69-1849 - PRO 4110D Programmable Thermostat - Honeywell

Installation GuideWiringCAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.Disconnect power before wiring.Keep wires in thisshaded areaJumperWiring1 Loosen screw terminals, insertwires into terminal block, then retightenscrews.2 Push excess wire back into thewall opening. Keep wires in shadedarea as shown at left.3 Plug the wall opening with nonflammableinsulation to preventdrafts from affecting thermostatoperation.TerminalblockNOTESR & Rc terminalsIn single-transformer system, leave metaljumper in place between R & Rc. Removemetal jumper if two-transformer system.Heat pump systemsIf wiring to a heat pump, use a small piece ofwire (not supplied) to connect terminals Wand Y.C terminalThe C (common wire) terminal is optionalwhen thermostat is powered by batteries.Wire specificationsUse 18- to 22-gauge thermostat wire.Shielded cable is not required.Terminal DesignationsW Heat relay.YGCompressor contactor.Fan relay.O Heat pump changeover valve energizedin cooling.Rc Cooling power. Connect tosecondary side of coolingsystem transformer.RBCHeating power. Connect tosecondary side of heatingsystem transformer.Heat pump changeover valve energizedin heating.Common wire from secondary sideof cooling system transformer.4