Alco Controls - Grobelny

A2.5. /0604/E
EC2 Series
The compact EC2 series is available with either TCP/IP
or LON communication protocols and covers many
applications including:
Display Case and Coldroom Controllers
The EC2-200 series of controllers are specifically
designed for display cases for use with TXV. The
controller performs the function of Thermostat,
defrost and fan management and is capable of
operating a standalone condensing unit or being
incorporated into a distributed system controlled
by a rack.
The EC2-300 series of controllers incorporate the
functionality of the EC2-200 model but additionally
has a superheat algorithm to control the EX2
electrical control valve.
The EC2-300 series are available in two versions:
Model EC2-31x Temp / Temp: the superheat is
controlled using two temperature sensors.
Model EC2-35x Pressure / Temp: the superheat is
controlled using a pressure transmitter (PT4 series)
in conjunction with a temperature sensor.
Whilst the products were developed for display
cases, they may also be applied to control a simple
coldroom.
Condensing Unit Controllers
The EC2-500 series of controllers are suitable for
controlling the compressors and fans of a condensing
unit. Digital inputs are available for individual
compressor feedback loops from the safety chain,
which typically consists of low and high pressure
switches together with motor protection and oil
management controls. A common feedback is also
available for the fans.
PT4 series pressure transmitters are used to measure
the suction and discharge pressures to modulate the
compressor and fan capacities.
Three models are available:
EC2-512: to control up to 2 compressors (on/off
control) and 2 fans (on/off control)
EC2-542: to control up to 2 compressors; on/off
control and a 0... 0V output which can be used in
conjunction with the FSP series of fan speed control
modules for variable fan speed control.
Condenser Controllers
The EC2-700 series provide an economical solution
for condenser control and may be used in conjunction
with the EC3-600 Rack Controller or EC3-800 Dual
Rack Controller series to form complete compressor
and fan modulation. A PT4 series pressure transmitter
should be used to measure the discharge pressure for
fan modulation.
EC2-71x: to control up to 4 fans; on/off. A feedback
loop is available for each fan.
EC2-74x: provides a 0... 0V output to feed FSP series
fan speed control modules. Several FSP modules
may be connected in parallel to speed control all
fans simultaneously.
EC3 series
The EC3 series utilize in principle the same software
technology of the EC2 series but provide additional
inputs and outputs to satisfy the requirements of
even the most demanding systems. Like the EC2,
the EC3 series may be connected together to form
larger systems combining the control of multiple
compressors and fans. Many controllers include
0... 0V outputs that may be used in conjunction
with frequency inverters and/or the FSP series of fan
speed control modules.
Coldroom Controllers
Commonly referred to as “cold application
controllers”, the EC3-300 series are specifically
for use with ECV stepper valve series (EX4, EX5,
EX6, EX7, EX8). As explained above, each valve
requires a battery backup. For this reason, the
battery together with its automatic charging circuit
has been incorporated into the controller housing
significantly saving installation time as well as space
in the electrical enclosure.
The optional ECD-001 Display Module is available
to display the system temperatures, indicate system
status and to modify parameters.
Rack and Condenser Controllers
Commonlyreferredtoas“hotapplicationcontrollers”,
the EC3-600, -700, -800 & -900 series controllers
are designed for the control of compressors and
condensers. Racks with one or two suction groups
and up to 8 compressors can be managed. The
control of condenser arrays with up to 7 fan stages
as well as a combined control of Rack and Condenser
is also possible. Refer to the table on page 7 for a
complete product listing.
The optional ECD-000 Display Module is available
to display the system temperatures, indicate system
status and to modify parameters.
The Universal series of Controllers
are useful additions to the series. They are typically
used to enable the monitoring of temperatures
from integral display cases that do not have
communication facilities as well as potentially
providing additional input and output functionality
to control systems. Example of such applications
could be for switching display case lighting or for
the monitoring of individual pressure switches on
multiple compressor Racks.
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