ST75 - Thermostat Emerson - Free user manual and instructions
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| Product Type | Thermostat |
| Brand | Emerson |
| Model | ST75 |
| Compatibility | 24 VAC heating and cooling systems |
| Display | Large backlit LCD |
| Programming | 7-day programmable with 4 time periods per day |
| Temperature Range | 40°F to 90°F (4°C to 32°C) |
| Accuracy | ±1°F (±0.5°C) |
| Power Supply | 24 VAC hardwired with 2 AA batteries backup |
| Operating Humidity | 5% to 90% non-condensing |
| Dimensions | 4.5 x 3.5 x 1.2 inches (114 x 89 x 30 mm) |
| Weight | 0.6 lbs (272 g) |
| Functions | Heat, Cool, Auto, Fan Only |
| Fan Control | Auto or Manual |
| Filter Change Reminder | Yes, programmable |
| Keypad Lock | Yes |
| Installation | Wall-mounted with included hardware |
| Maintenance | Clean with a soft, dry cloth; no harsh chemicals |
| Safety | For use with systems rated up to 2.5 A per terminal |
| Certifications | cULus listed |
Frequently Asked Questions - ST75 Emerson
How do I set the current time and day?
Press the SET button, then use the up and down arrows to adjust the time and day. Press SET again to save your selection.
How do I program the weekly schedule?
Press MENU, choose the Schedule option, and set the four time periods for each day of the week. You can copy settings from one day to another for convenience.
What does the battery icon mean?
The battery icon indicates low battery levels. Replace the two AA batteries with fresh ones to ensure continued operation during power outages.
Can this thermostat be used with a heat pump?
Yes, the ST75 is compatible with heat pump systems and includes settings for auxiliary heat and emergency heat.
How do I switch between Fahrenheit and Celsius?
Enter the System Setup menu by pressing and holding MENU, then navigate to the temperature unit option and select °F or °C.
How do I temporarily override the schedule?
Simply press the up or down arrows to adjust the temperature. The new temperature will hold until the next scheduled period begins.
Is there a vacation hold feature?
Yes, you can use the Hold feature to maintain a constant temperature for up to 24 hours. For longer vacation periods, program a permanent hold or adjust the schedule accordingly.
How do I clean the thermostat?
Use a soft, dry cloth to wipe the display and housing. Avoid using water, solvents, or any harsh cleaning agents.
What should I do if the display is blank?
Check the circuit breaker or fuse for the heating/cooling system, then replace the backup batteries. If the display remains blank, verify the wiring connections at the thermostat.
Does it have a filter change reminder?
Yes, you can program a filter reminder to appear after a specified number of runtime hours. This helps maintain air quality and system efficiency.
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USER MANUAL ST75 Emerson
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Product information
Brand : Emerson
Model : ST75
Category : Thermostat