DoorBird D21 Série Manuel D'installation page 24

MAINTENANCE FOR DOORBIRD PRODUCTS
Cleaning and maintenance instructions
All DoorBird door stations are made of high-quality materials and are designed
for a durable lifetime. Since door stations are usually installed in unprotected
outdoor areas, they are exposed to adverse weather conditions and aggressive
substances, especially close to frequently used roads, in coastal and industrial
areas. Therefore please consider the following care instructions. Unfortunately,
we cannot accept any liability for damage if these instructions are not being
observed.
Aggressive dirt such as bird droppings should be removed as quickly as
possible.
Never use abrasive detergents such as steel wool or scouring milk!
N OT ICE
Warm water is usually sufficient, if necessary with a little detergent, a soft
cloth or brush. Plastic parts (camera or name tags) must not be treated with
metal care products. Remove all residues of cleaning agents or lubricants to
avoid stains or discolouration after the maintenance.
Stainless Steel
Only high-quality German stainless steel is used for all available DoorBird door
stations. However, high-quality stainless steel can also rust, as approx. 70 % of
stainless steel is made of iron. Rust resistance is only achieved by a protective
layer (also called passive layer), which covers the iron like a skin. This protective
layer consists essentially of chromium and other precious metals.
Iron particles, grinding dust and chips deposited on stainless steel can lead
to corrosion (rust film). These iron particles can be found everywhere, but
especially in coastal and industrial areas and close to frequently used roads.
Please remove ferrous deposits immediately, as they will attack your door
station and lead to real rust if not removed. To remove rust, simply wipe off the
dust; in addition, a care product is recommended, e.g. WD 40, available e.g. at
Amazon for less than € 5.00. Simply apply in a thin layer and rub in. The same
applies if rust appears on the engravings on the stainless steel surface.
Cement or lime splashes should be carefully removed as soon as possible
with a wooden spatula before hardening.
The following cleaning detergents are not to be used as they reduce corrosion
resistance:
• products containing chloride and hydrochloric acid
• Bleach (in case of accidental use, rinse thoroughly with water)
• Silver polish
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