Honeywell TFM228N/U Thermostat – ON/OFF Control for 2-Pipe FCU Systems

Posted on: 11/12/2025

Honeywell TFM228N/U thermostat distributed by DLK, offering ON/OFF control and 3 fan speeds for 2-pipe FCU systems with ±0.5°C accuracy and easy installation.

Overview of the Honeywell TFM228N/U Thermostat

The Honeywell TFM228N/U thermostat is a digital ON/OFF thermostat designed for 2-pipe FCU systems with 3-speed fan control. It features a clear LCD interface, stable temperature regulation, and high compatibility with standard HVAC installations.
The product is officially imported and distributed by DLK – DLK TRADING SERVICE COMPANY LIMITED in Vietnam.

How the Honeywell TFM228N/U Thermostat Operates

The thermostat uses an ON/OFF SPST output to control the water valve and FCU fan. Its internal microprocessor applies an optimized FUZZY-based control method to maintain room temperature close to the setpoint with an accuracy of ±0.5°C.
A wide power range 90–264 VAC ensures stable operation, while the LCD provides clear visibility of room temperature, fan speed, and mode selection. This makes installation and daily operation straightforward for technicians and end-users.

Typical Applications Across Industries

Commercial buildings and offices

Used for local FCU control, allowing precise zone temperature management and smooth integration into HVAC/BMS systems.

Hotels and hospitality

Installed in guestrooms for intuitive temperature adjustment. The clear LCD ensures guests can operate the thermostat easily without confusion.

Industrial facilities

Maintains stable environmental conditions for staff rooms, inspection areas, or controlled workspaces that require reliable thermal regulation.

Data centers and server rooms

Ensures stable cooling performance for IT equipment by providing dependable ON/OFF control for perimeter FCUs.

Benefits of the Honeywell TFM228N/U Thermostat

±0.5°C temperature accuracy for stable comfort
3-speed fan control to optimize airflow and energy use
Clear LCD interface for fast configuration
Long service life and durable mechanical output cycles
Fully compatible with standard ON/OFF valves and FCU fans
Ideal for both new installations and retrofit projects

Key Technical Specifications (from datasheet)

Specification	Value
Power Supply	90–264 VAC, 50/60Hz
Temperature Setting Range	5–45°C
Display Range	0–60°C
Accuracy	±0.5°C (at 25°C)
Control Output	SPST ON/OFF
Fan Speeds	Low / Medium / High
Sensor Type	NTC 10k
Operating Conditions	5–45°C, 5–95% RH