DX Thermostat Series: Professional 2H/2C Control for RTU & Split Systems

DX Thermostat Series: Professional Control for RTU & Split Systems

Saswell’s DX Thermostat series is engineered for high-performance Direct Expansion (DX) systems. Designed for Rooftop Units (RTU), Split Systems, and PTACs, our controllers bridge the gap between complex HVAC hardware and intuitive energy management, ensuring optimal compressor lifespan and superior indoor comfort while meeting global energy codes.

Hot Products

Commercial BACnet DX/FCU Thermostat

BACnet FCU/DX controller. 2-stage, 0.1°C precision, ensuring smart BMS integration.

T29MTW-7-S-BACnet
Modbus Thermostat for Commercial FCU & DX Unit Control

T29MTW: BMS Modbus control for 2/4 pipe FCU, DX Units, and commercial systems.

T29MTW
RS485 Modbus Fan Coil Unit Controller for 2-Pipe Systems

A smart fan coil controller with Modbus connectivity, offering centralized management and enhanced comfort performance.

SAS923FCT
Commercial DX Unit Thermostat with Compressor Protection

Dedicated DX Cooling Thermostat: 7-day programmable with compressor protection for energy savings.

SAS921SLP
DX Thermostat with Modbus RTU for BMS Control

The Saswell SAS908MTW is a High-Precision DX Thermostat engineered for complex Commercial BMS Control. Featuring optional Modbus RTU (RS485) communication and robust 3-speed fan management, it ensures superior temperature accuracy and seamless system integration for high-performance HVAC systems.

SAS908MTW
Commercial RTU AHU Thermostat Multi Stage Heat Pump Control with Programmable Option

Reliable Multi-Stage RTU AHU Thermostat for Heat Pump systems, featuring optional programming.

T21STK

Application

Our controllers are universally compatible with specialized DX architectures, providing seamless management for multi-stage (2H/2C) configurations across commercial, industrial, and high-end residential HVAC infrastructures.

Key Functions

Multi-Stage Logic

Optimized 2H/2C staging logic for precise load matching and reduced energy consumption.
Compressor Guard

Built-in short-cycle protection and minimum run-time delays to extend equipment lifespan.
Airflow Mastery

Advanced 3-speed fan control with auto-fan selection for enhanced dehumidification and acoustics.

Seamless Linking

Industry-standard Modbus RTU / RS485 support for effortless BMS and centralized integration.
IAQ Integration

Smart terminal linkage for CO2 sensors and ventilation systems to ensure healthy classroom air quality.
Flexible Scheduling

7-day programmable logic for automated energy saving in commercial and educational facilities.

Application Scenarios

From expansive school campuses and corporate offices to specialized hospitality retrofits, our DX series adapts to diverse environments requiring robust Rooftop Unit management and high-efficiency split system orchestration.

Hospital

Office-Building

Schools

Partnership & Support

We empower our global partners with a comprehensive technical ecosystem designed to scale your business and minimize project risks.

Customized Solutions

Tailored firmware and hardware modifications to meet specific regional HVAC requirements.
Expert Technical Support

Direct access to senior engineers for wiring schematics, commissioning, and system troubleshooting.
Global After-sales

Comprehensive warranty coverage and a rapid-response service network for worldwide reliability.

FAQ

Our controllers provide model-specific support for a wide range of equipment, including Split Systems, Rooftop Units (RTU), and PTACs. We offer dedicated versions for Single-stage and Multi-stage (2H/2C) configurations to ensure perfect hardware-software synergy.

Yes. Our advanced models are engineered for 2-stage heat/2-stage cool logic, allowing the system to switch between stages based on indoor load, optimizing energy efficiency and comfort.

Depending on the model, we support 3-speed fan (High/Med/Low) control or single-speed configurations, catering to different airflow requirements of fan coil units or AHUs.

Reliability is our priority. Every controller features built-in Compressor Short-Cycle Protection. By enforcing a minimum off-time delay, it prevents the compressor from rapid cycling, which is the leading cause of premature hardware failure.

No. Our controllers utilize Permanent Memory Retention (Non-volatile memory). All programmed schedules and configuration parameters are safely stored, ensuring the system resumes operation immediately after power is restored.

Absolutely. We offer specialized models with Modbus RTU compatibility. Via a standard RS485 interface, multiple DX thermostats can be seamlessly integrated into a centralized BMS for unified data monitoring and control.

Yes. Our Wi-Fi enabled models allow facility managers to monitor and adjust temperature, modes, and schedules through a smartphone app, making them ideal for managing multiple commercial zones remotely.

Yes. We provide comprehensive Wiring Diagrams (R, C, Y, G, etc.) and technical documentation for all our partners. Our engineering team is also available for direct consultation on complex projects.

As a strategic OEM/ODM provider, we offer a 7-day rapid customization service for UI, Logo, and packaging, helping your brand enter the market faster.

DX Thermostat Series: Professional Control for RTU & Split Systems

Hot Products

Commercial BACnet DX/FCU Thermostat

Modbus Thermostat for Commercial FCU & DX Unit Control

RS485 Modbus Fan Coil Unit Controller for 2-Pipe Systems

Commercial DX Unit Thermostat with Compressor Protection

DX Thermostat with Modbus RTU for BMS Control

Commercial RTU AHU Thermostat Multi Stage Heat Pump Control with Programmable Option

FAQ

What types of DX systems do your controllers support?

Does the thermostat support 2-stage heating and 2-stage cooling?

What are the fan control options?

How does the controller protect the HVAC compressor?

Will my settings be lost during a power outage?

Can these controllers be integrated into a Building Automation System (BMS)?

Is remote mobile control available?

Do you provide wiring diagrams for technical support?

What is the lead time for custom OEM orders?