EVCO EK820AP7 User Manual

Ek 820a

Fig. 2

EK 820A

ON-OFF digital controller for quick cooler

management

Operating instructions
Version 1.01 of 30th September 2004
File ek820a_eng_v1.00.pdf
PT
IMPORTANT:
The use of this new instrument is easy; but for safety reasons, it is

important read these instructions carefully before the installation or

before the use and follow all additional informations.
It is very important keep these instructions with the instrument for future

consultations.

ENGLISH

GENERAL INFORMA

GENERAL INFORMATIONS

TIONS

WHAT IS THE USE
EK 820A is an ON-OFF digital controller studied for quick cooler management (of foods

at ambient temperature or pre-cooked) which basic characteristics are the management of

ten cycles of functioning, the one 1½ HP compressor management, the quick cooling

modality selection (for temperature or time), the needle probe proper insertion verify, the

“manual defrost and ventilation”; besides, the instrument is provided with one door

switch digital input configurable to interact on the outputs activity and with one

locking digital input configurable to interact on the instrument status.
In factory the instrument gets preset to accept at the measure inputs PTC probes used in

refrigeration field at the moment.
EK 820A is available in the 72 x 144 mm (2.83 x 5.66 in.) case and it is studied for panel

mounting with the equipped screw brackets.

GETTING ST

GETTING STAR

ARTED

TED

INSTALLATION
EK 820A was studied for panel mounting, panel cutout 67 x 138 mm (2.63 x 5.43 in.),

with the equipped screw brackets (the overall dimensions and the panel cutout are

related in Fig. 3, the fixing system suggested by the builder is related in Fig. 4).
ADDITIONAL INFORMATIONS
-

the panel thickness must be included from 1 to 5 mm (0.04 to 0.19 in.)

verify if the using conditions (ambient temperature, humidity, etc.) are within the

limits indicated by the builder (see the chapter TECHNICAL DATA)

install the instrument in a location with a suitable ventilation, to avoid the inter-

nal overheating of the instrument

do not install the instrument near surfaces that can to obstruct the air-grating

(carpets, covers, etc.), heating sources (radiators, hot air ducts, etc.), locations

subject to direct sunlight, rain, humidity, excessive dust, mechanical vibrations

or bumps, devices with strong magnetos (microwave ovens, big speakers, etc.)

according with the safety norms, the protection against possible contacts with

electrical parts and parts protected with functional insulation only must be ensured

through a correct installation procedure of the instrument; all parts that ensure the

protection must be fixed so that they can not be removed if not with a tool.

ELECTRICAL CONNECTION
EK 820A is provided with two extractable screw terminal blocks for cables up to 2.5 mm²

(0.38in.², for the connection to the power supply, inputs and outputs) located on the instru-

ment back panel (the connections to derive are related in Fig. 5 and they are checkable on the

polyester label stuck on the instrument case).
ADDITIONAL INFORMATIONS
-

if the instrument is brought from a cold to a warm location, the humidity may

condense inside the instrument; wait about an hour before supply the instrument

verify if the operating power supply voltage, electrical frequency and power of

the instrument correspond to the local power supply (see the chapter TECHNICAL

DATA)

do not supply more instruments with the same transformer

if the instrument is installed on a vehicle, its power supply must be derived di-

rectly from the battery of the vehicle

give the instrument a protection able to limit the current absorbed in case of

failure

the instrument remains connected to the local power supply as long as the termi-

nals 27 and 28 are derived to the local power supply, even if the instrument is

apparently turned off

if the instrument is supplied from low voltage use low voltage loads

give the probes a protection able to insulate them against possible contacts with

metal parts or use insulated probes

give the outputs a protection able to protect them against short circuit and overload

do not try to repair the instrument; for the repairs apply to highly qualified staff

Fig. 1

if you have any questions or problems concerning the instrument please

consult Evco (see the chapter BUILDER DATA).

USE

PRELIMINARY INFORMATIONS
After derived the connections related in Fig. 5, the instrument reproposes the last settings

stored; if a lack of power supply happens during the count of a time, when the power supply

recovers the count gets reproposed from the beginning.

Pushing and releasing the key T3 the instrument turning ON (status ON) or turning OFF

(status STAND-BY), except during the configuration parameters setting procedure; the

LED L3 is associated to the instrument status, it is turned ON during the status ON and

it is turned OFF during the status STAND-BY.
If an alarm should be active the display DY1 displays the alarm code flashing and the buzzer

utters an intermittent beep as long as the cause that has given it does not disappear (see the

chapter SIGNALS AND ALARMS); pressure on a key during an alarm permits to silence the

buzzer.
During the status STAND-BY the display DY1 displays the temperature read by the cabinet

probe and all outputs are forced to the status OFF.
EK 820A is provided with ten cycles of functioning and with some configuration

parameters that get stored in a non volatile memory and that permit to set the instrument

according with one’s requirements (see the chapter CONFIGURABILITY).
QUICK COOLING FOR TEMPERATURE CYCLE
Pushing and releasing the key T4 during the status STAND-BY the cycle gets selected, except

during the configuration parameters setting procedure; the LED L4 is associated to the quick

cooling cycle, it is turned ON when the cycle is selected and it is turned OFF when the cycle is

not selected.
Pushing and releasing the key T10 the quick cooling for temperature modality gets selected;

the LED L10 is associated to the quick cooling for temperature modality, it is turned ON when

the modality is selected and it is turned OFF when the modality is not selected.
Pushing and releasing the key T3 the cycle gets activated; the LED L1 is associated to the quick

cooling/freezing, it is turned ON when the quick cooling/freezing is running and it is turned OFF

when the quick cooling/freezing is not running.

DIMENSIONAL DA

DIMENSIONAL DAT

OVERALL DIMENSIONS AND PANEL CUTOUT
The dimensions are expressed in millimetres and inches (fifth-scale drawing).

Fig. 3

INST

INSTALLA

ALLA

ALLATION

TION

WITH THE FIXING SYSTEM SUGGESTED BY THE BUILDER
Panel mounting, with the equipped screw brackets (fifth-scale drawing).

Fig. 4

ELECTRICAL CONNECTION

CONNECTIONS TO DERIVE
Instance of typical application.

BUILDER DA

BUILDER DAT

EVCO S.r.l.
Via Mezzaterra 6, 32036 Sedico Belluno ITALY
Phone 0039/0437852468 (a.r.) Fax 0039/043783648
Internet addresses
e-mail: [email protected]
http://www.evco.it
TO BE CAREFUL
This publication exclusively belongs to EVCO and shall not be reproduced and distributed if not expressly authorized by the same EVCO.
EVCO does not assume any responsibility in order to the characteristics, to the technical data and to the possible mistakes related herein or deriving from the use of the same.
EVCO can not be considered responsible for damages caused from the inobservance of the additional informations.
EVCO reserves the right to make any modification without prior notice and at any time without prejudice the basic functioning and safety characteristics.

Fig. 5