CT500 Electronic Thermostat
THERMOSTAT FOR APPEARANCE
OWNER'S GUIDE
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of it properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of an old control. If you have
questions, call Honeywell at 1-800-458-1502.
1 PREPARE FOR INSTALLATION
❑ Check Table 1 to be sure this thermostat is compatible
with your system. If not, return it to the retailer. For
more information, call Honeywell at 1-800-468-1502.
❑ Acquire tool and items as needed. See Fig. 1.
Non-programmable Heat and/or Cool
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Congratulations on purchasing your new thermostat!
More than 100 years of engineering expertise enabled
this thermostat to provide you with a more comfortable
and convenient living environment.
Direct any questions about this thermostat to the
Honeywell Customer Relations Center at
www.honeywell.com/yourhome or 1-800-468-1502,
Monday - Friday, 7:00 am - 5:30 pm, Central time.
® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc. • • All Rights Reserved
Model CT500
Fig. 1. Required installation tools and supplies.
CROSS-RECESSED
SCREWDRIVER
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
LEVEL, IF NEEDED TO LEVEL
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
M18920
69-1525-2
CT500 ELECTRONIC THERMOSTAT
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Table 1. System Compatibility
System Type Compatible with CT500
Gas — Standing Pilot
Gas — Electronic Ignition Yes
Gas-Fired Boilers
Gas — Millivolt No
Oil-Fired Boilers
Oil-Fired Furnace Yes
Electric Furnace No
Electric Air Conditioning Yes
Baseboard Electric (120/240 Line Volt) No
Heat Pumps/Multistage Equipment No
Not compatible with any 120/240 volt circuit.
Not compatible with 2-wire White-Rodgers no. 1361 zone valves.
a
Not compatible with millivolt systems.
b
Compatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermostat zone valves.
Ye s
Ye s
Ye s
a
a,b
b
2 REMOVE OLD THERMOSTAT
❑ Test to be sure your heating and air conditioning
systems (where applicable) are working correctly. If
either does not work, contact you local heating/air
conditioning dealer. To avoid compressor damage, do
not operate the cooling system when outdoor
temperature is below 50°F (10°C).
CAUTION
Be careful when handling wires during
installation.
Damage to heating/cooling system possible.
Disconnect power at furnace or at main breaker/
fuse box before starting operation.
❑ Carefully unpack your new thermostat, wallplate, and
decorator cover plate; save package of screws,
instructions and receipt.
❑ Remove the cover from the old thermostat. If it does
not snap off when pulled firmly from the bottom, check
for a screw used to lock on the cover.
❑ Loosen screws holding the thermostat to the subbase,
wallplate and wall, and lift away.
❑ Disconnect wires from old thermostat or subbase. As
you disconnect each wire, use wire labels to identify
the old terminal designation. If there are only two
wires, they do not need labeling. Wrap wires around a
pencil to keep them from falling back into the wall as
shown in Fig. 2.
WIRES THROUG
WALL OPENING
M5136
Fig. 2. Wrapping wires around pencil.
Replacing Clock With C or C1 Clock Terminals
If you are replacing a Honeywell Chronotherm®
Thermostat, you may find one or two wires that go to the
C or C1 clock terminals on the Chronotherm®
Thermostat wiring wallplate. Do not allow them to touch,
or you can damage your transformer. Disconnect the
wires and wrap them separately using electrical tape; do
not wrap them together. Place the wires to avoid
interfering with the new thermostat operation. Record the
colors and terminal designation labels of the remaining
wires.
Six or More Wires
If there are six or more wires connected to the thermostat
(excluding clock wires attached to terminals), you
probably have a variation of a multistage heat pump or
other multistage system. The thermostat is not
compatible with such systems, so return the product to
your retailer. For information about which programmable
thermostats work with your system, call the Honeywell
Customer Relations Center at 1-800-468-1502.
