EVCO EC3L20 User Manual

Ec 3-l20, General informations, Getting started

EC 3-L20

ON-OFF digital thermostat for compressor

and defrost (by stopping compressor) man-

agement supplied from main voltage

Operating instructions
Release 1/00 of February the twenty-ninth 2000
Code EC 3-L20 DOC E001
File 3l20e.p65
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 INFORMATIONS

WHAT IS THE USE
EC 3-L20 is an ON-OFF digital thermostat studied for refrigerating systems management through

the compressor and defrost (by stopping compressor) management; the instrument can be

supplied from main voltage (230 Vac).
In factory the instrument gets preset to accept at the measure input NTC probes used in

refrigeration field at the moment.
Some parameters permit to set the thermostat to protect the compressor against overloads

due to several starts repeated in a short time, to manage the defrost according with ones

requirements.
EC 3-L20 is available in the 74 x 32 mm (2.91 x 1.25 in.) case and it is studied for panel

mounting with the equipped screw or spring brackets.

GETTING STARTED

INSTALLATION
EC 3-L20 was studied for panel mounting, panel cutout 71 x 29 mm (2.79 x 1.14 in.), with the

equipped screw or spring brackets (the overall dimensions and the panel cutout are related in

Fig. 3, the fixing systems suggested by the builder are related respectively in Fig. 4 and in

Fig. 5).
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

if not differently specified at the time of order, the instrument will be equipped

with screw brackets.

ELECTRICAL CONNECTION
EC 3-L20 is provided with two screw terminal blocks for cables up to 2.5 mm² (0.38 in.², for the

connection to the power supply, measure input and output), located on the instrument back

panel (the connections to derive are related in Fig. 6 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 1 and 2 are derived to the local power supply, even if the instrument is appar-

ently turned off

the probe is connected to a main voltage terminal; use double insulation probes

give the output a protection able to protect it against short circuit and overload

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

Fig. 1

f3-l20.wmf

if you have any questions or problems concerning the instrument please consult

Every Control (see the chapter BUILDER DATA).

USE

PRELIMINARY INFORMATIONS
After derived the connections related in Fig. 6, during the normal functioning the instrument

displays the temperature read by the cabinet probe.

Fig. 2

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If an alarm should be active the instrument displays the alarm code flashing as long as the

cause that has given it does not disappear (see the chapter SIGNALS AND ALARMS).
EC 3-L20 is provided with one working setpoint and with some configuration parameters that

get stored in a non volatile memory and that permit to set the instrument according with ones

requirements (see the chapter CONFIGURABILITY).
The output K 1 is associated to the compressor and to the working setpoint, it remains acti-

vated continuously as long as the temperature read by the cabinet probe reaches the working

setpoint and when it rises above the working setpoint of the hysteresis value (differential) the

output gets reactivated, except during a defrost.
Passed the defrost interval from the moment of the instrument start or from the moment in

which the instrument activates a defrost the instrument automatically activates the following

defrost.
Passed the defrost length from the moment in which the instrument activates a defrost the

defrost ends; during a defrost the output K 1 gets forced to the status OFF.
Keeping pushed the key T2 for four seconds at least the instrument activates a defrost.

WORKING SETPOINT SETTING (WORKING TEMPERATURE)
To modify the working setpoint value keep pushed the key T3 (the instrument displays the

actual value) and at the same time push and release over and over the key T1 or T2 as long as

the instrument displays the desired value (keeping pushed the key T1 or T2 the value gets

decreased or increased more quickly): after the modification release the key T3 last; during the

pressure of the key T3 the LED L1 flashes quickly to indicate that a working setpoint setting

procedure is running (to the release of the key T3 the instrument automatically turns out from

the working setpoint setting procedure).
ADDITIONAL INFORMATIONS
-

for the whole period of a corrupted memory data alarm the access to the working

setpoint setting procedure is refused

the working setpoint is programmable within the limits established with the param-

eters r1 and r2

the working setpoint value gets stored in a non volatile memory even if a lack of

power supply happens.

CONFIGURATION PARAMETERS SETTING
Keep pushed at the same time for four seconds at least the keys T1 and T2 (passed four

seconds the instrument displays the label /1).
To select a parameter push and release over and over the key T1 or T2 as long as the instru-

ment displays the label of the desired parameter.
To modify the parameter value keep pushed the key T3 (the instrument displays the actual

value) and at the same time push and release over and over the key T1 or T2 as long as the

instrument displays the desired value (keeping pushed the key T1 or T2 the value gets de-

creased or increased more quickly); after the modification release the key T3 last (to the

release of the key T3 the instrument displays the label of the parameter again).
To turn out from the configuration parameters setting procedure keep pushed at the same time

for four seconds at least the keys T1 and T2 or do not operate with the keys for fifty seconds

at least (time-out exit).

DIMENSIONAL DATA

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

Fig. 3

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INSTALLATION

WITH THE FIXING SYSTEMS SUGGESTED BY THE BUILDER
Panel mounting, with the equipped screw (Fig. 4) or spring brackets (Fig. 5) (third-scale drawing).

Fig. 4

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Fig. 5

ms3vm.wmf

ELECTRICAL CONNECTION

CONNECTIONS TO DERIVE
Instance of typical application.

BUILDER DATA

EVERY CONTROL 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.everycontrol.it

TO BE CAREFUL
This publication exclusively belongs to EVERY CONTROL and shall not be reproduced and distributed if not expressly authorized by the same EVERY CONTROL.
EVERY CONTROL 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.
EVERY CONTROL can not be considered responsible for damages caused from the inobservance of the additional informations.
EVERY CONTROL reserves the right to make any modification without prior notice and at any time without prejudice the basic functioning and safety characteristics.

Fig. 6

c3-l20e.wmf