Honeywell RTH3100C Owner's Manual - Page 8

Identify wires you will - installation

Page 8 highlights

Installation Guide Identify wires you will not use If any wires are not attached to terminals in your old thermostat, do not connect them to your new thermostat. Wrap the bare metal ends of each unused wire with electrical tape, so it cannot touch and short out other wires. Do not use unconnected wires. 

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Installation Guide
ยด
Do not use
unconnected
wires.
If any wires are not attached to terminals in your old thermostat, do not connect them
to your new thermostat.
Wrap the bare metal ends of each unused wire with electrical tape, so it cannot touch
and short out other wires.
Identify wires you will
not
use