T29MTW Wall‑Mount Modbus RS485 DX Thermostat

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Key Functions

Equipment Protection – Compressor Short-Cycle Delay & Multi-Stage Staggering

System Versatility – Configurable Single/Dual-Stage DX & Fan Coil Modes

BMS Integration – RS485 Modbus with 254 Addressable Nodes

Easy Installation – Wall-Mounted Design with Quick Terminal Access

Remote Control – Mobile App Integration for Monitoring & Adjustment

Precise Comfort – 0.1°C Display Accuracy & 3-Speed Fan Management

Front view of T29MTW wall-mount Modbus RS485 DX thermostat

Left side view of T29MTW wall-mount Modbus RS485 DX thermostat

Right side view of T29MTW wall-mount Modbus RS485 DX thermostat

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Product Overview

The T29MTW Wall-Mount Modbus RS485 DX Thermostat is a digital controller for DX systems, fan coils, and heat pumps in commercial buildings. As part of the MTW Series DX Thermostats, it offers RS485 Modbus RTU for BMS integration, standalone scheduling, and wall-mount design. This series enables centralized monitoring, equipment protection, and energy efficiency across multi-zone installations.

Recommended reading: View MTW Series DX Thermostats

T29MTW wall-mount Modbus RS485 DX thermostat for DX system applications

Product Features

Compressor Short-Cycle Delay & Multi-Stage Staggering

Enforces minimum off-time to prevent wear. Staged startup eliminates current inrush and reduces mechanical stress.
Configurable Single/Dual-Stage DX & Fan Coil Modes

Field-selectable operation modes. No extra modules needed, cutting inventory and commissioning time.
RS485 Modbus with 254 Addressable Nodes

Native Modbus RTU, interoperable with major BMS brands. ESD-protected transceiver ensures reliable long-distance communication.

Wall-Mounted Design with Quick Terminal Access

Rugged housing, clear terminal labels, and captive screws speed installation. Detachable cover allows fast DIP-switch access.
Mobile App Integration for Monitoring & Adjustment

App enables remote parameter tuning, real-time monitoring, and fault alerts, enabling rapid response without on-site presence.
0.1°C Display Accuracy & 3-Speed Fan Management

0.1°C resolution and 3-speed fan (Auto/Low/Med/High) ensure precise comfort. Auto mode avoids full-speed operation under partial loads, saving energy.

Product Selector

Model No.

Heat/cool

Cool only

Pipe

Speed fan

Programmable

Window card

Room card

External Sensor

BACnet RTU

WIFI

Power

Manual

T29MTW-7-S-BACnet

√

2/4

1/3

√

220/24VAC

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Product Parameters

T29MTW Wall‑Mount Modbus RS485 DX Thermostat

Power Supply: 100-240VAC 50/60Hz；24(18~30) VAC 50/60Hz
Realy for fan: 8(5)A
Standby current: <1W
Heat/Cool Relay Amps inductive: 3(2)A
Temperature setting range: 0°C to 50°C
Accuracy: 0.1°C
Storage temperature: -10°C to 60°C
Operation temperature: 0°C to 50°C
Dimensions: 135mm×92mm×27.5mm

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Wiring diagram for T29MTW wall-mount Modbus RS485 DX thermostat

Product Dimensions

Product dimension drawing for T29MTW wall-mount Modbus RS485 DX thermostat

Product Installation

Installation guide for T29MTW wall-mount Modbus RS485 DX thermostat

Product Application Scenarios

The T29MTW fits office towers, hotels, healthcare, and campuses requiring BMS oversight and local control. It integrates into Modbus networks as part of the MTW Series - ideal for multi‑tenant buildings, guestroom energy optimization, and retrofits that keep existing wiring while upgrading to smart control.