Honeywell Thermostat CT2700 User Manual

CT2700  
An Electronic Round  
Programmable Thermostat  
USER’S GUIDE  
MERCURY  
SWITCH  
TYPICAL LOCATION OF A MERCURY  
SWITCH IN A THERMOSTAT  
M10614  
RECYCLING  
THERMOSTAT  
If this thermostat is replacing a control that  
contains mercury in a sealed tube, do not place  
your old control in the trash. Contact your local  
waste management authority for instructions  
regarding recycling and the proper disposal of this  
control, or of an old control containing mercury in a  
sealed tube.  
If you have questions, call Honeywell, Inc. at  
1-800-468-1502.  
Programmable Heat and/or Cool  
Low Voltage (20 to 30 Vac) Thermostat and Wallplate  
Model CT2700  
1
PREPARE FOR INSTALLATION  
Congratulations on the purchase of your new thermostat!  
Over 100 years of Honeywell engineering expertise went  
into the making of this thermostat in an effort to provide  
you with a more comfortable and convenient living  
environment.  
Check Table 1 to make sure this thermostat is  
compatible with your system. If not, return to the  
retailer. For more information, call Honeywell, Inc. at  
1-800-468-1502.  
Your new thermostat will automatically control the tem-  
perature in your home, keeping you comfortable while  
saving energy when programmed according to the  
instructions in this manual.  
Direct any questions concerning the application of this  
thermostat to Honeywell Customer Assistance at  
1-800-468-1502, Monday - Friday 7:00 a.m. - 5:30 p.m.,  
Central time.  
®U.S. Registered Trademark  
69-1085  
Copyright © 1997 Honeywell Inc. •  
All Rights Reserved  
 
CT2700 AN ELECTRONIC ROUNDPROGRAMMABLE THERMOSTAT  
Three Thermostat Wires  
4
WIRE WALLPLATE TERMINALS  
If you have three wires for heating only and can operate  
the fan using the FAN ON switch, this thermostat works  
with your system. However, some hot water (zoned)  
heating systems have three thermostat wires. The  
thermostat will work only if you install an isolating relay on  
these systems. For details, call Honeywell Customer  
Assistance Center at 1-800-468-1502.  
The CT2700 Thermostat is powered through the heating/  
cooling system and is adaptable to most 4-wire, 18 to 30  
Vac heating-cooling systems. Refer to Figs. 4 through 6 for  
some typical system wiring diagrams.  
T8700  
R
G
COOLING  
CONTACTOR  
Y
W
3
MOUNT WALLPLATE  
FAN  
RELAY  
HEATING  
PRIMARY  
IMPORTANT  
Level for appearance only. The thermostat  
1
CONTROL  
L1  
functions normally even when not mounted level.  
(HOT)  
24V  
L2  
Position the decorator cover plate and wallplate on  
the wall. Level the wallplate for appearance if  
desired. Use a pencil to mark the two mounting holes that  
best fit the application. See Fig. 3.  
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
1
OVERLOAD PROTECTION AS REQUIRED.  
M12525  
Fig. 4. CT2700 wiring diagram,  
4-wire heat/cool system.  
WALL  
T8700  
R
G
Y
DECORATOR  
PLASTIC SCREW  
COVER PLATE  
ANCHOR (2)  
W
HEATING  
RELAY AND  
FAN COIL  
1
WALLPLATE  
24V  
H
E
A
T
F
F
O
L
O
O
C
F
A
N
O
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M12543  
1
N
O
Fig. 5. CT2700 wiring diagram,  
2-wire, heat-only system.  
T8700  
R
M12532  
G
Y
Fig. 3. Mounting decorator cover plate and  
wallplate to wall.  
FAN  
COIL  
W
COOLING  
CONTACTOR  
COIL  
Remove the decorator cover plate and wallplate  
from the wall, and drill two 3/16-inch holes in the wall  
(if drywall). For firmer wall material such as plaster or  
wood, drill 7/32-inch holes. Gently tap provided anchors  
into the drilled holes until flush with the wall.  
1
L1  
(HOT)  
24V  
L2  
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M12544  
1
Reposition the decorator cover plate and wallplate,  
pulling wires through the wiring opening. Loosely  
insert the mounting screws into the holes.  
Fig. 6. CT2700 wiring diagram,  
3-wire, cool-only system.  
Level for appearance only; the thermostat functions  
properly even when not level. Tighten the mounting  
screws.  
IMPORTANT  
Use 18-gauge maximum wire to wire the  
thermostat.  
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3
CT2700 AN ELECTRONIC ROUNDPROGRAMMABLE THERMOSTAT  
All wiring must comply with local electrical codes and  
ordinances. If unsure about household wiring procedures,  
call your local heating and air conditioning contractor.  
