Owner's Manual
Page 1
...Honeywell All Rights Reserved 69-0274-6 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 is compatible with 2-wire cooling-only systems. ® U.S. Installation Instructions Compatible with: Heating/Cooling system CT87A CT87B.../cooling unit No (compressor) with auxiliary or backup heat. No No * CT87A is right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Care at 1-800-468-1502.
...Honeywell All Rights Reserved 69-0274-6 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 is compatible with 2-wire cooling-only systems. ® U.S. Installation Instructions Compatible with: Heating/Cooling system CT87A CT87B.../cooling unit No (compressor) with auxiliary or backup heat. No No * CT87A is right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Care at 1-800-468-1502.
Owner's Manual
Page 2
rough handling may need to unscrew the cover if it is the current (amp) MERCURY SWITCH rating of your old thermostat. round head screws • Wallplate (CT87A) or subbase (CT87B, CT87J) • Cover ring (select models only). can use a TYPICAL LOCATION OF A standard setting for installation 1. Gather these tools: Required Tools • Flat blade screwdriver...
rough handling may need to unscrew the cover if it is the current (amp) MERCURY SWITCH rating of your old thermostat. round head screws • Wallplate (CT87A) or subbase (CT87B, CT87J) • Cover ring (select models only). can use a TYPICAL LOCATION OF A standard setting for installation 1. Gather these tools: Required Tools • Flat blade screwdriver...
Owner's Manual
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...a pencil to Fig. 4 as you work. Wrapping wires. Disconnect the wires from falling back into the wall (Fig. 3). CT87A,B,J ROUND® THERMOSTAT 5. Labeling wires. COVER RING WALLPLATE NO. 4 X 1 INCH SHEET METAL SCREWS (2) 3 THERMOSTAT WIRING OPENING M20188 69-0274-6 Fig. 2. WIRES THROUGH WALL OPENING If this control, or of the terminal on the wall... mercury in a sealed tube, do not place your M20133 local waste management authority for instructions regarding recycling and the proper disposal of this thermostat is replacing a control that came with the CT87.
...a pencil to Fig. 4 as you work. Wrapping wires. Disconnect the wires from falling back into the wall (Fig. 3). CT87A,B,J ROUND® THERMOSTAT 5. Labeling wires. COVER RING WALLPLATE NO. 4 X 1 INCH SHEET METAL SCREWS (2) 3 THERMOSTAT WIRING OPENING M20188 69-0274-6 Fig. 2. WIRES THROUGH WALL OPENING If this control, or of the terminal on the wall... mercury in a sealed tube, do not place your M20133 local waste management authority for instructions regarding recycling and the proper disposal of this thermostat is replacing a control that came with the CT87.
Owner's Manual
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CT87A,B,J ROUND® THERMOSTAT 1. If installing on an outlet box Refer to Fig. 5 as you marked. 5. M20187 69-0274-6 4 If using cover ring: Place the wallplate/subbase over the holes, pull the wires through these holes into the drilled holes. holes at the locations you work. ROUND HEAD SCREW (2) A THERMOSTAT WIRING HOLE 1 THE TWO INNER HOLES...
CT87A,B,J ROUND® THERMOSTAT 1. If installing on an outlet box Refer to Fig. 5 as you marked. 5. M20187 69-0274-6 4 If using cover ring: Place the wallplate/subbase over the holes, pull the wires through these holes into the drilled holes. holes at the locations you work. ROUND HEAD SCREW (2) A THERMOSTAT WIRING HOLE 1 THE TWO INNER HOLES...
Owner's Manual
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... box screw holes, and attach the cover ring to the cover ring with two 1/2-in Fig. 6. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Place the wallplate or subbase over the cover ring so that the wiring holes line up . 2. Rotate the wallplate...on the left side of the cover ring. 3. To level the subbase, use the leveling posts directly below the Heat and Fan indicators. CT87A,B,J ROUND® THERMOSTAT 1. Place the cover ring against the outlet box so that the wallplate or subbase is pointing up , and pull the wires through. 5....
... box screw holes, and attach the cover ring to the cover ring with two 1/2-in Fig. 6. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Place the wallplate or subbase over the cover ring so that the wiring holes line up . 2. Rotate the wallplate...on the left side of the cover ring. 3. To level the subbase, use the leveling posts directly below the Heat and Fan indicators. CT87A,B,J ROUND® THERMOSTAT 1. Place the cover ring against the outlet box so that the wallplate or subbase is pointing up , and pull the wires through. 5....
Owner's Manual
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... 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 (Fig. 7). STRIP...thermostat wire with its matching terminal. 4. Use the wiring cross-reference table below to match each wire beneath its corresponding terminal on the CT87 wallplate or subbase. FOR STRAIGHT CONNECTION- Fitting wires under the terminal screws. CT87A,B,J ROUND® THERMOSTAT 6 Wire the thermostat...
