Honeywell Ct8775c44471 Manual

OWNER’S GUIDE
® U.S. Registered Trademark • Patents Pending
Copyright © 2004 Honeywell International Inc.
All Rights Reserved 69-1676—1
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...

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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. 
This manual answers many of the questions that can arise as...

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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.
aCompatible with 2-wire Honeywell zone valves. Not compatible with Taco zone valves and 2- or 3-wire White- 
Rodgers zone valves (No. 1311 and 1361).
bNot compatible with any 120/240 volt system.
Package Contents
• Thermostat • Decorator...

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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...

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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 
decorator cover plate against the wall so that the UP 
indicator in the middle of the decorator cover plate is 
pointing up.
❑Position the wallplate:
❑If using the decorator cover plate, pull the wires 
through the wiring hole on the wallplate and place 
the wallplate over the decorator cover plate. Turn...

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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.
❑Pull the wires through the...

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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.
❑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.
IMPORTANT
Remove the factory-installed jumper connecting terminals R...

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Table 2. Terminal Designations on Old and New Thermostats.
NOTES:
1.If wires were connected to both Rh and R terminals on the old thermostat, remove jumper between R and Rc on 
the new thermostat and connect Rh to R and R to Rc.
2.If wires will be connected to both R and Rc on the new thermostat, remove jumper between R and Rc.
3.Do not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B with electri-
cal tape and do not use.
4.Tape off wire with...

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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. 
DIP Switch
❑To adjust the heat cycle rate or the...