SAS920XFCT

Wireless LoRaWAN Thermostat for Commercial HVAC Energy Retrofit

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Zero-Rewiring Wireless Retrofit for FCU Systems

Supports Both 2-Pipe and 4-Pipe Fan Coil Units

7-Day Auto Schedule On/Off Energy Control

Accurate Runtime Metering for Tenant Billing

Global LoRaWAN Bands with OTAA/ABP Security

Remote Setpoint Limiting and Keypad Locking

Home Product HVAC Retrofit Smart HVAC Control Chilled Water System Controller

Product Description

Designed for massive commercial building retrofits, the SAS920XFCT is the ultimate wireless solution for FCU control without rewiring. Operating on standard Class C (OTAA/ABP), it supports a comprehensive range of global frequencies (IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4) for seamless network integration worldwide. It empowers facility managers with 7-day programmable auto schedule on/off capabilities to automate energy saving during non-business hours. Furthermore, it accurately measures cooling and heating runtime, enabling fair HVAC cost allocation among tenants. This smart controller simplifies digital transformation, slashing both CAPEX and energy waste while ensuring a significantly faster ROI.

Key Functions

Zero-Rewiring Retrofit

Replace legacy wired controllers without drilling or cabling.
Universal Compatibility

One device for both 2-pipe and 4-pipe fan coil unit systems.
Auto Schedule On/Off

7-day programmable timer to automate system operation and eliminate energy waste after hours.

Tenant Billing Support

Accurately tracks cooling/heating runtime for fair HVAC cost allocation.
Global Band & Secure Joining

Full support for IN865, RU864, EU868, US915, AU915, KR920, and AS923-1&2&3&4 via OTAA/ABP.
Admin Energy Control

Remote setpoint limiting and keypad locking to stop energy abuse.

Product Parameters

● Power Supply: 100–240 VAC, 50/60 Hz

● Temperature Detection & Display Range: 0–50 °C

● Temperature Control Range: 5–35 °C (adjustable via parameters)

● Temperature Control Accuracy: 1 °C

● Temperature Setting Accuracy: ±0.5 °C

● Operating Temperature: 0–50 °C

● Storage Temperature: –10 to 60 °C

● Protection Rating: IP20

● Maximum Valve Load Current: 3(2) A

● Maximum Fan Load Current: 5(3) A

● Dimensions: 86 × 86 × 14 mm

Product Application Scenarios

The top choice for Commercial Complexes, Office Buildings, and Schools where automated scheduling and accurate tenant billing are essential for lowering project costs and meeting green building standards.

Schools

Office-Building

Shopping-Mall

Partnership & OEM/ODM Support

We provide comprehensive technical backing to ensure your commercial retrofits achieve maximum ROI.

Customized Firmware

Tailored settings for specific LoRaWAN profiles and metering logic.
Global Connectivity Support

Expertise in regional frequency deployment and OTAA/ABP gateway pairing.
System Integration

Expert guidance for connecting nodes to any BMS, MQTT, or Billing platform.

FAQ

Yes. The SAS920XFCT is a universal controller designed to support both 2-pipe and 4-pipe fan coil unit (FCU) systems. It can be easily configured via the settings menu to match your specific system architecture.

No. One of its core advantages is "Zero-Rewiring." It utilizes the existing 85-260V power lines and communicates wirelessly via LoRaWAN, eliminating the need to pull new communication cables (like RS485 or BACnet), which significantly reduces installation costs.

Our hardware supports a comprehensive range of global bands, including IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923-1,2,3,4. It supports both OTAA (Over-the-Air Activation) and ABP (Activation by Personalization) for secure and flexible network joining.

Yes. The SAS920XFCT features a built-in runtime accumulation algorithm that accurately measures the total duration of cooling and heating activity. This data is transmitted to your platform, providing a reliable basis for HVAC cost allocation in multi-tenant buildings like offices and malls.

