Honeywell
T6812DP08
T6812 Series • HVAC Controller
Quick Info
Type
HVAC
Application
FCU
Probe Inputs
1
Relay Outputs
5
Panel Size
86x86 mm
Output Functions
R1
Heat Valve
R2
Cool Valve
R3
Fan Low
R4
Fan Med
R5
Fan High
Large LCD display thermostat with backlight
Technical Specifications
Display & Interface
| Display Type | LCD |
| Display Digits | 3 |
| Buttons | Touch |
| LED Indicators | Heat, Cool, Fan, Auto |
Power Supply
| Voltage | 230V AC |
| Voltage Range | 220-240V AC |
| Frequency | 50/60Hz |
| Power Consumption | 3VA |
Sensor Inputs
| Probe Inputs | 1 |
| Probe Type | NTC (built-in) |
| Temp Range | 0 to 50°C |
| Accuracy | ±0.5°C |
Relay Outputs
| Relay Outputs | 5 |
| Relay Rating | 3A/250VAC |
Physical
| Panel Size | 86x86 mm |
| Depth | 28 mm |
| IP Rating | IP20 |
| Weight | 120 g |
Operating Conditions
| Operating Temp | 0 to 45°C |
| Storage Temp | -10 to 55°C |
Wiring Terminals
| Terminal | Function | Type | Wire Color |
|---|---|---|---|
| L | Power L | Input |
brown
|
| N | Power N | Input |
blue
|
| H | Heat Valve | Output |
red
|
| C | Cool Valve | Output |
blue
|
| FL | Fan Low | Output |
green
|
| FM | Fan Medium | Output |
green
|
| FH | Fan High | Output |
green
|
| COM | Common | Output |
white
|
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 | 5 to 35 | 22 °C | Room setpoint |
| MD | Mode | 0=Off, 1=Cool, 2=Heat, 3=Auto | 3 | Operating mode |
| FS | Fan Speed | 0=Auto, 1=Low, 2=Med, 3=High | 0 | Fan control |
| dB | Deadband | 1 to 4 | 2 °C | Neutral zone |
| CF | Temp Unit | 0=°C, 1=°F | 0 | Display unit |
| BL | Backlight | 0=Off, 1=On, 2=Auto | 2 | LCD backlight |
Error Codes
E1
Sensor fault
Solution: Replace unit - built-in sensor
Frequently Asked Questions
Set BL parameter to 1 for always on, 2 for auto (touch activated)
Yes, in installer menu set SL (low) and SH (high) limits
Alternative Models (Cross Reference)
Carrier 33CS2PP
Trane TCONT
Manufacturer Information
Brand: Honeywell
Country: USA