SAS921FCT Modbus RTU (RS485) Fan Coil Thermostat

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Key Functions

Seamless BMS Integration – Standard Modbus RTU RS485 Protocol

Centralized Control – Multi-Unit Network Management

Precise Comfort Control – High-Accuracy Temperature Regulation

Flush-Mount Architecture – Clean In-Wall Installation

Quick Installation – Contractor-Friendly Terminal Layout

Industrial Reliability – Stable Communication in Commercial Environments

Front view of SAS921FCT Modbus RTU RS485 fan coil thermostat

Left side view of SAS921FCT Modbus RTU RS485 fan coil thermostat

Right side view of SAS921FCT Modbus RTU RS485 fan coil thermostat

Home Fan Coil Thermostats SAS921FCT Modbus RTU (RS485) Fan Coil Thermostat

Product Overview

The SAS921FCT with Modbus RTU (RS485) delivers seamless BMS integration and centralized multi-unit control for commercial HVAC systems. Designed for flush-mount installation on surface-mounted FCUs, it ensures high-accuracy temperature regulation with contractor-friendly terminal layouts for quick deployment. Part of the FCT Series Fan Coil Thermostats collection, it serves as a core component for BMS-integrated commercial projects. Industrial-grade communication ensures stable performance in commercial environments.

Recommended reading: View FCT Series Fan Coil Thermostats

SAS921FCT Modbus RTU RS485 fan coil thermostat for fan coil unit systems

Product Features

Standard Modbus RTU RS485 Protocol

Native Modbus RTU (RS485) support enables direct integration with building management systems. Simplifies data exchange and central monitoring without proprietary gateways.
Multi-Unit Network Management

RS485 bus architecture connects up to 247 thermostats in a single network. Enables centralized scheduling, setpoint management, and group control from a single dashboard.
High-Accuracy Temperature Regulation

Precision temperature sensors and PID logic deliver consistent comfort with minimal deviation. Reduces energy waste while maintaining occupant satisfaction.

Clean In-Wall Installation

Standard flush-mount design fits 86x86mm junction boxes. Eliminates external enclosures and exposed wiring for a professional finish.
Contractor-Friendly Terminal Layout

Clearly labeled terminals and generous wiring space reduce installation errors and labor time. Simplifies retrofits and new construction projects alike.
Stable Communication in Commercial Environments

Industrial-grade RS485 transceivers with surge protection ensure reliable communication in electrically noisy environments. Minimizes data loss and system downtime.

Product Parameters

SAS921FCT Modbus RTU (RS485) Fan Coil Thermostat

Power Supply: 100-240VAC 50/60Hz

Fan Relay Amps Inductive: 8(5)A

Heat/Cool Relay Amps Inductive: 3(2)A

Room Temperature Setting Range: 5°C to 35°C

Dimensions: 88mm x 88mm x 15mm

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Wiring diagram for SAS921FCT Modbus RTU RS485 fan coil thermostat

Product Dimensions

Product dimension drawing for SAS921FCT Modbus RTU RS485 fan coil thermostat

Product Installation

Installation guide for SAS921FCT Modbus RTU RS485 fan coil thermostat

Product Application Scenarios

The SAS921FCT is designed for commercial office towers, educational campuses, and healthcare facilities requiring centralized BMS integration and multi-unit network management. Its native Modbus RTU (RS485) protocol enables direct connection to building management systems without proprietary gateways — making it an ideal wired communication backbone for large-scale HVAC deployments.

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