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■ Each wire coming from the wall to the existing thermostat is connected to a terminal point on
that thermostat. Each of these terminal points is usually marked with a code letter as shown in
Table A on page 11.
■ The number of wires in your system can be as few as two (for heat only systems), as many as
eight, or any number in between. If you follow the labeling procedures correctly, you do not
have to be concerned about how many wires there are.
■ There is often no terminal marking on the existing thermostat of two wire, heat only systems.
Do not worry, just connect either of the wires to the RH terminal, then connect the other wire to
the W terminal to complete the circuit.
■ IMPORTANT! BEFORE DISCONNECTING
ANY WIRES, APPLY THE SELF-ADHESIVE
LABELS PROVIDED TO THE WIRE AS SHOWN IN TABLE A ON PAGE 11. (For example,
attach the label marked W to the wire which goes to the W or H terminal on your existing
thermostat.) IGNORE
THE COLOR OF
THE WIRES since
these do not always comply with the standard.
■ After labeling wires, disconnect them from the existing
thermostat terminals.
■ Remove existing wallplate. To make sure wires do not fall back
into wall opening, you may want to tape them to the wall.
■ If hole in wall is larger than necessary for wires, seal this hole
so that no hot or cold air can enter the back of the thermostat
from the wall. This air could cause a false thermostat reading.
10-11
Installation