Emerson Display Case And Cold Room Controller Ec2 391 Users Manual 391_65136_EN_R01

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EC2-391 Display Case and Coldroom Controller

GB

Operating Instructions
Note: This document contains short form instructions for experienced users.
Use last column in List of Parameters to document your individual settings.
More detailed information can be found in the User Manual.

The EC2-391 is a dedicated refrigeration controller with superheat and a driver for
an Alco Controls Electric Control Valve EX2. In addition the EC2-391 controls air
temperature and manages defrost and fan(s).

Technical Data
EC2 Series Controller
Power supply

24VAC ±10%; 50/60Hz; Class II

Power consumption

20VA max including EX2

Communication
Plug-in connector size

LonWorks® Interface, FTT10, RJ45 connector
Removable screw terminals
wire size 0.14 … 1.5mm2

Temperature
storage
operating
Humidity
Protection class
Pressure transmitter input
Output relays
(3)

Triac output for EX2
Electrical Control Valve
Coil (ASC 24V only)
Marking

-20 … +65°C
0 … +60°C
0…80% r.h. non condensing
IP65 (front protection with gasket)
24VDC, 4...20mA
SPDT contacts, AgCdO
Inductive (AC15) 250V/2A
Resistive (AC1) 250V/8A; 12A total return current
24V AC, 0.1 … 1A

Mounting

Two ECN-Pxx pipe temperature sensors (1) and (2) measure suction gas
temperatures at the evaporator inlet / outlet and feed the signals into the superheat
control loop. The superheat controller output modulates the opening of the EX2
pulse width modulated Electrical Control Valve (6) thus optimising the refrigerant
mass flow through the evaporator. The air temperature sensors (3) and (4) measure
air-in and out temperature of the evaporator and feed signals into the air
temperature thermostat. The ECN-Fxx fin sensor (5) is used for defrost
termination. The controller has 3 relay outputs to control the defrost heater (9), the
evaporator fan (8) and an optional output (7). Please consult the technical data
(right) for input and output ratings.
In case of power loss, due to the positive shut-off characteristics of the EX2
Electrical Control Valves, a liquid line solenoid valve is not needed to prevent
flooding of the compressor.

!
•
•
•
•
•
•

Safety instructions:

Read installation instructions thoroughly. Failure to comply can result in
device failure, system damage or personal injury.
The product is intended for use by persons having the appropriate
knowledge and skills.
Ensure electrical ratings per technical data are not exceeded.
Disconnect all voltages from system before installation.
Keep temperatures within nominal limits.
Comply with local electrical regulations when wiring

The EC2-391 can be mounted in panels with a 71 x
29 mm cutout. See dimensional drawing below for
space requirements including rear connectors.
Push controller into panel cutout.(1)
Make sure that mounting lugs are flush with outside
of controller housing
Insert allen key into front panel holes and turn
clockwise. Mounting lugs will turn and gradually
move towards panel (2)
Turn allen key until mounting lug barely touches
panel. Then move other mounting lug to the same
position (3)
Tighten both sides very carefully until controller is
secured. Do not over tighten as mounting lugs will
break easily.

Electrical Installation
Refer to the electrical wiring diagram (below) for electrical connections. A copy of
this diagram is labeled on the controller. Use connection wires/cables suitable for
90°C operation (EN 60730-1).

EC2 analog inputs are for dedicated sensors only and should not be connected to
any other devices. Important: Keep controller and sensor wiring well separated
from mains wiring. Minimum recommended distance 30mm.
Warning: Use a class II category transformer for 24VAC power supply
(EN 60742). Do not ground the 24VAC lines. We recommend to use one
transformer per EC2 controller and to use separate transformers for 3rd party
controllers, to avoid possible interference or grounding problems in the power
supply. Connecting any EC2 inputs to mains voltage will permanently damage the
EC2.

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Replacement for 00

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Operating Instructions
Recommended Sensor Positions in Detail:
(1) ECN-Pxx coil-in temperature sensor: Position on the first return bend of the
evaporator.
(2) ECN-Pxx coil-out temperature sensor: Position directly after the evaporator on
the common suction line.
(3) ECN-Pxx air-in temperature sensor: Position in the middle of the cabinet as
high as possible.
(4) ECN-Pxx air-out temperature sensor: Position asymmetric closer to the
expansion valve as high as possible.
(5) ECN-Fxx fin temperature sensor: Position on the evaporator, asymmetric closer
to the expansion valve.
Recommendations for mounting the pipe sensor: Insure proper thermal contact by
using a metallic pipe clamp or temperature resistant plastic straps. Do not use
standard plastic tie wraps (as used for electrical wiring) as they may become loose
over time, which could result in faulty temperature measurements and poor
superheat control performance. It is recommended to insulate the pipe temperature
sensor with ARMAFLEX™ or equivalent. The recommended position of the pipe
sensors is between 9 and 3 o’clock as shown in the picture.

