Dometic RM760 Manuale Utente Scaricare il pdf (Pagina 2)

Rust: the Enemy

Although many owners assume a cooling unit failure is caused by “blockage,” about 25 years ago manufacturers changed the

boiler design to greatly reduce the tendency for the boilers to block. Until that redesign, the most common problem was a

blockage caused by the anticorrosion salt additive in the refrigerant plating out on the inside of the boiler tubes. Today, the pres-

ence of a blockage is unusual.

By far the most common reason for cooling unit failure is the rusting of the tubes within the foam block. These tubes are

encased in foam because they are cold and must be insulated from the warm air outside the refrigerator. Because these tubes are

cold, they attract moisture that condenses on the outside of the tubes, causing them to rust through. Once there is a small leak,

you might smell the ammonia that is characteristic of a failed unit. Sometimes these leaks are very small and are positioned so

they off-gas the ammonia very slowly out the back of the unit, and you’ll smell nothing.

Galvanizing: the Answer

ATCO cooling units are galvanized to protect against rusting in the foam block. Galvanizing involves bonding pure zinc to the

tubes encased in the foam block, a process that produces a protective coating with superior rust-resistant properties—and a pro-

cess that only ATCO America Galvanized offers.

The advantage of a galvanized coating on the steel tubes within the foam block is based on the properties of the zinc itself.

Zinc has a sacriﬁ cial nature, meaning it will be attacked by moisture ﬁ rst and give itself in protection of the steel. This is called

cathodic protection, and it is the primary reason zinc is the best coating available.

ATCO America RV refrigerator cooling unit instructions —provided as a service to our dealers

based on our years of experience supporting RV service technicians.

www.atcoamerica.com

How it Works

Page 2

How a Cooling Unit Works

ATCO

GALVANIZED

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Dometic RM760 Manuale Utente Pagina 2