Honeywell Digital Round T8775A

PRODUCT DATA
68-0279
® U.S. Registered Trademark • Patents Pending
Copyright © 2004 Honeywell International Inc.
All Rights Reserved
T8775A,C The Digital Round
™
Non-Programmable Thermostats
APPLICATION
The T8775A and T8775C Thermostats provide single-stage,
non-programmable temperature control for 24 Vac systems
with manual changeover from heat to cool.
The T8775A controls 2-wire heating-only systems.
The T8775C controls gas, oil or electric heating and cooling
systems.
FEATURES
• Attractive styling complements any decor.
• Simple to use. Turn the dial to adjust the setpoint
temperature.
• Large easy-to-read display. The temperature reading is
easily seen from a distance.
• Backlit display. On-demand backlighting makes it easy
to read the display in a dark room or hallway.
• No batteries required. The setpoint temperature is held
permanently in memory in the event of a power failure.
• Powered through heating-cooling system controls.
• System and Fan switches on the T8775C model.
• Manual changeover from heat to cool on T8775C
model.
• Easy installation and set up saves time and increases
installer productivity.
• Easily configurable by the use of DIP switches.
• Fahrenheit or Celsius temperature display for added
flexibility.
• Selectable heating cycle rates (1, 3, 6, 9 CPH) for a
variety of applications.
• Cooling cycle rate is fixed at 3 CPH. This is the
standard compressor setting.
• Minimum off-time for the compressor in the cooling
mode. Protects and extends the life of the equipment.
• Decorative cover plate is available to cover marks on
the wall or to mount the T8775 Thermostat to an
electrical box.
Contents
Application.........................................................................1
Features ............................................................................1
Specifications ....................................................................2
Ordering Information .........................................................2
Installation .........................................................................3
Wiring ................................................................................4
Customize Thermostat ......................................................5
Set System and Fan Switches ..........................................6
Checkout ...........................................................................7
Troubleshooting Guide ......................................................8

Honeywell Digital Round T8775A Specifications

General

Type	Digital Thermostat
Model Number	T8775A
Shape	Round
Display	Digital
Programmability	Non-programmable
Stages	1 Heat / 1 Cool
Battery Type	AA
Accuracy	±1°F
Temperature Range	40°F to 90°F
Voltage	24VAC
Power Source	Hardwired

Summary

Application

Features

Specifications

Ordering Information

Installation

Separate Wallplate from Thermostat

Procedure to detach the thermostat from its wallplate.

Mount Wallplate to Wall

Instructions for securely attaching the wallplate to the wall.

Mount Thermostat to Wallplate

Steps to attach the thermostat unit onto the installed wallplate.

Wiring

Customize Thermostat

Setting Fuel Switch (T8775 C only)

How to set the fuel switch for different system types (gas, oil, electric).

Set Heat Cycle Rate

Using DIP switches to adjust heating cycle rates for various heating systems.

FahrenheitCelsius Indication

Configuring the thermostat display to show temperature in Fahrenheit or Celsius.

Set System and Fan Switches (T8775 C only)

SYSTEM Switch

Setting the system switch for Heat, Off, or Cool modes.

FAN Switch

Setting the fan switch for Auto or continuous On operation.

Features and Operation

Checkout

Troubleshooting Guide