Both air temperature sensors should be mounted on spacers in the air duct so that
there is airflow around.
Caution: The sensor cables can be extended if necessary. The connection must be
protected against water and dust.
The evaporator outlet temperature sensor should be mounted on the common
suction header of the evaporator.
A calibration correction can be made using the parameter u1 (see procedure
below).

Setup and Parameter Modification Using the Keypad
For convenience, an infrared receiver for the optional IR remote control unit is
build-in, enabling quick and easy modification of the system parameters when a
computer interface is not available.
Alternatively, the parameters can be accessed via the 4-button keypad. The
configuration parameters are protected by a numerical password. The default
password is “12”. To select the parameter configuration:
• Press the PRG button for more than 5 seconds, a flashing “0” is displayed
• Press or until “12” is displayed (password)
• Press SEL to confirm password
The first modifiable parameter code is displayed (/1).
To modify parameters see Parameters modification below.

Parameter Modification: Procedure
• Press or to show the code of the parameter that has to be changed;
• Press SEL to display the selected parameter value;
• Press or to increase or decrease the value;
• Press SEL to temporarily confirm the new value and display its code;
• Repeat the procedure from the beginning "press or to show..."
To exit and save the new settings:
• Press PRG to confirm the new values and exit the parameters modification
procedure.
To exit without modifying any parameter:
• Do not press any button for at least 60 seconds (TIME OUT).
• Press “ESC” on IR remote control.

EC2-391_65136_EN_R01.doc

Replacement for 00

Defrost Activation:
A defrost cycle can be activated locally from the keypad:
• Press the button for more than 5 seconds, a flashing “0” is displayed
• Press or until “12” is displayed (password)
• Press SEL to confirm password
The defrost cycle is activated.

Special Functions:
The Special Functions can be activated by:
• Press and together for more than 5 seconds, a flashing “0” is displayed.
• Press
or
until the password is displayed (default = 12). If password was
changed, select the new password.
• Press SEL to confirm password, a “0” is displayed and the Special Function
mode is activated.
• Press
or
to select the function. The number of special functions is dynamic
and controller dependent. See list below.
• Press SEL to activate the function without leaving the special function mode.
• Press PRG to activate the function and leave the special function mode.
Most of the Special Functions work in a toggle mode, the first call activates the
function, and the second call deactivates the function.
The indication of the function can only be displayed after exiting the special
function mode.
• 0: Display test function
• 1: Clear alarm messages
• 2: Cleaning mode. The cleaning mode is effectively a manual defrost with the
option of the fans on/off. The cleaning mode should not be used in order to
isolate the application for maintenance purposes.
• 3: Fans only
• 4: Set the electronic control valve to 100% open
• 5: Resets all parameters to the factory default setting. The controller will
indicate “oF” during the reset and the valve will close.

Display of Data:
The data to be shown on the display can be selected by the user. In case of an
alarm, the alarm code is displayed alternately with the selected data. The user can
inhibit the alarm code. Press the SEL button to scroll through all possible
displayable data.
The display will show for one second the numerical identifier of the data and then
the selected data. After two minutes the display will return to the by parameter /1
selected data.
It is possible to temporarily display the values of the different sensors. This is a
useful feature when initially setting-up the system without the aid of the
WebPages. Press the SEL sequentially. The value displayed on the screen
corresponds to the number corresponding to the /1 parameter. Action only valid
when parameter H2 = 3.
IR LED
Logical status of lighting relay
LON service LED
Logical status of fan relay
Logical status of defrost heater relay
Alarm condition

