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

  • All Rights Reserved 

OWNER'S GUIDE

69-1525-2

CT500 Electronic Thermostat

Non-programmable Heat and/or Cool 

Low Voltage (20 to 30 Vac) Thermostat and Wallplate  

Model CT500

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.

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.

Fig. 1. Required installation tools and supplies.

M18920

CROSS-RECESSED
SCREWDRIVER

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

Summary of Contents for CT500

Page 1: ...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 compa...

Page 2: ...ly 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 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 t...

Page 3: ...m 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 Fig 4 CT500 wiring diagram 4 wire heat cool system Fig 5 CT500 wiring diagram 2 wire heat only system IMPORTANT Use 18 gauge maximum wire to wire the ther mostat All wiring must comply with local electrical codes and ordinances If unsure about household wiring procedures c...

Page 4: ...wn 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 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 M14874 ALTERNATE MOUNTING SCREW HOLE MOUNTING SCREW HOLE MOUNTING SCREW HOL...

Page 5: ...rate cooling system when outdoor temperature is below 50 F 10 C IMPORTANT Temporary protection delay protects compres sor 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 ke...

Page 6: ...ol 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 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 d...

Page 7: ...ostat section to exit this mode No display 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...

Page 8: ...as 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 ...

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