Honeywell T6861 Series Instruction Manual

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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 oC or oF
• 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.
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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

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Cycle per hour (CPH)
In order to get a more accurate temperature control,
CPH function may enable the thermostat to open
the valve for several times per hour even the
temperature is close to setpoint (difference less
than ½ P-band). The default value is 4 for heating
and 3 for cooling and can be changed in Installer
Set-Up process.
Temperature display
The displayed temperature can be set to acquired
room temperature or setpoint. The setting can be
made during Installer Set-Up process.
Room temperature and scetornt can be displayed
simultaneously.
Mechanical design
Thermostat appearnce
LCD display
Function
Valve control
Thermostat acquires the room temperature via its
integrated sensor or external temperature sensor
and maintains the setpoint by delivering on/off valve
control commands output.
Fan Operation
DIGITAL DISPLAY
FAN BUTTON
POWER BUTTON
MODE BUTTON
UP BUTTON
DOWN BUTTON
INDICATES ROOM TEMPERATURE
CURRENT FAN SETTING
INDICATES THERMOSTAT IS
OFF
CURRENT
MODE SETTING
INDICATES THERMOSTAT
IS SET TO TIME ON/OFF
INDICATES THE KEYPAD
IS ENTIRELY OR PARTLY
LOCKED
INDICATES THERMOSTAT IS
IN FREEZING PROTECTION MODE
INDICATES WHETHER
THERMOSTAT IS IN OCCUPIED
OR NOT
INDICATES THERMOSTAT IS
"CALLING" FOR HEAT OR COOL
INDICATES THE LENGTH
OF TIME ON/OFF
INDICATES THE HEAT/COOL
SETPOINT
INDICATES INSTALLER TEST
INDICATES INSTALLER SETUP
INDICATES THE SETPOINT
PRESS THE MODE BUTTON TO SELECT
HEAT, COOL, AUTO OR VENT
PRESS THE FAN BUTTON TO SELECT LOW,
MED, HIGH OR AUTO
Fan can be selected as manual or automatic
3-speed operation. In Manual mode, the fan
is switched to the selected speed via control
output Gh, Gm, Gl. While in automatic mode, fan
speed depends on the difference between room
temperature and setpoint. When room temperature
reaches setpoint, valve will be closed and
meanwhile, fan will be closed either.
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Fan speed ramping control algorithm
-4F
-2F
2F
4F
COOLHEAT
Fan speed is high or off
Fan speed is medium or off
Fan speed is low or off
Fan speed is low or off
Fan speed is medium or off
Fan speed is high or off
Setpoint
Difference between RT and SP

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Backlight
Any key press will activate the backlight. Backlights
will timeout 8 seconds after last key press. When
in Installer Set-up and Installer test mode, the
backlight will timeout 60 seconds after last key
press.
Keypad lock
Keypad lock can be set in ISU with default status
is all keys available. You may change into mode
button locked out, Fan and mode buttons locked out
and All buttons locked out by changing the ISU.
TEMPERATURE
SETTING
PRESS THIS BUTTON TO
RAISE THE TEMPERATURE
SETTING
PRESS THIS BUTTON TO
LOWER THE TEMPERATURE
SETTING
Ventilation mode
Press mode button to enter ventilation mode. In
ventilation mode, no output for valve while the fan
will operate according to selected fan speed.
Energy saving mode
A potential-free dry contact (such as hotel key
card) or button press (pressing mode button for
continuous 3 seconds) can activate the energy
saving mode with icon appearing on screen.
The dry contact can be selected as normal open or
normal close type in ISU.
If activated by dry contact, all buttons will be locked
except the multi-key for ISU. If energy saving is
activated by button press, then any following button
press will stop energy saving mode.
For heating mode, if the energy saving function is
enabled, the setpoint will change to remote setback
heating setpoint. The range of remote setback
heating setpoint is from 10oC to 21oC and default
value is 18oC. The value may change in ISU with
step of 0.5oC.
For cooling mode, if the energy saving function is
enabled, the setpoint will change to remote setback
cooling setpoint. The range of remote setback
cooling setpoint is from 22oC to 32oC and default
value is 26oC. The value may change in ISU with
step of 0.5oC.
Operating modes
The following operating modes are available:
Comfort mode
In comfort mode, the setpoint can be changed by
pressing up and down button. Different applications
include cool only, heat only and manual heat/cool
changeover.
INDICATES THERMOSTAT
HAS BEEN SET TIME OFF
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Time on/off
If the thermostat is off, hold power button for 3
seconds, system will be time on mode. If the
thermostat is on, hold power button for 3 seconds,
system will be time off mode.
The setting range is from 0 to 12 hours. The step is
0.5 hour with the default time is 0.

