Honeywell CT87B User's Manual
Contents
1. HEAT M20225 Fig 12 CT87J for a 4 wire single stage heat pump CT87J SUBBASE HEAT FAN SYSTEM POWER COOL REVERSING VALVE HEAT REVERSING VALVE DO NOT ATTACH WIRES JUMPER W TO Y TO BOTH B ANDO M20186 Fig 13 CT87J for 4 wire single stage heat pump CT87J SUBBASE FAN POWER HEAT REVERSING VALVE COOL l TO PEN SYSTEM HEAT PUMP COMPRESSOR DO NOT ATTACH WIRES TO BOTH B ANDO A IF WIRES ARE ATTACHED TO Y OR W AND P ON YOUR OLD THERMOSTAT CONTACT YOUR LOCAL CONTRACTOR FOR FURTHER ASSISTANCE M20228 69 0274 6 8 CT87A B J ROUND THERMOSTAT 7 Mount the thermostat 1 2 Pull off the thermostat cover and discard the red plastic insert that holds the mercury switch in place during shipping Using a pencil point slide the heat anticipator indicator to 1 2 on the scale as shown in Fig 14 IMPORTANT This prevents the thermostat from being damaged Fig 14 Adjusting heat anticipator indicator HEAT ANTICIPATOR INDICATOR HOLE SUITABLE FOR PENCIL POINT TO MOVE INDICATOR M20226 Place the thermostat over the wallplate or subbase so that the three captive mounting screws align with the three raised screw holes on the wallplate subbase Tighten the three captive mounting screws as shown in Fig 12. so that the arrow in the middle of the cover ring is pointing up 2 Pull the wires through the wiring hole on the bottom left side of the cover ring 3 Align the screw slots on the cover ring with the outlet box screw holes and attach the cover ring to the outlet box with two 1 2 in screws 4 Place the wallplate or subbase over the cover ring so that the wiring holes line up and pull the wires through 5 Loosely attach the wallplate subbase to the cover ring with two 1 4 in screws through the screw holes on the left and right sides of the wallplate subbase Level the wallplate or subbase IMPORTANT The wallplate subbase must be level to maintain accu rate thermostat temperature 1 Rotate the wallplate subbase until level as shown in Fig 6 To level the subbase use the leveling posts directly below the Heat and Fan indicators Fig 6 Leveling the wallplate SPIRIT LEVELING LEVEL POSTS 2 o O OPENING FOR THERMOSTAT MOUNTING WIRING SLOTS M3319A 2 Tighten the mounting screws after making sure that the wallplate or subbase is level 5 69 0274 6 CT87A B J ROUND THERMOSTAT 6 Wire the thermostat 1 Use the wiring cross reference table below to match each old thermostat wire with its corresponding terminal on the CT87 wallplate or subbase See Fig 8 through 13 wiring diagrams Wiring Cross reference Connect to Connectto Connect to Wire Label CT87A CT87B C
3. 5 NOTE These screws complete the installation of the thermostat Fig 15 Tightening mounting screws CAPTIVE SCREWS 3 M20227 9 69 0274 6 CT87A B J ROUND THERMOSTAT 8 Set the heat anticipator for your system IMPORTANT Setting the heat anticipator allows the thermostat to maintain accurate temperature control 1 Using a pencil point move the heat anticipator pointer to the number that you recorded in Step 3 sub step 3 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 S Mig Hot water heat 0 8 High efficiency warm air 0 8 Standard warm air 0 4 Electric heat 0 3 2 Snap on the thermostat cover NOTE If the furnace stays on beyond the thermostat set temperature move the anticipator pointer down by 1 ampere If the furnace shuts off before the set temperature is reached move the anticipator pointer up by 1 ampere Never adjust the anticipator below 3 ampere 9 Check heating cooling operation Check heating 1 Turn the transparent dial to the farthest point left 2 If your CT87 has a subbase set the system switch to Heat 3 Turn the dial until the temperature on the setting scale Fig 16 exceeds the room temperature that is shown on the thermometer The heating system should start 4 Turn the dial until the temperature on th
