Evco S.p.A. • Code 104K204E05 • page 1/5
EVK204 Digital controller for ventilated refrigerating units, with HACCP and Energy Saving functions version 1.05
GB ENGLISH
1 PREPARATIONS
1.1 Important
Please read these instructions carefully prior to installation and use,
and follow all the precautions for installation and electrical connec-
tions; keep these instructions with the device for future consultation.
1.2 Installazion
For the panel, using the snap-on brackets supplied; the dimensions
are given in mm (in).
DIMENS. MIN TYPICAL MAX
A 71.0 (2.795) 71.0 (2.795) 71.8 (2.826)
B 29.0 (1.141) 29.0 (1.141) 29.8 (1.173)
Recommendations for installation:
• the panel thickness must not exceed 8.0 mm (0.314 in)
• ensure that the operating conditions (operating temperature, hu-
midity, etc.) are within the limits indicated in the technical data sheets
• do not install the device near to any sources of heat (heating ele-
ments, hot air conduits, etc.), equipment containing powerful mag-
nets (large diffusers, etc.), areas affected by direct sunlight, rain, hu-
midity, excessive dust, mechanical vibration or shock
• in compliance with safety regulations, the device must be installed
correctly, and in such a way as to protect against any contact with
electrical parts; all safety devices must be fixed so that they cannot be
removed without the use of tools.
1.3 Electrical connections
With reference to the electrical circuit diagram:
• the service controlled by the fourth output depends on param. P4
• the service controlled by the fourth output depends on param. u1
• port 1 (by request) is the serial port used for communication with the
monitoring system (by means of a serial interface, via TTL, using the
MODBUS communication protocol) or with the programming key;
the port must not be used for both purposes simultaneously
• port 2 (by request) is the port used for comm. with the remote indi-
cator; the indicator displays the quantity assigned by parameter P6.
Points to note in relation to electrical connections:
• do not use electric or pneumatic screw-wrenches on the terminal
board
• if the device has been moved from a cold to a warm environment,
condensation may have formed inside; please wait approx. one
hour prior to switching on
• ensure that the voltage, frequency and operational power of the
device are compatible with the local power supply
• disconnect the power prior to proceeding with any kind of main-
tenance operation
• do not use the device as a safety device
• for repairs and any information relating to the device, contact the
Evco dealer network.
2 USER INTERFACE
2.1 Introductory comments
The device has the following operational states:
• "on" (power is connected and the device is on: the regulators may
be switched on)
• "stand-by" (power is connected but software sets the device to off:
the regulators are switched off; the option of manually switching
on/off the cabinet light or the auxiliary output depends on param-
eter u2).
The term "switching on" is understood to mean switching from the
stand-by state to on; the term "switching off" is understood to mean
switching from the on state to the stand-by state.
When the device is switched on, the status it was in when the power
was interrupted is restored.
2.2 Manual switching on/off of the device
• ensure the keyboard is not blocked and that no procedures are
running
• press
It is also possible to switch the device on/off using the multifunction
input.
2.3 The display
If the device is switched on, then during normal operation the display
will show the quantity assigned by parameter P5:
• if P5 = 0, the display will show the temperature of the cabinet
• if P5 = 1, the display will show the operational setpoint
• if P5 = 2, the display will show the evaporator temperature
• if P5 = 3, the display will show "cabinet temperature - evaporator
• if P5 = 4, the display will show the temperature detected by the
While in stand-by mode the display is switched off.
2.4 Displaying the cabinet temperature
• ensure the keyboard is not blocked and that no procedures are
• press for 2 s: the display will show the first available label
• press or to select “Pb1”
• press
To exit the procedure:
• press or do not operate the keypad for 60 s
• press or until the display shows the quantity assigned by
Alternatively:
• press
2.5 Displaying the evaporator temperature
• ensure the keyboard is not blocked and that no procedures are
• press for 2 s: the display will show the first available label
• press or to select “Pb2”
• press
To exit the procedure:
• press or do not operate the keypad for 60 s
• press or until the display shows the quantity assigned by
Alternatively:
• press
If there is no evaporator probe (parameter P3 = 0), label "Pb2" will not
be displayed.
2.6 Displaying the temperature detected by the auxiliary
• ensure the keyboard is not blocked and that no procedures are
• press for 2 s: the display will show the first available label
• press or to select “Pb3”
• press
To exit the procedure:
• press or do not operate the keypad for 60 s
• press or until the display shows the quantity assigned by
Alternatively:
• press
If the function of the fourth input is not that of the auxiliary probe
(parameter P4 = 0 or 3), then label "Pb3" will not be displayed.