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Freezing protection mode
Freezing protection can be selected as disabled
(default) or enabled. In freezing protection mode
(no such mode in cool only application), when
thermostat is in OFF mode while the acquired
temperature is below 6oC, the thermostat will start
heat mode until the temperature rises to 8oC or the
thermostat is turned on.
Technical specication
Power supply 230 ± 10% VAC
Frequency 50/60Hz
Control algorithm PI, On/off output
Accuracy +/-1oC at 21oC
Rating capacity For 220V power supply:
4(3)A for fan load, 2(1)A for zone
valve
Cycle times 100,000 times
Setpoint range 10~32oC
Display range 0~37oC
Installation Installed on 3" x 3"
Protection Class IP20
Environmental Operation temperature -18~49oC
Conditions Shipping temperature -35~65oC
Relative humidity 5~90%
Terminal Designations
Terminal Description
L AC Power
N AC Ground
W Heating open
Y Cooling open
Gh High speed fan relay
Gm Medium speed fan relay
Gl Low speed fan relay
Sc Ground for remote sensor and remote setback
RSB Remote set back
On/off mode
Pressing power button can switch between on and
off mode.
INDICATES THERMOSTAT
HAS BEEN SET TIME OFF
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Fig.2.2 Typical wiring for 3-wire control in 2 pipe heating only (VC6013)
Wiring diagrams
Application 1: 2 pipes heat only wiring diagram
Fig.2.1 Typical wiring for ON/OFF control in 2 pipe heating only (VC4013)
1
2
3
4
5
6
7
8
9
N
L
Heat valve
Fan
Remote Setback
N
L
1
2
3
4
5
6
7
8
9
Heat valve
Fan
Remote Setback

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Application 3: 2 pipes 1 stage Heat or 1 stage Cool
MCO wiring diagram
Application 2: 2 pipes Cool only wiring diagram
1 Pull wires through wire hole.
Loosen screw terminals, insert wires into terminal
block, then retighten screws.
2 Push the Power box into the junction box.
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Install the thermostat about 5 feet (1.5m) above the
oor in an area with good air circulation at average
temperature.
Do not install in locations where the thermostat can
be affected by:
• Drafts or dead spots behind doors and in corners
• Hot or cold air from ducts
• Sunlight or radiant heat from appliances
• Concealed pipes or chimneys
• Unheated/uncooled areas such as an outside wall
behind the thermostat
Installation & Commissioning
Fig.2.3 Typical wiring for ON/OFF control in 2 pipe cooling only (VC4013)
Fig.2.4 Typical wiring for 3-wire control in 2 pipe cooling only (VC6013)
Fig.2.5 Typical wiring for ON/OFF control in 2 pipes 1H1C (VC4013)
Fig.2.6Typical wiring for 3-wire control in 2 pipes 1H1C (VC6013)
1
2
3
4
5
6
7
8
9
N
L
Cool valve
Fan
Remote Setback
N
L
1
2
3
4
5
6
7
8
9
Cool valve
Fan
Remote Setback
1
2
3
4
5
6
7
8
9
N
L
Cool valve
Fan
Remote Setback
N
L
1
2
3
4
5
6
7
8
9
Fan
valve
Remote Setback

