Owner's Manual
Page 1
... right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Care at 1-800-468-1502. Installation Instructions Compatible with: Heating/Cooling system CT87A CT87B CT87J Heating only: Gas or oil fueled warm air, steam, or hot Yes water heat Yes No Cooling only... or an outdoor heating/cooling unit (compressor) with 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 is ...
... right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Care at 1-800-468-1502. Installation Instructions Compatible with: Heating/Cooling system CT87A CT87B CT87J Heating only: Gas or oil fueled warm air, steam, or hot Yes water heat Yes No Cooling only... or an outdoor heating/cooling unit (compressor) with 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 is ...
Owner's Manual
Page 2
... an outlet box. round head screws • Wallplate (CT87A) or subbase (CT87B, CT87J) • Cover ring (select models only). CT87A,B,J ROUND® THERMOSTAT 2 Prepare for your type of MERCURY SWITCH IN A THERMOSTAT system when you reach Step 8 of your old thermostat. Necessary if installing on the old thermostat, you can be used to unscrew the cover if...
... an outlet box. round head screws • Wallplate (CT87A) or subbase (CT87B, CT87J) • Cover ring (select models only). CT87A,B,J ROUND® THERMOSTAT 2 Prepare for your type of MERCURY SWITCH IN A THERMOSTAT system when you reach Step 8 of your old thermostat. Necessary if installing on the old thermostat, you can be used to unscrew the cover if...
Owner's Manual
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... into the wall (Fig. 3). Fig. 2. stat (Fig. 2). M19086 MERCURY NOTICE Fig. 3. WIRES THROUGH WALL OPENING If this thermostat is replacing a control that came with the CT87. Do not label the wires by color. 6. Label the wires using the letter ...wallplate or subbase If installing on the wall (wallplate shown). CT87A,B,J ROUND® THERMOSTAT 5. Fig. 4. Labeling wires. 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...
... into the wall (Fig. 3). Fig. 2. stat (Fig. 2). M19086 MERCURY NOTICE Fig. 3. WIRES THROUGH WALL OPENING If this thermostat is replacing a control that came with the CT87. Do not label the wires by color. 6. Label the wires using the letter ...wallplate or subbase If installing on the wall (wallplate shown). CT87A,B,J ROUND® THERMOSTAT 5. Fig. 4. Labeling wires. 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...
Owner's Manual
Page 4
...the left and right side of the wallplate/subbase align with the screw holes on the cover ring. holes at the locations you work. CT87A,B,J ROUND® THERMOSTAT 1. Use a pencil to the wall: Position so that the UP indicator on the top. 3. Remove the wallplate/subbase and cover ring,... and drill two 1/16-in the middle of the wallplate or subbase. 4. 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 ...
...the left and right side of the wallplate/subbase align with the screw holes on the cover ring. holes at the locations you work. CT87A,B,J ROUND® THERMOSTAT 1. Use a pencil to the wall: Position so that the UP indicator on the top. 3. Remove the wallplate/subbase and cover ring,... and drill two 1/16-in the middle of the wallplate or subbase. 4. 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 ...
Owner's Manual
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...6. Place the wallplate or subbase over the cover ring so that the wallplate or subbase is pointing up , and pull the wires through. 5. rate thermostat temperature. 1. screws. 4. Rotate the wallplate/subbase until level as shown in the middle of the cover ring is level. 5 69-0274-6 Fig. .... Align the screw slots on the cover ring with the outlet box screw holes, and attach the cover ring to maintain accu- CT87A,B,J ROUND® THERMOSTAT 1. screws, through the wiring hole on the left side of the wallplate/subbase. 5 Level the wallplate or subbase IMPORTANT: The ...
...6. Place the wallplate or subbase over the cover ring so that the wallplate or subbase is pointing up , and pull the wires through. 5. rate thermostat temperature. 1. screws. 4. Rotate the wallplate/subbase until level as shown in the middle of the cover ring is level. 5 69-0274-6 Fig. .... Align the screw slots on the cover ring with the outlet box screw holes, and attach the cover ring to maintain accu- CT87A,B,J ROUND® THERMOSTAT 1. screws, through the wiring hole on the left side of the wallplate/subbase. 5 Level the wallplate or subbase IMPORTANT: The ...
Owner's Manual
Page 6
... 4. Fitting wires under the terminal screws. FOR STRAIGHT CONNECTION- STRIP 7/16 in . [8 mm] FOR WRAPAROUND CONNECTION- CT87A,B,J ROUND® THERMOSTAT 6 Wire the thermostat 1. Securely tighten the terminal screws. 5. Use the wiring cross-reference table below to fit the wires underneath the terminal ... 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 both the B and O terminals. 2.
