Honeywell CPFILA User's Manual
Contents
1. 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 CONTENTS N m U PREPARATION 1 THERMOSTAT FEATURES 2 REMOVING OLD THERMOSTAT 3 WIRE AND MOUNT NEW THERMOSTAT 4 CHECK OUT THE THERMOSTAT 5 THERMOSTAT SETTING 6 TROUBLESHOOTING 7 RECALIBRATE THERMOMETER 8 Top Mounting Hole thermostat to wail or outlet box Adjustable Heat ipator Lever Mounting Clips for cover THERMOSTAT FEATURES Bottom Mounting Hole Temperature Setting Lever omal Ww i g For CT53A so o Connect wires to R and W for not match 750 mV systems Connect to R and Y EEEa for 250 or 500 mV systems Tighten the MOSTAT screws MARKED thermostat operation Push excess wire back into wall and plug hole with nonflammable insulation to prevent drafts from affecting LIMITED ONE YEAR WARRANTY Honeywell warrants thes product to be free from defects in workmanship of matanals under normal use and service for a period of one 1 year trom the date of purchase by the consumer H at any time during the warranty period the product is defective or mattunctions Honeywell shall fepair or repace it at Honeywell s option within a reasonable period of time the product is detective2. a return it wth a bw of sate receipt of other dated proof of purchase to the dealer or Contractor from which you purchased tt or b peckage it carefully along with a bilt of saie receipt or other dated proof of purchase and a short descripson of the malfunction and Maa it postage prepaid t the following address in Canada Honeywell Uimited Honeywell Limitee 740 Ellesmere Road Scarborough Ontario MIP2va Honeywell me Returned Goods Department 1050 Berkshire Lane Prymouth MN 55441 440t This warranty does not cover removal or reinstallation costs This warranty shail pot apply if it is shown by Honeywell that the detect or mailuricion was caused by damage which occurrad white the product was in the possession of a consumer Honeywell s sole responsibility sail De to repair or replace the product within the terns limed 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 OF IMPLIED OR ANY OTHER FAILURE OF THIS PRODUCT Some states do fot aow the exclusion oF limitation o consequential damages so thes limitation may cot apply 10 you THIS WARRANTY 5 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
3. installation before removing the old thermostat from the wall look at it carefully to locate the heat Place a bubble level or plumb line against the ther mostat to find the level position Start a screw in the center of the bottom mounting hole Move the temper ature setting lever if necessary to uncover the mounting hole Bubbie Level e 5 wire Grasp the thermostat cover at i cannot the top and bottom with one Plumb rmostat hand Pull outward on the bottom edge Ese enda of the thermostat cover until it snaps aad b ou may ninals 1 634D or Id sub J and is ig a fire before Terminal Screws CT51A shown free of the thermostat base i Fasten thermostat to wall or vertical outlet box with a screw through the top mounting hole See step 2 for hole location Step 4 continued 4 WIRE AND MOUNT THERMOSTAT continued C Recheck for level positioning and firmly tighten both mounting screws C if installing CT50A or CT51A make sure you have the current anticipator setting for your system This is the number you wrote in the box in step 3 If you were unable to find the current draw for step 3 this information can be found printed on the primary control at the furnace The primary control is usually a gas valve zone valve or a relay or burner control box with the thermostat wires connected to it For electric heat you need to add the fen relay current usually 0 2
4. to 0 4 A SHOWS LOW VOLTAGE SHOWS CURRENT DRAW ZONE VALVE er OIL BURNER CONTROL HO SHOWS LOW CURRENT DRAW VOLTAGE SHOWS LOW VOLTAGE To BURNER 24 Vac 50 60 Hz 0 4 AMP FROM MAIN FUEL SUPPLY SHOWS CURRENT DRAW TYPICAL GAS VALVE 11 181 C On the CT50A or CT51A set heat anticipator indicator at rating printed on primary control C Press the thermostat cover firmly onto the mounting clips CAUTION 1 If your anticipator is set too low it may burn out 2 Shorting out your valve or control could cause your anticipator to burn out CHECK OUT THE THERMOSTAT CAUTION To prevent possible com pressor damage do not operate air conditioning if 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 On the CT51A the system switch controls as follows HEAT heating system only operates OFF heating and air condi tioning systems are dis connected COOL air conditioning sys tem only operates The fan switch controls as follows AUTO fan operates when heating or air conditioning system operates ON fan operates continu ously NOTE In the following instruc tion disregard heating or air conditioning directions if not applicable to your system C Turn on power to the heating air conditioning system Observe system o
