Honeywell T834N Owner's Manual - Page 3

English: Page 1 • Français: Page 6 • Español: Página 11 Base installation 1 Pull wires through wire hole. Position base on wall, level and mark hole positions. 2 Drill holes (3/16" for drywall, 7/32" for plaster), then tap in supplied wall anchors. 3 Pull wire through base, position over anchors, then insert and tighten mounting screws. Check level if desired. Wiring 1 Loosen screw terminals, insert bare wires beneath screws, then re-tighten screws. 2 Push excess wire back into the wall opening. 3 Plug the wall opening with nonflammable insulation to prevent drafts from affecting thermostat operation. Terminal Designations R Heating power. Connect to secondary side of heating system transformer. Rc Cooling power. Connect to secondary side of cooling system transformer. ** G Fan relay. W Heat relay. ** B Heat pump changeover valve energized in heating. ** O Heat pump changeover valve energized in cooling. Y Compressor contactor. ** Not present in T834L model NOTES R & Rc terminals In single-transformer system, leave metal jumper in place between R & Rc. Remove metal jumper if two-transformer system. Heat pump systems If wiring to a heat pump, use a small piece of wire (not supplied) to connect terminals W and Y. Wire specifications Use 18-gauge thermostat wire. Shielded cable is not required. 3