Honeywell CT70A User's Manual
Contents
1. 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 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 FORA 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 Assistance Center Honeywell Inc P O Box 524 Minneapolis MN 55440 0524 or call 1 800 468 1502 Monday Friday 7 00 a m 5 30 p m Central time In Canada write Retail Products ON15 02H Honeywell Limited Honeywell Limit e 740 Ellesmere Road Scarborough Ontario M1P 2V9 5 69 0846 Honeywell2. and bottom with one hand Pull outward on bottom edge of the cover until it snaps free of the thermostat base Carefully remove and save the packing material surrounding the mercury switches Make a note here of that anticipator setting for reference in setting the anticipator on your new thermostat The heat anticipator pointer if adjustable will be set at one of a series of numbers representing the current rating for the primary control of your heat pump The number will be one of the following 2 4 8 etc or 0 2 0 4 0 8 etc If no heat anticipator indication is showing do not be concerned for now go on to the next step Loosen screws holding thermostat base to wall and lift away Disconnect wires from old thermostat As you disconnect each wire tape the end and label it with the enclosed wiring labels to make reconnection to new thermostat easier Check the old insulation for cracks nicks or fraying and apply high quality plastic tape where necessary for adequate insulation Retain the old thermostat for reference purposes and until your new thermostat is functioning smoothly Run wiring if necessary to the location If the wiring is plastered into the wall make a hole next to the cable and loosen the wires so that they can be pushed back into the wall later Thread wires through the hole in packing material saved above Connect the wires to the terminals on
3. questions call Honeywell Inc at 1 800 468 1502 Make certain that your home s heat pump system is working especially if it has been inoperative for a length of time If the system does not work contact your local heating dealer for assistance Carefully unpack your new thermostat Save packages of screws instructions receipt and proof of purchase 31 3 355 101 00 g 355 83 gt 11 4 119 wl E 2 5 52 al EM HEAT HEAT OFF COOL o o o woo S M 8 94 Printed in U S A W AUTO ON ee M7306 Honeywell Inc 1994 Form Number 69 0846 3 REMOVE OLD THERMOSTAT F WARNING Begin by turning off power to the heat pump at the main service panel 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 Before removing the old thermostat from the wall look at it carefully to locate the heat anticipator adjustment mechanism See illustration to help you recognize the heat anticipator MERCURY ee SWITCH TA SCALE So Ae ICIPATOR SETTING LEVER 4 WIRE AND MOUNT NEW THERMOSTAT This thermostat can be mounted directly to the wall or on a horizontal outlet box Choose the method that best fits your installation Grasp the thermostat cover at the top
4. the back of the thermostat according to the labels you placed on the wires or as shown in the wiring diagram EXI pio e CHANGEOVER RELAY COOL SYSTEM FAN RELAY Es EM HEAT RELAY Be AUX HEAT DO RELAY a LS nmm CHANGEOVER RELAY HEAT A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A REMOVE W1 Y1 JUMPER WHEN HEAT RELAY 1 IS USED foo HEAT RELAY 1 COMPRESSOR CONTACTOR A WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR EM HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION A X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION 69 0846 M8447 Push the excess wire back through the hole and plug any opening with packing material to prevent drafts that may affect thermostat performance Loosely secure the thermostat to the wall or outlet box with screws through the two mounting holes at the middle of the device The sheetmetal screws included with the thermostat are designed for use in plaster walls that do not need anchors 5 CHECK OUT THERMOSTAT Turn on the power to the heat pump system To check heating move the system switch on the thermostat to HEAT and the fan switch to AUTO Move the set point lever to about 10 F 6 C above room temperature Heating should start and the fan should run Move the set point lever about 10 F 6 C below room temperatu
5. Honeywell Installation Instructions Thermometer Scale Range 45 F to 85 F 7 C to 29 C Electrical Ratings 24 to 27 Vac Do It Yourself Models Your Honeywell Thermostat Your new Honeywell CT70A Heat Pump Thermostat provides low voltage 24 Vac control of two stage heating and one stage cooling in heat pump systems using manual changeover Light emitting diodes LEDs provide emergency heat and auxiliary heat indication Recycling Notice Ch This control contains mercury in a sealed tube Do not place control in the trash at the end of its useful life 1 PREPARATION Your Honeywell thermostat should be properly installed if you follow these instructions step by step It is recommended that as you read understand and complete each step you check Y it off with pencil or pen Check thermostat suitability for your home s system by reviewing the ratings listed on the front of these instructions and reviewing the CT70 Heat Pump Thermo stat Wiring Guide enclosed 2 THERMOSTAT MOUNTING DIMENSIONS CT70A Heat Pump Thermostat Honeywell A ouen Her or com ran aro on If this control is replacing a control that contains mercury in a sealed tube do not place your old control in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control or of an old control containing mercury in a sealed tube If you have