5
ADJUST FAN OPERATION SWITCH  
The thermostat fan operation switch, labeled fuel switch in  
Fig. 9, is set at the factory in the F (gas/oil fuel) position.  
This is the correct setting for most systems. If this system  
is an electric heat system, set the switch to the E (electric)  
position. The E setting allows the fan to turn on immedi-  
ately with the heating or cooling equipment in a system  
where the G terminal is connected.  
Refer to the masking tape labels you placed on wires  
when you removed your old thermostat.  
Match the letter of your old thermostat wire with the  
terminal of the corresponding letter on your new  
thermostat. Refer to Fig. 7.  
FUEL SWITCH  
ROUTE WIRING AS  
SHOWN THROUGH  
ENTRANCE  
ALTERNATE MOUNTING  
SCREW HOLE  
HOLE  
MOUNTING  
SCREW  
HOLE  
E
F
R
G
Y
W
M12531  
ALTERNATE  
MOUNTING  
SCREW HOLE  
Fig. 9. Fuel switch, rear view of thermostat.  
MOUNTING  
SCREW HOLE  
M12529  
WIRING ENTRANCE HOLE  
Fig. 7. CT2700 wallplate wiring connections.  
6
MOUNT THERMOSTAT TO  
WALLPLATE  
NOTE: To ensure proper mounting of the thermostat,  
restrict all wiring to the left side of the terminals.  
Align the tab and connector pins at the top of the  
thermostat with the wallplate. See Fig. 10.  
Loosen the terminal screws and slip each wire  
beneath its matching terminal. The shape of the  
terminals permit insertion of straight or wraparound  
connections. See Fig. 8. Tighten the terminals.  
DASHED LINES  
INDICATE TABS  
ON BACK OF  
THERMOSTAT  
Set  
FOR WRAPAROUND, STRIP  
7/16 INCHES (11 mm)  
A ALIGN TABS/PINS AT TOP  
OF THERMOSTAT WITH  
WALLPLATE CONNECTOR.  
FOR STRAIGHT INSERTION,  
STRIP 5/16 INCHES (8 mm)  
M12537  
Fig. 8. CT2700 methods for wiring connection.  
PRESS THERMOSTAT CASE  
STRAIGHT ON TO LATCH.  
B
Plug the hole in the wall with insulation to help  
prevent drafts from adversely affecting thermostat  
operation.  
M12530  
Fig. 10. Mounting thermostat to wallplate.  
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4
CT2700 AN ELECTRONIC ROUNDPROGRAMMABLE THERMOSTAT  
Press the thermostat straight on to the wallplate to  
latch.  
3. Set WAKE  
Temperature  
SET  
AM  
a. Press  
b. Press  
.
NOTE: To remove the thermostat from the wallplate,  
grasp the thermostat on both sides and pull the  
thermostat straight out.  
or  
to set desired  
WAKE temperature.  
4. Set SLEEP Time  
Restore power to the heating/cooling system.  
a. Press  
.
PM  
b. Press  
or  
to set desired  
SLEEP time.  
7
PROGRAM YOUR THERMOSTAT  
The thermostat is preprogrammed for your convenience  
with the following time and temperature settings,  
see Table 2.  
5. Set SLEEP  
SET  
Temperature  
a. Press  
b. Press  
PM  
.
Table 2. Preprogrammed Time/Temperature Settings.  
or  
to set desired  
SLEEP temperature.  
Start  
Time  
Heating  
Setpoint  
Cooling  
Setpoint  
Period  
6. Run Program  
Press . End is  
WAKE  
6:00 AM  
70°F (21°C)  
78°F (25.5°C)  
82°F (28°C)  
SLEEP 10:00 PM 62°F (16.5°C)  
displayed for five  
seconds indicating the  
end of programming.  
The thermostat then  
displays the current  
time and room  
WAKE is the time period you want the house at a comfort-  
able temperature during the day.  
PM  
SLEEP is the time period you can set for an energy-  
savings temperature while you are sleeping.  
temperature.  
NOTE: The heating and cooling program times are the  
same. Changing your cooling WAKE time also  
changes your heating WAKE time.  
8
OPERATE YOUR THERMOSTAT  
The following sequence uses the heating program as an  
example; the System switch is in the HEAT position. To  
change to the cooling program, move the System switch to  
the COOL position and enter the cooling temperature  
settings.  
Display Temperature Setting  
a. Press  
or  
once  
SET  
to display present  
temperature setting.  
After approximately  
five seconds, the  
AM  
NOTE: To exit the sequence at any time, press  
until End is displayed.  
thermostat displays the current time and room  
temperature.  
1. Set Current Time  
a. Press  
.
