EVCO EK825AP7 - Manual

1
GENERAL CHARACTERISTICS
* Frontal size: 72 x 144 mm (2.83 x 5.66 ").
* Power supply: 230 Vca.
* Six easy selectable cycles of functioning: quick-cooling, cold-stor-
ing, quick-cooling and cold-storing, quick-freezing, very cold-stor-
ing, quick-freezing and very cold-storing.
* Adapt to manage quick-cooling/freezing for temperature or time.
* Alarm buzzer included.
* One 3-digit 12.5 mm (0.49 ") high red LED display showing the
temperature read by the needle/cabinet probe.
* One 3-digit 12.5 mm (0.49 ") high red LED display showing the
remaining time at the end of a cycle/phase of quick-cooling/freezing.
* Adapt to manage electrical, hot gas and air defrost (automatic and
manual).
* Three measure inputs (cabinet, evaporator and needle probe) for
PTC probe.
* One configurable door-switch digital input.
* One configurable locking digital input.
* Four relay outputs of which one 16 (2) A @ 250 Vac relay for one 1½
HP compressor (NO) management and three 6 (2) A @ 250 Vac relays
for evaporator fans (NO), defrost system (resistances or by-pass
valve, change-over) management and cabinet light control (NO).
EK 825A is an ON-OFF digital controller studied for quick-cooler/freezer management through the compressor, evaporator fans, defrost (for time-
temperature) and cabinet light output control.
The instrument basically permits the control, according with the established parameters, automatic cycles of quick cooling/freezing of (pre-cooked
or at environmental temperature) food temperature, using the compressor at its best, in order to preserve the product quality.
The controller has principally six different cycles of functioning configurable according with the norms and selectable through the keys located
on the frontal panel:
quick-cooling (for temperature or time), during which the instrument regulates the quick-cooling of food temperature, verifying that it happens
within the maximum established time
cold-storing, during which the instrument works as a normal thermostat (with evaporator fans and defrost management) and regulating the
cabinet temperature at the established value
quick-cooling (for temperature or time) and cold-storing, during which the instrument at fist executes the phase of quick-cooling and at its
end automatically moves to the phase of cold-storing
quick-freezing (for temperature or time), similar to the cycle of quick-cooling
very cold-storing, similar to the cycle of cold-storing
quick-freezing (for temperature or time) and very cold-storing, during which the instrument at first executes the phase of quick-freezing and
at its end automatically moves to the phase of very cold-storing.
In order to assure a correct execution of a cycle/phase of quick-cooling/freezing for temperature of pre-cooked (hot) food temperature it is necessary
that the needle probe is properly positioned inside the product: so, the instrument, at the beginning of the cycle, executes a test to verify the
proper insertion of the needle probe; the overcoming of this test permits the execution of the cycle/phase, contrary some alarm signals gets
activated.
The four outputs of which one 16 (2) A @ 250 Vac relay with NO contact (compressor output) and three 6 (2) A @ 250 Vca relays with NO contact
(evaporator fans and cabinet light output)) and change-over contact (defrost output) permit the direct management of loads, in small power
refrigeration systems, without using auxiliary relays.
The device is provided of two temperature alarms (that can be disabled): the intervention of this kind of alarm activates the alarm buzzer with intermittent
beep and the contemporary showing on the display of a proper temperature value bur alternated to an alarm code.
Others alarm conditions (not proper kind of probe, defective probe, wrong connection, temperature outside the limits permitted by the used probe,
etc.), activate the alarm buzzer with intermittent and the contemporary showing on the display of univocal alarm codes that permit a sudden
intervention aganist the causes of failure.
ON-OFF DIGITAL CONTROLLER FOR QUICK-
COOLER/FREEZER MANAGEMENT
EK 825A