Condensing Unit Controller EC2-5X1
2.3
EC2-551 Condensing Unit Controller
The Condensing unit controller EC2-551 is fitted as standard on:
Copeland EazyCool™ condensing units with Copeland Digital Scroll™
compressors
Copeland EazyCool™ condensing units with two compressors and equipped with
fan speed controller module Alco Controls FSP150 (optional).
Copeland EazyCool™ condensing units for refrigeration networks
The condensing unit may have up to two compressors (of which one can be a Copeland
Digital Scroll compressor) and 2 fans. Both fans can be fan speed controlled using a FSP
150 module (optional or fitted as standard, depending on the condensing unit model),
using the analogue output of the EC2-551.
In fact there are two controllers present in the EC2-551 controller:
one for controlling the compressor capacity, and
one for controlling the condenser pressure.
The control target of the
compressor controller
is to maintain the suction pressure at a
defined value by varying the available compressor capacity.
The control target for the
condenser controller
is to maintain the condensing pressure at
a defined value by varying the fan speed.
For the
measurement
of the
suction pressure
and the
condensing pressure
, two Alco
Controls PT4 pressure sensors with 4~20 mA interface can be connected to the
controller.
The controller has:
relay outputs to switch the compressors
a 0-10V output to control the fan speed
1 Triac for modulation of the Copeland Digital Scroll compressor
3 digital inputs for Volt-free input contacts are available:
o
2 for compressor serial alarm,
o
1 for fan serial alarm.
6
Part no: 3125495
C6.1.3/0505-0705/E