4. Honeywell CT87A B J Round Thermostat LOW VOLTAGE 15 TO 30 VAC THERMOSTAT AND MOUNTING HARDWARE Installation Instructions 1 Verify that you have the correct thermostat Using the compatibility chart below verify that you purchased the correct CT87Thermostat for your heating cooling system If you are unsure which model is right for your system visit www honeywell com yourhome or call Honeywell Customer Care at 1 800 468 1502 Compatible with Heating Cooling system CT87A CT87B CT87J Heating only Gas or oil fueled warm air steam or hot Yes Yes No water heat Cooling only Electric air conditioning Yes Yes Yes Heating and cooling Gas or oil fueled warm air No Yes No steam or hot water heat with electric air conditioning Single stage heat pump Outdoor heating cooling unit No No Yes compressor with no auxiliary or backup heat Electric heat furnace with or without cooling No No Yes Electric baseboard Electric heating strips located just No No No above the floor usually 120 240 volts Multistage A conventional system with more than one No No No stage or an outdoor heating cooling unit compressor with auxiliary or backup heat CT87A is compatible with 2 wire cooling only systems U S Registered Trademark Copyright 2002 Honeywell All Rights Reserved 69 0274 6 CT87A B J ROUND THERMOSTAT 2 Prepare for installation 1 Car
5. T87J R RH 4V IR RH R Rc R Rc W W4 H W W W Y Y4 M Y Y Y GF G G B See Fig 9 B O O See Fig 13 P Never attach wires to both the B and O terminals 2 Strip the wire insulation as needed to fit the wires underneath the ter minal screws Fig 7 Fig 7 Fitting wires under the terminal screws FOR STRAIGHT FOR WRAPAROUND CONNECTION CONNECTION STRIP 5 16 in 8 mm STRIP 7 16 in 11 mm BARRIER M1279 3 Loosen the terminal screws and slip each wire beneath its matching terminal 4 Securely tighten the terminal screws 5 Push any excess wire back into the wall 69 0274 6 6 CT87A B J ROUND THERMOSTAT Fig 8 CT87A for a 2 wire heating only system CT87A WALLPLATE POWER TO SYSTEM HEAT M20183 Fig 9 CT87A for a 3 wire hot water heating only system CT87A WALLPLATE WIRE LABELS LETTERS ON ORIGINAL THERMOSTAT TERMINALS 3 WIRE Ww HOT WATER ZONE VALVE M20184 Fig 10 CT87B for a 4 wire heating cooling system CT87B SUBBASE POWER FAN SYSTEM COOL HEAT JUMPER Ru TO Rc M20185 69 0274 6 CT87A B J ROUND THERMOSTAT Fig 11 CT87B for a 5 wire heating cooling system CT87B SUBBASE HEATING POWER FAN SYSTEM COOLING __ POWER sysrEM COOL
6. e setting scale is below the room temperature that is shown on the thermometer The heating system should stop Fig 16 Checking heating system SETTING SCALE THERMOMETER 69 0274 6 10 CT87A B J ROUND THERMOSTAT Check cooling IMPORTANT To avoid damaging the compressor in the air conditioner do not operate the cooling system when the outdoor temperature is below 50 F 10 C 1 If your CT87 has a subbase set the System switch on the left to Cool IMPORTANT After heating is tested wait five minutes before switch ing to Cool on the CT87J model 2 Lower the temperature setting below room temperature The cooling system should start 3 Raise the temperature setting above room temperature The cooling system should stop Operation To set the temperature turn the dial until the pointer on the top setting scale aligns with the desired temperature CT87B J switches Switch Setting Result System Cool The thermostat controls your cooling system Off Both the heating and cooling systems are off Heat The thermostat controls your heating system Fan On The fan runs continuously Auto The fan runs only with the heating or cooling system 11 69 0274 6 CT87A B J ROUND THERMOSTAT Limited One Year Warranty Honeywell warrants this product excluding battery to be free from defects in the workmanship or materials under normal use and service for a period of one 1 yea
7. efully unpack your new thermostat rough handling may affect its accuracy Save your receipt and identify the following parts CT87 Thermostat Screws two 1 in sheet metal screws two 1 2 in binding head screws and two 1 4 in round head screws e Wallplate CT87A or subbase CT87B CT87J Cover ring select models only Necessary if installing on an outlet box Optional if installing directly on the wall can be used to hide wall marks These Installation Instructions and the Installation Quick Guide Wiring labels 2 Gather these tools Required Tools Optional Tools Flat blade e Hand or power drill with 1 16 in drill bit screwdriver Wire cutter stripper or sharp knife Spirit level Pencil 3 Remove the old thermostat 1 Turn off power to the heating cooling system at the main fuse circuit breaker panel 2 Remove the cover of your old thermostat You may need to unscrew the cover if it is locked on 3 Locate the heat anticipator adjustment scale and lever on the old thermostat Fig 1 Fig 1 Mercury switch location N the box below record the number that the adjustment lever points to This is the current amp rating of your heating system L4 MERCURY SWITCH Current setting 44 OLD THERMOSTAT ANTICIPATOR SCALE If you cannot find the heat anticipator setting on the old thermostat you can use a LEVER TYPICAL LOCATION OF A standard setting for yo
