Your new Honeywell CT50A
Heating Thermostat will replace most 15 to 30 V, 2-wire heating system thermostats. The CT50A is suitable only for gas or oil heating systems (NOT for air conditioning, heating/air conditioning, heat pump or electric heating systems).
Your new CT5OC Cooling
Thermostat will replace most 15 to 30 V, 3-wire air conditioning system thermostats (NOT for heating, heating/air conditioning or heat pump systems).
Your new CT51
A Heating/Cooling Thermostat will replace most 15 to 30 V, 4-wire. heating/ cooling system thermostats. The CT51A is suitable for gas, oil or electric heating/electric air conditioning systems (NOT for heat pumps).
Your new CT53A Heating Thermostat is suitable for 250, 500 or 750 millivolts (mV) heating systems only.
CAUTION
If using CT51A for ELECTRIC furnace systems, you may need to install a jumper between thermostat terminals 1 and 2. If your old subbase is a Q539G, Q539J, Q634D or Q634G, you need the jumper. If in doubt about old sub base number, see section 3. If jumper is needed and is not installed, the furnace could overheat, causing a fire hazard. Use 18 gauge insulated wire strip ends before installing.
CAUTION To prevent possible compressor damage, do not operate air conditioning if the outdoor temperature is below 50° F [10° C]. Once the air conditioner is off, do not turn it on for 5 minutes: this action will prevent compressor damage.
Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to the following
NOTE: If your system is heating-only or air conditioning-only, disregard sections not applicable to your system.
SYMPTOM | PROBLEM | CORRECTIVE ACTION |
No heat The furnace turns on and off.Major swings in temperature (greater than 2° F (1° Cl when out side temperature is stable) | System switch at OFF or COOL Position. Blown fuse or tripped circuit breaker. The furnace power switch is on OFF. No pilot flame. Improper connections to the thermostat.Defective thermostat. (Here’s how you tell: Remove the thermostat from the wall. Discon next wire from W ter minal. Touch W wire to R terminal. The thermo stat is detective if the burner comes on.) Other. The burner ON period is too short.Burner ON period is too long. | Move the switch to the HEAT position. Replace the fuse or reset the circuit breaker. With power to the furnace OFF, tighten all mounting and terminal ·l screws. Re pair frayed or broken wires. WISE r-‘\ one scale mark. Replace the cover and wait several hours for the system to s tabilize. |
SYMPTOM | PROBLEM | CORRECTIVE ACTION |
The thermostat setting and thermometer reading disagree. | The thermostat is not level. | Recheck the thermostat position on the wall. Use a bubble level to make sure it’s level. See step 4. |
The thermostat is affected by drafts or radiant heat. | Contact a qualified service technician to change the location. The thermostat should be about 5 ft (1.5 m] above the floor and on an inside wall. | |
The thermostat is out of cali vibration. | Contact a qualified service technician to recalibrate the thermostat. | |
The thermometer is out of calibration. | Recalibrate. See step 8. | |
No air condition ing. | System switch in in OFF or HEAT position. | Move the switch to the COOL position. |
Blown fuse or tripped circuit breaker. | Replace the fuse or reset the circuit breaker. | |
The compressor switch (located outdoors) is turned OFF. | Move the switch to the ON position. | |
Improper connections to the thermostat. | With the power to the furnace OFF, tighten all mounting and terminal screws. Re pair broken wires. | |
Defective thermostat. (Here’s how you tell: Remove the thermostat from the wall. Disconnect wire from Y terminal. Touch the Y wire to terminal R. The thermostat is de fective if the compressor starts. Some systems | Exchange the thermostat. See Warranty. | |
have a time delay, so allow at least 5 minutes.) See caution in section 5. | ||
Other. Contact the service technician for assistance. |
If the thermostat set point and the thermometer reading do not agree, the thermometer may need recalibration. Follow the procedure below.
Honeywell warrants this product 1o be free from defects in workmanship. or materials, under normal use and service, tor at a period of one (1 year from the date of purchase by the consumer at any time during the warranty period the product is defective or malfunctions, Honeywell sal repair or replace it (at Honeywells options within a reasonable period of time # the product is detective a return it with a bit of sale. receipt or otter dated proof of purchase to the dealer or contractor from which you purchased or b package it carefully, along with a bit of site receipt or other dated proof ot purchase, and a short description of the main/on, and mail it, postage prepeid. to the fodlowing address Honeywell tec FReturmed Goods Department 1050 Berkshire Lane in Canad Honeywell Limited/Honeywell Limitee 740 Ellesmere Road Scarborough, Ontario M1P2V9 Plymouth. MN S5441-440 This warranty does not cover removal or reinstallation costs. This warranty shalt ot puppy is shown Honeywell that the defect or malfunction was caused by damage that occurred while the product was in its possession focus Honeywelis sole responsibility shall be to repair of replace the product within the terms listed above. HONEYWELL SHALL NOT BE LIABLE FOR ANY OSS OR DAMAGE OF ANY KIND, 1NCLUDING ANY INCIDENTAL OR CONSEQUENTIAL. DAMAGES RESULTING OIRECTLY 0R INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY EXPRESS oA IMPLIED. OR ANY OoTHER FAILURE OF THIS PRODUCT Some states do not allow the exclusion or limitation or consequential damages so this limitation may riot apply to you THIS WARRANTY 1S 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, S HEREBY LNATED 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 10 you. This warranty gives you specific legal rights. and you may travel for other rights which vary from state to state you have any questions concerning this warranty please write our Consumer Aslairs department, Honereoll ng. 188 Dougias Orive ort Golden Valey. MN 55422-4386. In Canada Honeywell Limiled/ Honeywe imitee 740 Elesmere Foad Scarborougn, Ontarid 1M1P2V3 or ca to-free at 1-800-468-1502 ate tos
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