Honeywell CT3451 Owner's Manual - Page 3
Mount Wallplate, Wire Wallplate Terminals - programmable thermostat
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3 MOUNT WALLPLATE IMPORTANT Level for appearance only. The thermostat functions normally even when not mounted level. ❑ Position the wallplate on the wall. Level the wallplate for appearance, if desired. Use a pencil to mark the two mounting holes that best fit the application. See Fig. 3. WALL 1 WALL ANCHORS (2) CT3451 PROGRAMMABLE THERMOSTAT TERMINAL SCREW FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM) FOR WRAPAROUND STRIP 7/16 IN. (11 MM) G Rc R W B Y O M12559A MOUNTING SCREWS (2) WALLPLATE 1 WHEN USING WALL ANCHORS, DRILL 3/16 INCH HOLES FOR DRYWALL, 7/32 INCH HOLES FOR PLASTER OR WOOD. M12202A Fig. 3. Mounting wallplate to wall. ❑ Remove the wallplate from the wall and drill two 3/16in. holes in the wall (if drywall). For firmer wall material such as plaster or wood, drill 7/32-in. holes. Gently tap provided anchors into the drilled holes until flush with the wall. ❑ Reposition the wallplate, pulling wires through the wiring opening. Loosely insert the mounting screws into the holes. ❑ Level for appearance only; the thermostat functions correctly even when not level. Tighten the mounting screws. 4 WIRE WALLPLATE TERMINALS All wiring must comply with local electrical codes and ordinances. If unsure about household wiring procedures, call your local heating and air conditioning contractor. Refer to the labels you placed on wires when you removed your old thermostat. ❑ Match the letter of your old thermostat wire with the terminal of the corresponding letter on your new thermostat. Refer to Fig. 4. Fig. 4. Connecting wiring. NOTE: To ensure correct mounting of thermostat, restrict all wiring to the shaded area in the center of the terminals. ❑ Loosen the terminal screws and slip each wire beneath its matching terminal. The shape of the terminals permit insertion of straight or wraparound connections. See Fig. 5. Tighten the terminals. FOR WRAPAROUND, STRIP 7/16 IN. (11 mm) FOR STRAIGHT INSERTION, STRIP 5/16 IN. (8 mm) M12537 Fig. 5. CT3451 methods for wiring connection. ❑ Plug the hole in the wall with insulation to help prevent drafts from adversely affecting thermostat operation. The CT3451 Thermostat is powered with 3AA alkaline batteries and is adaptable to most 18 to 30 Vac heatingcooling systems. Refer to Fig. 6 through 10 for typical system wiring diagrams. 3 69-1620-1