69-1525—2 2
CT500 ELECTRONIC THERMOSTAT
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(
L
L
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3
Three Thermostat Wires
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 works only if you install an isolating relay on
these systems. For details, contact your local heating
and/or air conditioning contractor.
3 MOUNT WALLPLATE
IMPORTANT
Level for appearance only. The thermostat functions normally, even when not mounted level.
❑ 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
5-3/4 IN. x 5-3/4 IN.
DECORATOR
COVER PLATE
1
WALL
WALL
ANCHORS (2)
CT500A
W
Y
G
R
24V
HEATING
PRIMARY
CONTROL
system.
HEATING
PRIMARY
CONTROL
1
1
HOT)
2
24V
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
Fig. 4. CT500 wiring diagram, 4-wire heat/cool
CT500A
W
Y
G
2
R
1
1
HOT)
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
FAN
RELAY
COOLING
CONTACTOR
M14872
M1487
1
3-7/8 IN. x 3-7/8 IN. DECORATOR COVER PLATE (SELECT MODELS).
DRILL 3/16 INCH HOLES (IF DRYWALL) OR 7/32 (PLASTER OR WOOD)
2
WHEN USING WALL ANCHORS.
Fig. 3. Mounting decorator cover plate and wallplate
❑ Remove the decorator cover plate and wallplate from
the wall, and drill two 3/16-in. holes in the wall (if
drywall). For firmer wall material such as plaster or
wood, drill 7/32-in. holes. Gently tap provided anchors
into the drilled holes until flush with the wall.
❑ Reposition the decorator cover plate and wallplate,
pulling wires through the wiring opening. Loosely
insert the mounting screws into the holes.
❑ Level for appearance only; the thermostat functions
correctly, even when not level. Tighten the mounting
screws.
to the wall.
4 WIRE WALLPLATE TERMINALS
The CT500 Thermostat is powered through the heating/
cooling system and is adaptable to most 4-wire, 18 to 30
Vac heating-cooling systems. Refer to Fig. 4 and 5 for
typical system wiring diagrams.
M14871
Fig. 5. CT500 wiring diagram, 2-wire, heat-only
IMPORTANT
Use 18-gauge maximum wire to wire the 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.
Refer to the wiring labels you placed on the 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. See Fig. 6.
NOTE: To ensure correct mounting of the thermostat,
restrict all wiring to the left side of the terminals.
❑ 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. 7. Tighten the terminals.
❑ Plug the hole in the wall with insulation to help prevent
drafts from adversely affecting thermostat operation.
system.
3 69-1525—2
CT500 ELECTRONIC THERMOSTAT
E
7
,
S
9
KEEP WIRING IN
SHADED AREA
MOUNTING
SCREW HOLE
ALTERNATE MOUNTING
SCREW HOLE
W
Y
G
R
WIRING ENTRANCE HOLE
MOUNTING
SCREW
HOLE
ALTERNATE
MOUNTING
SCREW HOL
M14874
Fig. 6. CT500 wallplate wiring connections.
FOR WRAPAROUND, STRIP
7/16 IN. (11 mm)
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 mm)
Fig. 7. CT500 methods for wiring connection.
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
Set
Room
FAN SYSTEM
Cool Off Heat
Auto On
ENGAGE TABS AT TOP
A
OF THERMOSTAT WITH
SLOTS ON WALLPLATE.
M11025B
Fig. 8. Mounting thermostat to wallplate.
❑ Press the thermostat straight onto the wallplate to
latch.
NOTE: To remove the thermostat from the wallplate,
grasp the thermostat on both sides and pull it
straight out.
❑ Restore power to the heating/cooling system.
6 OPERATE YOUR THERMOSTAT
Display Temperature Setting
a. Press ▼ or ▲ once to display present temper-
ature setting.
b. The temperature setpoint and the room tem-
M1253
perature are shown separately on the digital
display. The ▼ indicator points to Set when the
temperature setpoint is displayed and to Room
when the room temperature is displayed.
