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EC3-X33
Stand-alone Superheat Controller
Technical Data
EC3-X33 is a stand-alone universal superheat controller for
air conditioning, refrigeration and industrial applications such
as chillers, industrial process cooling, rooftops, heat pumps,
package unit, close control, cold room, food process and air
driers. The optional ECD-002 Display/keypad Unit is
necessary for setup but not for operation of the controllers.
ECD-002 can be connected or disconnected to EC3-X33 at
any time.
Features EC3-X33
Superheat control in conjunction with Emerson stepper
motor driven Electrical Control Valves EX4 … EX8
Limitation of evaporating pressure (MOP)
Low superheat alarm
Feed through of 4…20mA signal from evaporator pressure
sensor to analogue output. This may also be connected to
pressure input of any other controller to avoid need for
multiple pressure sensors
Monitoring of sensors and sensor wiring and detection of
sensor and wiring failures
Intelligent alarm management in order to protect the
compressor i.e fail safe operation
Integral rechargeable battery to close Electrical Control
Valve in case of power loss
Electrical connection via plug-in type screw terminals
Aluminum housing for DIN rail mounting
EC3-X33 with ECD-002
Features ECD-002
2½ digit LED display with automatic decimal point
Indicator LEDs for valve opening/closing, external demand
and alarm
Connection to EC3 Series via ECC-Nxx or standard CAT5
patch cord with RJ45 connectors
Typical ordering package:
Description
Type
Emerson PCN
Superheat Controller
EC3-X33
097707
Terminal kit
K03-X32
097709
Temperature sensor
ECN-N60
097714
Electrical Control Valve
EX4, EX5, EX6, EX7 or EX8 *
*
Pressure sensor
PT5-07M
for R-22/R-124/R-134a/R-404A/R-407C/R-507C
097748
PT5-18M
for R-410A
097749
PT4-30M
for R-744
097728
Plug and cable assembly for pressure sensor
PT4-M60
097717
*For further details refer to: EX4, EX5, EX6, EX7, EX8 Electrical Control Valves datasheet FC-TD/ EX4-8
Part No.
807 783
807 644
804 497
*
802 350
802 851
802 334
804 805
Accessories (required for setting at start-up only):
Description
Type
Optional display/keypad
Cable connection between EC3-X33 and ECD-002
ECD-002
ECC-N30 or any standard Cat 5 patch cord with
RJ45 connectors
Replacement Battery for EC3
Emerson
PCN
097712
Part No.
097713
807 861
097693
807 790
807 657
Application
EC3-X33 as superheat controller can be applied for the following:
Superheat control of conventional evaporators such as shell and tube, plate heat exchanger, air coil etc.
Superheat control of subcoolers or economizers connected to suction pressure of compressor or intermediate pressure
of screw/scroll compressors having vapor or liquid injection connection
Superheat control of intermediate gas in two stage compressors
Superheat control of suction gas in conjunction with hot gas bypass
Superheat control of flooded evaporators
FC-TD/ EC3-X33
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July 2011
EC3-X33
Stand-alone Superheat Controller
Introduction
The EC3-X33 controls the opening of an electrical control
valves according to desired superheat. As Emerson Electrical
Control Valves (ECV) are able to a provide positive shut-off
function better than conventional solenoid valves, there will be
no flow through Emerson ECV as long as the compressor is not
running. In the event of cooling request and compressor startup, EC3-X33 needs to be informed. This can be achieved by a
digital input. EC3-X33 will start to control the refrigerant mass
flow stand alone by precise positioning of the ECV under
different operating conditions such as compressor start-up,
start of further compressor, high head pressure, low head
pressure, high load, low load and partial load operation.
EC3-X33 is capable for diagnostics and alarm. The alarm can
be received via relay output as well as optical LED/alarm code
on ECD-002.
Algorithm
The superheat control algorithm is self-adapting, so that it
automatically adjusts itself to the characteristics of the
evaporator at regular intervals. This guarantees optimal
superheat control performance for different types of
evaporators, as well as when the operating conditions of the
evaporator change over time.
Superheat Control function
By receiving two measured values from Emerson pressure
sensor PT4 and Emerson temperature sensor ECN-N60, EC3X33 calculates the actual superheat and compares with preset
superheat. EC3-X33 operates the Electrical Control Valve in
order to keep superheat at desired setpoint under various
operating conditions.
The superheat setpoint is adjustable between 6°F and 60°F. If
low superheat alarm function is disabled, it is possible to adjust
the superheat set point below 6°F down to 1°F for special
applications such as flooded evaporators.
MOP function
To avoid overload of the compressor motor, the MOP function
of the EC3-X33 limits the evaporating pressure to a predetermined value. This can be adjusted to match the safe
operating envelope of the compressor. MOP setpoints are
entered as saturation temperature values to match published
safe operating data of compressor manufacturers and to avoid
unnecessary manual conversions from temperature into
pressure values. The MOP function may be totally disabled,
when not needed.
Low superheat alarm
Liquid flooding may lead to serious damage of compressors
and must be avoided. The built-in low superheat alarm function
of the EC3-X33 detects low superheat conditions and
deactivates the alarm relay. If the alarm relay is wired into the
serial safety loop, the compressor will be switched off when a
low superheat alarm occurs.
Digital input status
The digital input is the interface between EC3-X33 and system
controller. The digital status depends on the system’s
compressor/thermostat.
Commander Operating condition Digital input status
Compressor
Compressor starts
Closed / 24V (Start)
Compressor stops
Open / 0V (Stop)
Thermostat
Demand (compressor Closed / 24V (Start)
must be ON)
No demand
Open / 0V (Stop)
FC-TD/ EC3-X33
Shut-off function
When digital input is open (0V), the EC3-X33 will drive the
electrical control valve to the closed position. Due to the
positive shut-off capabilities of the EX4/5/6/7/8 valves a
separate liquid line solenoid valve is not required. The shut-off
function is guaranteed in case of power loss due to built-in
internal battery.
Analogue output (4-20mA signal) function
EC3-X33 requires the outlet pressure level of the evaporator for
superheat and MOP control. The output signal from PT4 is
used by EC3-X33 and again provided as a 4...20mA signal
(galvanized) for the connection to any other third party
controller, which can receive a 4...20mA signal. Please see the
wiring diagram for more details. If the system controller does
not have the capability of using this signal, the terminal will not
be wired to any other device.
Pump down function
Emerson Electrical Control Valves can be driven to close
position while the compressor is running for pump down
function. There are two possibilities to achieve this function:
1) The valve will be driven to close position by interruption of
the digital input. The compressor can be turned off by a
pressure switch and / or a timer.
2) By using 4 to 20 mA analogue output connected to system
controller.
In both cases, the initiation and termination of pump down is
under the system controller functionality/responsibility.
Safety / internal battery function
In the event of a power failure to the entire system, a stepper
motor driven valve would not be able to move. Due to the
differential pressure between condenser and evaporator, the
refrigerant would continue to flow through the valve if the valve
is open. The compressor must be protected after power
recovery against flood- back. The EC3-X33 contains an internal
rechargeable battery and smart battery charge control.
Optimum battery life is achieved through temperature
compensated charge cycles.
Alarm and maintenance functions
EC3-X33 provides several alarms to facilitate diagnosis as well
as shut down of compressor/system if the alarm relay is wired
into the serial safety loop. Built-in diagnostic routines constantly
monitor battery health and sensors the Electrical Control Valve
and the associated wiring for open and short circuits. When
such errors are detected, the controller goes into an alarm
condition and closes the valve.
In addition to hardware errors, the EC3-X33 will monitor the
minimum operating superheat. If the superheat drops below
1°F for a continuous period of one minute, the low superheat
alarm will occur. The low superheat alarm can be disabled for
applications such as a flooded evaporator, where a lower
operating superheat is required.
In the case of an alarm, the EC3-X33 will close the valve, and
the alarm relay will be deactivated. Alarm codes such as alarm
LED will be available if the optional display/keypad, ECD-002,
is connected to EC3-X33
All alarms are automatically cleared after correction. Battery
alarm and low superheat alarm can be modified for manual
reset.
Alarm relay function
Alarm relay contains a SPDT contact. If the relay is wired to the
system controller, it is possible to stop the compressor/system.
The alarm relay is activated during normal operation and
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July 2008
EC3-X33
Stand-alone Superheat Controller
deactivated during alarm conditions such as supply power
interruptions.
Wiring Diagram
Start-up configuration function
Built-in valve opening (%) at start-up for a certain period of time
helps the compressor’s start-up and prevents erratic low
pressure cut-out for the following cases:
Operation of systems with air cooled condensers in low
ambient temperatures
Compressor start-up after a long standby time in a low
ambient environment
Start-up of very large single stage compressor capacity
Emerson Pressure Sensor PT4 function
The pressure sensor measures the saturation pressure at the
outlet of the evaporator. The output signal is 4 to 20 mA
corresponding to a pressure range. Based on the type of
refrigerant and system, different types of pressure sensors are
needed.
PT4-07M for evaporators operating with refrigerants R22/R-124/R-134a/R-404A/R-407C
PT4-18M for evaporators operating with R-410A
PT4-30M for evaporators operating with R744
Every type of pressure sensor is calibrated in a temperature
range for the above specified applications. The feature set and
performance of the PT4 Series is a perfect match for the EC3X33. Other pressure sensors are not released for use with
EC3-X33 and when applied, may lead to poor performance.
Emerson temperature sensor ECN-N60
The temperature sensor measures the refrigerant temperature
at the outlet of the evaporator. It is important to use only this
particular temperature sensor because the ECN-N60 has the
right performance such as desired time constant and tolerance
compensation within the specific working range. The use of
other temperature sensors is not recommended. The sensor is
hermetically sealed for high reliability and long lifetime and has
metal housings for optimal thermal conductivity.
Optional ECD-002 display/keypad unit
The ECD-002 is required to set a parameter during start-up.
After completion of start-up, it may be left connected or
removed from EC3-X33.
The display unit can be switched from K/bar/°C to R/psig/°F.
Indicator LEDs show the status of valve opening, valve closing,
demand and alarm.
Blinking: Valve is opening
ON: Valve is fully open
Parameters setting/saving
Blinking: Valve is closing
ON: Valve is fully close
Next parameter/value (higher)
A: White wire B: Black wire C: Blue wire D: Brown wire
E: Plug cable assembly EX5-Nxx for connection to
EX4/EX5/EX6/EX7/EX8
F: Remote control panel, system controller
G: Alarm relay, dry contact. Relay coil is not energized at
alarm condition or power off
H: Digital input (0V/open = Stop; 24V/closed = Start)
I: Transformer Class II, 24VAC secondary / 28VA
J: Third party controller (can use the analog output signal from
EC3)
ON: Demand
OFF: No demand
Note: The internal resistor of a third party controller must fulfill the
following conditions:
Supply voltage 12VDC: R ≤ 200Ω
Supply voltage 24VDC: R ≤ 800Ω
ON: Alarm
OFF: No alarm
Next parameter/value (lower)
Manual reset for
blinking alarm codes
(press 5 sec together)
FC-TD/ EC3-X33
Selecting/confirming
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July 2008
EC3-X33
Stand-alone Superheat Controller
Ordering, main parts
Description
Controller EC3-X33
Terminal Kit for EC3-X33
Pressure Sensors
-11.6…101.5 psi
0…261.1 psi
0…435.1 psi
20 ft cable length
20 ft cable length
Cable Assembly for PT4
NTC Temperature sensors
Display/keypad unit (need for set-up only)
10 ft
Connection cable EC3 to ECD-002
Type
EC3-X33
K03-X32
PT4-07M
PT4-18M
PT4-30M
PT4-M60
ECN-N60
ECD-002
ECC-N30
Part Code Nr.
807 783
807 644
802 332
802 333
802 334
804 805
804 497
807 657
807 861
Ordering, accessories, spare part
Transformer
Emerson PCN
Primary:120/208/240VAC 60 Hz
097724
Secondary: 24V 40VA
Type
T2
Part Code Nr.