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Operating Instructions

List of Parameters
/ DISPLAY PARAMETERS
Min Max Unit Def. Custom
/1 Value to show
0
9
0
0 = Thermostat control temperature with Temp. alignment °C
1 = Air-in temperature °C
2 = Air-out temperature °C
3 = Alarm temperature °C
4 = Defrost termination temperature °C
5 = Coil-in temperature °C
6 = Coil-out temperature °C
7 = Calculated superheat °K
8 = Valve opening in %
9 = Displays defrost status
/2 Alarm suppression 0 = off, 1 = on
0
1
0
/5 Temperature Unit
0 = °C, 1 = °F
0
1
0
/6 Decimal point
0 = yes, 1 = no
0
1
0
/7 Display during defrost
0
2
0
0 = dF (= defrost mode); 1 = dF + defrost termination temp.
2 = dF + control temperature
/C Temperature alignment for /1=0
-20 20 K / °F 0.0
A ALARM-PARAMETERS
A0 Mean factor alarm temperature
0
100
%
100
A1 Low temp alarm delay
0
180
min
5
A2 High temp alarm delay
0
180
min
5
A3 Alarm delay after defrost
0
180
min
10
AH High temp alarm limit
AL
70 °C / K 40
AL Low temp alarm limit
-55 AH °C / K -50
At Alarm limit type
0
1
0
0=absolute temperatures °C; 1= relative temperatures K to setpoint
r THERMOSTAT-PARAMETERS
r1 Min setpoint
-50
r2
°C
-50
r2 Setpoint max
r1
60
°C
40
r3 Day/night control
0 = off, 1 = on
0
1
1
r4 Thermostat mode
0
4
1
0 = off, no thermostat function, continues cooling air in sensor monitoring
off, no temp. alarms generated
1 = cooling, deadband control:
cut in = set-point + difference
cut out = set-point
2 = cooling, modulating thermostat: cut in = set-point
cut out = set-point – difference /2
3 = heating, deadband control:
cut in = set-point – difference
cut out = set-point
4 = on, external control using nvi Valve via SNMP. Air in and air out sensor
monitoring off. Temp. alarms will be generated
r6 Setpoint night
r1
r2
°C
4.0
r7 Differential night
0.1 20.0
K
2.0
r8 Mean factor, day operation
0
100
%
100
r9 Mean factor, night operation
0
100
%
50
rd Differential day
0.1 20.0
K
2.0
St Setpoint day
r1
r2
°C
2.0
d DEFROST PARAMETERS
d0 Defrost mode
0
2
1
0 = natural defrost, defrost heater not activated
pulsed defrost not possible
1 = forced defrost, defrost heater activated, pulsed
defrost possible
2 = forced defrost, defrost heater activated, pulsed defrost possible,
defrost termination using nviStartUp via SNMP
d1 Termination by:
0
3
0
0 = termination by temperature,
termination by time will generate an alarm
1 = termination by time,
termination by temperature will generate an alarm
2 = first, what ever comes first time or temperature, no alarm
3 = last, by time and temperature, no alarm
d2 Defrost termination sensor
0
1
1
0 = Dedicated defrost sensor must be installed
1 = Air-out sensor used for defrost termination
d3 Pulsed defrost
0
1
0
0 = off, no pulsed defrost, heaters switched off at defrost termination
temperature dt or max. time dP whatever is selected
1 = on, pulsed defrost, dd and dH in use, heaters are switched off at
dH and switched on again at dH – dd
d4 Defrost at startup
0 = no, 1 = yes
0
1
0
d5 Delay power up defrost
0
180
min
0
EC2-391_65136_EN_R01.doc

Replacement for 00

Min Max Unit Def. Custom
d6 Pump down delay
0
180
sec
0
Compressor will run during pump down delay while valve is closed
d7 Drain delay
0
15
min
2
d8 Injection delay
0
180
sec
0
Valve is open during injection delay while compressor is not running
d9 Demand defrost mode
0
2
0
0 = off, 1 = on, 2 = on together with
timed defrost
dd Pulsed defrost differential
1
20
K
2
dH Pulsed defrost setpoint
-40
dt
°C
5
dt Defrost termination temperature
-40 90
°C
8
dP Max defrost duration
0
180
min
30
dI Defrost interval
0
192
h
8
du Start up delay after synch
0
180
min
30
F FAN-PARAMETERS
F1 Fan startup by:
0 = on
0
4
0
1 = delayed by time Fd, error on temperature
2 = by temperature Ft, error on time
3 = first, whatever comes first time or temperature, no alarm
4 = last, time and temperature must come, no alarm
F2 During no cooling
0
3
0
0 = on; 1 = off; 2 = delayed by F4; 3 = off, when door open
F3 During defrost
0 = on, 1 = off
0
1
0
F4 Stop delay time
0
30
min
0
F5 During cleaning
0 = off, 1 = on
0
1
0
Fd Fan delay after defrost
0
30
min
0
Ft On temp after defrost
-40 40
°C
0
u SUPERHEAT PARAMETERS
u0 Refrigerant 0 = R22
1 = R134a
0
7
3
2 = R507 3 = R404A 4 = R407C
5 = R410A 6 = R124
7 = R744A
u1 Correction glide / dp
-20.0 20.0
K
0.0
Glide
= positive values
Pressure drop = negative values
u2 MOP control
0
1
0
0 = MOP off, 1 = MOP on
u3 MOP temperature
-40 40
°C
0
u4 Superheat mode
0 = off
0
2
1
1 = fixed superheat
2 = adaptive superheat
u5 Superheat init setpoint
u6
u7
K
6
u6 Superheat setpoint min.
3
u7
K
3
u7 Superheat setpoint max.
u6
20
K
15
uu Start opening
25
75
%
30
DIGITAL INPUT PARAMETERS
i0 S5 input
1 = inverse function
0
1
0
∩0 Functions for S5 0 = normal input
0
8
0
1 = cleaning
5 = day / night switch
2 = only fan
6 = compressor safety chain
3 = door contact
7 = defrost request
4 = permanent cooling
8 = defrost inhibited
DIGITAL OUTPUT PARAMETERS
o0 Output
1 = inverse function
0
1
0
n0 Functions for output 1 = alarm
0
1
0
H OTHER PARAMETERS
H2 Display access
0
4
3
0 = all disabled (Caution: access to controller only via LON
network possible)
1 = Keyboard enabled
2 = IR remote control enabled
3 = Keyboard and IR remote control; Temporary data display and
manual defrost enabled.
4 = Keyboard and IR remote control; Temporary data display
disabled. Control setpoint with SEL key and manual defrost
enabled.
H3 IR access code
0
199
0
H5 Password
0
199
12

