Honeywell CT3550 - Manual (Page 8)

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STEP 4. WIRE WALLPLATE TERMINALS
IMPORTANT
All wiring must comply with local codes and ordinances. If
unsure about household wiring procedures, call your local
heating/air-conditioning contractor.
Refer to the labels you placed on the wires when you removed the
old thermostat (see illustration).
❑ Match the letter of your old thermostat wire with the corresponding
terminal letter on your new thermostat. Refer to Table 2.
❑ Remove the factory-installed jumper connecting terminals R and
RC if wires are connected to both of those terminals.
❑ For wiring diagrams, if needed, see pp 21-22.
❑ Loosen the terminal screws. Slip each wire beneath its matching
terminal. Wraparound and straight connections are both
acceptable, (see illustration). Tighten the terminals.
❑ Plug the hole in the wall with insulation to help prevent drafts from adversely affecting thermostat operation.
M16425
R
W
Y
G
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM). FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM).