©2025 Copeland LP.
026-1803 R13 Supervisor I&O User Guide 9 - 60
9.42.4 Bypass Valve Control
Modular Chiller Control can utilize the Chilled and Condenser
Bypass Valves. These valves will be modulated to maintain
user defined differential setpoints. For each valve, as the
differential pressure rises above the setpoint, the valve will
modulate open. When the differential pressure falls below
setpoint, the valve will modulate closed.
9.43 XM Circuit Control
The XM Circuit Control application is an application that
provides supervisory control over the XM series of case
controllers. Although the XM case controllers can also be
controlled by the Case Control Circuit application in the
Supervisory Controller, specific configuration parameters in
the Case Control application apply and synchronize only with
CC-100, CS-100, and CCB case controllers. The XM Circuit
Control application is specifically designed to support XM
controllers and its parameters, and does not support other
types of case controllers.
The Supervisory Controller also supports sharing all XM temp
input alarms with the XM Circuit. Users can configure and
receive a temperature alarm in the XM Circuit.
This section of the manual covers both the programming of
an XM Circuit application and the process of
associating an XM670, XM678, or XM679 with an XM Circuit
application.
9.43.1 Associations
Case circuits that use XM670, XM678, or XM679 for case
control rely on the XM Circuit Control application in the
Supervisory Controller to provide them the necessary
setpoints, defrost scheduling, and other control parameters.
XM Circuits do not directly control temperature in the case
circuits; instead, the case controller controls temperature for
each individual case based on the setpoint(s) supplied to
them by their associated XM Circuit.
Setup of a case-controlled refrigerated case system is a two-
fold process:
1. For each case circuit in the refrigeration system, a
separate XM Circuit application is created with its own set
of control parameters.
2. Each XM670, XM678, and XM679 is associated with an
XM Circuit application in the
Supervisory Controller. Association creates a
network link between the case controller and the
application which supplies the information
necessary to control temperature, defrost, lights, fans,
and anti-sweat heaters.
Condenser Control, Case Control, XM Circuits or Suction
Groups with complex associations can be easily added under
the Control Programming Menu where a window with
additional association options will appear.
9.43.1.1 Case Circuit Association Support
The XM series of case controllers can be associated with
either an XM Circuit application or an existing Case Circuit
application. This allows users to upgrade the Supervisory
Controller firmware without the need of any re-programming
of XM controller associations. However, the Case Circuit
application provides a limited functionality for any XM
controller. For full circuit functionality, it is recommended that
the XM controllers be associated with the XM Circuit
application.
9.43.1.2 Dual Association Not Supported
Once an XM case controller is associated to a circuit (either
an XM Circuit or a Case Circuit), it can no longer be
associated with any other circuit.
For example, if an XM controller is associated with a Case
Circuit application, it will not be available in the XM
Circuit association screen. Once the Case Circuit
association is removed, the XM controller will then be
available on the XM Circuit association screen.
9.43.1.3 Synchronized Parameters
The following XM Circuit parameters are synchronized to any
associated XM case controllers:
The XM Circuit application does not use these parameters in
any internal logic within the circuit and the values of these
parameters are only synchronized with any associated XM
case controllers.
Table 9-24 - Synchronized parameters
Fan Mode Case Alarm LO
Defrost Type Case Alarm DLY
Pump Down Delay Case Alarm Prior
Defr Duration Case Alarm Cfg
Drip Time Case Alm Hi Type
Term Temp SP Case Alm Lo Type
Stand Alone Time DLY After Defrost
Case Alarm HI
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