Honeywell Home CT50A Thermostat
INSTALLATION INSTRUCTIONS
PREPARATION FOR INSTALLATION
MERCURY NOTICE
If this product is replacing a control that contains mercury in a sealed tube, do not place the old control in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal.
For CT50A, CT51A Installation
! Before removing the old thermostat from the wall, look at it carefully to locate the heat anticipator adjustment mechanism. See illustration below to help you recognize the heat anticipator. Make a note here _____ of the anticipator setting.
REMOVING OLD THERMOSTAT
- Begin by turning off power to the heating system at the main fuse panel. Most residential systems have a separate switch box or circuit breaker for disconnecting power to the furnace.
- Remove cover of old thermostat. Cover normally snaps off when pulled firmly from the bottom. If it resists, check for a screw that locks the cover on.
IMPORTANT
Setting the heat anticipator allows the thermostat to maintain accurate temperature control.
Using a pencil point, move the heat anticipator pointer to the number it was set to on the old thermostat. If you could not find the anticipator setting on the old thermostat, use the setting for your type of system shown in the table below.
| Your heating system | Heat anticipator setting |
| Steam | 1.2 |
| Hot water heat | . |
| High-efficiency warm air | . |
| Standard warm air | .4 |
| Electric heat | .3 |
NOTES: If the furnace stays on beyond the thermostat set temperature, move the anticipator pointer down by 0.1 ampere.
If the furnace shuts off before the set temperature is reached, move the anticipator pointer up by 0.1 ampere.
Never adjust the anticipator below 0.3 ampere.
- Loosen screws holding thermostat to the wall and lift away.
- Disconnect wires from old thermostat or subbase. If your thermostat has more than 2 wires, as you disconnect each wire, tape the end and label it with the letter of the terminal designation to make reconnection to new thermostat easier. Take care that these wires do not fall back into the wall opening.
- Retain the old thermostat for reference purposes until your new thermostat is functioning smoothly.
WIRE AND MOUNT NEW THERMOSTAT
For CT50A
Connect one of the 2 wires from the wall to each of the two terminals on the back of the thermostat. Tighten the screws.
For CT51A
- Connect 4 wires from the wall to matching terminals on back of thermostat. Tighten the screws.
- If using CT51A for ELECTRIC heat systems, you must install a jumper between thermostat terminals 1 and 2.
CT53A
- Connect wires to R and W for 750 mV systems.
Connect to R and Y for 250 or 500 mV systems. Tighten the screws. - Grasp the thermostat cover at the top and bottom with one hand. Pull outward on the top edge of the thermostat cover until it snaps free of the thermostat base.
- Carefully remove and discard the red plastic pin located above the mercury switch. This pin protects this switch during shipment.
- Fasten the thermostat to the wall with one of the screws supplied, using the top mounting hole.
- Place your level across the top of the thermostat and level it. Start the second screw, supplied, in the center of the bottom mounting hole.
- Recheck for level positioning, then firmly tighten both mounting screws.
THERMOSTAT OPERATION
- On the CT51A, the system switch controls as follows:
- HEAT heating system only operates.
- OFF heating and cooling systems are disconnected.
- COOL cooling system only operates.
- The fan switch controls as follows:
- AUTO fan on when heating or cooling system operates.
- ON fan operates continuously.
NOTE: In the following instruction, disregard cooling directions if not applicable to your system.
- Turn on power to the heating/cooling system.
- Observe system operation for at least one cycle on both heating and cooling.
- To observe: Place the system switch at HEAT position and fan switch at AUTO.
- Move the temperature sensing lever to 10° F (6° C) above room temperature. The furnace should turn on.
A short warm-up period may be required before the system fan turns on. - Place system switch at COOL position and move temperature sensing lever 10° F (6°C) below room temperature. The cooling equipment should turn on and the system fan should turn on.
NOTE: Some systems have a time delay that can prevent operation up to 5 minutes. - Turn the fan switch to ON. The system fan should turn on, and operate continuously. The fan should continue to operate at any system switch or thermostat setting.
LIMITED 1-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 purchase by the consumer. If at any time during the warranty period the product is determined to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option).
If the product is defective,
- return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
- call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address:
- Honeywell Return Goods, Dock 4 MN10-3860, 1885 Douglas Dr.N., Golden Valley, MN 55422, or whether a replacement product can be sent to you.
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 that 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 warranty questions, please write Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502. In Canada, write Retail Products ON15-02H, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V4Z9.
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 customer.honeywell.com
® U.S. Registered Trademark
© 2005 Honeywell International Inc.
69-0265ES M.S. 12-05
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Honeywell Home CT50A Thermostat INSTALLATION INSTRUCTIONS
