Honeywell T16812A1000 Digital Thermostat Operating Instructions

Honeywell T16812A1000 Digital Thermostat

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

Terminal Designations

Terminal	Description
L	Live
Ch/Cc	Heating close / Cooling close
W/Y	Heating open / Cooling open
N	Neutral
Gl	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 (VC6valves)

Thermostat Installation

Installer Parameters Table

No	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

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Honeywell T16812A1000 Digital Thermostat Operating Instructions

Honeywell T16812A1000 Digital Thermostat Operating Instructions