6. he compressor starts Some systems have a time delay so allow at least five minutes See NOTE in step 5 Contact service technician for assistance Limited One 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 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 hardware or home center store 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 Inc RG Department in Canada Honeywell Limited Honeywell Limit e 1050 Berkshire Lane 740 Ellesmere Road Plymouth MN 55441 4437 Scarborough Ontario M1P 2V9 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
7. k fan move the system switch to OFF and the fan switch to ON The fan should run continu ously Move the fan switch to AUTO In this position the fan operates in response to the thermostat in both heating and cooling HEAT Heat pump equipment is providing warm air to the living space OFF All heating cooling equipment is de energized COOL Heat pump equipment is providing cool air to the living space The fan switching positions control the fan operation as follows AUTO The fan operates in response to the thermostat in both heating and cooling ON The fan operates continuously 69 0846 7 TROUBLESHOOTING Your Honeywell thermostat requires little or no attention Most problems can generally be traced to the following Compressor doesn t provide warm air Compressor will not stop delivering warm air Thermostat setting and thermometer reading disagree Compressor doesn t provide cool air 69 0846 Equipment has compressor Wait five minutes and check for heat protection time delay System switch at OFF or COOL Move switch to HEAT position position Blown fuse or tripped circuit Replace fuse or reset circuit breaker breaker Heat pump power switch is at Switch to ON OFF Improper connections to With power to furnace at OFF tighten all mounting and thermostat terminal screws Repair frayed or broken wires Defective thermostat Here s Exchange the thermostat see Warranty how
8. re Heating and fan should shut off NOTE To prevent compressor short cycling a minimum off timer may be included to prevent the compressor from starting for up to five minutes from when the thermostat last turned off the compressor or from when the system first received power 6 SETTING THERMOSTAT Move the set point lever to the desired control point on the temperature scale Move the system switch and fan switch to the desired operating positions The system switching positions control the system operation as follows EM HT Emergency heat relay is energized Cooling system is off Compressor is de energized Fan runs on call for heat if fan switch is in AUTO position EM HT LED is on continuously Exactly level the thermostat using a spirit level or plumb line An incorrectly leveled thermostat will cause inaccurate temperature control Tighten the two mounting screws at the middle of the device Install two screws in top mounting holes and tighten Replace the thermostat cover Check cooling only if outdoor temperature is at least 50 F 10 C To check cooling move the system switch on the thermostat to COOL and the fan switch to AUTO Move the set point lever about 10 F 6 C below room temperature Cooling and fan should start see NOTE above Move the set point lever about 10 F 6 C above room temperature Cooling and fan should shut off To chec
9. you know as the thermostat from the wall Disconnect wire from W1 terminal Touch W1 wire to terminal R The thermostat is defective if the compressor starts Some systems have a time delay so allow five minutes See step 5 Contact a qualified service technician for assistance Turn temperature setting lever Heater should start to cool within minutes If not turn off all the way down power at the main service panel and contact qualified service technician Thermostat is not level Recheck the thermostat position on the wall Use level to make sure it is level See step 4 Thermostat affected by drafts or Contact a qualified service technician to change the radiant heat location The thermostat should be about 5 ft 1 5m above the floor and on an inside wall Equipment has compressor Wait five minutes and check for cool protection time delay System switch is in OFF or Move switch to COOL position HEAT position Blown fuse or tripped circuit Replace fuse or reset circuit breaker breaker Compressor switch located Move switch to ON position outdoors is at OFF Improper connections to With power to heat pump OFF tighten all mounting and thermostat terminal screws Repair broken wires Defective thermostat Here s Exchange the thermostat See Warranty how you know Stas the thermostat from the wall Disconnect wire from Y1 terminal Touch Y1 wire to terminal R The thermostat is defective if t
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