Operation Manual

Cleaning and Maintenance - Level I Descaling

WARNING: Descaling requires the pumping of a strong chemical solution through the machine.

These special chemicals usually contain an acid which can be hazardous. Carefully follow the

manufacturer’s safety precautions and recommendations for proper use. Even when working care

fully, some of this chemical may splash. Gloves and eye protection are required when handling

and using these chemicals. Do not allow spectators in the area when working. Do not touch your

face or eyes during this as the descaler can cause serious irritation and burns to sensitive tissues.

Immediately consult a physician or call emergency services if this occurs.

CAUTION: The acidic solution can splash when de-scaling. Protect the working surface as well as

the machine itself and immediately wash off any that splashes or spills.

This procedure is a simple descaling of the Double Domobar espresso machine which does not re-

quire access to internal components. This procedure does not replace the need for a “Level II” descal-

ing. Level I descaling does not reach all levels of the steam boiler where scale may be forming. We offer

these instructions as an informational resource only. If you decide to follow these instructions you do so

at your own risk. Contact your reseller for details concerning Level II descaling.

Descaling of an espresso machine helps rid various internal areas of hard water deposits. Depending on

the mineral content of your water and how often you use your DD, you should descale the Double Domobar’s

boilers at least once every six months. In extreme cases where water is very high in scaling minerals, it might

be necessary to descale once a month.

As water is repeatedly heated and some of it boils off as steam, some of the mineral content in the water

is left behind. These minerals can form hard water deposits which can cause problems such as:

• failure of the water-level sensor to function properly

• heating element failure

• clogging of the thermosyphon pipes

• low volume of brewing water

• poor pressurestat response

• low-temperature brewgroup

• drips and leaks from the brewgroup

De-scaling is a preventative maintenance chore that can help avoid these problems and will signiﬁcantly

prolong the life of your Double Domobar.

CAUTION: Only use products which explicitly state that they are intended for the removal of min-

eral deposits in the boilers of espresso machines. Some other products, such as those made for

cleaning coffee pots or removing hard water scale from bathrooms must never be used! No other

chemicals should ever be added to the water in the reservoir or run through the DD’s boilers. Al-

ways follow the product manufacturer’s recommendations, instructions, and warnings when de-

scaling an espresso machine. Use of improper cleaners in the boiler can void the warranty, damage

numerous parts of the espresso machine, and may create a health hazard or dangerous situation.

A - Descaling the Brew Boiler

NOTE: Both of the following procedures “A - Descaling the Brew Boiler” and “B - Descaling the

Steam Boiler,” should be followed each time the machine is descaled.

1 Turn the power switch to “Position 0.”