4 Crathco®Model 3312 Beverage Freezer
General Information
Freezer Application and Specifications
Model 3312
The freezer consists of two freezing cylinders with
rotating internal augers (dashers) that are belt-driven
by electric motors. The augers scrape frozen product off
of the inside of the refrigerated cylinders. Torque
sensing mechanisms control compressor operation to
maintain desired product consistency. The freezer
utilizes an air-cooled refrigeration system to freeze the
product. Self-closing dispensing valves are attached to
the front of the freezing cylinder. The unit has an
adjustable consistency control and an out of product
indicator for each side.
When properly operated and cared for, the Model 3312
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 3312 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 W0480438 has one horizontal outlet slot
and is used to serve thin to medium products such as
frozen lemonade and slush. The other plunger, part
W0480451 has two horizontal outlet slots and is used
to serve thicker product such as neutral base frozen
cocktails. A red spring, part W0631239, is used on the
drive motor to adjust product consistency to serve thin
to medium products. The yellow spring, part W0631238,
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 running 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.