2.7 Manual activation of defrosting
• ensure the keyboard is not blocked and that no procedures are
for 4 s.
temperature"
auxiliary probe (only if parameter P4 is set to 1 or 2).
running
parameter P5 or do not operate the keypad for
60 s.
running
parameter P5 or do not operate the keypad for
60 s.
probe (only if parameter P4 is set to 1 or 2)
running
parameter P5 or do not operate the keypad for
60 s.
running
• press for4 s.
If the function of the evaporator probe is that of the defrosting probe
(parameter P3 = 1) and on activation of defrosting the evaporator
temperature is above that established by parameter d2, then defrost-
ing will not be activated.
2.8 Manual switching on/off of the cabinet light (only if
parameter u1 is set to 0)
• ensure no procedures are running
• press
It is also possible to switch the cabinet light on/off remotely using the
microport and multifunction inputs; see also parameter u2.
2.9 Switching on the demister (only if parameter u1 is set
to 1)
• ensure the device is switched on and no procedures are running
• press for 2 s: the demister heater will be switched on for the
period of time established by parameter u6.
Manual switching off of the demister is not permitted.
2.10 Manual switching on/off of the auxiliary output
(only if parameter u1 is set to 2)
• ensure the keyboard is not blocked and that no procedures are
running
• press
It is also possible to switch the auxiliary output on/off using the
multifunction input.
If the auxiliary output has been switched on manually, then it will be
permitted to switch it off the same way (the same principle applies for
remote switching on); see also parameter u2.
2.11 Blocking/unblocking the keyboard
To block the keyboard:
• ensure no procedures are running
• press and for 2 s: the display will show "Loc" for 1 s.
If the keyboard is blocked, it will not be possible to:
• manually switch the device on/off
• display the cabinet temperature (using the procedure indicated in
paragraph 2.4)
• display the evaporator temperature (using the procedure indicated
in paragraph 2.5)
• display the temperature detected by the auxiliary probe (using the
procedure indicated in paragraph 2.6)
• manually activate defrosting
• manually switch the auxiliary output on/off
• view information pertaining to the HACCP alarms
• delete the HACCP alarm list
• change the operational setpoint using the procedure indicated in
paragraph 3.1 (the operational setpoint may also be set by means of
parameter SP)
• display the total hours of compressor operation
• delete the total hours of compressor operation.
These operations will cause the label "Loc" to be displayed for 1 s.
To unblock the keyboard:
• press and for 2 s: the display will show "UnL" for 1 s.
2.12 Buzzer mute
• ensure no procedures are running
• press any key (the first key press does not trigger the associated effect).
If parameter u1 is set to 4 (or the service controlled by the fourth output
is the alarm output) and parameter u4 is set to 1, then pressing he key
will also deactivate the alarm output.
3 SETTINGS
3.1 Setting the operational setpoint
• ensure the keyboard is not blocked and that no procedures are
running
• press the LED will flash
• press or within 15 s; also see parameters r1, r2 and r3
• press or do not operate the keypad for 15 s.
It is also possible to set the operational setpoint by means of parameter
SP.
3.2 Setting the configuration parameters
To access the procedure:
• ensure no procedures are running
• press and for 4 s: the display will show “PA”
• press
• press or within 15 s to set “-19”
• press or do not operate the keypad for 15 s
• press and for 4 s: the display will show “SP”.
To select a parameter:
• press or
To select a parameter:
• press
• press or within 15 s
• press or do not operate the keypad for 15 s.
To exit the procedure:
• press and for 4 s or do not operate the keypad for 60 s.
Interrupt the device power supply after altering the param-
eters.
3.3 Resetting configuration parameter default values
• ensure no procedures are running
• press and for 4 s: the display will show “PA”
• press
• press or within 15 s to set “743”
• press or do not operate the keypad for 15 s
• press and for 4 s: the display will show “dEF”
Evco S.p.A. • Code 104K204E05 • page 2/5
• press
• press or within 15 s to set “149”
• press or do not operate the keypad for 15 s: the display will flash
• interrupt the power to the device.
Ensure that the parameter default values are appropriate,
particularly if the probes are PTC type.
4 HACCP
4.1 Introductory comments
The device is capable of storing up to 3 HACCP alarms.
The device can furnish the following information:
• the critical value
• the alarm duration (from 1 minute to 99 hours and 59 minutes,
Warnings:
• the device records minimum temperature alarms and
• the instrument updates the information on the alarms
• no alarms will be recorded if the device is in stand-by
When the cause of the alarm is resolved, the display returns to normal.
