Owner's Manual
Page 1
...no 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. Registered Trademark Copyright © 2002 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...
...no 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. Registered Trademark Copyright © 2002 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...
Owner's Manual
Page 2
.... 1). Mercury switch location. Optional if installing directly on . 3. Unscrew and remove the old thermostat wallplate from the wall, but do not disconnect the wires. 69-0274-6 2 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...
.... 1). Mercury switch location. Optional if installing directly on . 3. Unscrew and remove the old thermostat wallplate from the wall, but do not disconnect the wires. 69-0274-6 2 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...
Owner's Manual
Page 3
...-6 M19086 MERCURY NOTICE Fig. 3. Installing wallplate/subbase on the old thermo- Fig. 2. Fig. 4. Identify each wire using the wiring labels that contains mercury in a sealed tube, do not place your M20133 local waste management authority for instructions regarding ...terminal on the wall (wallplate shown). Disconnect the wires from the old thermostat and wrap them from falling back into the wall (Fig. 3). Label the wires using the letter of an old control containing mercury in the trash. Wrapping wires. stat (Fig. 2). CT87A,B,J ROUND® THERMOSTAT 5.
...-6 M19086 MERCURY NOTICE Fig. 3. Installing wallplate/subbase on the old thermo- Fig. 2. Fig. 4. Identify each wire using the wiring labels that contains mercury in a sealed tube, do not place your M20133 local waste management authority for instructions regarding ...terminal on the wall (wallplate shown). Disconnect the wires from the old thermostat and wrap them from falling back into the wall (Fig. 3). Label the wires using the letter of an old control containing mercury in the trash. Wrapping wires. stat (Fig. 2). CT87A,B,J ROUND® THERMOSTAT 5.
Owner's Manual
Page 4
...Position so that the arrow in . Rotate the wallplate/subbase until the wiring openings are on the left and right side of the wallplate or subbase. 4. Installing wallplate/subbase on the cover ring. CT87A,B,J ROUND® THERMOSTAT 1. If using cover ring: Place the wallplate/...subbase over the holes, pull the wires through these holes into the drilled holes. Position the wallplate or subbase. •...
...Position so that the arrow in . Rotate the wallplate/subbase until the wiring openings are on the left and right side of the wallplate or subbase. 4. Installing wallplate/subbase on the cover ring. CT87A,B,J ROUND® THERMOSTAT 1. If using cover ring: Place the wallplate/...subbase over the holes, pull the wires through these holes into the drilled holes. Position the wallplate or subbase. •...
Owner's Manual
Page 5
... level as shown in . Leveling the wallplate. Place the cover ring against the outlet box so that the wiring holes line up . 2. screws, through the wiring hole on the left side of the wallplate/subbase. 5 Level the wallplate or subbase IMPORTANT: The wallplate/subbase...bottom left and right sides of the cover ring. 3. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Loosely attach the wallplate/subbase to maintain accu- CT87A,B,J ROUND® THERMOSTAT 1. To level the subbase, use the leveling posts directly below the Heat and ...
... level as shown in . Leveling the wallplate. Place the cover ring against the outlet box so that the wiring holes line up . 2. screws, through the wiring hole on the left side of the wallplate/subbase. 5 Level the wallplate or subbase IMPORTANT: The wallplate/subbase...bottom left and right sides of the cover ring. 3. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Loosely attach the wallplate/subbase to maintain accu- CT87A,B,J ROUND® THERMOSTAT 1. To level the subbase, use the leveling posts directly below the Heat and ...
Owner's Manual
Page 6
...- STRIP 5/16 in . [11 mm] BARRIER M1279 3. See Fig. 8 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 match each wire beneath its corresponding terminal on the CT87 wallplate or subbase. Fig...
...- STRIP 5/16 in . [11 mm] BARRIER M1279 3. See Fig. 8 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 match each wire beneath its corresponding terminal on the CT87 wallplate or subbase. Fig...
Owner's Manual
Page 7
CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. CT87A for a 4-wire heating/cooling system. CT87B for a 3-wire hot water 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 for a 2-wire 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. CT87A,B,J ROUND® THERMOSTAT Fig. 8.
CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. CT87A for a 4-wire heating/cooling system. CT87B for a 3-wire hot water 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 for a 2-wire 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. CT87A,B,J ROUND® THERMOSTAT Fig. 8.
Owner's Manual
Page 8
...AUTO • POWER WG 1Y P R B O HEAT REVERSING VALVE 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. M20225 COOL •...CT87B for a 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. M20228 69-0274-6 8 CT87J for a 5-wire heating/cooling system. CT87A,B,J ROUND® ...
...AUTO • POWER WG 1Y P R B O HEAT REVERSING VALVE 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. M20225 COOL •...CT87B for a 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. M20228 69-0274-6 8 CT87J for a 5-wire heating/cooling system. CT87A,B,J ROUND® ...