Honeywell T6812A1000 Digital Thermostat Installation Guide

Honeywell T6812A1000 Digital Thermostat Installation Guide

CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.
Disconnect power before removing cover.

Terminal Designations

Terminal Description

L

 Live

Ch/Cc

 Heating close / Cooling close

W/Y

 Heating open / Cooling open

N

 Neutral

GI

 Low fan speed

Gm

 Medium fan speed

Gh

 High fan speed

Wiring

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

Thermostat Installation

Installer Parameters Table

N o Parameter Setting
1 System type 0 = 2 pipe system, heat only
1 = 2 pipe system, cool only
2 = 2 pipe system, heat or cool, manual changeover (default)
9 Temperature Scale 0 = °F
1 = °C (default)
13 Cycles Per
Hour value for HEATING		 1 – 12 (default = 4)
14 Cycles Per
Hour value for COOLING		 1 – 6 (default = 3)
18 Temperature display offset -2.0°C to +2.0°C increment 0.5°C

/ -4°F to +4°F increment 1.0°F

(default = 0°)

19 Temperature display mode 0 = Display room temperature (default)
1 = Display setpoint
20 Heating range stops 10 – 32°C (default maximum

= 32°C) / 50 – 90°F (default maximum = 90°F)

21 Cooling range stops 10 – 32ºC (default minimum = 10ºC) / 50 – 90ºF (default minimum

= 50ºF)

22 Keypad lockout 0 = All keys available (default)
1 = All keys locked