Duke WB303-NAT Manuel d'entretien - Page 5

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MAINTENANCE

Stainless Steel Care and Cleaning

Stainless steel contains 70-80% iron, which will rust.

It also contains 12-30% chromium, which forms an

invisible passive film over the steel surface and acts

as a shield against corrosion. As long as the protective

film remains intact, the metal will not corrode.

However, if the film is broken or contaminated,

outside elements can begin to breakdown the steel

and begin to form rust or discoloration. To prevent

rust and discoloration on stainless steel, several

important steps need to be taken.

CAUTION: Never use steel wool pads or wire

brushes or scrapers.

Avoid cleaning solutions that

contain alkaline or chloride.

Use alkaline based or non-chloride cleaning

solutions. Anything containing chloride will damage

the protective film on stainless steel. Chlorides

are found in household and industrial cleaners

and also in hard water and salts. If a chloride or

alkaline cleaner has been used, rinse repeatedly

and dry thoroughly.

Always use only soft cloths or plastic scouring pads.

For routine cleaning, use warm soapy water. For

stubborn stains use a non-abrasive cleanser. For

heavy grease use a degreaser. For best results,

rub with the grain of the steel.

Pitting and cracking are early signs of stainless

steel breakdown. But special stainless steel

cleaners can restore and preserve the protective

film. If signs of breakdown appear, thoroughly clean

and dry all surfaces. Begin regular application of

a high quality stainless steel cleaner according to

the manufacturer's instructions. Again, always rub

with the grain of the steel for best results.

CAUTION: Never use an acid-based

cleanser! Be sure to clean

all food products from any

stainless surface. Many food

products contain acid, which can

deteriorate the finish. Common

foods include tomatoes, peppers

and other vegetables.

Gas Operated Foodwarmers

WARNING

THE GAS SUPPLY MUST BE TURNED

OFF AND DISCONNECTED AT ALL

TIMES DURING MAINTENANCE OR

REPAIR FUNCTIONS.

Gas Regulators

Figure 2.

Typical Gas Regulator

A regulator (see Figure 2) is a device for maintaining

a constant safe, operating pressure between a gas

source and a gas appliance. A regulator works

independently of supply pressure and flow.

Installation, service and repair of gas regulators

must be performed by qualified, certified

maintenance personnel.

The Vent Limiting Device is standard on the

regulators. The vent limiter limits gas levels to

within the ANSI safe standard level in the event

of a gas leak. It is absolutely necessary to provide

and maintain free airflow around the vent limiter.