Honeywell Digital Round T8775A Product Data
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Honeywell Digital Round T8775A Product Data

The digital non-programmable thermostats
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See also: Owner's Manual , Instruction and Installation Manual

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.
® U.S. Registered Trademark • Patents Pending
Copyright © 2004 Honeywell International Inc.
All Rights Reserved
T8775A,C The Digital Round
Non-Programmable Thermostats

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.
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
™
PRODUCT DATA
Contents
68-0279

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Summary of Contents for Honeywell Digital Round T8775A

  • Page 1: Table Of Contents

    Specifications ..............2 Ordering Information ............2 Installation .................3 Wiring ................4 Customize Thermostat ............5 Set System and Fan Switches ..........6 Checkout ................7 Troubleshooting Guide ............8 ® U.S. Registered Trademark • Patents Pending Copyright © 2004 Honeywell International Inc. All Rights Reserved 68-0279...

  • Page 2: Specifications

    If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care...

  • Page 3: Installation

    ™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS INSTALLATION ROOM 5 FEET [1.5 METERS] M19716A Fig. 2. Typical thermostat location. Separate Wallplate from Thermostat Mount wallplate to wall (See Fig. 4) as follows: 1. Place your thumbs on top of the thermostat and wall- plate.

  • Page 4: Wiring

    ™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS 4. Tap the provided wall anchors into the drilled holes until Refer to Fig. 7 through 11 for typical wiring diagrams. they are flush with the wall. 5. Pull the thermostat wires through the wiring hole on the wallplate and reposition the wallplate over the wall anchors.

  • Page 5: Customize Thermostat

    ™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS COMPRESSOR CONTACTOR HEATING RELAY OR RELAY VALVE COIL FUEL SWITCH M19497 Fig. 12. Fuel switch. 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS DIP Switch AND OVERLOAD PROTECTION AS REQUIRED. REMOVE FACTORY INSTALLED JUMPER BETWEEN R AND R C . To adjust the heat cycle rate or the Fahrenheit/Celsius M19517 temperature display, locate DIP switch 1, 2 and 3 on the back...

  • Page 6: Set System And Fan Switches

    ™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS Fahrenheit/Celsius Indication Use DIP switch 3 to set the desired temperature indication. See Table 2. (T8775C ONLY) SELECTS (T8775C ONLY) Table 2. Temperature Indication. ON/AUTO SELECTS COOL/OFF/HEAT Fahrenheit/Celsius Display DIP Switch 3 Fahrenheit (factory setting) ROOM SHOWS THAT THE CURRENT ROOM...

  • Page 7: Checkout

    ™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS Table 3. T8775 Power Stealing. Power Stealing Circuit ROOM System Switch T8775A T8775C Heat R and W R and W M19490 — R and W Cool — Rc and Y Fig. 18. Room temperature display. The T8775 Thermostat only operates when mounted on the Adjust Temperature Setpoint wallplate with 24 Vac applied.

  • Page 8: Troubleshooting Guide

    CHECK FUEL SWITCH POSITION. SEE CUSTOMIZE THERMOSTAT SECTION. HEATING OR COOLING EQUIPMENT CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS. INOPERATIVE. M19684 Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 Printed in U.S.A.

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