Operation Manual

ManualsBrandsHoneywell ManualsThermostatsHoneywell CT8775C

69-1676

OWNER’S GUIDE

® U.S. Registered Trademark

CT8775A,C

THE DIGITAL ROUND

™

NON-PROGRAMMABLE THERMOSTATS

CT8775A Heat Only Thermostat (20 to 30 Vac) and

CT8775C Heating-Cooling Thermostat (20 to 30 Vac)

Para obtener un documento con las instrucciones en español, por favor visite

nuestro sitio de web a: www.honeywell.com/yourhome.

Pour obtenir des notices techniques en français, veuillez consulter notre site web

www.honeywell.com/yourhome.

Contents

Step 1. Prepare for Installation ................................................................................................................................... 3

Step 2. Remove Old Thermostat ................................................................................................................................ 4

Step 3. Special Installations......................................................................................................................................... 4

Step 4. Label Thermostat Wires .................................................................................................................................. 5

Step 5. Separate Wallplate from Thermostat............................................................................................................... 5

Step 6. Mount Decorator Cover Plate and Thermostat Wallplate................................................................................ 5

Step 7. Wire Wallplate Terminals................................................................................................................................. 8

Step 8. Customize the Thermostat .............................................................................................................................. 10

Step 9. Mount the Thermostat ..................................................................................................................................... 11

Step 10. Set the System and Fan Switches ................................................................................................................ 12

Step 11. Operating the Thermostat.............................................................................................................................. 13

Step 12. Check Operation of Heating and/or Cooling System .................................................................................... 13

If You Have A Problem ................................................................................................................................................ 15

Wiring Diagrams.......................................................................................................................................................... 16

Summary of content (20 pages)