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3 Place Back cover over junction box, insert and
tighten mounting screws.
4 Insert the cable into connector on circuit board of
thermostat.
5 Align 4 tabs on the Back cover with corresponding
slots on the back of the thermostat, and then push
it until the thermostat snaps in place.
Installer Set-Up (ISU) setting
Press and simultaneously for 3 seconds to
enter ISU as below:
Number
Setting
Press or to change settings
Press to advance to next function
Press and hold and buttons 3 seconds to
exit and save settings
Installer system test
After completing the installer setup above, press the
button again to begin a system test
Follow the procedure below to test the heating and
cooling and fan system.
System
System test No.
Press and hold and buttons 3 seconds to enter
test mode.
Press or button to change system status.
Press button to advance to next test number.
Press and button hold to terminate system test
at any time.
System Test System Status
10 Heat 0 Heat turn off.
1 Heat turns on.
30 Cool 0 Cool off.
1 Cool on.
40 Fan 0 Fan off
1 Low speed Fan on
2 Medium speed Fan on
3 High speed Fan on
70 Thermostat information(for reference only)
71 Software revision number (major)
72 Software revision number (minor)
73 Conguration identication code (major)
74 Conguration identication code (minor)
75 Production conguration date code (week)
76 Production conguration date code (year)
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Troubleshooting Tips
Dimension
Horizontal model
Vertical model
If… Then…
Heating system
does not turn
on.
♦ Set the mode to Heat by pressing the Mode button.
♦ Check that the heat temperature setting is set above
the room temperature and “Heat On” shows solidly
in the display.
♦ Wait ve minutes for the heating system to respond.
Cooling system
does not turn
on.
♦ Set the mode to Cool by pressing the Mode button.
♦ Check that the cool temperature setting is set below
the room temperature and “Cool On” shows solidly
in the display.
♦ Wait ve minutes for the cooling system to respond.
The fan doesn’t
work.
♦ Check whether the Fan mode is set to Auto
♦ Check whether the heating or cooling system works.
The Mode
button doesn’t
work.
♦ Check whether the keypad is locked or not.
♦ Check whether the system is working in Energy
saving mode.
♦ Check whether the thermostat is off.
The Fan button
doesn’t work.
♦ Check whether the keypad is locked or not.
♦ Check whether the system is working in Energy
saving mode.
♦ Check whether the thermostat is off.
The Up or
Down button
doesn’t work.
♦ Check whether the keypad is locked or not.
♦ Check whether the system is working in Energy
saving mode.
♦ Check whether the thermostat is off.
Setup Function Settings & Options
Number Description Possible Options
1 System type
0 Heat only
1 Cool only
2 two pipes 1H1C manual (Default)
9Temperature
scale
0 ºF
1 ºC(Default)
10 Fan control type
0 Cycle only
1 Constant only
(3 speed: Low->Med->High-> Low)
2 User can choose Cycle or Constant
(3 speed: Low->Med->High->Auto-> Low)
(Default)
13 CPH value For
Heat
1
2
3
4 (default)
5
6
7
8
9
10
11
12
14 CPH value For
Cool
1
2
3(default)
4
5
6
18
Display
Temperature
adjustment
-2 ºC(-4 ºF)
-1.5 ºC(-3 ºF)
-1 ºC(-2 ºF)
-0.5 ºC(-1 ºF)
0 ºC(0 ºF) (default)
0.5 ºC(1 ºF)
1 ºC(2 ºF)
1.5 ºC(3 ºF)
2 ºC(4 ºF)
19 Temperature
Display mode
0 display Room Temperature
1 display Setpoint
2 display both (default)
20 Heating Range
Stops 10-32 ºC default 32 ºC (50-90 ºF default 90 ºF)
21 Cooling Range
Stops 10-32 ºC default 10 ºC (50-90 ºF default 50 ºF)
22 Keypad Lockout
0 All keys available(default)
1 System button Locked out
2 Fan and System button Locked out
3 All buttons locked out
23 Remote setback
enable method
0 Hotel card NO
1 Hotel Card NC
2 Button (Default)
24 Remote setback
heating setpoint
Range 10-21ºC Default : 18 ºC
(Range 50-70ºF Default : 64)
25 Remote setback
cooling setpoint
Range 22-32ºC Default : 26 ºC
(Range 72-90 ºF Default : 79 ºF)
27 Freeze Protection 0 Disabled (default)
1 Enabled
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