Tetra Pak Hoyer Frigus 600, Руководство пользователя

Страница: 41 / 112

7-39
Tetra Pak
Hoyer
B F60 03 G 04
CAUTION:
All repairs and inspections of the refrigerating
plant must be performed exclusively by a
qualified refrigerator technician.
Condensation
Coolant exiting the refrigerator compressor is
condensed in the plate condenser by water, which
may come from the water supply (or a well, or a
circuit with a cooling tower). The Frigus 600 has
condensers with pressure valves which are factory
set and keep condensation pressure at the optimal
value (3-4 bar). If water from a cooling tower is
used, it should be kept at the same temperature at
all seasons, if possible (with a fan in the tower
controlled by a thermostat) so as to keep the
performance of the refrigerating plant uniform.
The condenser must be kept clean to ensure
correct, efficient operation of the machine. All
heat taken out of the ice cream mix and all energy
consumed by the compressor to transfer this heat
are transferred out of the system (in the cooling
water) through the condenser. If the condenser
is dirty, it will be difficult to get rid of the heat,
and the freezer may not cool down sufficiently
and may consume excess energy.
Decreased efficiency of the condenser is
normally due to the combined action of particles
of dirt in the flow of water and substances which
have separated from the water (present even in
very clean water).
Dirt particles, if large, will obstruct the passage
7.1.3 Maintenance of the refrigerating plant
The electrical system is conceived, designed and
developed to provide maximum protection for
the continuous freezer components.
When a motor shuts down due to overload, the
alarm page on the touch-screen signals an alarm
message due to a tripped thermal.
If the thermal is tripped again when it is reset,
the problem or short circuit persists and it will
be necessary to inspect the electrical system and
possibly block mechanical components.
If the motor compressor on the refrigerating plant
7.1.2 Maintenance of the electrical system
shuts down, check the pressure switch and
electronic protection (located in the terminal
board above the motor compressor). This must
be done before working on the electrical system.
Pay careful attention to the wiring diagram.
The numbered terminal board appearing in the
diagram mirrors the board installed on the freezer
to make it easy to control it. Maintenance and
repair operations should be performed by a
qualified electrician.
of water; substances which separate from water
and deposit on the exchange surfaces will
obstruct the passage of heat.
Preventing soiling of the condenser
Prevent problems caused by dirt by keeping dirt
out of the condenser. If cooling water comes from
a circuit in which it is impossible to prevent entry
of foreign particles (such as leaves, blades of
grass or tiny insects in water from a tower or
sand in well water), it will be necessary to decant
and separate out these particles.
As specific protection for the freezer, one or more
filters may be installed at the water intake to stop
all particles over 1 mm (largest dimension). The
size and type of filter must be determined
according to the amount and type of dirt in the
water.
To prevent efficiency from being decreased by
substances separating out of the water, first
analyse the water to determine what treatment
would be best. All waters tend to corrode or sca-
le the surfaces with which they come into
contact; it is very difficult to achieve and
maintain a balanced condition in which there is
neither corrosion nor scaling.