Temporary Change  
PM  
b. Press  
or  
to set current  
time.  
a. Press  
the desired tempera-  
ture is displayed.  
or  
until  
SET  
AM  
If you wish to change the preprogrammed time/ tempera-  
ture settings, follow steps 2 through 6. If not, press the  
key until End is displayed or the thermostat will  
automatically return to normal operational mode within five  
minutes.  
b. TEMPORARY is  
displayed.  
The TEMPORARY  
change is in effect  
until the next program  
period.  
TEMPORARY  
AM  
2. Set WAKE Time  
a. Press  
b. Press  
.
AM  
or  
NOTE: To cancel your TEMPORARY change, press  
until End is displayed.  
to set desired  
WAKE time.  
69-1085  
 
5
CT2700 AN ELECTRONIC ROUNDPROGRAMMABLE THERMOSTAT  
Hold Function  
10  
CHECK OPERATION AFTER  
INSTALLATION/PROGRAMMING  
To hold the thermostat at one temperature indefinitely,  
program both WAKE and SLEEP to the same  
temperature.  
Heating System  
Slide the System switch to HEAT and the Fan switch  
to AUTO.  
9
SET FAN AND SYSTEM SWITCHES  
Press and hold the  
key to raise the temperature  
Manually control fan and system settings using the  
switches located at the top of the thermostat case. See  
Fig. 11 for switch locations.  
several degrees above the room temperature to  
start the heating equipment. When using the  
thermostat with the fuel switch set to the E position  
for electric heat, the fan starts immediately.  
SYSTEM SWITCH  
TEMPERATURE DISPLAY  
FAN SWITCH  
Press the  
below the room temperature. The heating equipment  
should stop.  
key to lower the temperature setting  
L
Cooling System  
CAUTION  
PM  
Operating at too low of an outdoor temperature  
may cause compressor damage  
Damage to compressor possible.  
Do not operate cooling system if outdoor tempera-  
ture is below 50°F (10°C). Refer to manufacturer  
recommendations.  
Set  
IMPORTANT  
Temporary protection delay protects compressor;  
the thermostat allows the compressor to remain  
off for five minutes before restarting.  
DECREASE  
SETTING  
INCREASE  
SETTING  
M12523  
Slide the System switch to COOL and the Fan  
switch to AUTO.  
Fig. 11. CT2700 time/temperature display and  
system/fan switches.  
Press the  
key to lower the temperature setting  
several degrees below the room temperature to start  
the cooling equipment.  
Fan Switch  
Press the  
above the room temperature. The cooling equipment  
should shut down.  
key to raise the temperature setting  
The FAN switch settings are:  
ON: The fan runs continuously. Use for improved air  
circulation.  
AUTO: Normal setting for most homes. In cooling,  
the fan starts and stops with the cooling equip-  
ment. In heating, the fan is controlled directly by  
the heating equipment and starts a few minutes  
after the heating equipment turns on (on most  
systems). When the thermostat fuel switch is set  
to the E position for electric heat, the fan starts  
and stops with the heating equipment.  
Fan  
Slide the System switch to OFF and the Fan switch  
to ON. The fan should run continuously.  
CUSTOMIZE YOUR THERMOSTAT  
The following instructions provide the information neces-  
sary to change the heating cycle rate to match your  
heating equipment; choose Fahrenheit (°F) or Celsius  
(°C); and 12- or 24-hour clock.  
Slide the switch on the thermostat to the desired fan  
setting.  
System Switch  
To exit at any time, press  
until End is displayed.  
The System switch settings control thermostat  
operation as follows:  
COOL: The thermostat controls the cooling system.  
OFF: Both heating and cooling are off.  
HEAT: The thermostat controls the heating system.  
1. Enter Installer Setup  
a. Slide System switch to OFF position.  
b. Use the or  
SET  
keys to set  
the temperature  
setpoint to 52°F  
(11°C).  
AM  
Slide the System switch on the thermostat to the  
desired system setting.  
69-1085  
 
6
CT2700 AN ELECTRONIC ROUNDPROGRAMMABLE THERMOSTAT  
c. After the  
thermostat  
b. Press  
to  
TEMPORARY  
AM  
display the  
current °F or  
°C setting.  
reverts back to  
displaying room  
temperature  
(approximately five seconds), simultaneously  
press and keys and hold for three  
seconds. Release the keys after the display  
changes.  
3. Fahrenheit - Celsius Temperature  
a. Use  
or  
to  
to choose between °C and °F.  
b. Press  
display the  
current 12- or  
24-hour clock  
setting.  
d. Press  
within  
five seconds.  
The display  
changes to  
show current  
cycle rate  
setting.  
4. Clock Format  
a. Use  
or  
to choose either a 12- or 24-  
hour clock format.  
Press  
once to exit the  
2. Cycles Per Hour  
Installer Setup. Upon exiting,  
the temperature setting will  
be at 52°F (11°C). Pressing  
six times returns the  
a. Use  
or  
to select 1, 3, 6, or 9 cycles per  
hour (cph). Refer to Table 3.  
