
The MTW Series DX Thermostats - a unified family of digital thermostats for DX rooftop units, split systems, and fan coil units (FCUs) in commercial and hospitality settings. The series shares consistent control logic and protection across both system types, with models differentiated by communication protocol, interface, and added features.







| Dimension | DX Systems (RTU / Split Systems) | FCU Systems (Fan Coil Units) |
| Core Actuator | Multi-stage compressors (staged on/off) | Electric on/off valves (open/close) |
| Fan Management | Fixed-speed fan interlock or 3-speed independent control (depending on equipment configuration) | 3-speed independent control (Auto/Low/Med/High) |
| Protection Logic | Compressor time-delay protection & multi-stage staggering | Valve anti-short-cycle (deadband setting) |
| Energy Strategy | Staged call + differential setting (avoid frequent loading) | Valve on/off optimization + fan auto-speed modulation |
Pro Tip from SASWELL HVAC Engineers
Native BMS Protocols
Modbus RTU (T29MTW, SAS922XMTW optional) and BACnet MS/TP (SAS965MTW). Modbus supports 254 nodes per daisy-chain; BACnet scales to multi-building.
Mobile App & Remote Access
Real-time monitoring, parameter adjustment, and fault alerts via mobile connectivity. No on-site presence required.
OTA Firmware Updates
Built-in OTA on SAS965MTW for remote upgrades. No on-site refresh needed.
Contact our friendly customer service team for any questions, concerns, or suggestions. We'd love to hear from you.
Headquarters Hotline: +86 755 61218391 Headquarters Hotline +86 755 61218391
Headquarters Email: info@saswell.com
Tech Support Email: support@saswell.com
