Honeywell T6861-F

1
T6861-F Large LCD Digital Thermostat
230 VAC , Floating output
2-pipe fan coil control
Data sheet
Features
• Super modern appearance design, suitable for
ofce, hotel and residential building
• Horizontal and vertical model available for variant
application
• Slim design, direct installation on 86 size box
• Stylish and elegant blue/green backlight with white
• 2-pipe integrated into one unit with easy conguration
• Big LCD display with English and icons
• Easy to install and set-up
• Time on/off function
• Selectable room temperature or setpoint temperature
display
• Manual or automatic fan speed selection
• Remote sensor function
• Adjustment of display room temperature
• Temperature unit either
o
C or
o
F
• User setting can be kept when power off
• Freezing protection function available
• Lock or unlock keys or part of keys in Installer Set-up
• Heat and cool setpoint limitation for energy saving
Model summary
Application
T6861-F digital thermostats are designed for
application of 3-speed fan and oating valves in fan
coil system.
Including:
2-pipe cool only/heat only/manual changeover
Ventilation mode
Manual or automatic 3-speed fan control
oating valve control
Fan speed can be selected to automatic or manual
3-speed control mode.
In ventilation mode, fan only support manual speed
control.
Note: Horizontal models are taken as samples for display, operation and installation pictures shown in below parts.
Model
Horizontal/
Vertical
Backlight Color Ring
Time
on/off
2-pipe/
4-pipe
Power supply
(V)
Remote
sensor
Ventilation
Manual/
Automatic Fan
Remote
Setback
T6861H2WB-F Horizontal Blue White Y 2 230 Y Y Y N
T6861V2WB-F Vertical Blue White Y 2 230 Y Y Y N
T6861H2WG-F Horizontal Green White Y 2 230 Y Y Y N
T6861V2WG-F Vertical Green White Y 2 230 Y Y Y N

Honeywell T6861-F Specifications

General

Display	LCD
Frequency	50/60 Hz
Mounting	Wall Mount
Control Mode	Heating and cooling
Operating Voltage	24V
Output	Relay Output
Fan Speed	Auto
Accuracy	±1°F
Programmable Periods	Up to 4 periods per day
Weight	Approx. 150g

Summary

Application

Features

Mechanical Design

Thermostat Appearance

Details the physical design and visual elements of the thermostat.

LCD Display

Explains the various icons and indicators displayed on the thermostat's LCD screen.

Fan Operation

Function

Floating Valve Control

Describes how the thermostat manages floating valve control for temperature maintenance.

Temperature Display

Explains settings for displaying room or setpoint temperature.

Time OnOff

Details the procedure for setting timed on/off functions for the thermostat.

Freezing Protection Mode

Backlight

Keypad Lock

Operating Modes

Comfort Mode

Describes operation in comfort mode with setpoint adjustment capabilities.

Ventilation Mode

Explains thermostat operation in ventilation mode with fan speed control.

Remote Temperature Sensor

Details how the thermostat uses an external remote sensor for temperature readings.

OnOff Mode

Technical Specification

Terminal Designations

Wiring Diagram

Application 1: 2 pipes heat only wiring diagram

Illustrates the wiring connections for a 2-pipe heating-only system.

Application 2: 2 pipes Cool only wiring diagram

Illustrates the wiring connections for a 2-pipe cooling-only system.

Application 3: 2 pipes 1 stage Heat or 1 stage Cool MCO wiring diagram

Illustrates wiring for 2-pipe, 1-stage heat/cool configurations.

Installation & Commissioning

Unsuitable Installation Locations

Lists locations to avoid for accurate thermostat performance and readings.

Wire Insertion Procedure

Instructions for pulling and inserting wires into the terminal block.

Installer System Test

Installer Set-Up (ISU) Setting

Setup Function Settings & Options

Troubleshooting Tips

Dimension