Table 3. Heating Cycle Rates  
thermostat to the normal  
operational mode. End appears in the display.  
System  
Gas or oil forced air  
Electric furnace  
Program Setting (cph)  
6
9
3
5. Slide system switch to desired position.  
Hotwater baseboard, High  
efficiency (90+) gas furnace  
Steam, radiant floor heat,  
gravity  
1
TROUBLESHOOT YOUR THERMOSTAT  
Symptom  
Possible Cause  
Corrective Action  
Heating/cooling  
equipment will not  
operate  
No AC power to  
thermostat.  
Check power to heating/cooling equipment:  
On/Off switch  
Fuse or circuit breaker  
Loose 24V connection: At thermostat; at furnace/air  
conditioner  
Incorrect wiring: check appropriate wiring diagram.  
Thermostat inoperative.  
See checkout section.  
Reset System switch.  
System switch on  
thermostat in wrong  
position.  
Thermostat minimum-off Wait five minutes or follow steps in Checkout section.  
times operating for  
cooling.  
Incorrect wiring.  
Check wiring.  
Heating/cooling  
Consult equipment manufacturer instructions.  
equipment inoperative.  
Partial display  
No display  
Inoperative thermostat.  
Replace thermostat.  
Still in installer setup  
mode.  
See Installer Setup section for exit instructions.  
No power to thermostat.  
Check power to thermostat.  
Thermostat mounted  
See installation instructions for correct mounting.  
incorrectly on wallplate.  
Temperature display  
is incorrect  
Thermostat is configured Reconfigure the display. See Installer Setup section for  
for °F or °C.  
instructions to change the display.  
Cannot change  
temperature setting  
The upper or lower  
temperature limits were  
reached.  
Check the temperature setpoints; temperature setting  
range is 40°F (4°C) to 99°F (37°C).  
69-1085  
 
7
CT2700 AN ELECTRONIC ROUNDPROGRAMMABLE THERMOSTAT  
PERCENT OF HEATING  
COSTSYOU CAN SAVE  
SAVINGS FOR ONCE-A-DAY  
10°F (5°C) DECREASE*  
HEAT  
6
9
TO  
8%  
TO 11%  
12 TO 13%  
14 TO 15%  
16 TO 18%  
PERCENT OF COOLING  
COSTSYOU CAN SAVE  
SAVINGS FOR ONCE-A-DAY  
10°F (5°C) INCREASE*  
COOL  
7
TO  
9%  
10 TO 11%  
12 TO 14%  
14 TO 19%  
*
YOUR SAVINGS DEPENDS ON HOME SIZE AND  
ACTUAL HEAT LOSS OR GAIN, GEOGRAPHIC  
LOCATION, FREQUENCY OF TEMPERATURES  
CHANGE, AND RANGE IN DEGREES OF CHANGE.  
M12545  
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 the 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 Honeywell’s option) within a reasonable period of time.  
If the product is defective,  
(i) return it , with a bill of sale or other dated proof of purchase, to the retailer from which you purchased it, or  
(ii) package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction, and  
mail it, postage prepaid, to the following address:  
Honeywell, Inc.  
in Canada:  
Honeywell, Limited/Honeywell Limitée  
Product Services ON15-FFE  
155 Gordon Baker Road  
Return Goods Department  
1050 Berkshire Lane  
Plymouth, MN 55441-4437  
North York, Ontario M2H 3N7  
This warranty does not cover removal of reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or  
malfunction was caused by damage which occurred while the product was in the possession of a consumer.  
Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. Honeywell shall not be liable for  
any loss or damage of any kind, including any incidental or consequential damages resulting, directly or indirectly, from any breach of  
any warranty, expressed or implied, or any other failure of this product. Some states do not allow the exclusion or limitation or incidental  
or consequential damages, so this limitation may not apply to you.  
This warranty is the only expressed warranty Honeywell makes on this product. The duration of any implied warranties, including the  
warranties of merchantability and fitness for a particular purpose is hereby limited to the one year duration of this warranty. Some states  
do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.  
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.  
If you have any questions concerning this warranty, please write our Customer Assistance Center, Honeywell, Inc., P.O. Box 524,  
Minneapolis, MN 55440-0524, Monday - Friday, 7:00 a.m. to 5:30 p.m., Central time. In Canada, write Retail Products ON15-02H,  
Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 3N7.  
Home and Building Control  
Honeywell Inc.  
Honeywell Plaza  
Helping You Control Your World®  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
155 Gordon Baker Road  
North York, Ontario  
P.O. Box 524  
Minneapolis, MN 55408-0524  
M2H 3N7  
69-1085 R.T. 8-97 Printed in U.S.A.  
 

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