It is a Class C device. Since the thermostat is mains-powered (AC 85-260V), Class C allows it to keep its receiver open at all times. This ensures that remote commands—such as temperature overrides or keypad locking—are executed instantly without latency.

Facility managers can remotely lock the physical keypad to prevent unauthorized tampering and set "Setpoint Limits" (e.g., cooling no lower than 25°C). This ensures that energy-saving policies are strictly enforced in public spaces like schools, hospitals, and offices.

Yes, it features a 7-day programmable function. You can set up to 4 or 6 periods per day to automate temperature schedules, ensuring the system operates at economy levels during non-business hours to maximize ROI.

The device includes Anti-Sticking Valve Protection, which periodically triggers the valve to prevent seizing during long periods of inactivity. It also features Power-off Memory, ensuring all settings and accumulated runtime data are preserved during a power failure.

Even if the LoRaWAN network is temporarily unavailable, the SAS920XFCT continues to operate locally using the last saved schedules and setpoints. HVAC control is never interrupted; only remote monitoring and command updates are paused until connectivity is restored.

No. All core control logic—temperature regulation, scheduling, and runtime counting—runs locally on the device. The cloud or platform is used only for centralized management and data aggregation.

Yes. LoRaWAN is widely adopted in commercial and industrial IoT for its long-range stability and low interference. Combined with local control logic, the SAS920XFCT is designed specifically for reliable commercial HVAC operation.

A single LoRaWAN network can support hundreds to thousands of nodes, depending on gateway capacity and reporting frequency. This makes the SAS920XFCT suitable for large-scale deployments such as office towers, campuses, and malls.

Yes. Data can be forwarded to BMS, EMS, or billing platforms via standard interfaces such as MQTT or API, allowing seamless integration into existing management systems.

Absolutely. With broad global frequency support and flexible OTAA/ABP activation, the SAS920XFCT enables unified hardware selection across different countries and regions.

ROI varies by building usage and energy pricing, but many commercial retrofit projects recover investment within 1–3 years through reduced energy consumption and improved cost allocation.

It is ideal for multi-tenant office buildings, commercial complexes, schools, hotels, and retrofit projects where wiring work is costly or disruptive.

Yes. While it is especially advantageous for retrofit projects, the SAS920XFCT can also be used in new buildings to reduce initial cabling costs and accelerate deployment.

Related Products

LoRaWAN Class C OTAA/ABP thermostat

7-day auto schedule on/off controller

IN865/RU864/EU868/US915/AU915/KR920/AS923-1,2,3,4 wireless node

How to automate HVAC on/off schedules

HVAC cost allocation for tenants

no-rewiring thermostat for commercial energy upgrades

Get In Touch

Contact our friendly Customer Service team for any Question,Concern, or Suggestion. We'd love to hear from you!

Headquater hotline: +86 755 61218391

Headquater email: info@saswell.com

MENA tech support hotline: +97155 6743682

MENA tech support email: support@saswell.com

Wireless LoRaWAN Thermostat for Commercial HVAC Energy Retrofit

Product Description

Product Parameters

FAQ

Is the SAS920XFCT compatible with both 2-pipe and 4-pipe HVAC systems?

Does this thermostat require new data wiring for retrofits?

Which LoRaWAN frequency bands and activation modes are supported?

Can the device track energy usage for tenant billing?

Is it a Class A or Class C LoRaWAN device?

How does the "Admin Lock" feature help save energy?

Does the thermostat support scheduling?

What safety protections are built-in?

What happens if the LoRaWAN network goes offline?

Does the thermostat rely on the cloud to function?

Is wireless control reliable enough for commercial HVAC systems?

How many SAS920XFCT devices can be deployed in one project?

Can the thermostat integrate with existing BMS or energy platforms?

Is this product suitable for international or multi-region projects?

What is the typical ROI for a retrofit project using SAS920XFCT?

What types of buildings benefit most from this solution?

Is this solution suitable for both retrofit and new construction?

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