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Operating Instructions

Formula for Mean Factors A0, r8, r9

Visualising Data: LON Monitoring Server

Temperature calculation by the following formula:
Temperature = Airin * (1 - Mean Factor / 100) + Airout * Mean Factor / 100
Examples:
Mean factor = 0 , Temperature = Air in
Mean factor = 100, Temperature = Air out
Mean factor = 50 , Temperature = Average between Air-in and Air-out

The EC2-391 has a LON communication interface enabling the controller to be
directly connected to a Monitoring Server. It can be connected by using the optional
cable assembly to a LON network (ECC-014, Order No. 804 381, with RJ45 to
open, cable length 3m).

Alarm Codes
E0
E1
E2

Coil in sensor alarm
Coil out sensor alarm
Air-in sensor alarm This Alarm Code is inhibited if no air-in sensor used
(A0, r8 and r9 = 100)
E3
Air-out sensor alarm This Alarm Code is inhibited if no air-out sensor used
(A0, r8 and r9 = 0) and fin sensor installed (d2 = 1)
E4
Fin sensor alarm This Alarm Code is inhibited if no fin sensor used (d2 = 0)
Explanations for E0 … E4 Alarms: No sensor connected, or the sensor and/or the
sensor cable is broken or short-circuited.
Er
Data error display - out of range
Data send to the display is out of range.
AH High temperature alarm
AL Low temperature alarm
AE Thermostat emergency operation
Air sensor failure, system is in continuous cooling mode
AF Valve Status
Valve closed due to compressor safety loop active
Ao Superheat, emergency operation
Sensor(s) failure
Ar
No refrigerant flow detected
No refrigerant flow was detected
Au Valve open 100% for more than 10 minutes
dt
Forced defrost termination (time or temperature)
Ft
Forced fan startup (time or temperature)

Neuron ID / Service PIN:
The service pin is available on the display. It is used to identify the controller in a
button for app. 1 second to send the Neuron ID. The
LON network. Press the
LED in the left upper corner will indicate the transmission of the Neuron ID.
The default settings may be modified remotely from the Monitoring Server via the
LON network. Consult the Monitoring Server user manual for more information.
It is also possible to display live graphical data on the server or to log data
containing the control temperature at defined intervals.

Messages
--In
Id

OF

dS
dP
dF
dd
dI
du
Cn
CL

No data to display
The display will show an “---” at node start up and when no data is send to
the display.
Reset to default values activated
The display will show an “In” when the factory default configuration data set
is initialized.
Wink request received
The display will show a flashing “Id” when the wink request was received.
The flashing “Id” will be shown on the display until the service button will
be pressed, or a 30 min delay timer will expire or a second wink request is
received.
Node is offline
The node is offline and no application is running. This is the result of a
network management command and will happen for example during node
installation.
Defrost standby
Pump down
Defrost cycle
Defrost drain delay
Defrost injection delay
Defrost start-up delay
Cleaning
Alarms are cleared

Emerson Electric GmbH & Co OHG is not to be held responsible for erroneous
literature regarding capacities, dimensions, applications, etc. stated herein.
Products, specifications and data in this literature are subject to change without
notice. The information given herein is based on technical data and tests which
EMERSON believes to be reliable and which are in compliance with technical

knowledge of today. It is intended only for use by persons having the appropriate
technical knowledge and skills, at their own discretion and risk. Since conditions of
use are outside of EMERSON’s control we cannot assume any liability for results
obtained or damages occurred due to improper application.
This document replaces all former versions

Emerson Electric GmbH & Co OHG - Postfach 1251 - Heerstraße 111 - D-71332 Waiblingen - Germany - Phone .49-(0)7151-509-0 - Fax .49-(0)7151-509-200
www.emersonclimate.eu
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