YS4004
YoLink Thermostat 2, Dual-Stage Heat & Cool
Set temperatures and schedules for a compatible heating and cooling system from the wall or the YoLink app.
Requires a C-wire and a compatible 24 V AC HVAC system. Not for millivolt or 120/240 V systems. A YoLink hub is required for remote app access; the thermostat does not connect directly to Wi-Fi.
Order notes & regional requests
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Product details
Technical specifications
- Compatible system
- Common 2-stage 24 V AC heating and cooling systems
- Wiring
- C-wire required; a C-wire or adapter must be installed if absent
- Not compatible
- Millivolt or 120/240 V systems
- App connection
- YoLink hub required; no direct Wi-Fi connection
- Power
- 24 V AC/500 mA
- Temperature Range (Scheduled)
- 41°F-95°F, (5°C-35°C)
- Operating temperature
- -4°F-122°F (-20°C-50°C)
- Dimensions
- 115 × 115 × 22.2 mm (L x W x D)
- ECO Setting Range
- 2°F-9°F, (1°C-5°C)
- Calibration Range
- -9°F-9°F, (-5°C-5°C)
- Processor
- Semtech® LoRa® RF Module YL09V2 microcontroller with 32-Bit RISC processor
More product & safety information
The thermostat supports dual-stage heating and cooling and compatible heat-pump setups. Verify equipment wiring against the installation guide.
Up to two compatible YS8007 temperature and humidity sensors can be selected as the temperature source. Auxiliary heat and demand-response functions can also be configured.
Manuals & setup
Instructions for the model in this product.