Owner's Manual
Page 1
... 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. No No * CT87A is right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Care at 1-800-468-1502. If you purchased the...
... 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. No No * CT87A is right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Care at 1-800-468-1502. If you purchased the...
Owner's Manual
Page 2
...1. can use a TYPICAL LOCATION OF A standard setting for installation 1. This is locked on. 3. CT87A,B,J ROUND® THERMOSTAT 2 Prepare for your type of MERCURY SWITCH IN A THERMOSTAT system when you reach Step 8 of M20206 this installation. 4. binding head screws, and two 1/4-in...drill with 1/16-in . Save your new thermostat; rough handling may need to hide wall marks. • These Installation Instructions and the Installation Quick Guide. • Wiring labels 2. round head screws • Wallplate (CT87A) or subbase (CT87B, CT87J) • ...
...1. can use a TYPICAL LOCATION OF A standard setting for installation 1. This is locked on. 3. CT87A,B,J ROUND® THERMOSTAT 2 Prepare for your type of MERCURY SWITCH IN A THERMOSTAT system when you reach Step 8 of M20206 this installation. 4. binding head screws, and two 1/4-in...drill with 1/16-in . Save your new thermostat; rough handling may need to hide wall marks. • These Installation Instructions and the Installation Quick Guide. • Wiring labels 2. round head screws • Wallplate (CT87A) or subbase (CT87B, CT87J) • ...
Owner's Manual
Page 3
... old control containing mercury in the trash. COVER RING WALLPLATE NO. 4 X 1 INCH SHEET METAL SCREWS (2) 3 THERMOSTAT WIRING OPENING M20188 69-0274-6 Fig. 2. stat (Fig. 2). Wrapping wires. Installing wallplate/subbase on the wall Refer to keep them from falling back into the wall (Fig. 3). Identify each...a sealed tube. 4 Install the cover ring and wallplate or subbase If installing on the wall (wallplate shown). Fig. 4. CT87A,B,J ROUND® THERMOSTAT 5. Label the wires using the letter of this thermostat is replacing a control that came with the CT87. Do not label the...
... old control containing mercury in the trash. COVER RING WALLPLATE NO. 4 X 1 INCH SHEET METAL SCREWS (2) 3 THERMOSTAT WIRING OPENING M20188 69-0274-6 Fig. 2. stat (Fig. 2). Wrapping wires. Installing wallplate/subbase on the wall Refer to keep them from falling back into the wall (Fig. 3). Identify each...a sealed tube. 4 Install the cover ring and wallplate or subbase If installing on the wall (wallplate shown). Fig. 4. CT87A,B,J ROUND® THERMOSTAT 5. Label the wires using the letter of this thermostat is replacing a control that came with the CT87. Do not label the...
Owner's Manual
Page 4
... ring. Fig. 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. Position the wallplate or subbase. • If using the cover ring: Position the ... the two 1-in . If installing on an outlet box (subbase shown). 1/2 IN. 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 ... wall: Position so that the arrow in the middle of the wallplate or subbase. 4. CT87A,B,J ROUND® THERMOSTAT 1.
... ring. Fig. 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. Position the wallplate or subbase. • If using the cover ring: Position the ... the two 1-in . If installing on an outlet box (subbase shown). 1/2 IN. 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 ... wall: Position so that the arrow in the middle of the wallplate or subbase. 4. CT87A,B,J ROUND® THERMOSTAT 1.
Owner's Manual
Page 5
... subbase over the cover ring so that the wiring holes line up . 2. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Tighten the mounting screws after making sure that the arrow in Fig. 6. CT87A,B,J ROUND® THERMOSTAT 1. Loosely attach the wallplate/subbase to maintain accu... 5 Level the wallplate or subbase IMPORTANT: The wallplate/subbase must be level to the cover ring with two 1/2-in. rate thermostat temperature. 1. To level the subbase, use the leveling posts directly below the Heat and Fan indicators. Place the cover ring ...
... subbase over the cover ring so that the wiring holes line up . 2. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Tighten the mounting screws after making sure that the arrow in Fig. 6. CT87A,B,J ROUND® THERMOSTAT 1. Loosely attach the wallplate/subbase to maintain accu... 5 Level the wallplate or subbase IMPORTANT: The wallplate/subbase must be level to the cover ring with two 1/2-in. rate thermostat temperature. 1. To level the subbase, use the leveling posts directly below the Heat and Fan indicators. Place the cover ring ...
Owner's Manual
Page 6
.... Securely tighten the terminal screws. 5. Fig. 7. FOR STRAIGHT CONNECTION- Loosen the terminal screws and slip each old thermostat wire with its matching terminal. 4. 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...
.... Securely tighten the terminal screws. 5. Fig. 7. FOR STRAIGHT CONNECTION- Loosen the terminal screws and slip each old thermostat wire with its matching terminal. 4. 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...
Owner's Manual
Page 7
CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. CT87A 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 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 4-wire heating/cooling system. CT87A,B,J ROUND® THERMOSTAT Fig. 8.
CT87A WALLPLATE R Y W POWER HEAT TO SYSTEM M20183 Fig. 9. CT87A 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 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 4-wire heating/cooling system. CT87A,B,J ROUND® THERMOSTAT Fig. 8.
Owner's Manual
Page 8
... POWER FAN TO SYSTEM COOLING POWER TO SYSTEM COOL HEAT Fig. 12. M20228 69-0274-6 8 CT87B for 4-wire single stage heat pump. CT87J for a 5-wire heating/cooling system. CT87J for a 4-wire single stage heat pump. CT87A,B,J ROUND® THERMOSTAT Fig. 11. M20225 COOL • OFF • HEAT FAN ON WG Y P R B O JUMPER W TO Y AUTO • CT87J...
... POWER FAN TO SYSTEM COOLING POWER TO SYSTEM COOL HEAT Fig. 12. M20228 69-0274-6 8 CT87B for 4-wire single stage heat pump. CT87J for a 5-wire heating/cooling system. CT87J for a 4-wire single stage heat pump. CT87A,B,J ROUND® THERMOSTAT Fig. 11. M20225 COOL • OFF • HEAT FAN ON WG Y P R B O JUMPER W TO Y AUTO • CT87J...
