SAS908MTW

DX Thermostat with Modbus RTU for BMS Control

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Superior High Accuracy Control: Temperature precision up to ±0.1°C (±0.2°F).

Optional Modbus RTU Integration: Seamlessly connects to Building Management Systems (BMS).

Large Backlit LCD Display: Ensures clarity and easy reading in any light.

3-Speed Fan Management: Provides flexible High/Med/Low fan control for DX Units.

Non-Volatile Memory: Permanently retains all user settings after a power outage.

2H/2C System Support: Compatible with advanced 2-stage heating and cooling systems.

Home Product Commercial Thermostats DX Unit Thermostats

Product Description

The SAS908MTW DX Unit Thermostat is an advanced, energy-efficient controller designed for high-resolution temperature management within Commercial HVAC and BMS Control environments, supporting comprehensive 2H/2C (2-Stage Heat/2-Stage Cool) units. A key differentiator is the optional Modbus RTU (RS485) communication capability... Coupled with its guaranteed High Accuracy (±0.1°C) and dependable non-volatile memory, the SAS908MTW delivers exceptional reliability and performance.

Key Functions

High Accuracy Temperature Sensing

Provides ultra-fine temperature sensing with an accuracy of ±0.1°C (±0.2°F) for optimal comfort and system efficiency.
Multi-Stage System Support

Supports up to 2-stage heating and 2-stage cooling (2H/2C), ensuring broad compatibility with advanced heat pump and AC units.
Modbus RTU Central Management

Specific models integrate Modbus RTU (RS485) for connectivity to a central BMS or gateway, enabling remote monitoring and configuration.

Three-Speed Fan Control

Offers manual or automatic control over the fan, with three selectable speeds (High/Med/Low) plus a fan-off option.
Power-Off Memory Retention

Utilizes non-volatile memory to permanently store all user settings, schedules, and operational configurations, even after a power loss.
Internal/External Sensor Flexibility

Offers the option to use the internal sensor for standard room control or an optional external sensor for pipe or duct temperature monitoring.

Product Selector

Model No.

Heat/cool

Cool only

Pipe

Speed fan

Programmable

Window card

Room card

External Sensor

Modbus RTU

WIFI

Power

Manual

SAS908MTW-0-S-485

√

220/24VAC

download

SAS908STW-0-S

1H/1C

√

24VAC

download

SAS908MTW-0-S

2H/2C

√

24VAC

download

SAS908STW-0-F1

√

220VAC

download

Product Parameters

Power Supply: 18-30VAC or 100-240VAC 50/60Hz
Fan Relay Amps inductive: 5(3)A
Heat Relay Amps inductive: 1(0.5)A
Room temperature setting range: 5°C to 35°C (41°F to 95°F)
Modulating output voltage: 0 to 20mA or 0 to 10VDC
Accuracy:±0.2°F or ±0.1°C
Dimensions: 115mm×90mm×35.5mm

Product Dimensions

Modbus RTU Thermostat SAS908MTW Dimension Drawing

Product Installation

Modbus RTU Thermostat SAS908MTW Installation Diagram

Product Application Scenarios

The SAS908MTW is perfectly suited for Commercial Buildings, Hotels, and High-End Residential projects utilizing Direct Expansion (DX) HVAC systems and VRF units. This High Accuracy DX Unit Thermostat is mandatory for installations requiring precise zone temperature management and a professional, integrated interface.

Shopping Malls

Office-Building

luxury hotels

Partnership & OEM/ODM Support

Saswell is your reliable partner in the global HVAC market, committed to client success through rapid product development, robust technical service, and tailored Modbus Thermostat solutions.

Rapid OEM/ODM Customization

Leverage our 7 product platforms for fast, high-quality hardware and software customization, significantly accelerating your time-to-market.
Dedicated Technical Support

Access our expert R&D and engineering teams for in-depth system integration assistance, installation guidance, and advanced troubleshooting support.
Global Sales & After-sales Service

Benefit from our established worldwide distribution network and responsive after-sales team, guaranteeing prompt service and warranty fulfillment.