Electronic thermostat WT2 series

programmablerelaybuilt-in transmitter

Overview
WT2x1 is a LoRaWAN® Smart Thermostat family (models WT201 and WT211) designed to integrate with 24VAC HVAC systems including heat pumps, PTAC units, air conditioners, boilers and furnaces. It monitors ambient temperature via a built-in sensor and automatically activates heating or cooling stages to maintain target conditions, enabling consistent occupant comfort and reduced energy consumption across large-scale deployments.

Key Features

• LoRaWAN® connectivity for long-range, low-power wireless transmission; supports Milesight D2D for device-to-device communication.
• Compatible with common 24VAC HVAC wiring and systems (2H/2C furnaces/ACs, 4H/2C heat pumps with AUX/EM heat, PTAC, boilers).
• Two hardware variants: WT201 (standard relay ratings) and WT211 (heavy-duty relay for legacy retrofits with higher leakage currents).
• NFC one-touch configuration for fast on-site commissioning; supports FUOTA (firmware update over the air) and bulk management for zero-touch maintenance.
• Local data storage up to 1,000 entries with automatic retransmission after network outage.
• External temperature sensor support to read zone temperature when thermostat mounting is not ideal.
• User-friendly 4.2-inch LCD display with 5 physical buttons and child-lock and anti-theft mounting options for public/hospitality environments.

Adaptive Control & Operation

• Temperature control modes: Heat, Cool, Emergency (EM) Heat, and Auto (auto-switching between heating and cooling).
• Fan modes: Auto, On, Circulate (configurable).
• Support for 4 temperature control modes, dual target temperatures in Auto mode, and 3 fan modes to balance comfort and efficiency.

Scheduling, Alarms & Automation

• Up to 7 scheduling rules and up to 64 time schedules (16 schedules per rule) for precise climate automation across diverse building usage patterns.
• Proactive alerts including temperature threshold alarms, sustained high/low temperature warnings and freeze protection (auto heating activation to protect pipes/building assets).

Deployment & Integration

• NFC-based provisioning for rapid commissioning.
• Milesight D2D: direct 900 MHz point-to-point links (device-to-device) enable WT2x1 to receive temperature inputs from Milesight zone sensors (e.g. EM300-TH) for local control decisions.
• Standard LoRaWAN® uplink/downlink: sensors can report to LNS/cloud and WT2x1 can be controlled via downlink commands.
• Supports multicast, BACnet agent/object mapping, payload protocols (JSON) and cloud/BMS integrations.

WT211 — Heavy-Duty Relay Variant
WT211 is tailored for legacy commercial building retrofits where wiring degradation and elevated leakage currents exist. It provides a heavy-duty relay (designed for higher currents) to ensure stable HVAC control in demanding electrical environments and to reduce on-site failure risk during large-scale retrofits.

Primary Use Cases

• Residential multi-family buildings
• Hotels (card integration for guest check-in/check-out)
• Retail and shopping centers
• Hospitals and healthcare facilities
• Office and commercial buildings

Two-Stage Thermostat (principle)
Stage | Capacity | When Used | Benefit
Stage 1 (Low) | ~60–70% | Mild weather, small temperature gap | Quiet, energy-efficient, longer run time for better humidity control
Stage 2 (High) | 100% | Extreme weather, large temperature gap | Rapid response to reach setpoint quickly

Connectivity & Ecosystem

• LoRaWAN® (OTAA/ABP, Class C) with regional frequency support (US915, AU915, KR920, AS923 variants) and sensitivity down to -137 dBm.
• Tx power: up to 16 dBm (868 MHz) / 22 dBm (915 MHz).
• Integrates with Milesight gateways and Milesight Development Platform for device management, bulk configuration, remote updates and data routing to cloud or building management systems.

Downloads & Documentation (available)
Datasheet, user guide, payload protocol (JSON) mapping and BACnet object lists are provided by the manufacturer for system integration and deployment (documents available separately).

Caractéristiques / spécifications techniques

• Wireless Transmission: LoRaWAN®, Milesight D2D.
• Frequencies: US915 / AU915 / KR920 / AS923-1/2/3/4 (region-dependent).
• Tx Power / Sensitivity: 16 dBm (868 MHz) / 22 dBm (915 MHz); sensitivity -137 dBm.
• LoRaWAN Modes: OTAA / ABP, Class C.
• Compatibility: Works with most 24VAC HVAC systems including furnaces, ACs, heat pumps (with AUX), boilers, PTAC.
• Terminals: RC, RH, C, W1, W2/AUX, E, Y1, Y2/GL, G, O/B, PEK, DI, GND.
• Relay Ratings: WT201: 24VAC (typ. 150 mA, max 1 A). WT211: 24VAC (typ. 1 A; max per channel 3 A; max total 5 A) — WT211 recommended where higher leakage currents or heavy-duty switching required.
• Digital Input: 1 × DI (dry contact) for keycard, magnet switches, etc.
• Temperature Sensor: Built-in CMOSens® MEMS; range -20 °C to 60 °C (-4 °F to 140 °F); accuracy ±0.5 °C (0–60 °C) / ±1 °C (-20–0 °C); display resolution 0.5 °°C.
• Humidity Sensor: Range 0–100% RH; accuracy ±3% RH (40–85% RH), ±5% RH (0–40% / 85–100%); report resolution 0.5% RH.
• Display & Controls: 4.2-inch LCD segment display with white backlight; 5 external buttons (system on/off, temp up/down, mode, fan, reset).
• USB: 1 × Type-C (internal console).
• Configuration: NFC via mobile app, downlink configuration; supports multicast, FUOTA, local scheduling.
• Advanced Features: Local control schedule, freeze protection, fan delay, dehumidify control, 1,000-entry local data storage, data retransmission, D2D controller/agent functions, BACnet interoperability.
• Power Supply: WT201: 24 VAC (±15%), typ. 150 mA, max 1 A. WT211: 24 VAC (±15%), typ. 1 A, max per channel 3 A, max total 5 A.
• Power Consumption: < 1.2 W.
• Operating Conditions: -20 °C to 60 °C (-4 °F to 140 °F); 0–95% RH non-condensing.
• Ingress Protection: IP30 (indoor thermostat housing).
• Material & Color: PC + ABS (UL94 V0), white.
• Weight & Dimensions: 172 g; 113 × 110 × 21 mm (4.45 × 4.33 × 0.83 in).
• Installation: Wall screw mounting; anti-theft mounting supported.
• Regulatory / Approvals: FCC, ISED (region-dependent certifications may apply).