The HACCP LED provides information relating to the status of the
HACCP alarm memory; please refer to paragraph 6.1.
4.2 Viewing HACCP alarm information
To access the procedure:
• ensure the keyboard is not blocked and that no procedures are
• press
• press or to select “LS”
• press the display will show one of the codes reported in the
To select an alarm:
• press or (to select "AH" for example).
To display the information relating to the alarm:
• press the HACCP LED will stop flashing and remain on and the
The display shows each piece of information for 1 s.
To exit the information series:
• press the display will show the selected alarm.
To exit the procedure:
• exit the information series
• press or until the display shows the quantity assigned by
Alternatively:
• exit the information series
• press
If the instrument has stored no alarm, the label “LS” will not be shown.
4.3 Deleting the HACCP alarm list
• ensure the keyboard is not blocked and that no procedures are
• press for 2 s: the display will show the first available label
• press or to select “rLS”
• press
• press or within 15 s to set “149”
• press or do not operate the keypad for 15 s: the display will flash
If the instrument has stored no alarm, the label “rLS” will not be shown.
5 COMPRESSOR OPERATION TIME COUNTER
5.1 Introductory comments
The device is capable of recording up to 9,999 hours of compressor
function, after which the number "9999" flashes.
5.2 Displaying the compressor operation time
• ensure the keyboard is not blocked and that no procedures are
• press for 2 s: the display will show the first available label
"dEF" for 4 s, after which the device will exit the proce-
dure
partial if the alarm is ongoing).
CODE ALARM TYPE (AND CRITICAL VALUE)
AL minimum temperature alarm (the minimum temperature
of the cabinet or the minimum temperature detected by
the auxiliary probe during an any alarm state of this type)
AH maximum temperature alarm (the maximum temperature
of the cabinet or the maximum temperature detected by
the auxiliary probe during an any alarm state of this type)
id microport input alarm (the maximum temperature of the
cabinet during an any alarm state of this type); see also
parameter i4
maximum temperature alarms providing the temperature
associated with the alarm is the cabinet temperature
(parameters A0 and A3 = 0) or the temperature measured
by the auxiliary probe, providing its function is that of
display probe (parameter P4 = 1 and parameters A0 = 2
and A3 = 1)
on condition that the critical value is more critical than
the one the instrument has stored or on condition that
the information has already been displayed
mode.
running
for 2 s: the display will show the first available label
table in paragraph 4.1.
display will show the following information in succes-
sion (for example):
INFO MEANING
8,0 the critical value is 8.0 °C/8 °F
dur the display is about to show the alarm duration
h01 the alarm lasted for 1 hour (continued ...)
n15 the alarm lasted for 1 hour and 15 minutes
AH the selected alarm
parameter P5 or do not operate the keypad for
60 s.
running
"- - - -" for 4 s and the HACCP LED will be turned off, after
which the device will exit the procedure.
running
• press
• press
To exit the procedure:
• press or do not operate the keypad for 60 s
• press or until the display shows the quantity assigned by
Alternatively:
• press
5.3 Resetting the compressor operation time
• ensure the keyboard is not blocked and that no procedures are
• press
• press
• press
• press or within 15 s to set “149”
• press or do not operate the keypad for 15 s: the display will flash
6 INDICATORS
6.1 Indicators
or to select “CH”
parameter P5 or do not operate the keypad for
60 s.
running
for 2 s: the display will show the first available label
or to select rCH”
"- - - -" for 4 s, after which the device will exit the procedure.
