Riseem STN621White 24V HVAC Control 2 Heat/1 Cool White
Non-programmable thermostat controls 24V heat pump or single-stage systems with 2 heat/1 cool stages, installs in 30 minutes and runs on 24VAC or two AAA batteries
- TypeThermostat,Two Screws and anchors,Installation manual and Op
- Size/Dimensions0.98 in x 3.86 in x 4.72 in
- ColorWhite
- Voltage24 volts_of_alternating_current
- Mount TypeWall Mount
- Relay ContactDigital, 24 volts_of_alternating_current
- Non-programmable simplicity for straightforward home climate control
- Dual 24 VAC or battery power removes C-wire requirement on most systems
- Large terminal blocks and universal sub-base enable DIY install within 30 minutes
- Backlit LCD and push-button interface give clear readouts and easy adjustments
- Compatible with heat-pump multi-stage and conventional single-stage forced-air systems
24V non-programmable thermostat
The Riseem STN621White is a 24 VAC wall-mount thermostat with a white backlit LCD and push-button controls. It operates on 24 VAC power or two AAA batteries and does not require a C-wire on most systems. The package includes the thermostat, two screws and anchors, cable labels, and both installation and operating manuals.
Heat pump and single-stage conventional systems
Suitable for heat pump systems with up to two heating stages and one cooling stage, or conventional single-stage heating and cooling. It also supports forced-air, electric furnace, hot-water, steam, gravity, millivolt, gas fireplace, floor furnace, wall furnace, and cool-only systems. Not for two-transformer, multi-stage conventional, dual-fuel, electric baseboard, line-voltage, convector, radiant-ceiling, mini-split, or 12 V RV systems.
No C-wire required on most systems
Dual power supply allows operation from 24 VAC or two AAA batteries, eliminating the need for a common wire except on heat-only or cool-only configurations. Large universal terminal blocks and a front-load battery compartment enable installation within 30 minutes.
Highlights
- Non-programmable simplicity for straightforward home climate control
- Dual 24 VAC or battery power removes C-wire requirement on most systems
- Large terminal blocks and universal sub-base enable DIY install within 30 minutes
- Backlit LCD and push-button interface give clear readouts and easy adjustments
- Compatible with heat-pump multi-stage and conventional single-stage forced-air systems
Specifications
| Type | Thermostat,Two Screws and anchors,Installation manual and Operating manual,Cable label, 24V Heat Pump Thermostat, Push Button |
|---|---|
| Brand | Riseem |
| Model | STN621White |
| Size/Dimensions | 0.98 in x 3.86 in x 4.72 in |
| Color | White |
| Voltage | 24 volts_of_alternating_current |
| Mount Type | Wall Mount |
| Relay Contact | Digital, 24 volts_of_alternating_current |
| Selling Unit | Thermostat,Two Screws and anchors,Installation manual and Operating manual,Cable label |
| Features | Heating and Cooling Controls, 24V Heat Pump Thermostat, Riseem |
Questions about this item
Will this thermostat replace my older 24V heat-pump unit without rewiring?
It supports 24VAC heat-pump systems with 2 heat/1 cool or 1 heat/1 cool staging and uses a universal sub-base with large terminal blocks for direct wire transfer.
How do I confirm the thermostat is operating correctly after mounting?
The white backlight LCD shows the current temperature and active mode; adjust the setpoint and verify the system starts heating or cooling within the adjustable swing range.
Which mounting hardware and documentation come in the package?
The box includes the thermostat, two screws and anchors, an installation manual, an operating manual and cable labels for wire identification.
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