Alco Controls
Alco Controls
Alco Controls
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EC2 Series<br />
The compact EC2 series is available with either TCP/IP<br />
or LON communication protocols and covers many<br />
applications including:<br />
Display Case and Coldroom Controllers<br />
The EC2 series has been extended to cover applications<br />
where the display cases are connected to a multiple<br />
compressor application. In this case, the dedicated<br />
compressor relay on the controller is no longer<br />
required and is available as a spare relay to perhaps<br />
switch the display case lighting.<br />
The controllers can therefore be split into two groups;<br />
controller is required to switch the compressor<br />
directly; integral application and those connected<br />
to a multiple compressor (rack) system.<br />
The EC2-21x, EC2-31x and EC2-35x have the<br />
dedicated compressor relay<br />
The EC2-29x, EC2-39x and EC2-37x are for use with<br />
the rack system.<br />
The EC2-200 series of controllers are specifically<br />
designed for display cases for use with TXV. The<br />
controller performs the function of Thermostat,<br />
defrost and fan management and is capable of<br />
operating a standalone condensing unit or being<br />
incorporated into a distributed system controlled<br />
by a rack.<br />
The EC2-300 series of controllers incorporate the<br />
functionality of the EC2-200 model but additionally<br />
has a superheat algorithm to control the EX2<br />
electrical control valve.<br />
The EC2-300 series are available in two versions:<br />
EC2-31x / EC2-39x Temp / Temp: the superheat is<br />
controlled using two temperature sensors.<br />
EC2-35x / EC2-37x Pressure / Temp: the superheat is<br />
controlled using a pressure transmitter (PT4 series)<br />
in conjunction with a temperature sensor.<br />
Whilst the products were developed for display<br />
cases, they may also be applied to control a simple<br />
coldroom.<br />
Condensing Unit Controllers<br />
The EC2-500 series of controllers are suitable for<br />
controlling the compressors and fans of a condensing<br />
unit. Digital inputs are available for individual<br />
compressor feedback loops from the safety chain,<br />
which typically consists of low and high pressure<br />
switches together with motor protection and oil<br />
management controls. A common feedback is also<br />
available for the fans.<br />
PT4 series pressure transmitters are used to measure<br />
the suction and discharge pressures to modulate the<br />
compressor and fan capacities.<br />
Three models are available:<br />
EC2-512: to control up to 2 compressors (on/off<br />
control) and 2 fans (on/off control)<br />
EC2-542: to control up to 2 compressors; on/off<br />
control and a 0...10V output which can be used in<br />
conjunction with the FSP series of fan speed power<br />
modules for variable fan speed control.<br />
EC2-552: to control single compressor or tandem<br />
compressor condensing units with a Copeland Digital<br />
Scroll compressor. It features a 0…10V output to<br />
connect to an <strong>Alco</strong> <strong>Controls</strong> FSP fan speed power<br />
module for variable fan speed control. Alternatively<br />
this output may be used to control fan motor speed<br />
with an inverter or to connect to ECM type fan motors<br />
directly.<br />
Condenser Controllers<br />
The EC2-700 series provide an economical solution<br />
for condenser control.<br />
Two models are available:<br />
EC2-71x: to control up to 4 fans, on/off. A feedback<br />
loop is available for each fan.<br />
EC2-74x: provides a 0...10V output to feed FSP series<br />
fan speed power modules. Several FSP modules<br />
may be connected in parallel to speed control all<br />
fans simultaneously.<br />
32 A2.5.1/0706/E
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