5. Honeywell Heating Air Conditioning or Heating Air Conditioning Thermostats INSTALLATION INSTRUCTIONS The CT50A is for most gas and oil heating only systems The CT50C is for most electric air conditioning only systems The CT51A is for most gas oil or electric See heating electric air conditioning systems The CT53A is for millivoltage heating systems Do it yourself models clita CT50A C CT51A CT53A CT51A shown if you are unsure about wiring procedures please call a qualified service technician for assistance J FLAT BLADE SCREWDRIVER PREPARATION new thermostat will occur if you follow instructions STEP BY STEP It is recommended C Proper installation of your WIRE CUTTER STRIPPER OR SHARP KNIFE YOUR NEW THERMOSTAT 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 CT50C Cooling Thermostat will replace most 15 Check thermostat suitability for your home s system by reviewing YOUR NEW THERMOSTAT section above to 30 V 3 wire air conditioning system thermostats NOT for heating heating air conditioning or heat pump systems CON PREPAI Your new CT51A Heating Cooling Thermostat will THERM replace most 15 to 30 V 4 wire heating cooling system REM
6. OV thermostats The CT51A is suitable for gas oil or electric WIRE A heating electric air conditioning systems NOT for heat pumps CHECK Your new CT53A Heating THERM Thermostat is suitable for 250 500 or 750 millivolt mV heating TROUB syst nly TRR RN RECALI Assemble tools required as shown left Make certain that your burner air conditioner where applicable are working HAND OR POWER DRILL WITH 3 16 INCH DRILL BIT especially if they have been inoperative for any length of time If either does not work contact your local heating air conditioning dealer Do NOT operate the air conditioning system if outdoor temperature is below 50 F 10 C Carefully unpack your new thermostat Remove and discard the packing insert under the cover that as you read understand and bie CEE complete each step you check it off with pencil or pen SPIRIT LEVEL OR PLUMB BOB AND LINE 11 9530 Save package of screws and instruction pages THER 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 anticipator adjustment mechanism See last illustration under step 4 to help you recognize the heat anticipator Make a not
7. Some states dao not allow imitations on how long an implied warranty lasts 30 the above Limitation may 91 apply to you This warranty gives you specific legal rights and you may tne other rights which wary trom state t0 state E you have any questions concerrang this warranty please write our Consumar Afairs department Honeywall ino 1885 Douglas Drive North Golden Valley MN 55422 4386 In Canadsa Honeywell Limited Horeywesi Limisee 740 Elesmere Road Scarborough Ontarid 1A1P2V9 call tofl free at 1 900 468 1602 R T Form Number 69 0514 2 Rev 9 97 Printed in U S A Honeywell Inc 1997 when the fan comes on If the fan comes on immediately you need to add the jumper noted in section 4 between terminals 1 amp 2 If there is a noticeable delay before the fan comes on there is no need to add the jumper because your furnace controls the fan Begin by turning off power to the heating air conditioning system at the main fuse panel Most residential systems have a separate switch box or circuit breaker for disconnecting power to the furnace REMOVING OLD THERMOSTAT C If you have an electric furnace you need to determine how your fan is controlled Turn it on and adjust your present thermostat so the heat comes on while observing 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 y For CT50A or CT51A
8. ate thermometer After allowing 5 or 10 minutes for stabilization compare the read E ings C lf the readings are the same replace cover and put the system into operation C if the readings are different insert a hex head wrench in the ther mometer shaft and turn it until the thermometers have the same reading Replace cover and put the system into operation nan
