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Honeywell T6861 Series User Manual

Honeywell T6861 Series
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T6861 Series Large LCD Digital Thermostat
220 VAC
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 3" x 3" size box
Stylish and elegant blue/green backlight with blue/
green/ white colour ring
• Big LCD display with English and icons
• Easy to install and set-up
• Time on/off function
Selectable room temperature or setpoint display
• Manual or automatic fan speed selection
Energy saving mode activation by button press or
dry contact (key card)
• Cycle per Hour (CPH) 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 digital thermostats are designed for
application of 3-speed fan and valves in fan coil
system.
Including:
2-pipe cool only/heat only/manual changeover
Ventilation mode
Manual or automatic 3-speed fan control
Water valve control
Fan speed can be selected to automatic or manual
3-speed control mode.
In ventilation mode, fan only support manual speed
control.
APH07CH04
-
R2001EN
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
Energy
Saving
Ventilation
Manual/
Automatic Fan
T6861H2BB-M
T6861H2WB-M
Horizontal Blue
Blue
White
Y 2 220 Y Y Y
T6861V2BB-M
T6861V2WB-M
Vertical Blue
Blue
White
Y 2 220 Y Y Y
T6861H2GG-M
T6861H2WG-M
Horizontal Green
Green
White
Y 2 220 Y Y Y
T6861V2GG-M
T6861V2WG-M
Vertical Green
Green
White
Y 2 220 Y Y Y

Questions and Answers:

Honeywell T6861 Series Specifications

General IconGeneral
Frequency50/60 Hz
OutputRelay
DisplayLCD
CompatibilityCompatible with most HVAC systems
Temperature Setting Range10 to 32°C
Accuracy±1°C
Fan SpeedHigh, Medium, Low, Auto
MountingWall-mounted
Backup BatteryNo
Dimensions86 x 86 x 15 mm
Weight150 g

Summary

Product Application and Features

Application Overview

Details the intended applications for T6861 digital thermostats in fan coil systems.

Key Product Features

Lists the main features and benefits of the T6861 series thermostat.

Mechanical Design and Core Functions

Thermostat Appearance

Details the physical design and components of the thermostat.

LCD Display Explained

Describes the various icons and indicators shown on the thermostat's LCD screen.

Functional Operations

Explains valve control, temperature display, and Cycle per Hour (CPH) functions.

Operational Modes and Controls

Time On/Off and Backlight

Details the time-based operation and backlight activation.

Keypad Lockout

Explains how to lock or unlock the thermostat's keypad.

Operating Modes

Covers Comfort, Ventilation, and Energy Saving modes.

Advanced Functions and Technical Details

Freezing Protection Mode

Describes the thermostat's protection against freezing.

On/Off Mode Control

Explains how to switch the thermostat between on and off modes.

Terminal Designations and Wiring

Lists terminal functions and provides wiring diagrams.

Installation and Commissioning

Wiring Diagrams

Illustrates typical wiring for various 2-pipe applications.

Installation Guidelines

Provides instructions and advice for installing the thermostat.

System Testing and Setup

Installer System Test

Procedure to test heating, cooling, and fan system operation.

Installer Set-Up (ISU) Settings

Guide for configuring thermostat settings during installation.

Configuration, Troubleshooting, and Dimensions

Setup Function Settings

Details available settings and options for thermostat configuration.

Troubleshooting Tips

Provides solutions for common operational issues.

Product Dimensions

Shows physical dimensions for horizontal and vertical models.

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