Owner's Manual
Page 1
... CT87Thermostat for your heating/cooling system. Registered Trademark Copyright © 2002 Honeywell All Rights Reserved 69-0274-6 No No * CT87A is right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Care at 1-800-468-1502. No Yes Electric heat furnace with... heating/cooling unit No (compressor) with no auxiliary or backup heat. CT87A,B,J Round® Thermostat LOW VOLTAGE (15 TO 30 VAC), THERMOSTAT AND MOUNTING HARDWARE 1 Verify that you have the correct thermostat Using the compatibility chart below, verify that you are unsure which model ...
... CT87Thermostat for your heating/cooling system. Registered Trademark Copyright © 2002 Honeywell All Rights Reserved 69-0274-6 No No * CT87A is right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Care at 1-800-468-1502. No Yes Electric heat furnace with... heating/cooling unit No (compressor) with no auxiliary or backup heat. CT87A,B,J Round® Thermostat LOW VOLTAGE (15 TO 30 VAC), THERMOSTAT AND MOUNTING HARDWARE 1 Verify that you have the correct thermostat Using the compatibility chart below, verify that you are unsure which model ...
Owner's Manual
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...1/2-in . drill bit • Wire cutter/stripper or sharp knife • Pencil 3 Remove the old thermostat 1. Remove the cover of your new thermostat; round head screws • Wallplate (CT87A) or subbase (CT87B, CT87J) • Cover ring (select models only). Necessary if installing on the ...• Spirit level Optional Tools • Hand or power drill with 1/16-in . Fig. 1. CT87A,B,J ROUND® THERMOSTAT 2 Prepare for your type of MERCURY SWITCH IN A THERMOSTAT system when you can be used to hide wall marks. • These Installation Instructions and the Installation...
...1/2-in . drill bit • Wire cutter/stripper or sharp knife • Pencil 3 Remove the old thermostat 1. Remove the cover of your new thermostat; round head screws • Wallplate (CT87A) or subbase (CT87B, CT87J) • Cover ring (select models only). Necessary if installing on the ...• Spirit level Optional Tools • Hand or power drill with 1/16-in . Fig. 1. CT87A,B,J ROUND® THERMOSTAT 2 Prepare for your type of MERCURY SWITCH IN A THERMOSTAT system when you can be used to hide wall marks. • These Installation Instructions and the Installation...
Owner's Manual
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... the old thermo- Installing wallplate/subbase on the wall (wallplate shown). COVER RING WALLPLATE NO. 4 X 1 INCH SHEET METAL SCREWS (2) 3 THERMOSTAT WIRING OPENING M20188 69-0274-6 Disconnect the wires from the old thermostat and wrap them around a pencil to Fig. 4 as you work. M19086 MERCURY NOTICE Fig. 3. Label the wires using the letter...
... the old thermo- Installing wallplate/subbase on the wall (wallplate shown). COVER RING WALLPLATE NO. 4 X 1 INCH SHEET METAL SCREWS (2) 3 THERMOSTAT WIRING OPENING M20188 69-0274-6 Disconnect the wires from the old thermostat and wrap them around a pencil to Fig. 4 as you work. M19086 MERCURY NOTICE Fig. 3. Label the wires using the letter...
Owner's Manual
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... until the wiring openings are on an outlet box Refer to Fig. 5 as you marked. 5. Installing wallplate/subbase on the cover ring. ROUND HEAD SCREW (2) A THERMOSTAT WIRING HOLE 1 THE TWO INNER HOLES ARE USED WITH WALLPLATE. 2 IF OUTLET BOX IS HORIZONTAL, MOUNT COVER RING IN POSITION SHOWN, BUT FASTEN WITH SCREWS... the top. 3. Use a pencil to the wall: Position so that the arrow in . Remove the wallplate/subbase and cover ring, and drill two 1/16-in. CT87A,B,J ROUND® THERMOSTAT 1. Fig. 5.
