Copeland E3 - Control Link Anti-Condensate Controller (CL ACC); Alarm Handling Logic; Alarms Configuration; HVAC Zone

©2025 Copeland LP.
026-1803 R13 Supervisor I&O User Guide 9 - 44
The MRLDS-450 refrigerant gas detector is designed for use
in refrigeration applications and with the integrated audio-
visual alarm indication, can be operated as a stand-alone unit
(with additional local alarm signaling as required), or it may be
connected to a facility’s building management system (BMS).
For more information on the MRLDS-450, refer to the
MRLDS450 user manual (P/N 026- 1316).
9.31 Control Link Anti-Condensate
Controller (CL ACC)
CL ACC can be added, deleted, and commissioned, can take
actions on alarm instances, and support data handling.
The Serial Connection Manager can create the MODBUS
Master process based on the settings in System Settings. If no
MODBUS connections are defined, no MODBUS processes
can be created. Also, if a connection is changed, the previous
connection will stop, and the new connection is created. In
the case of MODBUS, Serial Connection Manager will stop
the associated MODBUS process.
9.31.1 Alarm Handling Logic
If any alarm condition exists, the General Alarm Output is set
to ON. The individual alarm outputs is set according to which
is alarm is present. If the condition clears, the alarm is reset
automatically.
9.31.2 Alarms Configuration
The alarms can be individually set to their advisory type
(Notice, Non-Critical, Critical), Category, Display Message,
Repeat Rate, and Monitoring. (The device will generate the
alarm and does not have any way to externally disable it).
9.32 HVAC Zone
An HVAC Zone is a collection of up to sixteen rooftop units or
air handling units that work together to maintain the same
temperature and humidity throughout a particular volume of
space. The primary function of an HVAC Zone is to “manage”
the operation of each individual HVAC unit by providing the
temperature setpoints that will be used in Temperature
Control. Zones are also responsible for ordering HVAC units
to dehumidify and determining when outside air conditions
are favorable to economize.
HVAC Zones can be edited, deleted, and associated with
other applications and devices and copy built-in properties of
an instance of an HVAC Zone.
9.32.1 How It Works
An HVAC Zone is built by creating an HVAC Zone application
in the Supervisory Controller device. All HVAC unit
applications that are part of the HVAC Zone must be
connected with the HVAC Zone application. This connection
process is known as “association.”
When a rooftop unit or AHU is associated with an HVAC Zone,
the Supervisory Controller automatically makes a series of I/O
connections between the HVAC Zone application and the
individual MultiFlex RTU or AHU application. From that point,
the HVAC Zone is responsible for passing the following
information to the individual unit:
• The heating and cooling setpoints that the unit will use
during occupied and unoccupied building times.
• A command to operate in either occupied or unoccupied
mode (based on the HVAC Zone application’s own time
schedule input).
• Outdoor air and outdoor relative humidity values.
• A signal to enable or disable economization (based on
the Zone application’s own economization checking
method).
• A signal to begin or end dehumidification (based on the
Zone application’s own humidity reading and
dehumidification setpoint).
• A signal indicating the current season is either SUMMER
or WINTER.
• The combined HVAC Zone Temperature and HVAC Zone
humidity (based on a combination of each HVAC unit’s
space temperature and space humidity).
• The fallback temperature and humidity setpoints to use
in case the unit loses contact with its HVAC Zone
application.
9.32.2 Compatible Applications to be
Connected to HVAC Zones
There are three different HVAC applications that may be
associated with an HVAC Zone application:
• a MultiFlex RTU application
• a MultiFlex RCB application
• an AHU application
The MultiFlex RTU and RCB applications interface with the
MultiFlex RTU and RCB I/O Network boards that control
rooftop units. AHU applications use input and output points
on the I/O Network to control air handling units.