Set
Room
FAN SYSTEM
Auto
PRESS LOWER EDGE OF
B
CASE TO LATCH.
Cool Off Heat
5 MOUNT THERMOSTAT TO WALLPLATE
❑ Align the tab and connector pins at the top of the
thermostat with the wallplate. See Fig. 8.
69-1525—2 4
INDICATOR
ROOM TEMPERATURE
Room
et
SETPOINT TEMPERATURE
M1467
7 SET FAN AND SYSTEM SWITCHES
Manually control fan and system settings using the
switches located at the bottom of the thermostat case.
See. Fig. 9 for switch locations.
CT500 ELECTRONIC THERMOSTAT
TEMPERATURE DISPLAY
A
3
6
7
Cooling System
INCREASE
SETTING
Set
Room
FAN SYSTEM
Auto On
FAN SWITCH
Fig. 9. CT500 temperature display
and System/Fan switches.
Cool Off Heat
SYSTEM SWITCH
DECREASE
SETTING
M11020
Fan Switch
❑ The Fan switch settings are:
On: The fan runs continuously. Use for improved air
circulation. (Recommended position with whole-house
air cleaners.)
Auto: Normal setting for most homes. In cooling, the
fan starts and stops with the cooling equipment. In
heating, the fan is controlled directly by the heating
equipment and starts a few minutes after the heating
equipment turns on.
Slide the switch on the thermostat to the desired fan
setting.
System Switch
❑ 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.
❑ Slide the System switch on the thermostat to the
desired system setting.
8 CHECK OPERATION AFTER INSTALLATION/PROGRAMMING
Heating System
❑ Slide the System switch to Heat and the Fan switch to
Auto.
❑ Press and hold the ▲ key to raise the temperature
several degrees above the room temperature to start
the heating equipment.
❑ Press the ▼ key to lower the temperature setting
below the room temperature. The heating equipment
should stop.
CAUTION
Compressor Damage Hazard.
Operating at too low of an outdoor
temperature can cause compressor damage.
Do not operate cooling system when outdoor
temperature is below 50°F (10°C).
IMPORTANT
Temporary protection delay protects compressor; the thermostat allows the compressor to
remain off for five minutes before restarting.
❑ Slide the System switch to Cool and the Fan switch to
Auto.
❑ Press the▼ key to lower the temperature setting
several degrees below the room temperature to start
the cooling equipment.
❑ Press the ▲ key to raise the temperature setting
above the room temperature. The cooling equipment
should shut down.
Fan
❑ Slide the System switch to Off and the Fan switch to
On. The fan should run continuously if the G terminal
is connected.
9 CUSTOMIZE YOUR THERMOSTAT
The following instructions provide the information
necessary to change the heating cycle rate to match your
heating equipment and choose Fahrenheit (F°) or
Celsius (°C).
To exit at any time, press ▼ key until End is displayed.
1. Enter Installer Setup
a. Slide System switch to Off position
b. Use the▼ or ▲ keys to set the temperature
setpoint to 52°F (11°C).
M1468
2. Press the ▲ and ▼ keys simultaneously for more
than one second to light all segments on the display and to enter installer setup mode. When the
keys are released, a two-digit software revision
code is displayed.
M1468
3. Press the ▲ key. Factory information is displayed.
A typical example is shown, but information displayed varies by model. This information is for factory use only.
M1468
5 69-1525—2
CT500 ELECTRONIC THERMOSTAT
8
9
0
A
0
4. Press the ▲ key again to display °C or °F.
M1468
5. Press the ▼ key to change the °C or °F indication.
M1468
6. Press the ▲ key to display the heat cycle rate of 1,
3, 4, 5, 6, 9, or 12. To change the heat cycle rate,
press the ▼ key to scroll between 1, 3, 4, 5, 6, 9, or
12. Stop scrolling when the desired rate is displayed. See Table 2 for the cycle rate options and
the corresponding system equipment.