... 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 (Fig. 7). STRIP...thermostat wire with its matching terminal. 4. Use the wiring cross-reference table below to match each wire beneath its corresponding terminal on the CT87 wallplate or subbase. FOR STRAIGHT CONNECTION- Fitting wires under the terminal screws. CT87A,B,J ROUND® THERMOSTAT 6 Wire the thermostat...
Owner's Manual
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CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. 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,B,J ROUND® THERMOSTAT Fig. 8. CT87A for a 4-wire heating/cooling 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. CT87B for a 3-wire hot water heating only system. CT87A for a 2-wire heating only system.
CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. 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,B,J ROUND® THERMOSTAT Fig. 8. CT87A for a 4-wire heating/cooling 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. CT87B for a 3-wire hot water heating only system. CT87A for a 2-wire heating only system.
Owner's Manual
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.... M20228 69-0274-6 8 CT87J for 4-wire single stage heat pump. COOL • OFF • HEAT FAN ON RH G RC Y W AUTO • CT87B SUBBASE HEATING POWER FAN TO SYSTEM COOLING POWER TO SYSTEM COOL HEAT Fig. 12. CT87J for a 4-wire single stage heat pump. CT87A,B,J ROUND® THERMOSTAT Fig. 11. CT87B for a 5-wire heating/cooling system.
.... M20228 69-0274-6 8 CT87J for 4-wire single stage heat pump. COOL • OFF • HEAT FAN ON RH G RC Y W AUTO • CT87B SUBBASE HEATING POWER FAN TO SYSTEM COOLING POWER TO SYSTEM COOL HEAT Fig. 12. CT87J for a 4-wire single stage heat pump. CT87A,B,J ROUND® THERMOSTAT Fig. 11. CT87B for a 5-wire heating/cooling system.
Owner's Manual
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...captive mounting screws as shown in Fig. 14. Tightening mounting screws. NOTE: These screws complete the installation of the thermostat. Using a pencil point, slide the heat anticipator indicator to 1.2 on the wallplate/subbase. 4. Fig. 14....thermostat over the wallplate or subbase so that holds the mercury switch in Fig. 15. Pull off the thermostat cover and discard the red plastic insert that the three captive mounting screws align with the three raised screw holes on the scale as shown in place during shipping. 2. CT87A,B,J ROUND® THERMOSTAT 7 Mount the thermostat...
...captive mounting screws as shown in Fig. 14. Tightening mounting screws. NOTE: These screws complete the installation of the thermostat. Using a pencil point, slide the heat anticipator indicator to 1.2 on the wallplate/subbase. 4. Fig. 14....thermostat over the wallplate or subbase so that holds the mercury switch in Fig. 15. Pull off the thermostat cover and discard the red plastic insert that the three captive mounting screws align with the three raised screw holes on the scale as shown in place during shipping. 2. CT87A,B,J ROUND® THERMOSTAT 7 Mount the thermostat...
Owner's Manual
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... 3. Snap on the thermometer. Turn the dial until the temperature on the setting scale is shown on the thermostat cover. The heating system should start. 4. CT87A,B,J ROUND® THERMOSTAT 8 Set the heat anticipator for your type of system shown in Step 3, sub-step 3. Checking heating system.... If you could not find the anticipator setting on the old thermostat, use the setting for your CT87 has a ...
... 3. Snap on the thermometer. Turn the dial until the temperature on the setting scale is shown on the thermostat cover. The heating system should start. 4. CT87A,B,J ROUND® THERMOSTAT 8 Set the heat anticipator for your type of system shown in Step 3, sub-step 3. Checking heating system.... If you could not find the anticipator setting on the old thermostat, use the setting for your CT87 has a ...
Owner's Manual
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Raise the temperature setting above room temperature. Heat On Auto The thermostat controls your cooling system. CT87B, J switches Switch System Fan Setting Result Cool Off The thermostat controls your heating system. The fan runs continuously. The fan runs only with the desired...or cooling system. 11 69-0274-6 The cooling system should start. 3. IMPORTANT: After heating is below room temperature. 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 ...
Raise the temperature setting above room temperature. Heat On Auto The thermostat controls your cooling system. CT87B, J switches Switch System Fan Setting Result Cool Off The thermostat controls your heating system. The fan runs continuously. The fan runs only with the desired...or cooling system. 11 69-0274-6 The cooling system should start. 3. IMPORTANT: After heating is below room temperature. 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 ...
Owner's Manual
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... by damage which occurred while the product was in U.S.A. Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-0274-6 G.H. CT87A,B,J ROUND® THERMOSTAT Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be to repair or replace the...
... by damage which occurred while the product was in U.S.A. Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-0274-6 G.H. CT87A,B,J ROUND® THERMOSTAT Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be to repair or replace the...
