Pub. 42004-438M
300 Series Emergency Telephone Manual
Page 46 of 50
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-438M.docx
04/19
Preventive Maintenance for Model 392-001, 392-001FS, 396-00X, 396-
001FS, 397-00x, 397-001FS, and 398-00x Telephones
Stainless steel does not normally require maintenance to prevent corrosion from occurring. Different
installation locations may require more regular maintenance than others, depending on the environment
and exposure to airborne contaminants. The following maintenance steps should be performed on a
regular basis or when corrosion is first noticed on your telephone.
Cleaning
•
For general cleaning, wipe the surface with a cleanser or a cleanser and water mixture. Any cleanser
that is safe for glass is usually safe for stainless steel. Wipe dry.
•
If corrosion or rusting is noticed, remove with a non-abrasive commercial cleanser and water. Rub
stained areas in the same direction as the existing grain. Stubborn stains may be removed with a
magnesium oxide, ammonia, and water paste. Wipe clean, rinse with water, and dry.
Corrosion Prevention
Automotive wax provides the best results in preventing corrosion on stainless steel. Simply apply wax,
let dry to a haze, and buff to a shine with a clean dry cloth. This application should protect the telephone
surface for many months as it will allow natural reformation of the chromium oxide layer.
Do NOT use steel wool, sandpaper, mineral acids, bleaches, or chlorine cleansers on the stainless
surface.
