Tetra Pak Hoyer Frigus 400, Manual

Page: 34 / 97

7-2
Tetra Pak
Hoyer
F40 03 GB 00
7.1 Washing
Washing of a machine used to process foodstuffs
normally involves the following operations:
-
Prewash with hot water to remove most of the
dirt.
- Basic wash to remove grease residues.
- Acidic wash to remove limestone deposits
- Disinfecting to remove bacteria.
- Rinse with cold water.
Limestone deposit formation is reduced
considerably at the low temperatures of freezers;
this means that it is not necessary to carry out an
acidic wash every day, provided that the conditions
of operation and the hardness of the water used
permit. It may be sufficient to carry out an acidic
wash only once a week.
In any case, the effectiveness of the washing
procedure must be tested by experimentation and
adapted to suit the machine’s specific conditions
of use.
When selecting a detergent solution, it is important
to consider ease of use and safety of use for
operators and for the materials out of which the
machine is made. In order to assist users in the
choice, a number of examples of suitable products
(which are equivalent to one another) made by
well-known manufacturers distributed all over
the world are listed below. It is very important to
comply with the precise concentrations specified.
WARNING:
The instructions given below represent general
guidelines for washing. It may be necessary to
adapt the procedure to the specific conditions
of operation, and the actual effectiveness of the
method must be systematically verified
periodically using appropriate instruments.
Tetra Pak Hoyer shall not accept liability for
damage resulting from inadequate sanitation
of the machine.
7.1.1 CIP washing.
CIP (Cleaning In Place) washing permits cleaning
of the internal parts of the machine which come into
contact with the product with no need to dismantle
the machine.
If you have no centralised washing system, you will
at least need a container and a pump, as shown in
the illustration:
1. 1. Prepare washing solution at the correct tem-
perature for the stage in the washing cycle to
be performed (refer to table of wash stages
and conditions) in an appropriate recipient. Fig.
7.1 illustrates the Hoyer wash tank (1) with
built-in pump (2).
2. Start the CIP wash cycle using the switch (refer
to the end of production instructions in section
6.4 of this manual).
In this condition the pump by-pass valve and
the ice cream output valve are open at all times
to maximise flow of cleaning solutions, while
the dasher pump works intermittently. The
dasher and pump work for 5 seconds per mi-
nute throughout the duration of the wash cycle,
so that they can be washed without causing
excessive wear or severe damage to
mechanical parts due to lack of lubrication.
3. Start up the wash tank pump. The wash cycle
will be carried out as follows:
a - a - Prewash with hot water.
b - Detergent wash. Use an alkaline detergent
which is non-caustic and does not form foam
(containing a mixture of alkaline, sequestering,
anti-corrosive and surfactant agents) with a pH
of approximately 11 at a concentration of 1%.
Use a concentration of 1.2% to 1.6%,
depending on how dirty the machine is and how
hard the water supply is.
c - Rinse with cold water.
d - Descaling wash. Use buffered phosphoric acid
in a concentration of 0.5% to 1%.
e - Rinse with cold water.
f -
Disinfectant wash. Use a moderately alkaline
active disinfectant in a concentration of 1% to
1.2%.
g - Rinse with cold water.