9
OPERATING AND MAINTENANCE MANUAL
Chapter 4 - Description
TAE K15÷K20
The data in this manual are not binding and may be changed by the manufacturer without notice.
Reproduction of this manual, even partial, is strictly prohibited.
C
HAPTER
4
D
ESCRIPTION
4 . 1
C o m p o n e n t s
The data relating to the materials refer to standard machines. In case of particular units special materials are used, so it is necessary to refer to the
data on the offer.
The machines essentially consist of the following components:
•
Refrigeration compressor
•
Condenser
•
Evaporator
•
Tank
•
Pump
•
Frame/outer panelling
•
Electronic controller
4 . 2
C o o l i n g c i r c u i t
Models TAE K15÷K20 have a single refrigerant circuit with one compressor.
The circuits consist of the following components:
•
refrigerant fluid used R134a;
•
piston hermetic compressor;
•
pressure switches for high and low refrigerant pressure;
•
thermostatic throttle valve with external equalization (in models without prismatic tank);
•
dryer filter;
•
liquid flow sight glass;
•
Schrader service valves;
Consult the enclosed drawings for additional information.
4 . 3
C o m p r e s s o r s
All the machines are equipped with piston hermetic compressors, which are distinguished for their high energy efficiency, low vibrations and
consequent silence in normal operation.
They are cooled by the aspirated gas, protected against overheating of the windings by an internal module that monitors their temperature and,
upstream, by magnetothermic circuit breakers. These components are housed in a closed, but easily accessible, compartment.
4 . 4
C o n d e n s e r
Condensation occurs through fin-pack coils consisting of copper tubes and collectors, aluminium fins and shoulders in galvanised sheet.
4 . 5
E v a p o r a t o r
The evaporator is a finned pack type; the water flows in contact with the finned surface and at a speed that guarantees low pressure drops, while
the refrigerant fluid flows inside the tubes.
A plate exchanger can be fitted as an alternative.
In the TAE K15÷K20 models, the exchanger is protected against the formation of ice, caused by low evaporation temperatures, through an anti-
freeze function in the electronic controller. A probe monitors the temperature of the evaporator outlet water. If it is necessary to achieve a
negative ambient/water temperatures, a mixture of water and glycol must be used.
4 . 6
T a n k
The storage tank is a prismatic atmospheric.
The tank can be protected against freezing by means of an electric heater managed by the electronic controller. A level sensor in the tank serves
to signal low water level conditions. The standard supply includes anti-condensation cladding, a drain valve and an air bleed valve. An internal
bypass between the water delivery and return connections, makes it possible to read the anti-freeze probe if the unit's process water inlet and
outlet connections are inadvertently closed. In this case the unit stops due to tripping of the antifreeze alarm and the shut-off valves must be
reopened.
The bypass serves exclusively to allow an antifreeze alarm to trip (if present) and to allow the pump to run with a reduced water flow rate
without damage. It is advisable to avoid repeated antifreeze alarm trip cycles in the foregoing conditions.
With the prismatic atmospheric tank process water
filling is performed utilising a kit comprising a semi-
transparent plastic container. In steady-state
operating conditions the liquid level must be about
half way up the container.
Содержание TAE K15
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