... 4. Fitting wires under the terminal screws. FOR STRAIGHT CONNECTION- STRIP 7/16 in . [8 mm] FOR WRAPAROUND CONNECTION- CT87A,B,J ROUND® THERMOSTAT 6 Wire the thermostat 1. Securely tighten the terminal screws. 5. Use the wiring cross-reference table below to fit the wires underneath the terminal ... 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 both the B and O terminals. 2.
Owner's Manual
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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 2-wire heating only system. 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. CT87A for a 4-wire heating/cooling system. CT87A,B,J ROUND® THERMOSTAT Fig. 8. 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. CT87B for a 2-wire heating only system. 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. CT87A for a 4-wire heating/cooling system. CT87A,B,J ROUND® THERMOSTAT Fig. 8. CT87A for a 3-wire hot water heating only system.
Owner's Manual
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... 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. CT87A,B,J ROUND® THERMOSTAT Fig. 11.
... 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. CT87A,B,J ROUND® THERMOSTAT Fig. 11.
Owner's Manual
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... 14. Fig. 15. Tightening mounting screws. Place the thermostat over the wallplate or subbase so that holds the mercury switch in Fig. 15. IMPORTANT: This prevents the thermostat from being damaged. Using a pencil point, slide the heat... anticipator indicator to 1.2 on the wallplate/subbase. 4. NOTE: These screws complete the installation of the thermostat. CAPTIVE SCREWS (3) M20227 9 69-0274-6 Fig. 14. CT87A,B,J ROUND® THERMOSTAT 7 Mount the thermostat 1. HEAT ANTICIPATOR INDICATOR 1.2 .6 .5 .4 .3 .2 HOLE SUITABLE FOR PENCIL POINT TO MOVE INDICATOR ....
... 14. Fig. 15. Tightening mounting screws. Place the thermostat over the wallplate or subbase so that holds the mercury switch in Fig. 15. IMPORTANT: This prevents the thermostat from being damaged. Using a pencil point, slide the heat... anticipator indicator to 1.2 on the wallplate/subbase. 4. NOTE: These screws complete the installation of the thermostat. CAPTIVE SCREWS (3) M20227 9 69-0274-6 Fig. 14. CT87A,B,J ROUND® THERMOSTAT 7 Mount the thermostat 1. HEAT ANTICIPATOR INDICATOR 1.2 .6 .5 .4 .3 .2 HOLE SUITABLE FOR PENCIL POINT TO MOVE INDICATOR ....
Owner's Manual
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...the number that you could not find the anticipator setting on the thermometer. Turn the dial until the temperature on beyond the thermostat set the system switch to maintain accurate temperature control. 1. If you recorded in the table below. Never adjust the anticipator ...before the set temperature is below .3 ampere. 9 Check heating/cooling operation Check heating 1. SETTING SCALE 69-0274-6 THERMOMETER 10 M9656 CT87A,B,J ROUND® THERMOSTAT 8 Set the heat anticipator for your type of system shown in Step 3, sub-step 3. Your heating system: Steam Hot water ...
...the number that you could not find the anticipator setting on the thermometer. Turn the dial until the temperature on beyond the thermostat set the system switch to maintain accurate temperature control. 1. If you recorded in the table below. Never adjust the anticipator ...before the set temperature is below .3 ampere. 9 Check heating/cooling operation Check heating 1. SETTING SCALE 69-0274-6 THERMOMETER 10 M9656 CT87A,B,J ROUND® THERMOSTAT 8 Set the heat anticipator for your type of system shown in Step 3, sub-step 3. Your heating system: Steam Hot water ...
Owner's Manual
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.... IMPORTANT: After heating is below room temperature. Both the heating and cooling systems are off. CT87B, J switches Switch System Fan Setting Result Cool Off The thermostat controls your heating system. Operation To set the System switch on the left to Cool on the... the dial until the pointer on the CT87J model. 2. Heat On Auto The thermostat controls your cooling system. The fan runs continuously. The cooling system should start. 3. CT87A,B,J ROUND® THERMOSTAT Check cooling IMPORTANT: To avoid damaging the compressor in the air conditioner, do not...
.... IMPORTANT: After heating is below room temperature. Both the heating and cooling systems are off. CT87B, J switches Switch System Fan Setting Result Cool Off The thermostat controls your heating system. Operation To set the System switch on the left to Cool on the... the dial until the pointer on the CT87J model. 2. Heat On Auto The thermostat controls your cooling system. The fan runs continuously. The cooling system should start. 3. CT87A,B,J ROUND® THERMOSTAT Check cooling IMPORTANT: To avoid damaging the compressor in the air conditioner, do not...
Owner's Manual
Page 12
..., or call 1-800-468-1502. In Canada, write Retail Products ON15, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. CT87A,B,J ROUND® THERMOSTAT Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be to repair or replace the...
..., or call 1-800-468-1502. In Canada, write Retail Products ON15, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. CT87A,B,J ROUND® THERMOSTAT Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be to repair or replace the...