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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 

office, 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

Summary of Contents for T6861 Series

Page 1: ...k 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 manua...

Page 2: ...ERMOSTAT 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 SETU...

Page 3: ... 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 10o C to 21o C and default value is 18o C The value may change in ISU with step of 0 ...

Page 4: ...Installed on 3 x 3 Protection Class IP20 Environmental Operation temperature 18 49o C Conditions Shipping temperature 35 65o C 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 Pr...

Page 5: ...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 c...

Page 6: ...in 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 Coo...

Page 7: ...ng 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 9 Temperature 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 Fo...

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