Terminal Designations

TerminalDescription
LLive
Ch/CcHeating close / Cooling close
W/YHeating open / Cooling open
NNeutral
GILow fan speed
GmMedium fan speed
GhHigh fan speed

Wiring

Wiring
  • Typical wiring for ON / OFF control in 2 pipe systems (VC4 valves)
    Wiring Induction
  • Typical wiring for ON / OFF control in 2 pipe systems (VC6 valves)
    Wiring Induction

Thermostat Installation

Thermostat Installation

Installer Parameters Table

NoParameterSetting
1System type0 = 2 pipe system, heat only
1 = 2 pipe system, cool only
2 = 2 pipe system, heat or cool, manual changeover (default)
9Temperature Scale0 = °F
1 = °C (default)
13Cycles Per
Hour value for HEATING
1 – 12 (default = 4)
14Cycles Per
Hour value for COOLING
1 – 6 (default = 3)
18Temperature display offset-2.0°C to +2.0°C increment 0.5°C/ -4°F to +4°F increment 1.0°F(default = 0°)
19Temperature display mode0 = Display room temperature (default)
1 = Display setpoint
20Heating range stops10 – 32°C (default maximum= 32°C) / 50 – 90°F (default maximum = 90°F)
21Cooling range stops10 – 32ºC (default minimum = 10ºC) / 50 – 90ºF (default minimum= 50ºF)
22Keypad lockout0 = All keys available (default)
1 = All keys locked

Documents / Resources

Honeywell T6812A1000 Digital Thermostat [pdf] Installation Guide
T6812A1000, Digital Thermostat

References

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