Honeywell Communicating Fan Coil Thermostat Instruction Manual

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TF428WNM/U  

Communicating Fan Coil Thermostat  

SPECIFICATION DATA  

Specifications  

Physical Layer  

Protocol  

Baud rate  

Parity  

EIA485  

Modbus RTU  

4800/9600(Default)/19200  

None  

Error checking mechanism CRC  

Rated voltage & Frequency 220/230VAC, 50/60Hz  

Power consumption  

Control  

Accuracy  

Auto cycle times  

Manual cycle times  

Protection class  

Setpoint range  

Display range  

<2W  

PI, On/off output  

±1°C at 21°C  

100,000 times  

10,000 times  

IP20  

10 ~ 32°C  

0 ~ 37°C  

Ambient operating limits  

Ambient storage limits  

Humidity limits  

Action Type:  

0~ 49°C  

-30 ~ 60°C  

5~90% RH, non-condensing  

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Pollution Degree  

Protection against electric shock class Class II  

Electronic control software class Class A  

Rated impulse voltage:  

Maximum temperature  

For relay wiring  

Wire sectional area  

(Recommendation)  

Applied altitude up to 2000m above sea level  

Rating capacity  

Working current for the whole product : 4(3)A  

4A: When the load of the thermostat is resistance  

3A: When the load of the thermostat is inductance  

For Fan load 3(2)A  

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General  

The TF428WNM/U communicating thermostat is designed for  

2500V  

3-speed fan and valve control in fan coil system, including:  

155°C  

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2-pipe cooling only/heating only/manual changeover  

4-pipe cooling/heating manual/automatic changeover  

Ventilation mode  

Manual or automatic 3-speed fan control  

Water valve on/off control  

1.0~1.5mm²  

The TF428WNM/U is available in Modbus RTU protocol and  

can be easily integrated into building automation system.  

3A:when the load is resistance;  

2A:When the load is inductance  

For Valve load 2(1)A  

2A: when the load is resistance;  

1A: when the load is inductance  

The valve need have overtravel-limit organ to turn off the  

load.  

Features  

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RS485 interface in Modbus RTU slave mode  

Memorized time off  

Cycle Per Hour (CPH)  

Random startup  

LCD display with simple user interface  

Room temperature or setpoint temperature display  

selectable  

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Manual or automatic fan speed selectable  

Temperature units in either °C or °F  

User setting can be stored when power loss  

Freeze protection function available  

Keypad lock options  

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E&ES-CDS-CT01-165-E01-EN  

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General	Details
Name	Honeywell Communicating Fan Coil Thermostat Instruction Manual
Make	Honeywell
Language	English
Filetype	PDF (Download)
File size	0.39 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• Honeywell

Honeywell Communicating Fan Coil Thermostat Instruction Manual Overview

Summary of Contents

• Page 1: Communicating Fan Coil Thermostat The TF428WNM/U communicating thermostat is designed for 3-speed fan and valve control in fan coil system. The TF428WNM/U is available in Modbus RTU protocol and can be easily integrated into building automation system. Features include RS485 interface in Modbus RTU slave mode, LCD display with simple user interface, and manual or automatic fan speed selectable. Setpoint range is 10 ~ 32°C and display range is 0 ~ 37°C. Power consumption is less than 2W with a control accuracy of ±1°C at 21°C. Protection class is IP20, and the ambient operating limits are 0~49°C. Humidity limits are 5~90% RH, non-condensing. User setting can be stored when power loss occurs, and freeze protection function is available. Keypad lock options are included for added security.
• Page 2: Model selection Model number Backlight Application Power supply Ventilation Mode Package Dimensions (mm) Product design
• Page 3: Backlight function allows the user to turn on the backlight by pressing any key, which will timeout after 8 seconds of inactivity. In ISU or installation test mode, the backlight will timeout after 60 seconds. The thermostat measures room temperature via an integrated sensor and maintains the setpoint through on/off valve control commands. Fan settings can be selected as manual or automatic 3-speed operation, with manual mode allowing selection of high, medium, or low speeds. In auto mode, fan speed adjusts based on the difference between room temperature and setpoint. Keypad lockout can be configured in ISU or over Modbus, with various options for locking buttons. The displayed temperature can be set to show either room temperature or setpoint during the ISU process. The Cycle Per Hour (CPH) function enables the thermostat to open the valve multiple times per hour as the room temperature approaches the setpoint. Comfort mode allows changes to setpoint and fan speed through corresponding buttons, applicable for various heating and cooling configurations. The time off feature automatically turns off the thermostat after a selectable duration, with a range from 0 to 12 hours.
• Page 4: Ventilation mode allows the fan to operate at the selected speed without output for the valve. Freeze protection mode can be enabled or disabled and activates heating when the temperature is below 6°C. The thermostat will heat until the temperature rises to 8°C in freeze protection mode. The unit can be installed in a standard 86 size junction box. Screws must be tightly locked to prevent wire breakage from terminals. The mounting box and wall temperature should be within the operating range.
• Page 5: Wiring diagram Terminal designations Terminal description Modbus 485 Low speed fan Medium speed fan High speed fan 4-pipe application Note: when in 4-pipe application, the thermostat cannot be connected with Honeywell VC6013/VN6013 series motorized valve
• Page 6: ISU (Installation Setup) Press and hold the “mode” and “up” buttons together for more than 3 seconds to enter or exit ISU. Change the ISU code by pressing the “mode” button and then change the option setting by pressing the “up” and “down” button. All keys are available (Default). Mode button locked out. Fan and mode buttons locked out. All buttons locked out except power button. Heating only. Cooling only. Enabled (Default). Previous status (Default).
• Page 7: Modbus Address Table When the thermostat is integrated into building automation system, please make configuration refer below list. Power Switch Room Temperature Setpoint Fan Speed System Mode V1 Valve Status V2 Valve Status Error Code Fan Status Modbus Address
• Page 8: Registers Parameters Keypad Lockout All keys are available (Default); Mode button locked out; Fan and mode buttons locked out; All buttons locked out except power button; All buttons locked out Freeze Protection Disabled; Enabled (Default) Power Recovery Status OFF; Previous Status (Default) Modbus Baud Rate 9600 (Default); 4800; 19200 Remain time to turn off The parameters are registers, 16 bit integer.