8. r 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 retailer where 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 USA Honeywell Canada Dock 4 MN10 3860 Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 3992 Scarborough Ontario M1V 4Z9 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 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
9. 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 any questions concerning this warranty please write Honeywell Customer Care Honeywell Inc 1985 Douglas Dr N Golden Valley MN 55422 3992 or call 1 800 468 1502 In Canada write Retail Products ON15 Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 4Z9 Honeywell Automation and Control Solutions Honeywell Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario MIV 4Z9 Printed in U S A on recycled 69 0274 6 G H Rev 08 02 G paper containing at least 10 www honeywell com yourhome post consumer paper fibers
10. ubbase If using cover ring Place the wallplate subbase over the cover ring Rotate the wallplate subbase until the wiring openings are aligned and the two screw holes on the left and right side of the wallplate subbase align with the screw holes on the cover ring You will be inserting screws through these holes into the wall If attaching wallplate directly to the wall Position so that the UP indicator on the wallplate is on top If attaching subbase directly to the wall Position so that the fan and heating cooling switches are on the top 3 Use a pencil to mark the center of the screw holes on the left and right sides of the wallplate or subbase 4 Remove the wallplate subbase and cover ring and drill two 1 16 in holes at the locations you marked 5 Reposition the cover ring if used and wallplate subbase over the holes pull the wires through the wiring opening and loosely insert the two 1 in screws into the drilled holes If installing on an outlet box Refer to Fig 5 as you work Fig 5 Installing wallplate subbase on an outlet box subbase shown 1 2 IN BINDING OUTLET BOX HEAD SCREW 2 A cover RING GEN S 1 4 IN THERMOSTAT WIRING HOLE A THE TWO INNER HOLES ARE USED WITH WALLPLATE A IF OUTLET BOX IS HORIZONTAL MOUNT COVER RING IN POSITION SHOWN BUT FASTEN WITH SCREWS THROUGH A M20187 69 0274 6 4 CT87A B J ROUND THERMOSTAT 1 Place the cover ring against the outlet box
11. ur type of MERCURY SWITCH IN system when you reach Step 8 of A THERMOSTAT m2206 this installation 4 Unscrew and remove the old thermostat wallplate from the wall but do not disconnect the wires 69 0274 6 2 CT87A B J ROUND THERMOSTAT 5 Label the wires using the wiring labels that came with the CT87 Identify each wire using the letter of the terminal on the old thermo stat Fig 2 Do not label the wires by color 6 Disconnect the wires from the old thermostat and wrap them around a pencil to keep them from falling back into the wall Fig 3 MERCURY NOTICE If this thermostat is replacing a control that contains mercury ina sealed tube do not place your old control in the trash Contact your local waste management authority Fig 2 Labeling wires WIRES THROUGH WALL OPENING M20133 for instructions regarding recycling and the proper disposal of this control or of an old control containing mercury in a sealed tube Install the cover ring and wallplate or subbase If installing on the wall Refer to Fig 4 as you work Fig 4 Installing wallplate subbase on the wall wallplate shown COVER RING NO 4 X 1 INCH SHEET METAL SCREWS 2 THERMOSTAT WIRING OPENING M20188 69 0274 6 CT87A B J ROUND THERMOSTAT 1 If using the cover ring Position the cover ring against the wall so that the arrow in the middle of the cover ring is pointing up 2 Position the wallplate or s
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