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THE DIGITAL ROUND™ CT8775A,C NON-PROGRAMMABLE THERMOSTATS OWNER’S GUIDE CT8775A Heat Only Thermostat (20 to 30 Vac) and CT8775C Heating-Cooling Thermostat (20 to 30 Vac) Para obtener un documento con las instrucciones en español, por favor visite nuestro sitio de web a: www.honeywell.com/yourhome. Pour obtenir des notices techniques en français, veuillez consulter notre site web www.honeywell.com/yourhome. Contents Step 1. Prepare for Installation .......................................................
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Enjoy the benefits of The Digital RoundTM Thermostat by Honeywell. • • • • Simple to use. Turn the dial to adjust the temperature setting. 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 temperature setting is held permanently in memory in the event of a power failure.
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STEP 1. PREPARE FOR INSTALLATION ❑ Check Table 1, the compatibility chart, to make sure the thermostat is compatible with your system. If your system is not compatible, call Honeywell Customer Care, toll-free, 1-800-468-1502. Table 1. Compatibility Chart.
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STEP 2. REMOVE OLD THERMOSTAT ❑ Test your heating and cooling systems to make sure they work properly. If either system does not work, contact your local heating/air-conditioning dealer. To avoid compressor damage, do not operate the cooling system when outdoor temperature is below 50°F (10°C). ❑ Turn off power to the system at the furnace or the fuse/circuit breaker panel. ❑ Carefully unpack your new thermostat and decorator cover plate. Save package of screws, instructions, and receipt.
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Replacing a thermostat that is connected to three wires on a warm air heating only system If you are replacing a thermostat that is connected to three wires on a warm air heating only system and could turn the fan on by setting the thermostat fan switch to ON, the CT8775C Thermostat will work with your system. Continue with the installation at Step 4. If you purchased a CT8775A thermostat, return the product to the place of purchase. The CT8775A thermostat is not compatible with this application.
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Mount Decorator Cover Plate (Optional) and Wallplate Directly to Wall ❑ If using the decorator cover plate, pull the wires through the wiring hole on the decorator cover plate. Position the WALL ANCHORS (2) decorator cover plate against the wall so that the UP DECORATOR COVER PLATE indicator in the middle of the decorator cover plate is pointing up.
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Mount Decorator Cover Plate (Required) and Wallplate onto Electrical Box ❑ Pull the wires through the wiring hole on the decorator cover plate. ❑ Place the decorator cover plate against the electrical box so that the UP indicator in the middle of the decorator cover plate is pointing up. ❑ Line up the screw slots on the decorator cover plate with the electrical box screw holes, and attach the decorator cover plate to the electrical box with two 1/2 in. screws.
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STEP 7. WIRE WALLPLATE TERMINALS IMPORTANT All wiring must comply with local codes and ordinances. If unsure about household wiring procedures, call your local heating/air conditioning contractor. R G ❑ Refer to the labels you placed on the wires when you removed the old thermostat (see illustration). ❑ Match the letter of your old thermostat wire with the corresponding terminal letter on your new thermostat. Refer to Table 2.
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Table 2. Terminal Designations on Old and New Thermostats. Terminal on Old Thermostat Connect to Terminals on CT8775A Connect To Terminals on CT8775C Description R Rh (see Note 1) 4 V R R (see Note 2) Power Rc R (see Note 1) — Rc (see Note 2) Power for cooling W, W1, H W W Heat Y, Y1, M — Y Cooling G, F — G Fan O — O Changeover in cool. (Single stage heat pump only). B (see Note 3) — B (see Note 3) Changeover in heat. (Single stage heat pump only).
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STEP 8. CUSTOMIZE THE THERMOSTAT Set Fuel Switch (CT8775C Only) ❑ To adjust the fuel switch, locate the switch labeled E/F on the wallplate (see Fig. 3). The fuel switch is factory set in the F position. This is the correct setting for gas or oil systems. If you have an electric heat system, or a heat pump, set the switch to E. The E setting allows the fan to turn on immediately with the heating system where the G terminal is connected.
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Table 3. Heat Cycle Rate. Heating System Cycles Per Hour DIP Switch 1 DIP Switch 2 Steam, Gravity 1 On On High Efficiency Warm Air (90%+ efficiency), Hot Water, Heat Pump 3 Off On Gas or Oil Warm Air (factory setting) 6 Off Off Electric Warm Air 9 On Off In Floor Radiant Heat Check with manufacturer for recommended cycle rate. NOTE: The cooling cycle rate does not require adjustment and therefore cannot be changed.
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STEP 10. SET THE SYSTEM AND FAN SWITCHES (CT8775C ONLY) System Switch (see Fig. 5) ❑ Heat: The thermostat controls your heating system. ❑ Off: Both the heating and cooling systems are off. ❑ Cool: The thermostat controls your cooling system. Fan Switch (see Fig. 5) ❑ Fan Auto: Normal setting for most homes. The fan only runs with the heating and cooling system. ❑ Fan On: The fan runs continuously. Use for improved air circulation.
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STEP 11. OPERATING THE THERMOSTAT NOTE: Batteries are not required because the temperature setting is held permanently in memory. Backlit Display ❑ The backlight can be turned on by turning the dial, or pushing the backlight button (see Fig. 5). Display Temperature Setting ❑ Turn the dial one click to display the temperature setting (see Fig. 6). A indicator points to Set when the temperature setting is displayed. ROOM SET M19489 Fig. 6. Temperature Setting Display.
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Cooling System (CT8775C Only) CAUTION Equipment Damage Hazard. Can cause permanent damage to compressor or other equipment. Do not operate cooling when outside temperature is below 50°F (10°C). Allow compressor to remain off for five minutes before restarting. See equipment manufacturer instructions. ❑ Slide the system switch to Cool and the Fan switch to Auto. ❑ Turn the dial counterclockwise to lower the temperature setting several degrees below the room temperature.
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IF YOU HAVE A PROBLEM Table 5. Solution Guide. If... Display does not appear. Then… Make sure the thermostat is wired correctly. Refer to Table 2 or the wiring diagrams. • Make sure the thermostat is mounted and latched on the wallplate. • Make sure the circuit breaker is not tripped, and reset it if necessary. • Make sure the power switch at the equipment is in the On position and set it to On if it is in the Off position.
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Wiring Diagrams O 2 R Rc R W 1 HEATING RELAY OR VALVE COIL 2 FACTORY INSTALLED JUMPER. O 2 Rc R B G Y W HEATING RELAY OR VALVE COIL COMPRESSOR CONTACTOR FAN RELAY 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 FACTORY INSTALLED JUMPER. M19452 69-1676 FAN RELAY 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M19450 1 G Y W HEATING RELAY OR VALVE COIL 1 1 POWER SUPPLY.
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4 O Rc 2 R O B B G Y 3 W COMPRESSOR CONTACTOR 1 2 Rc R G Y W HEAT CHANGEOVER VALVE FAN RELAY COMPRESSOR CONTACTOR COOL CHANGEOVER VALVE 1 HEATING RELAY OR VALVE COIL FAN RELAY 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 FACTORY INSTALLED JUMPER. M19453 3 USE A JUMPER WIRE (NOT SUPPLIED) TO CONNECT W TO Y. 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 4 USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
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Limited One-Year Warranty Honeywell warrants this product to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywells option) within a reasonable period of time.
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69-1676
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Automation and Control Solutions Honeywell Internation Inc. 1985 Douglas Drive North Golden Valley, MN 55422 69-1676 J.S. 7-03 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. www.honeywell.