... until the wiring openings are on an outlet box Refer to Fig. 5 as you marked. 5. Installing wallplate/subbase on the cover ring. ROUND HEAD SCREW (2) A THERMOSTAT WIRING HOLE 1 THE TWO INNER HOLES ARE USED WITH WALLPLATE. 2 IF OUTLET BOX IS HORIZONTAL, MOUNT COVER RING IN POSITION SHOWN, BUT FASTEN WITH SCREWS... the top. 3. Use a pencil to the wall: Position so that the arrow in . Remove the wallplate/subbase and cover ring, and drill two 1/16-in. CT87A,B,J ROUND® THERMOSTAT 1. Fig. 5.
Owner's Manual
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.../subbase. 5 Level the wallplate or subbase IMPORTANT: The wallplate/subbase must be level to the outlet box with two 1/4in. rate thermostat temperature. 1. Leveling the wallplate. Align the screw slots on the bottom left and right sides of the cover ring. 3. screws. ...ring so that the wiring holes line up . 2. Rotate the wallplate/subbase until level as shown in . CT87A,B,J ROUND® THERMOSTAT 1. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Pull the wires through . 5. To level the subbase, use the leveling posts ...
.../subbase. 5 Level the wallplate or subbase IMPORTANT: The wallplate/subbase must be level to the outlet box with two 1/4in. rate thermostat temperature. 1. Leveling the wallplate. Align the screw slots on the bottom left and right sides of the cover ring. 3. screws. ...ring so that the wiring holes line up . 2. Rotate the wallplate/subbase until level as shown in . CT87A,B,J ROUND® THERMOSTAT 1. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Pull the wires through . 5. To level the subbase, use the leveling posts ...
Owner's Manual
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... excess wire back into the wall. 69-0274-6 6 Fig. 7. STRIP 7/16 in . [8 mm] FOR WRAPAROUND CONNECTION- CT87A,B,J ROUND® THERMOSTAT 6 Wire the thermostat 1. Fitting wires under the terminal screws. STRIP 5/16 in . [11 mm] BARRIER M1279 3. Use the wiring cross-reference table...through 13 wiring diagrams. Wiring Cross-reference Wire Label R, RH, 4, V Rc, R W, W1, H Y, Y1, M G, F B O See Fig. 13 Connect to CT87A R W Y See Fig. 9 Connect to Connect to CT87B CT87J RH R Rc W W Y Y G G B* O* P *Never attach wires to fit the wires underneath the terminal screws ...
... excess wire back into the wall. 69-0274-6 6 Fig. 7. STRIP 7/16 in . [8 mm] FOR WRAPAROUND CONNECTION- CT87A,B,J ROUND® THERMOSTAT 6 Wire the thermostat 1. Fitting wires under the terminal screws. STRIP 5/16 in . [11 mm] BARRIER M1279 3. Use the wiring cross-reference table...through 13 wiring diagrams. Wiring Cross-reference Wire Label R, RH, 4, V Rc, R W, W1, H Y, Y1, M G, F B O See Fig. 13 Connect to CT87A R W Y See Fig. 9 Connect to Connect to CT87B CT87J RH R Rc W W Y Y G G B* O* P *Never attach wires to fit the wires underneath the terminal screws ...
Owner's Manual
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CT87A,B,J ROUND® THERMOSTAT Fig. 8. CT87A for a 2-wire heating only system. CT87A for a 3-wire hot water heating only system. R Y W CT87A WALLPLATE WIRE LABELS (LETTERS ON ORIGINAL THERMOSTAT TERMINALS) R 3-WIRE W HOT WATER ZONE VALVE B M20184 Fig. 10. COOL • OFF • HEAT FAN ON RH G RC Y W AUTO • CT87B SUBBASE POWER FAN COOL TO SYSTEM HEAT JUMPER RH TO RC M20185 7 69-0274-6 CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. CT87B for a 4-wire heating/cooling system.
CT87A,B,J ROUND® THERMOSTAT Fig. 8. CT87A for a 2-wire heating only system. CT87A for a 3-wire hot water heating only system. R Y W CT87A WALLPLATE WIRE LABELS (LETTERS ON ORIGINAL THERMOSTAT TERMINALS) R 3-WIRE W HOT WATER ZONE VALVE B M20184 Fig. 10. COOL • OFF • HEAT FAN ON RH G RC Y W AUTO • CT87B SUBBASE POWER FAN COOL TO SYSTEM HEAT JUMPER RH TO RC M20185 7 69-0274-6 CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. CT87B for a 4-wire heating/cooling system.
