Precor 100i - Manual (Page 22)

Product Owner's Manual: Maintenance 20
Storing the Chest Strap
If you purchased the optional heart rate chest strap, store it in a
place where it remains free of dust and dirt (for example, in a closet
or drawer). Be sure to protect the chest strap from extremes in
temperature. Do not store it in a place that may be exposed to
temperatures below 32° F (0° C).
To clean the chest strap, use a sponge or soft cloth dampened in
mild soap and water. Dry the surface thoroughly with a clean towel.
Long-Term Storage
When the equipment is not in use for any length of time, make sure
it is turned Off (treadmill only) and the power cord or optional
power adapter (self-powered equipment) is unplugged from its
power source and is positioned so that it will not become damaged
or interfere with people or other equipment.