STN621 24V Digital Thermostat with 0.5°C Accuracy for Heat Pump Systems - 2 Heat 2 Cool Non-Programmable Control
The STN621 digital thermostat provides precise temperature control for heat pump systems with 0.5°C accuracy and flexible power options. This non-programmable unit features a large backlit LCD display for easy readability in various lighting conditions.
| Model Number | STN621 |
| Programmability | Non-Programmable |
| Temperature Range | 32°F-99°F (1°C-40°C) |
| Control Temperature Range | 44°F-90°F (7°C-32°C) |
| Temperature Accuracy | ±1°C (at 20°C) |
| Power Source | DC 2 x AAA 1.5V Alkaline batteries or 24VAC (18~30VAC), 50/60 Hz hardwire |
| Dimensions | 120 x 98 x 28 mm |
- 2 Heat / 2 Cool operation for heat pump systems
- Non-programmable push-button control
- Large, easy-to-read clear LCD display with backlight
- Multiple backlight color options
- Electric or Gas configurable
- Separate B & O terminals
- Independent heating and cooling swing adjustments
- Filter change indicator with selectable on/off function
- Contemporary frosted display design
- Auto change function automates heat to cool switching
Operates on either 2 x AAA alkaline batteries (not included) or 24VAC hardwired connection. Features separate heating and cooling cycle rate adjustments including 2nd stage adjustments for optimal performance.
All products undergo rigorous testing and hold CE, ROHS, and related certifications. Backed by 20+ years of manufacturing experience with professional engineering support for OEM/ODM requirements.
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