Honeywell
T6861V2WB
T6800 Series • HVAC Controller
Quick Info
Type
HVAC
Application
FCU
Probe Inputs
1
Relay Outputs
4
Communication
Modbus (model dependent)
Panel Size
120x120 wall mm
Output Functions
R1
Fan Low
R2
Fan Med
R3
Fan High
R4
Valve
Fan coil thermostat with modulating valve output
Technical Specifications
Display & Interface
| Display Type | LCD |
| Display Digits | 3 |
| Buttons | 5 |
| LED Indicators | Heat, Cool, Fan |
Power Supply
| Voltage | 220-240V AC |
| Voltage Range | 195-264V AC |
| Frequency | 50/60Hz |
| Power Consumption | 5VA |
Sensor Inputs
| Probe Inputs | 1 |
| Probe Type | NTC (internal) |
| Temp Range | 0 to 40°C |
| Accuracy | ±0.5°C |
Relay Outputs
| Relay Outputs | 4 |
| Relay Rating | 3A/250VAC |
Physical
| Panel Size | 120x120 wall mm |
| Depth | 38 mm |
| IP Rating | IP30 |
| Weight | 200 g |
Operating Conditions
| Operating Temp | 0 to 50°C |
| Storage Temp | -20 to 60°C |
Wiring Terminals
| Terminal | Function | Type | Wire Color |
|---|---|---|---|
| L | Power L | Input |
brown
|
| N | Power N | Input |
blue
|
| FL | Fan Low | Output |
green
|
| FM | Fan Med | Output |
yellow
|
| FH | Fan High | Output |
red
|
| V | Valve | Output |
orange
|
| AO | 0-10V Valve | Output |
purple
|
Important: Always disconnect power before wiring. Verify terminal numbers with the actual controller label before connecting.
Parameter Settings
| Code | Parameter | Range | Default | Description |
|---|---|---|---|---|
| SP | Setpoint | 10 to 35 | 22 °C | Room temperature setpoint |
| dT | Differential | 0.5 to 4 | 1 °C | Control band |
| Md | Mode | 0=Auto, 1=Heat, 2=Cool, 3=Fan | 0 | Operating mode |
| FS | Fan Speed | 0=Auto, 1=L, 2=M, 3=H | 0 | Fan speed selection |
| VT | Valve Type | 0=On/Off, 1=Modulating | 1 | Valve control type |
| dZ | Dead Zone | 0 to 5 | 1 °C | Neutral zone |
Error Codes
E1
Sensor fault
Solution: Replace thermostat
E3
EEPROM error
Solution: Factory reset
Frequently Asked Questions
Modulating provides smoother control with 0-10V signal
Both supported, configure VT parameter
Alternative Models (Cross Reference)
T6861H2WB
Carel FCR3
Danfoss ERC 214
Manufacturer Information
Brand: Honeywell
Country: USA