M1469
Table 2. Heating Cycle Rates.
System Cycles per hour
Steam, gravity 1
Hot water heat, condensing gas
a
furnace
3
Special applications - do not use 4
Special applications - do not use 5
Gas or oil forced air 6 (factory preset)
Electric heat 9
Factory function — do not use. 12
7. Press the ▲ key to display heating/cooling temper-
ature control default.
M18419
8. Press the▼ key again to change heating/cooling
temperature control to C1 or C3.
C1 = Standard heating/cooling temperature control.
C3 = Agressive heating/cooling temperature control
(can cause room temperature to overshoot the
setpoint).
9. Press the ▲ key again. Factory information (var-
ies by model) is shown.
M1842
10. Press the ▲ key to save all changes, exit installer
setup mode and return to normal operation.
NOTE: After exiting installer setup mode, slide the Sys-
tem switch to the desired position and change
the setpoint to the desired room temperature.
a
High-efficiency furnace.
69-1525—2 6
10 TROUBLESHOOTING
See Table 3 to troubleshoot your thermostat.
Table 3. Troubleshooting Your Thermostat.
Symptom Possible Cause Corrective Action
Heating/cooling
equipment does not
operate.
Partial display. Thermostat not
No display. No power to thermostat. Check power to thermostat.
Temperature display
is incorrect.
Cannot change
temperature setting.
Snowflake is
flashing.
System on indicator
(flame=heat) is
displayed, but no
warm air is coming
from the registers.
No power to the
thermostat.
System switch on
thermostat not in
correct position.
Thermostat minimumoff times operating for
cooling.
Incorrect wiring. Check wiring.
Heating/cooling
equipment not
operating.
operating.
Remained in customize
mode.
Thermostat mounted
incorrectly on wallplate.
Thermostat is
configured for °F or °C.
The upper or lower
temperature limits were
reached.
Cooling equipment
turns on after delay.
Heating equipment
turns on the fan when
the furnace has
warmed up to a
setpoint.
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.
Reset System switch.
Wait five minutes.
Consult equipment manfacturer instructions.
Replace thermostat.
See Customize Your Thermostat section to exit this mode.
See Mount Thermostat to Wallplate section.
Reconfigure the display. See Customize Your Thermostat
section for instructions to change the display.
Check the temperature setpoints; temperature setting range is
40°F (4°C) to 99°F (37°C).
Wait approximately five minutes after the indicator starts flashing
and then check the registers.
Wait a minute after seeing the on indicator and then check the
registers. If still no heat is coming from the registers, call your
local heating and/or cooling contractor.
CT500 ELECTRONIC THERMOSTAT
7 69-1525—2
CT500 ELECTRONIC THERMOSTAT
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M12545
PERCENT OF HEATING
COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) DECREASE*
6TO 8%
9 TO 11%
12 TO 13%
14 TO 15%
16 TO 18%
PERCENT OF COOLING
COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) INCREASE*
7TO 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
HEAT
COO
Limited One-Year Warranty
Honeywell warrants this product, excluding battery, 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 Honeywel l’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 Return Goods Canada: Honeywell Limited/Honeywell Limitée
Dock 4, MN10-3860 Product ServicesON15
1885 Douglas Dr N 35 Dynamic Dr
Golden Valley, MN 55422 Scarborough, Ontario M1V4Z9
This warranty does not cover removal or 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 sh all be to repair or replace the produ ct within the terms stated above. H ONEYWELL 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, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS 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 Relations Center, or call 1-800-468-1502, Monday-Friday, 7:00 a.m to 5:30
p.m, Central time. In Canada, write Retail Products ON15-02H, Honeywell Limited/Honeywell Limitée, 35 Dynamic Dr, Scarborough, Ontario M1V4Z9.
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeyw ell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
69-1525—2 J.S. Rev. 5-03 www.honeywell.com/yourhome
M1V 4Z9
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