Honeywell T87N Owner's Manual - Page 3

English: Page 1 • Français: Page 6 • Español: Página 11 Subbase and base installation 1. Pull wires through wire hole. Position coverplate on wall, level and mark hole positions. 2. Drill holes (3/16" for drywall, 7/32" for plaster) and tap in supplied wall anchors. 3. Pull wire through coverplate and subbase, position over anchors, then insert and tighten mounting screws. Check level if desired. 4. Apply the large-print labels to the coverplate, matching the labels on the subbase. Coverplate Large-print subbase switch labels Subbase Wiring 1. Loosen screw terminals, insert wires into terminal block, 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 W Heat relay. Y Compressor contactor. G Fan relay. O Heat pump changeover valve energized in cooling. Rc Cooling power. Connect to secondary side of cooling system transformer. R Heating power. Connect to secondary side of heating system transformer. B Heat pump changeover valve energized in heating. E F G R W Rc Y O B 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- to 22-gauge thermostat wire. Shielded cable is not required. 3 69-1840EFS-03