LED MEANING
compressor LED
if on then the compressor is on
if flashing:
• the operational setpoint is being changed
• compressor protection is ongoing (parameters C0, C1,
C2 and i7)
defrosting LED
if on, defrosting ongoing
if flashing:
• defrosting has been requested, but compressor protec-
tion is ongoing (parameters C0, C1 and C2)
• drip-draining is ongoing (parameter d7)
• refrigerant fluid heating is ongoing (parameter dA)
Evaporator fan LED
if on then the evaporator fan is on
if flashing, then evaporator fan stop is ongoing (parameter
F3)
HACCP HACCP LED
if on, you will have not shown all the information on the
HACCP alarms
if flashing, the instrument will have stored at least one new
HACCP alarm
if off, you will have shown all the information on the HACCP
alarms or you will have cancelled the list of the HACCP
alarms
Maintenance LED
if on, compressor maintenance will be required (param-
eter C10)
alarm LED
if on, an alarm state or an error is ongoing
on/stand-by LED
if on, the device is in stand-by mode
°C degree Celsius LED
if on, the unit of measurement for temperature is degrees
Celsius (parameter P2)
if flashing, then the Energy Saving function is in operation
(parameters r4 and i5)
°F degree Fahrenheit LED
if on, the unit of measurement for temperature is degrees
Fahrenheit (parameter P2)
if flashing, then the Energy Saving function is in operation
(parameters r4 and i5)
Multifunction LED
parameter u1 is set to 0 (i.e. the service control-
led by the fourth output is the cabinet light)
if on, the cabinet light will have been switched on manu-
ally
if flashing, the cabinet light will have been turned on re-
motely (parameter i0)
parameter u1 is set to 1, 4, 5, 6 or 7
if on, the service controlled by the fourth output will be
turned on
parameter is set to 2 (i.e. the service controlled
by the fourth output is the auxiliary output)
if on, the auxiliary output will have been turned on manu-
ally
if flashing, the auxiliary output will have been turned on
remotely (parameter i5)
parameter u1 is set to 3 (i.e. the service control-
led by the fourth output is compressor 2)
if on, compressor 2 is on
if flashing, compressor 2 delay is ongoing (parameter C9)
CODE MEANING
Loc the key and/or operational setpoint are blocked (param-
eter r3), refer to paragraph 2.11
- - - - the quantity for display is not available (e.g. the probe is
absent)
7 ALARMS
7.1 Alarms
CODE MEANING
AL Minimum temperature alarm (HACCP alarm)
Remedies:
•check the alarm temperature
• check parameters A0, A1 and A2
Main consequences:
• if parameter A0 is set to 0 or if parameter P4 is set to 1 and
parameter A0 is set to 2, the device records the alarms, on
condition that the instrument has stored no alarm of this
type or on condition that the critical value is more critical
than the one the instrument has stored
• if parameter u1 is set to 4, the alarm output will be acti-
vated
AH Maximum temperature alarm (HACCP alarm)
Remedies:
• check the alarm temperature
• check parameters A3, A4 and A5
Main consequences:
• if parameter A3 is set to 0 or if parameter P4 is set to 1 and
parameter A3 is set to 1, the device records the alarms, on
condition that the instrument has stored no alarm of this
type or on condition that the critical value is more critical
than the one the instrument has stored
• if parameter u1 is set to 4, the alarm output will be acti-
vated
id Microport input alarm (HACCP alarm)
Remedies:
• check the causes which activated the input
• check parameters i0, i1 andi4
Main consequences:
• the outcome set by parameter i0
• if parameter i4 is set to 1, the device records the alarms,
on condition that the instrument has stored no alarm of
this type or on condition that the critical value is more
critical than the one the instrument has stored (however
providing parameter i2 is not set to -1)
• if parameter u1 is set to 4, the alarm output will be acti-
vated
iA Input malfunction alarm (only if parameter P4 is set to 3)
Remedies:
• check the causes which activated the input
• check parameters i5 and i6
Main consequences:
• if parameter i5 is set to 4, the device will continue to
operate as normal
• if parameter i5 is set to 5, the compressor will be switched
off
• if parameter u1 is set to 4, the alarm output will be acti-
vated
iSd Device blocked alarm (only if parameter P4 is set to 3)
Remedies:
• check the causes which activated the input malfunction
• switch the device off then on, or disconnect the power
supply
• check parameters i5, i6, i7, i8 and i9
Main consequences:
• the regulators will be switched off
• if parameter u1 is set to 4, the alarm output will be acti-
vated
COH Condenser overheating alarm (only if parameter P4 is set
to 3)
Remedies:
• check the condenser temperature
• check parameter C6
Main consequences:
• if parameter u1 is set to 4, the alarm output will be acti-
vated
CSd Compressor blocked alarm (only if parameter P4 is set to 3)
Remedies:
• check the condenser temperature
• switch the device off and then on again: if on switching
back on again the condenser temperature is still above
the value established by parameter C7, it will be neces-
sary to disconnect the power supply and clean the con-
denser
• check parameter C7
Main consequences:
• the compressor and evaporator fan will be switched off
• if parameter u1 is set to 4, the alarm output will be acti-
vated
When the cause that triggered the alarm has been resolved, the device
will restore normal operation, except for the following alarm states:
• the device blocked alarm (code "iSd") which requires the device be
switched off or the power supply disconnected
• the compressor blocked alarm (code "CSd") which requires the
device be switched off or the power supply disconnected.
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