User manual HONEYWELL CT87J

[. . . ] drill bit · Wire cutter/stripper or sharp knife · Pencil 3 Remove the old thermostat 1. Turn off power to the heating/cooling system at the main fuse/circuit breaker panel. Locate the heat anticipator adjustment scale and lever on the old thermostat (Fig. MERCURY SWITCH Current setting: OLD THERMOSTAT ANTICIPATOR SCALE LEVER TYPICAL LOCATION OF A MERCURY SWITCH IN A THERMOSTAT M20206 If you cannot find the heat anticipator setting on the old thermostat, you can use a standard setting for your type of system when you reach Step 8 of this installation. 4. [. . . ] BINDING HEAD SCREW (2) OUTLET BOX 1 2 COVER RING SUBBASE 1/4 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 POSITION SHOWN, BUT FASTEN WITH SCREWS THROUGH "A". M20187 69-0274-6 4 CT87A, B, J ROUND® THERMOSTAT 1. Place the cover ring against the outlet box so that the arrow in the middle of the cover ring is pointing up. Pull the wires through the wiring hole on the bottom left side of the cover ring. Align the screw slots on the cover ring with the outlet box screw holes, and attach the cover ring to the outlet box with two 1/2-in. Place the wallplate or subbase over the cover ring so that the wiring holes line up, and pull the wires through. Loosely attach the wallplate/subbase to the cover ring with two 1/4in. screws, through the screw holes on the left and right sides of the wallplate/subbase. 5 Level the wallplate or subbase IMPORTANT: The wallplate/subbase must be level to maintain accurate thermostat temperature. To level the subbase, use the leveling posts directly below the Heat and Fan indicators. Fig. Leveling the wallplate. SPIRIT LEVEL LEVELING POSTS (2) OPENING FOR THERMOSTAT WIRING MOUNTING SLOTS M3319A 2. Tighten the mounting screws after making sure that the wallplate or subbase is level. 5 69-0274-6 CT87A, B, J ROUND® THERMOSTAT 6 Wire the thermostat 1. Use the wiring cross-reference table below to match each old thermostat wire with its corresponding terminal on the CT87 wallplate or subbase. 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. 9 W Y Connect to CT87A R Connect to CT87B RH Rc W Y G W Y G B* O* P Connect to CT87J R *Never attach wires to both the B and O terminals. Strip the wire insulation as needed to fit the wires underneath the terminal screws (Fig. Fitting wires under the terminal screws. FOR STRAIGHT CONNECTION-- STRIP 5/16 in. Loosen the terminal screws and slip each wire beneath its matching terminal. Push any excess wire back into the wall. 69-0274-6 6 CT87A, B, J ROUND® THERMOSTAT Fig. CT87A for a 2-wire heating only system. CT87A WALLPLATE POWER R Y W HEAT M20183 TO SYSTEM Fig. CT87A for a 3-wire hot water heating only system. CT87A WALLPLATE WIRE LABELS (LETTERS ON ORIGINAL THERMOSTAT TERMINALS) R R W Y W B M20184 3-WIRE HOT WATER ZONE VALVE Fig. CT87B for a 4-wire heating/cooling system. CT87B SUBBASE OF F· A HE T FA NO N POWER AU · COO L· FAN COOL TO SYSTEM TO RH G RC Y W HEAT JUMPER RH TO RC M20185 7 69-0274-6 CT87A, B, J ROUND® THERMOSTAT Fig. [. . . ] Heat anticipator setting: 1. 2 0. 8 0. 8 0. 4 0. 3 9 Check heating/cooling operation Check heating 1. Turn the dial until the temperature on the setting scale is below the room temperature that is shown on the thermometer. Checking heating system. SETTING SCALE THERMOMETER M9656 69-0274-6 10 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 outdoor temperature is below 50°F (10°C). If your CT87 has a subbase, set the System switch on the left to Cool. [. . . ]