Honeywell Ct500 Owners Manual 69 1525, Electronic Thermostat

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CT500 Electronic Thermostat

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
Model CT500

CROSS-RECESSED
SCREWDRIVER

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.

HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL

WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES

LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE

M18920

Fig. 1. Required installation tools and supplies.

® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc. •

• All Rights Reserved

69-1525-2

CT500 ELECTRONIC THERMOSTAT

Table 1. System Compatibility
System Type

Compatible with CT500

Gas — Standing Pilot

Yes

Gas — Electronic Ignition

Yes

Gas-Fired Boilers

Yesa,b

Gas — Millivolt

No

Oil-Fired Boilers

Yesb

Oil-Fired Furnace

Yes

Electric Furnace

No

Electric Air Conditioning

Yes

Baseboard Electric (120/240 Line Volt)

No

Heat Pumps/Multistage Equipment

No

a

Not compatible with any 120/240 volt circuit.
Not compatible with 2-wire White-Rodgers no. 1361 zone valves.
aNot compatible with millivolt systems.
bCompatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermostat zone valves.

2 REMOVE OLD THERMOSTAT

WIRES THROUGH
WALL OPENING

❑ 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).

M5136

Fig. 2. Wrapping wires around pencil.

CAUTION

Replacing Clock With C or C1 Clock
Terminals

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.

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.

❑ 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.

69-1525—2

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.

2

CT500 ELECTRONIC THERMOSTAT

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.

CT500A
W
COOLING
CONTACTOR

Y
G
R

3 MOUNT WALLPLATE

HEATING
PRIMARY
CONTROL

1
L1
(HOT)

IMPORTANT
Level for appearance only. The thermostat functions normally, even when not mounted level.

FAN
RELAY

24V

L2
1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M14872

❑ 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

Fig. 4. CT500 wiring diagram, 4-wire heat/cool
system.

5-3/4 IN. x 5-3/4 IN.
DECORATOR
COVER PLATE

CT500A
WALL

W
Y

1

G
R

2

WALL
ANCHORS (2)

HEATING
PRIMARY
CONTROL

1
L1
(HOT)

24V

L2
1

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M14873

Fig. 5. CT500 wiring diagram, 2-wire, heat-only
system.
1

3-7/8 IN. x 3-7/8 IN. DECORATOR COVER PLATE (SELECT MODELS).

2

DRILL 3/16 INCH HOLES (IF DRYWALL) OR 7/32 (PLASTER OR WOOD)
WHEN USING WALL ANCHORS.
M14871

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.

Fig. 3. Mounting decorator cover plate and wallplate
to the wall.
❑ 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.

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.

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.
3

69-1525—2

CT500 ELECTRONIC THERMOSTAT

KEEP WIRING IN
SHADED AREA

DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT

ALTERNATE MOUNTING
SCREW HOLE

W
Set
Set

Y
G

Room

Room

MOUNTING
SCREW
HOLE

FAN
Auto
FAN
Auto On

SYSTEM
Cool Off Heat

SYSTEM
Cool Off Heat

R

A ENGAGE TABS AT TOP

ALTERNATE
MOUNTING
SCREW HOLE

OF THERMOSTAT WITH
SLOTS ON WALLPLATE.

B

M11025B

PRESS LOWER EDGE OF
CASE TO LATCH.

Fig. 8. Mounting thermostat to wallplate.

WIRING ENTRANCE HOLE
MOUNTING
SCREW HOLE

M14874

❑ Press the thermostat straight onto the wallplate to
latch.

Fig. 6. CT500 wallplate wiring connections.

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

FOR WRAPAROUND, STRIP
7/16 IN. (11 mm)

Display Temperature Setting

FOR STRAIGHT INSERTION,
STRIP 5/16 IN. (8 mm)

a. Press ▼ or ▲ once to display present temperature setting.
b. The temperature setpoint and the room temperature 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.

M12537

Fig. 7. CT500 methods for wiring connection.

