Hussmann CoreLink User manual

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CoreLink
™
MANUAL- CORELINK CASE CONTROLLER
Operation Manual
Application Version 151217
Defrost Sync Setup
Using Digital Input Override

Introduction
When cases in a lineup is required to have
defrost synchronization, multiple methods can
be applied in CoreLink to achieve
synchronization of defrost of the cases next to
each other.
Following are the available options in CoreLink
•Using Defrost Sync feature in CoreLink
•System Manager coordinating through
network commands
•An External component like Mechanical
timer to provide signal to CoreLink
This document covers the connectivity,
configuration and wiring detail to enable
external devices like mechanical time clock
providing signal to multiple cases in line up to
synchronize defrost among the cases.
Hardware Setup
CoreLink configuration is defaulted to defrost
initiate on Digital Input Pin 21.
Pin 22 is configured for defrost terminate.
To put cases into defrost in sync using a single
source, a 24V signal to pin 21 will enable the
case to eb in defrost.
The ground connection of the input signal
must be connected to pin 31 if using 24 VDC
power is used .
If using AC power is used, only connect the
24Vac signal to pin 21 of the CoreLink’s.
Software Configurations
No software configurations are required as
these defrost initiate and terminate are
defaulted on the CoreLink controller.
Application Configurations
CoreLink controller is completely factory
configured as per the Hussmann case model. This
includes on how the case is built according to the
customer specifications but also includes the
recommended factory settings for refrigeration,
valves, defrost etc.
Factory Defrost in the controller is configured to
be on an interval defrost.
If the external source initiates a defrost, controller
will wait till the next interval and if there is no
initiation from external signal, then case goes into
defrost on its own.
When initiated from an external source, controller
terminates the defrost depending on termination
configuration per case model.
Defrost Termination can also be overridden.
Best practice is to initiate the defrost using
external source and cases terminate the defrost
on its own.
Configuration of External Timer
External Timer initiating defrost should be
configured per the case model specification. If it is
not configured same as case model spec or if it is
different from CoreLink interval configuration,
there is a potential to run double defrosts on the
cases.
Ex: For a Hussmann D6NX case, defrost spec is to
have defrost every 6 hours. CoreLink is already
configured to defrost every 6 hours. If the External
timer is programmed to more than 6 hours, say 8
hours, CoreLink initiates a defrost at 6 hour
timelapse and external timer could initiate at 8
hours. CoreLink interval resets after every defrost
execution on interval mode.
To avoid any defrost lapses, it is recommended to
have external source to be at exact same time or
little less than the case specified defrost interval.

Digital Input PIN configurations on CoreLink
Defrost Initiate sync using External signal –Wiring diagram