©2025 Copeland LP.
026-1803 R13 Supervisor I&O User Guide 9 - 55
Demand Fail-Safe Time
To protect against demand defrost sensors that may not be
working properly, a demand fail-safe time may be set up.
Demand fail-safe times limit the amount of time a defrost
inhibit may last. If a demand defrost sensor does not detect
frost for an amount of time equal to the Demand Fail-Safe
Time, the defrost inhibit is lifted and the circuit will enter
defrost at the next scheduled time.
9.38.4.5 Emergency Defrost
When necessary, a user can initiate an emergency defrost
cycle from a circuit. Emergency defrost cycles are similar to
normal defrost cycles, except an emergency defrost cycle will
ignore all calls for termination and remain in defrost for the
entire programmed defrost time.
• Emergency defrosts are initiated by the user.
• The WAIT State
When a Case Control Circuit application enters defrost mode,
it sends a message out to all case controllers in the circuit to
begin defrost at the same time. However, since each case in a
circuit will have its own termination sensors, it is possible for
some cases to terminate defrost while defrosts in other cases
continue.
When a case controller terminates defrost, it enters a state of
operation called “the WAIT state.” While in the WAIT state, all
refrigeration and defrost heat will remain OFF. When the Case
Control Circuit application detects that all case controllers
have entered the WAIT state, the application will consider the
defrost cycle completed, and refrigeration will restart.
9.38.4.6 Defrost Schedule Summaries
The Defrost Schedule Summary allows users to view all
scheduled defrosts on one screen and identify possible
overlaps before potential performance issues could be
caused in the system. When a case circuit is added and a
case type is selected, a defrost schedule will be assigned for
that circuit based on the case type. When another case circuit
and case type are added, another defrost schedule is added
based on the case type. Staggering defrost intervals are
automatically started for the second circuit after the first
circuit schedule starts in order to reduce peak consumption
of energy and balance refrigeration and electrical load.
9.39 Irrigation Control
Irrigation control is an application used for the controlling of
sprinkler systems. This application controls watering by
duration of time or water usage parameters. Days of the week
and times for watering are set by the user with a maximum of
two Irrigation applications allowed in the CX controller.
The master water valve is turned ON and OFF as water is
needed for a zone. When disabled, no application control of
any outputs will be possible and the System Status output will
indicate Disabled.
Under normal control only one zone will be active at a time.
How To Add a Irrigation Control Device on the Supervisor:
1. From the Home screen, click the Control Inventory icon
(box). Click the drop-down arrow for Add Control in the
appropriate category and select from the list.
2. Select the Control or Application Type - Irrigation
Control, enter the Quantity, Control Name and Serial
Type. Note that Serial Type information can be enter
later. Click Save to add the application.
3. A Confirmation box will appear saying that the
application is successfully added to the system, click
Close or Edit these controls.
4. The system will display the new application(s) on the Site
Summary screen.
5. Click the Irrigation Control application panel box to view
the application.
6. The system will display the Irrigation Control application
parameters.
7. The user can view and configure the properties of the
application by setting the Edit Mode to ON on the screen
drop-down arrow on the upper right of the screen.
Table 9-23- Irrigation Control Advisories
Application Advisories Heating
Flow obstructed Non-critical
Leak detected Non-critical
Inhibit Sensor Failed Non-critical
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