Installation Instructions
Page 1
... stage heat pump: Outdoor heating/cooling unit No (compressor) with 2-wire cooling-only systems. ® U.S. Registered Trademark Copyright © 2002 Honeywell All Rights Reserved 69-0274-6 If you purchased the correct CT87Thermostat for your heating/cooling system. No Yes Electric heat furnace ... A conventional system with more than one No stage, 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 ...
... stage heat pump: Outdoor heating/cooling unit No (compressor) with 2-wire cooling-only systems. ® U.S. Registered Trademark Copyright © 2002 Honeywell All Rights Reserved 69-0274-6 If you purchased the correct CT87Thermostat for your heating/cooling system. No Yes Electric heat furnace ... A conventional system with more than one No stage, 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 ...
Installation Instructions
Page 2
... • Hand or power drill with 1/16-in . Mercury switch location. Remove the cover of your heating system. CT87A,B,J ROUND® THERMOSTAT 2 Prepare for your type of MERCURY SWITCH IN A THERMOSTAT system when you can be used to . Locate the heat anticipator adjustment scale and lever on . 3. Carefully unpack your new thermostat; sheet metal screws, two 1/2-in . You may affect...
... • Hand or power drill with 1/16-in . Mercury switch location. Remove the cover of your heating system. CT87A,B,J ROUND® THERMOSTAT 2 Prepare for your type of MERCURY SWITCH IN A THERMOSTAT system when you can be used to . Locate the heat anticipator adjustment scale and lever on . 3. Carefully unpack your new thermostat; sheet metal screws, two 1/2-in . You may affect...
Installation Instructions
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...69-0274-6 4 Position the wallplate or subbase. • If using the cover ring: Position the cover ring against the wall so that the fan and heating/cooling switches are aligned and the two screw holes on the left and right sides of the wallplate/subbase align with the screw holes on...the cover ring. holes at the locations you work. If installing on top. • If attaching subbase directly to Fig. 5 as you marked. 5. Fig. 5. CT87A,B,J ROUND® THERMOSTAT 1. Rotate the wallplate/subbase until the wiring openings are on the left and right side of the wallplate or subbase...
...69-0274-6 4 Position the wallplate or subbase. • If using the cover ring: Position the cover ring against the wall so that the fan and heating/cooling switches are aligned and the two screw holes on the left and right sides of the wallplate/subbase align with the screw holes on...the cover ring. holes at the locations you work. If installing on top. • If attaching subbase directly to Fig. 5 as you marked. 5. Fig. 5. CT87A,B,J ROUND® THERMOSTAT 1. Rotate the wallplate/subbase until the wiring openings are on the left and right side of the wallplate or subbase...
Installation Instructions
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... below the Heat and Fan indicators. Tighten the mounting screws after making sure that the arrow in the middle of the cover ring is level. 5 69-0274-6 Place the wallplate or subbase over the cover ring so that the wiring holes line up . 2. CT87A,B,J ROUND® THERMOSTAT 1. Pull ...on the cover ring with the outlet box screw holes, and attach the cover ring to the outlet box with two 1/4in. screws. 4. rate thermostat temperature. 1. Leveling the wallplate. screws, through . 5. Rotate the wallplate/subbase until level as shown in . Align the screw slots on the left...
... below the Heat and Fan indicators. Tighten the mounting screws after making sure that the arrow in the middle of the cover ring is level. 5 69-0274-6 Place the wallplate or subbase over the cover ring so that the wiring holes line up . 2. CT87A,B,J ROUND® THERMOSTAT 1. Pull ...on the cover ring with the outlet box screw holes, and attach the cover ring to the outlet box with two 1/4in. screws. 4. rate thermostat temperature. 1. Leveling the wallplate. screws, through . 5. Rotate the wallplate/subbase until level as shown in . Align the screw slots on the left...
Installation Instructions
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CT87A for a 2-wire heating only system. CT87A for a 3-wire hot water heating only system. CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. 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 4-wire heating/cooling 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,B,J ROUND® THERMOSTAT Fig. 8.
CT87A for a 2-wire heating only system. CT87A for a 3-wire hot water heating only system. CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. 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 4-wire heating/cooling 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,B,J ROUND® THERMOSTAT Fig. 8.
Installation Instructions
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... FOR FURTHER ASSISTANCE. CT87J for 4-wire single stage heat pump. M20225 COOL • OFF • HEAT FAN ON WG Y P R B O JUMPER W TO Y AUTO • CT87J SUBBASE HEAT FAN TO SYSTEM POWER COOL REVERSING VALVE HEAT REVERSING VALVE DO NOT ATTACH WIRES TO BOTH B AND O M20186 Fig. 13. CT87A,B,J ROUND® THERMOSTAT Fig. 11. CT87J for a 4-wire single stage...
... FOR FURTHER ASSISTANCE. CT87J for 4-wire single stage heat pump. M20225 COOL • OFF • HEAT FAN ON WG Y P R B O JUMPER W TO Y AUTO • CT87J SUBBASE HEAT FAN TO SYSTEM POWER COOL REVERSING VALVE HEAT REVERSING VALVE DO NOT ATTACH WIRES TO BOTH B AND O M20186 Fig. 13. CT87A,B,J ROUND® THERMOSTAT Fig. 11. CT87J for a 4-wire single stage...
Installation Instructions
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...CT87A,B,J ROUND® THERMOSTAT 7 Mount the thermostat 1. 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. Adjusting heat anticipator indicator...CAPTIVE SCREWS (3) M20227 9 69-0274-6 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....
...CT87A,B,J ROUND® THERMOSTAT 7 Mount the thermostat 1. 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. Adjusting heat anticipator indicator...CAPTIVE SCREWS (3) M20227 9 69-0274-6 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....
Installation Instructions
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... below . SETTING SCALE 69-0274-6 THERMOMETER 10 M9656 Snap on the old thermostat, use the setting for your system IMPORTANT: Setting the heat anticipator allows the thermostat to Heat. 3. The heating system should start. 4. CT87A,B,J ROUND® THERMOSTAT 8 Set the heat anticipator for your CT87 has a subbase, set the system switch to maintain accurate temperature control. 1. NOTE: If the furnace stays...
... below . SETTING SCALE 69-0274-6 THERMOMETER 10 M9656 Snap on the old thermostat, use the setting for your system IMPORTANT: Setting the heat anticipator allows the thermostat to Heat. 3. The heating system should start. 4. CT87A,B,J ROUND® THERMOSTAT 8 Set the heat anticipator for your CT87 has a subbase, set the system switch to maintain accurate temperature control. 1. NOTE: If the furnace stays...
Installation Instructions
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... pointer on the CT87J model. 2. CT87B, J switches Switch System Fan Setting Result Cool Off The thermostat controls your heating system. Both the heating and cooling systems are off. The cooling system should start. 3. The fan runs continuously. IMPORTANT: After heating is below room temperature. The cooling system should stop. CT87A,B,J ROUND® THERMOSTAT Check cooling IMPORTANT: To avoid damaging the compressor...
... pointer on the CT87J model. 2. CT87B, J switches Switch System Fan Setting Result Cool Off The thermostat controls your heating system. Both the heating and cooling systems are off. The cooling system should start. 3. The fan runs continuously. IMPORTANT: After heating is below room temperature. The cooling system should stop. CT87A,B,J ROUND® THERMOSTAT Check cooling IMPORTANT: To avoid damaging the compressor...