Owner's Manual
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... COOL REVERSING VALVE TO SYSTEM HEAT PUMP COMPRESSOR DO NOT ATTACH WIRES TO BOTH B AND O 1 IF WIRES ARE ATTACHED TO Y OR W, AND P ON YOUR OLD THERMOSTAT, CONTACT YOUR LOCAL CONTRACTOR FOR FURTHER ASSISTANCE. CT87A,B,J ROUND® THERMOSTAT Fig. 11.
... COOL REVERSING VALVE TO SYSTEM HEAT PUMP COMPRESSOR DO NOT ATTACH WIRES TO BOTH B AND O 1 IF WIRES ARE ATTACHED TO Y OR W, AND P ON YOUR OLD THERMOSTAT, CONTACT YOUR LOCAL CONTRACTOR FOR FURTHER ASSISTANCE. CT87A,B,J ROUND® THERMOSTAT Fig. 11.
Owner's Manual
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CT87A,B,J ROUND® THERMOSTAT 7 Mount the thermostat 1. Using a pencil point, slide the heat anticipator indicator to 1.2 on the wallplate/subbase. 4. HEAT ANTICIPATOR INDICATOR 1.2 .6 .5 .4 .3 .2 HOLE SUITABLE FOR PENCIL POINT TO MOVE INDICATOR .15 SCALE .12 .10 M20226 3. Adjusting heat anticipator indicator. NOTE: These screws complete the installation of the thermostat...14. Tighten the three captive mounting screws as shown in Fig. 15. Pull off the thermostat cover and discard the red plastic insert that the three captive mounting screws align with the...
CT87A,B,J ROUND® THERMOSTAT 7 Mount the thermostat 1. Using a pencil point, slide the heat anticipator indicator to 1.2 on the wallplate/subbase. 4. HEAT ANTICIPATOR INDICATOR 1.2 .6 .5 .4 .3 .2 HOLE SUITABLE FOR PENCIL POINT TO MOVE INDICATOR .15 SCALE .12 .10 M20226 3. Adjusting heat anticipator indicator. NOTE: These screws complete the installation of the thermostat...14. Tighten the three captive mounting screws as shown in Fig. 15. Pull off the thermostat cover and discard the red plastic insert that the three captive mounting screws align with the...
Owner's Manual
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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. Your heating system: Steam Hot water heat High-efficiency warm air Standard warm air Electric heat Heat anticipator...1. Turn the dial until the temperature on the setting scale (Fig. 16) exceeds the room temperature that is shown on beyond the thermostat set temperature, move the heat anticipator pointer to the farthest point left. 2. Snap on the thermometer. The heating system should start....
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. Your heating system: Steam Hot water heat High-efficiency warm air Standard warm air Electric heat Heat anticipator...1. Turn the dial until the temperature on the setting scale (Fig. 16) exceeds the room temperature that is shown on beyond the thermostat set temperature, move the heat anticipator pointer to the farthest point left. 2. Snap on the thermometer. The heating system should start....
Owner's Manual
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Raise the temperature setting above room temperature. The fan runs continuously. 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... has a subbase, set the temperature, turn the dial until the pointer on the CT87J model. 2. The cooling system should stop. Heat On Auto The thermostat controls your cooling system. Lower the temperature setting below 50°F (10°C). 1. IMPORTANT: After heating is below room temperature. CT87B, J switches Switch...
Raise the temperature setting above room temperature. The fan runs continuously. 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... has a subbase, set the temperature, turn the dial until the pointer on the CT87J model. 2. The cooling system should stop. Heat On Auto The thermostat controls your cooling system. Lower the temperature setting below 50°F (10°C). 1. IMPORTANT: After heating is below room temperature. CT87B, J switches Switch...
Owner's Manual
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... the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. CT87A,B,J ROUND® THERMOSTAT Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be to repair or replace the product within a reasonable period of time. THE DURATION OF ANY...
... the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. CT87A,B,J ROUND® THERMOSTAT Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be to repair or replace the product within a reasonable period of time. THE DURATION OF ANY...