90-T40F3
Suitable valves for connection to EC3-X33
Valve
Capacity range
Tons *
EX4
EX5
EX6
EX7
EX8
0.6 … 5.7
1.4 … 14.2
3.4 … 34.1
10 … 93.8
25.6 … 250.2
EX4
EX5
EX6
EX7
EX8
0.6 … 6
1.4 … 15.1
3.7 … 35.8
10 … 98.7
28.4 … 263
EX4
EX5
EX6
EX7
EX8
0.6 … 4.3
1.1 … 11.1
2.8 … 26.4
7.1 … 72.5
19.9 … 193.4
EX4
EX5
EX6
EX7
EX8
0.6 … 4
1.1 … 10
2.6 … 23.9
6.8 … 65.4
17.6 …174.3
FC-TD/ EC3-X33
Valve
Capacity range
Tons*
R-22
EX4
EX5
EX6
EX7
EX8**
0.9 … 6.5
1.7 … 16.5
4 … 39.8
11.4 … 109.5
28.4 … 292
R-410A
R-407C
EX4
EX5
EX6
EX7
EX8**
1.1 … 11.7
2.8 … 29
7.1 … 69.4
19.9 … 190.8
51.2 … 508.7
R-744
0.3 … 3.1
0.9 … 8
1.7 … 19.1
R-124
Refrigerant
Capacity
regulation
10-100%
EX4
EX5
EX6
R-134a
*) Nominal rating conditions:
Refrigerant
R-22, R-134a, R-404A, R-407C,
R-410A
R-23
R-744
R-124
**) MWP: 508 psi
R-404A/
R-507
4/6
Refrigerant
Capacity
regulation
10 to 100%
Evaporating
Temperature
Condensing
Temperature
+39.2°F
+100.4°F
-76°F
-40°F
68°F
-13°F
14°F
176°F
July 2008
EC3-X33
Stand-alone Superheat Controller
Technical Data
EC3-X33
Supply voltage
Digital input
Power consumption
24VAC ±10%, 50/60Hz
24V AC ±10%, 50-60HZ
24V DC ±10%
25VA max. including connected ECV
and display/keyboard
Internal battery
Approximately 2 hours if battery is fully
charging time
empty
Plug-in connector size Removable screw version
wire size 12-20 AWG
Ground connection
Applied directive
EMC
LVD
RoHS
Marking
Protection class
Vibration
Temperatures
storage
operating
Humidity
Protection class
Weight
Mounting
1/4 in spade earth connector
EN 61326, EN 50081, EN 61000-6-2,
EN 61000-4-2, EN 61000-4-3, EN
61000-4-4, EN 61000-4-5, EN 610004-6, EN 61000-4-11
CE
IP 20
4g, 10-1000Hz
ECD-002 Display Unit
Supply
From EC3 Series Controller via
connecting cable
LED indicators
Valve opening, valve closing, alarm,
demand
Display LED
Connecting cable
Numeric segmental display, 2½digits, red, with automatic decimal
point betw. ±19.9, switchable between
°C and °F
ECC-Nxx or standard CAT5 patch
cord with RJ45 connectors
Temperature
storage
operating
Humidity
Protection class
-4 … +149°F
+32 … +140°F
0 … 80% r.h. non condensing
IP 65 (front protection with gasket)
Weight
Mounting
~ 1.8oz
Panel mount (2.8 x 1.1 in cutout)
-4 … +149°F
+32 … +140°F
0 … 80% r.h. non condensing
IP20
~28.2oz
DIN rail mounted
Input and Output, EC3-X33 Controller
Description
Temperature input
Pressure sensor input
Analog output (evaporating
pressure fed-through signal)
Digital input
Output relay
Stepper motor output
Connection to ECD-002
Specification
ECN-N60
10k @ +77 °F, Range: -58 … +122 °F
PT4-07M/18M
24VDC, 4 … 20mA
4 20mA
Requires 12 or 24 VDC
0/24 VAC/DC
SPDT contacts, AgCdO , 24VAC/DC
Inductive 2Amp, Resistive 8 Amp
For EX4 … EX8 Electrical Control Valves
RJ45
List of adjustable parameters
Superheat set point
Low superheat function
MOP function and set point
Type of refrigerant and required pressure sensor
Type of Electrical Control Valve
Valve start opening and duration
Unit conversion
Value to display
Battery error management
Password
FC-TD/ EC3-X33
5/6
July 2008
EC3-X33
Stand-alone Superheat Controller
Dimensions (in)
EC3-X33 Controller
ECD-002 Display Unit
Emerson 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 control we can not assume any liability for results obtained
or damages occurred due to improper application.
This document replaces all earlier versions.
www.emersonclimate.com/flowcontrols
11911 Adie Road P.O. Box 411400 St. Louis, MO 63141 USA
FC-TD/ EC3-X33
CUSTOMER SERVICE (314)-569-4666
6/6
July 2008
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