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Honeywell CT87A manual

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Table of contents for the manual

  • Page 1

    ® U.S. Registered Trademark Copyright © 2002 Honeywell All Rights Reserved 69-0274-6 Verify that you have the correct thermostat Using the compatibility chart below , verify that you purchased the correct CT87 Thermostat for your heating/cooling system. If you are unsure which model is right for your system, visit www .honeywell.com/ yourhome or [...]

  • Page 2

    CT87A,B,J ROUND® THERMOSTAT 69-0274-6 2 Prepare for installation 1. Carefully unpack your new thermostat; rough handling may affect it s 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 • W allplate (CT8 [...]

  • Page 3

    CT87A,B,J ROUND® THERMOSTAT 3 69-0274-6 5. Label the wires using the wiring labels that came with the CT87. Identify each wire using the letter of the terminal on th e old the rmo- stat (Fig. 2). Do not label the wires by color . 6. Disconnect the wires from the o ld thermostat and wrap them around a pencil to keep them from falling back into the [...]

  • Page 4

    CT87A,B,J ROUND® THERMOSTAT 69-0274-6 4 1. If using the cover ring: Position the cover ring again st the wall so that the arrow in the middle of th e cover ring is pointing up. 2. Position the wallp late or subbase . • If using cover ring : Place the wallplate/subbase over the cover ring. Rotate the wallpl ate/subbase until the wiring o penings [...]

  • Page 5

    CT87A,B,J ROUND® THERMOSTAT 5 69-0274-6 1. Place the cover ring against the outlet box 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 ou[...]

  • Page 6

    CT87A,B,J ROUND® THERMOSTAT 69-0274-6 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 wallpl ate or subbase. See Fig. 8 through 13 wiring diagrams. *Never attach wires to both the B and O terminals. 2. S trip the wire insulation as needed to fit the w[...]

  • Page 7

    CT87A,B,J ROUND® THERMOSTAT 7 69-0274-6 Fig. 8. CT87A for a 2-wire heat ing only system. Fig. 9. CT87A for a 3-wire hot water heating only system . Fig. 10. CT87B for a 4-wire heat ing/cooling system . M2018 3 CT87A WALLPLATE TO SYSTEM R W Y POWER HEAT M2018 4 WIRE LABELS (LETTERS ON ORIGINAL THERMOSTAT TERMINALS) CT87A WALLPLATE 3-WIRE HOT WATER [...]

  • Page 8

    CT87A,B,J ROUND® THERMOSTAT 69-0274-6 8 Fig. 1 1. CT87B for a 5-wire heating /cooling system. Fig. 12. CT87J for a 4-wire single stage heat pump. Fig. 13. CT87J for 4-wire single stage heat pump. C O O L • O F F • H E A T F A N O N • A U T O M2022 5 HEATING POWER CT87B SUBBASE TO SYSTE M TO SYSTEM R H G R C W Y FAN HEAT COOLING POWER COOL C [...]

  • Page 9

    CT87A,B,J ROUND® THERMOSTAT 9 69-0274-6 Mount the thermostat 1. Pull off the thermostat cover and discard the red plastic insert that holds the mercury switch in place during shipping. 2. Using a pencil po int, slide the heat anticipator indicato r to 1.2 on the scale as shown in Fig. 14. IMPORT ANT : This prevents the thermostat from being damage[...]

  • Page 10

    CT87A,B,J ROUND® THERMOSTAT 69-0274-6 10 Set the heat anticipator for your system IMPORT ANT : Setting th e heat anticipator allows the thermostat to maintain accurate temperature control. 1. Using a pencil point, move the heat anticipator pointer to the numbe r that you recorded in S tep 3, su b- step 3. If you could not find the anticipator sett[...]

  • Page 11

    CT87A,B,J ROUND® THERMOSTAT 1 1 69-0274 -6 Check cooling IMPORT ANT : T o a void damaging the compressor in the air conditioner , do not operate the cooling system when the outdoor temp erature is below 50°F (10°C). 1. If your CT87 has a subbase, set the System switch on the left to Cool. IMPORT ANT : Af ter heating is teste d, wait five minutes[...]

  • Page 12

    CT87A,B,J ROUND® THERMOSTAT 69-0274-6 G .H. Rev . 08-02 www .honeywell.com/yourhome Automation and Control Solutions Honeywell Honeywell Limi ted-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. H[...]