setting desired temperature (typically 40°F to 90°F)
System Selector	Switch for selecting HEAT, OFF, or COOL mode
Fan Selector	Switch for FAN AUTO (runs with system) or FAN ON (continuous)
Mounting Plate	Base for wall mounting and wire connection
Wire Terminals	Screw terminals labeled for standard HVAC wiring (R, W, Y, G, etc.)
Mercury Switch (if applicable)	Temperature-sensitive vial for system control (older models)
Temperature Scale	Clear Fahrenheit scale with marked increments
Cover/Shell	Removable plastic cover for access to dial and switches

Installation & Mounting

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

Remove old thermostat: Label wires, disconnect from terminals.
Mount new base plate: Level and secure to wall using provided screws.
Connect wires: Insert labeled wires into corresponding terminals on plate (see Wiring section).
Attach thermostat body: Snap onto mounted plate.
Restore power: Turn circuit breaker back on.

WARNING! Electrical shock hazard. Always disconnect power before installation. If unsure, consult a qualified HVAC technician.

Wiring Configuration

Standard terminal designations for 24VAC systems:

Terminal	Wire Color (Typical)	Function
R	Red	24VAC Power (Heating/Cooling)
W	White	Heat Control
Y	Yellow	Cooling Control
G	Green	Fan Control
C	Blue/Black	Common (24VAC Return) - if required

Note: Wiring may vary by system. Refer to HVAC unit manual or existing wiring labels.

Specifications

Type: Non-programmable, manual dial thermostat.
Control: Single-stage heating and cooling.
Power: 24VAC from HVAC system (no batteries required).
Temperature Range: Approx. 40°F to 90°F (5°C to 32°C).
Switches: System (Heat/Off/Cool), Fan (Auto/On).
Compatibility: Most conventional 24VAC forced air, heat pump (if wired appropriately), and hydronic systems.
Mounting: Standard wall plate, level required.
Operating Temp: 32°F to 120°F (0°C to 49°C).

Controls and Operation

Setting Temperature: Rotate dial to desired temperature setting on scale.

Selecting Mode:
HEAT: System provides heat when room temp falls below set point.
COOL: System provides cooling when room temp rises above set point.
OFF: HVAC system is off (fan may still run if set to ON).

Fan Control:
AUTO: Fan runs only when heating or cooling is active.
ON: Fan runs continuously for air circulation.

Tip: For energy savings, set temperature lower in winter (Heat) and higher in summer (Cool) when away.

System Setup & Calibration

Thermostat is pre-calibrated. No user programming is required.

Ensure thermostat is level on wall for accurate temperature sensing.
Set SYSTEM switch to OFF during season changes or extended non-use.
Allow system to cycle completely; avoid frequent large adjustments.

Note: This is a non-programmable model. It maintains the temperature you manually set until changed.

Compatibility Notes

Compatible with most single-stage systems:

Conventional gas, oil, or electric furnaces.
Central air conditioners.
Heat pumps (requires correct wiring; may need auxiliary heat terminal).
Hydronic (hot water) heating systems with appropriate zone valve or relay.

Not Compatible With: Multi-stage systems, millivolt systems, line-voltage (120V/240V) baseboard heaters, or systems requiring a "power stealing" or digital communicating thermostat.

Maintenance

Unplugging not applicable. For cleaning, turn SYSTEM to OFF.

Gently remove cover by pulling from bottom.
Use soft, dry cloth to clean dial and interior. Do not use liquids.
Ensure no dust or debris blocks sensing element behind dial.
Snap cover back into place.

CAUTION! Do not spray cleaners. Do not attempt to recalibrate or repair internal components.

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. For support, contact American Standard Customer Service or visit www.americanstandard.com. Installation should comply with local electrical codes.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No system response	Power off, wrong mode	Check circuit breaker; ensure SYSTEM is set to HEAT or COOL, not OFF.
System won't turn off	Stuck relay, wiring	Turn SYSTEM to OFF. If continues, turn off power and check for stuck contacts or shorted wire.
Incorrect temperature	Location, calibration	Ensure not in direct sunlight or near heat source. Check level. May require professional calibration.
Fan runs continuously	Fan switch set to ON	Set FAN switch to AUTO for automatic operation.
Heating/Cooling comes on opposite of setting	Wiring error	Power off. Check if W (heat) and Y (cool) wires are reversed at thermostat or HVAC unit.

Reset: Turn SYSTEM to OFF, wait 30 seconds, return to HEAT or COOL.

Service: For persistent issues, contact a qualified HVAC technician. Do not attempt internal repairs.