5 MOUNT THERMOSTAT TO
WALLPLATE

INDICATOR
Set

Room

ROOM TEMPERATURE

SETPOINT TEMPERATURE

❑ Align the tab and connector pins at the top of the
thermostat with the wallplate. See Fig. 8.

M14679

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.

69-1525—2

4

CT500 ELECTRONIC THERMOSTAT

Cooling System

TEMPERATURE DISPLAY

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).

INCREASE
SETTING

Set

Room

FAN
Auto On

DECREASE
SETTING

IMPORTANT
Temporary protection delay protects compressor; the thermostat allows the compressor to
remain off for five minutes before restarting.

SYSTEM
Cool Off Heat

FAN SWITCH

❑ 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.

SYSTEM SWITCH
M11020A

Fig. 9. CT500 temperature display
and System/Fan switches.

Fan

Fan Switch

❑ Slide the System switch to Off and the Fan switch to
On. The fan should run continuously if the G terminal
is connected.

❑ 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.

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).

Slide the switch on the thermostat to the desired fan
setting.

To exit at any time, press ▼ key until End is displayed.

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.

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).

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.

❑ Slide the System switch on the thermostat to the
desired system setting.

M14683

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.

M14686

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.

M14687

5

69-1525—2

CT500 ELECTRONIC THERMOSTAT
4.

7.

Press the ▲ key again to display °C or °F.

Press the ▲ key to display heating/cooling temperature control default.

M14688
M18419A

5.

Press the ▼ key to change the °C or °F indication.
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).

M14689

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.

9.

Press the ▲ key again. Factory information (varies by model) is shown.

M18420

10.

M14690

Table 2. Heating Cycle Rates.
System

NOTE: After exiting installer setup mode, slide the System switch to the desired position and change
the setpoint to the desired room temperature.

Cycles per hour

Steam, gravity

1

Hot water heat, condensing gas
furnacea

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

a

High-efficiency furnace.

69-1525—2

Press the ▲ key to save all changes, exit installer
setup mode and return to normal operation.

6

CT500 ELECTRONIC THERMOSTAT

10 TROUBLESHOOTING
See Table 3 to troubleshoot your thermostat.
Table 3. Troubleshooting Your Thermostat.
Symptom
Heating/cooling
equipment does not
operate.

Possible Cause

Corrective Action

No power to the
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.

System switch on
thermostat not in
correct position.

Reset System switch.

Thermostat minimumoff times operating for
cooling.

Wait five minutes.

Incorrect wiring.

Check wiring.

Heating/cooling
equipment not
operating.

Consult equipment manfacturer instructions.

Thermostat not
operating.

Replace thermostat.

Remained in customize
mode.

See Customize Your Thermostat section to exit this mode.

No power to thermostat.

Check power to thermostat.

Thermostat mounted
incorrectly on wallplate.

See Mount Thermostat to Wallplate section.

Temperature display
is incorrect.

Thermostat is
configured for °F or °C.

Reconfigure the display. See Customize Your Thermostat
section for 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).

Snowflake is
flashing.

Cooling equipment
turns on after delay.

Wait approximately five minutes after the indicator starts flashing
and then check the registers.

System on indicator
(flame=heat) is
displayed, but no
warm air is coming
from the registers.

Heating equipment
turns on the fan when
the furnace has
warmed up to a
setpoint.

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.

Partial display.

No display.

7

69-1525—2

CT500 ELECTRONIC THERMOSTAT

PERCENT OF HEATING
COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) DECREASE*
HEAT

6 TO
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*
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, 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 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 Return Goods
Dock 4, MN10-3860
1885 Douglas Dr N
Golden Valley, MN 55422

Canada: Honeywell Limited/Honeywell Limitée
Product ServicesON15
35 Dynamic Dr
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 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, 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.
1985 Douglas Drive North
Golden Valley, MN 55422

69-1525—2 J.S. Rev. 5-03

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.com/yourhome



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Title                           : 69-1525, CT500 Electronic Thermostat
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