4
Crathco
®
Model 3311 Beverage Freezer
General Information
Freezer Application and Specifications
Model 3311
The freezer consists of a freezing cylinder with a
rotating internal auger (dasher) that is belt-driven by
an electric motor. The auger scrapes frozen product off
of the inside of the refrigerated cylinder. A torque
sensing mechanism controls compressor operation to
maintain desired product consistency. The freezer
utilizes either an air-cooled or water-cooled
refrigeration system to freeze the product. A self-
closing dispensing valve is attached to the front of the
freezing cylinder. The unit has an adjustable consistency
control and an out of product indicator.
When properly operated and cared for, the Model 3311
will provide many years of service. Proper care includes
regular cleaning and maintenance. To minimize the
amount of maintenance necessary, follow the operating
procedures outlined in this manual.
Product Tips
The Model 3311 was designed to dispense a wide
variety of frozen beverages including frozen fruit juice,
frozen lemonade, slush and frozen cocktails. These
products can be served in consistencies ranging from
thin to fairly thick.
Two types of dispensing valve plungers and product
consistency springs are available depending on the
thickness of the product being served. These parts are
interchangeable depending upon your needs. One
plunger, part
has one horizontal outlet slot
and is used to serve thin to medium products such as
frozen lemonade and slush. The other plunger, part
has two horizontal outlet slots and is used
to serve thicker product such as neutral base frozen
cocktails. A red spring, part
, is used on the
drive motor to adjust product consistency to serve thin
to medium products. The yellow spring, part
,
is used for thicker product. The spring is located next to
the drive motor behind the right hand side panel.
Over an extended period of time, some products, such
as frozen cocktails that contain alcohol, have a
tendency to separate, or stratify. Separation of product
on the mix storage hopper can result in frozen product
quality inconsistency. Simply keeping the product, in the
mix storage hopper, stirred on a regular basis will
eliminate this problem.
Some cappuccino or latté mixes contain dairy products
which can spoil if not refrigerated. If the freezer is to
be turned off at night, these products must be removed
from the freezer.
Contact your local health department regarding its
regulations for proper mix handling and storage.
Carburetor Assembly
Your new freezer uses a metering device, known as a
carburetor, to feed the proper ratio of mix and air into
the freezing cylinder (and to prevent frozen product
from rinsing out of the freezing cylinder).
The carburetor, or carb tube, is a tube with a hole, or
series of holes, bored through the side. It is located in
the hopper and fits in the hole that leads to the
freezing cylinder. Air flows into the freezing cylinder
through the top of the tube and mix flows in through
a smaller hole in the side of the carb tube. The size of
the mix inlet hole can be balanced with the viscosity
(thickness) of the liquid mix and product draw rate, in
such a way that the proper amount of mix is fed into
the freezer cylinder to blend with air at just the right
ratio. Mix viscosity varies by mix type, mix temperature
and mix age. Different serving rates also demand
different feed rates. For many products, the proper mix
to air ratio is generally accepted to be two parts mix to
one part air. This proportion yields a finished product
that is both tasty and profitable. At this ratio, one
gallon of liquid mix will yield a volume of one and one-
half gallons of frozen product. This additional volume
is the overrun in the product. Crathco offers two
versions of carb tubes (see Figure A). Depending on the
product being served and overrun requirements there
is a standard tube for most slush or cocktail products
and a low overrun carb tube that allows all air trapped
in the freezing cylinder to escape. Most applications
only require the standard carb tube.
Figure A
2
1
2
2
1
Standard
carb tube
(
Low overrun
carb tube
(
