The American Standard Ceratherm 2050.210 is a programmable electronic thermostat designed for precise temperature control of heating and cooling systems. It features a digital display, multiple programming periods, hold/vacation functions, system mode selection (Heat/Cool/Auto/Off), fan control (Auto/On), and battery backup. Below are key sections for safety, features, installation, programming, operation, and troubleshooting.
Key components: Digital LCD display, Control buttons, Battery compartment, Wiring terminal block, Mounting plate.
| Feature | Description |
|---|---|
| Digital Display | Shows current temperature, setpoint, time, and system status |
| Programmable Schedule | 4 time periods per day (Wake, Leave, Return, Sleep) |
| System Modes | Heat, Cool, Auto (automatic changeover), Off |
| Fan Control | Auto (cycles with system) or On (continuous) |
| Hold/Vacation | Temporary or extended temperature override |
| Battery Backup | 2 AA batteries preserve settings during power loss |
| Filter Change Alert | Programmable reminder light |
| Keypad Lock | Prevents unauthorized changes |
| Temperature Range | 40°F to 99°F (4°C to 37°C) |
| Compatibility | 24VAC systems; single and multi-stage heat/cool |
Turn off power to HVAC system at circuit breaker. Remove old thermostat.
WARNING! Electrical shock hazard. Ensure power is OFF before installation.
After power restore, configure initial settings.
CAUTION! Allow 5 minutes between system mode changes to prevent compressor damage.
Front Panel: MENU, SET CLOCK, PROGRAM, HOLD, FAN, SYSTEM (mode), UP/DOWN arrows.
Display Icons: Heat/Cool indicator, Fan On, Hold, Battery Low, Filter Alert.
Menu Settings: Clock format (12/24 hr), Temperature offset, Cycle rate, Filter timer, Keypad lock, System type (conventional/heat pump), Stage configuration. Programming: 7-day programmable with 4 periods per day (Wake, Leave, Return, Sleep).
Standard terminal designations:
| Terminal | Wire Color | Function |
|---|---|---|
| R/Rc/Rh | Red | 24VAC Power (Cooling/Heating) |
| W/W1 | White | Heat Stage 1 |
| Y/Y1 | Yellow | Cool Stage 1 |
| G | Green | Fan Relay |
| O/B | Orange/Blue | Heat Pump Reversing Valve |
| C | Blue/Black | Common 24VAC |
| W2/Y2 | Various | Heat/Cool Stage 2 |
Tip: Refer to HVAC system manual for specific wiring requirements.
Default program: Wake 6:00AM (70°F), Leave 8:00AM (62°F), Return 6:00PM (68°F), Sleep 10:00PM (62°F).
Note: Press HOLD to temporarily override schedule; press RUN SCHEDULE to resume.
Vacation Hold: Press HOLD, then VACATION; set temperature and duration (1-99 days). Filter Alert: Set reminder interval (30-365 days) in MENU > FILTER TIMER. Temperature Calibration: Adjust displayed temperature ±5°F in MENU > TEMP OFFSET. Keypad Lock: Enable in MENU > LOCK to prevent changes.
Clean display with soft, dry cloth. Do not use liquids or abrasives. Replace batteries annually or when low battery icon appears. Reset filter timer after filter change.
CAUTION! Do not spray cleaning agents directly on thermostat.
UL Listed. FCC Part 15 Class B compliant. This device complies with Part 15 of FCC Rules. Copyright © American Standard. For support, visit www.americanstandard.com or contact 1-800-843-0304.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Blank display | Power loss/batteries | Check circuit breaker; replace batteries. |
| System not responding | Incorrect wiring/mode | Verify wiring connections; ensure SYSTEM mode is correct. |
| Inaccurate temperature | Location/calibration | Relocate away from heat sources; calibrate in menu. |
| Short cycling | Cycle rate setting | Adjust cycle rate in advanced settings. |
| Fan runs continuously | Fan mode setting | Change FAN mode from ON to AUTO. |
| No heat/cool | Setpoint/temperature | Ensure setpoint differs from room temp by 2°F; check mode. |
Reset: Remove batteries, turn off power for 30 seconds, then restore.
Service: 1-800-843-0304; www.americanstandard.com