9. e here ___J of that anticipator setting for future reference The heat anticipator pointer if adjustable will be set at one of a series of numbers representing the electrical current rating of the primary control of your system in amps The number will range from 0 18 to 1 0 If no heat anticipator indication is showing do not be THERMOSTAT OLD THERMOSTAT TERMINAL MARKED from the wall to matching terminals on back of thermostat Tighten the screws NOTE If terminal designations on old thermostat do not match those on new thermostat refer to chart below FUNCTION NEW THERMOSTAT TERMINAL MARKED WIRE AND MOUNT RH M VR 4 AorR G or F Yorc Cooling W orH Heating _ oa RC V VC or B Power You have a 5 wire CAUTION system and cannot use this thermostat we recommend a CT87B instead concerned move on to the next step Loosen screws holding thermostat base to subbase or wall and lift away For CT50A Connect each wire from the wall to either terminal on the back of the thermostat Tighten the screws For CT50C or CTS51A Connect wires C Keep the old thermostat for reference purposes until your new thermostat is functioning smoothly 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
10. e power switch is on OFF No pilot flame Improper connections to thermostat Defective thermostat Here s how you tell Remove the thermostat from the wall Discon nect wire from W ter minal Touch W wire to R terminal The thermo Stat is detective if the burner comes on Other Furnace turns on and off Burner ON period is too short Replace fuse or reset circuit breaker Switch to ON Relight pilot flame per furnace manufacturer s instructions With power to furnace OFF tighten all mounting and terminal screws Re pair frayed or broken wires Exchange the thermostat see Warranty Contact a qualified service technician for assistance Remove the thermostat cover and move the heat anticipator lever COUNTER CLOCKWISE sN one scale mark Replace the cover and wait several hours for the system to stabilize Major swings in temperature greater than 2 F 1 C when out side temperature is stable Burner ON period is too long ____ Remove the thermostat cover and move the heat anticipator lever CLOCK WISE one scale mark Replace the cover and wait several hours for the system to stabilize RECALIBRATE THERMOMETER SYMPTOM F PROBLEM CORRECTIVE ACTION and thermometer Thermostat J Thermostat is not level reading disagree Thermostat affected by drafts or radiant heat T
11. hermostat is out of cali bration Thermometer is out of calibration Recheck the thermostat position on wall Use a bubble level to make sure it s level See step 4 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 Contact a qualified service technician to recalibrate the thermostat Recalibrate See step 8 No air condition A ing System switch in in OFF or HEAT position Blown fuse or tripped circuit breaker Compressor switch lo cated outdoors is turned OFF Improper connections to thermostat Defective thermostat Here s how you tell Remove the thermostat from wall Disconnect wire from Y terminal Touch Y wire to terminal R The thermostat is de fective if the compressor starts Some systems have a time delay so allow at least 5 minutes See caution in section 5 Other Move switch to COOL position Replace fuse or reset circuit breaker Move switch to ON posi tion With power to furnace OFF tighten all mounting and terminal screws Re pair broken wires Exchange the thermostat See Warranty Contact service techni cian for assistance lf the thermostat set point and the thermometer reading do not agree the thermometer may need recalibration Follow the procedure below x Remove thermostat cover Set the cover on a table near an accur
12. peration for at least one cycle on both heating and air conditioning To observe C Place the system switch at HEAT position and fan switch at AUTO Move the temper ature setting lever 10 F 6 C above room temperature The heating equipment should turn cn A short warm up period may be required before the system fan turns on C Place system switch at COOL position and move temperature setting lever 10 F 6 C below room temperature The air conditioning equipment should turn on and the system fan should turn on NOTE Some systems have a time delay that can prevent opera tion up to 5 minutes Turn the fan switch to ON The system fan should turn on and operate continuously The system blower should con tinue to operate at any system switch or thermostat setting THERMOSTAT SETTING C On CT51A place the sys tem and fan switches at the desired settings for operation C On all models move the temperature setting lever to the desired temperature com fort level TROUBLESHOOTING 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 System switch at OFF or Move switch to HEAT COOL Position position Blown fuse or tripped circuit breaker Furnac
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