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Load Shedding
E E x x t t e e r r n n a a l l S S h h u u t t d d o o w w n n
External Shutdown is used for Load Shedding and
applies to both heating and cooling modes of
operation.
When applied, External Shutdown will allow for an
operation to be interrupted when triggered by an
external control device. Typical examples of external
control devices are smart-home, home automation
services, utility load shed/grid management, event/time
of day pricing entities. While communicating devices
and methodology of application are the responsibility
of the provider, connection points with explanations of
internal logic and trigger requirements are provided in
this Technical Manual.
Enabling External Shutdown is accomplished at the
Outdoor Unit via the Communicating Display Assembly
(CDA) Technician Configuration Menu along with field
supplied wiring and ¼ stake-on hardware connections
at the LOAD SHED terminals. CDA options available are
INACTIVE where the External Switch input is ignored
and compressor operation is always enabled where the
External Switch input is ACTIVE-SENSED. Open
contacts will disable compressor operation and closed
* B to Common Pigtail
* R Pigtaili for 24 VAC input
* D to Data Pigtail
32
Logic Device
R1
Control Signal
contacts will enable compressor operation. The Factory
Default configuration is INACTIVE.
Upon enabling this feature, the 850/950/1050 will
provide notification when this feature is ACTIVE. The
installer will need to apply 24VAC to the R pigtail, then
route the 24VAC from the Load Shed terminal for
normal, uninterrupted compressor operation. When
the externally applied contacts change position to
Open, the outdoor control interprets this as Demand
Response or Load Shed and sends a message to the
850/950/1050 to disable compressor operation. The
ODU will not be allowed to operate until contacts close
and 24VAC is again sensed at the ODU Load Shed
contact. If the unit is already running and the external
contacts open, the ODU will begin a shutdown routine
and operations will be interrupted for as long as the
contacts remain open. When Load Shed is active (open
contacts), the 850/950/1050 will provide a text display
of Load Shed Active.
N N o o t t e e : : See Communication Display Assembly (CDA)
instructions for External Switch found in the
Configuration Menu.
4TWL9048A-SF-1C-EN
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