Evco EC3T20 User Manual download pdf

EC 3-T20

ON-OFF digital thermostat for compressor

and defrost (by stopping compressor) man-

agement supplied from main voltage

Operating instructions

Release 1/98 of September the twenty-fifth 1998

Code EC 3-T20 DOC E000

File 3t20e.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-T20 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) with a very low power consumption (1 VA).

In factory the instrument gets preset to accept at the measure input PTC/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 ones

requirements, to signal working conditions outside the safety limits.

EC 3-T20 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-T20 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-T20 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) and it is provided with one five

poles single line male connector (for the connection to the CLONE configurer/cloner and RICS

supervision systems), 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

- give the probe a protection able to insulate it against possible contacts with metal

parts or use insulated probes

Fig. 1

f3-t20.wmf

- 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

- 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

iu3120.wmf

If an alarm should be active the instrument 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 the key T1 during an alarm permits to silence

the buzzer.

EC 3-T20 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 ones

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

Configuration parameters are arranged on two levels, to protect the most tricky settings against

undesirable violations and they are arranged in families that can be recognized through the

initial letter of the label.

To gain access to the first level keep pushed at the same time for four seconds at least the keys

T1 and T2 (passed four seconds the instrument displays the label PA).

To select a parameter of the first level push and release over and over the key T1 or T2 as long

as the instrument displays the label of the desired parameter.

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

ms3vv.wmf

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-t20e.wmf

1 2

Summary of Contents

Page 1 - EC 3-T20

EC 3-T20ON-OFF digital thermostat for compressorand defrost (by stopping compressor) man-agement supplied from main voltageOperating instructionsRelea

Page 2 - HOW TO ORDER

To modify the parameter value keep pushed the key T3 (the instrument displays the actualvalue) and at the same time push and release over and over the