Honeywell T6861 Series Data Sheet / Manual Download Page 5

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. 

APH07CH04 

R2001EN

Install the thermostat about 5 feet (1.5m) above the 

floor 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 

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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