Emerson Process Management EC2-352 User Manual

EC2-352 Display Case and Coldroom Controller

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 EC2-352 is a dedicated refrigeration controller with superheat and a driver for
an Alco Controls Electric Control Valve EX2. In addition the EC2-352 controls air
temperature and manages defrost and fan(s).

6

7

A PT5 pressure transmitter (1) and an ECN-Pxx pipe temperature sensor (2)
measure saturated suction gas pressure and suction gas temperature at the
evaporator 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 optimizing the refrigerant mass flow
through the evaporator. The ECN-Sxx 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 compressor (7),
defrost heater (9) and evaporator fan (8). 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

Network

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8

9

3

1

5

2

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Technical Data

EC2 Series Controller

Power supply 24VAC ±10%; 50/60Hz; Class II

Power consumption 20VA max including EX2

Communication TCP/IP Ethernet 10MBit/s

Plug-in connector size Removable screw terminals

wire size 0.14 … 1.5 mm

Temperature
storage
operating

-20 … +65°C

0 … +60°C
Humidity 0…80% r.h. non condensing
Protection class IP65 (front protection with gasket)
Pressure transmitter input 24VDC, 4...20mA
Output relays (3) SPDT contacts, AgCdO
Inductive (AC15) 250V/2A
Resistive (AC1) 250V/8A; 12A total return current
Triac output for EX2

24V AC, 0.1 … 1A
Electrical Control Valve
Coil (ASC 24V only)

Marking

Mounting

The EC2-352 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)

2

EC2 analog inputs are for dedicated sensors only and should not be connected to
any other devices. Connecting any EC2 inputs to mains voltage will permanently
damage the EC2.
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 3

rd

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.

EC2-352_65117_EN_R05.doc Replacement for Rev.:04 1 / 4 PCN : 864 925 16.09.2009

EC2-352 Display Case and Coldroom Controller

Operating Instructions

Recommended Sensor Positions in Detail:

(2) ECN-Pxx coil-out temperature sensor: Position directly after the evaporator on
the common suction line.
(3) ECN-Sxx air-in temperature sensor: Position in the middle of the cabinet as
high as possible.
(4) ECN-Sxx 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.

(1) PT5-07M suction pressure transmitter: Position on the common suction line
close to coil-out temperature sensor (2)
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

• 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

• Press SEL to temporarily confirm the new value and display its code;

• Repeat the procedure from the beginning "press

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.

or until “12” is displayed (password)

or to increase or decrease the value;

or to show..."

GB

Defrost Activation:

A defrost cycle can be activated locally from the keypad:

• Press the

• Press

• Press SEL to confirm password

The defrost cycle is activated.

Special Functions:

The Special Functions can be activated by:

• Press

• Press

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: Displays the current TCP/IP address

• 6: Set the controller's TCP/IP address to 192.168.1.101 (default value). This

change is only temporary. A power down will reset the previous address.

• 7: 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 permanently shown on the display can be selected by the user
(parameter /1). In case of an alarm, the alarm code is displayed alternately with the
selected data. The user can inhibit the alarm code.
It is possible to temporarily display these values. This is a useful feature when
initially setting-up the system without the aid of the WebPages. Press the SEL
button to scroll through all possible displayable data.. The display will show for
one second the numerical identifier of the data (see /1 parameter) and then the
selected data. After two minutes the display will return to the by parameter /1
selected data. This action is only valid when parameter H2 = 3.

button for more than 5 seconds, a flashing “0” is displayed

or until “12” is displayed (password)

and together for more than 5 seconds, a flashing “0” is displayed.

or until the password is displayed (default = 12). If password was

Logical status of compressor relay

Ethernet activity LED

(only active when service pin is pressed)

Logical status of fan relay

Logical status of defrost heater relay

Alarm condition

IR LED

EC2-352_65117_EN_R05.doc Replacement for Rev.:04 2 / 4 PCN : 864 925 16.09.2009