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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 Configuration identification code (major)

 

74 Configuration identification code (minor)

 

75 Production configuration date code (week)

 

76 Production configuration date code (year)

APH07CH04 

R2001EN

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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