Trane Technologies ComfortLink II 4TTV0024A1000C, Сервисные данные, Страница: 40 / 72

40 4T-V0-SF-1Q-EN
Load Shedding
E Ex xtte errn na all S Sh hu uttd do ow wn 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 T3 & T4 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 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 T3 to a
set of Normally Closed (N.C.) contacts and back to Load
Shed terminal T4 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 T4. 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.
FAN
LSOV
EEV
LOAD SHED
CDA
EXT.ODT
STATUS
COMM
T4
T1 T2
T5 T6
HPCO
DATA
CHARGE
SOLENOID
J1
J6
J4
D R B
T3
J8
J2
0
J9
J3
J1
0
J2 J5
PSC
PWM
ALUMINUM COVER PLATE
• B to Common Pigtail
• R Pigtail for 24VAC input
• D to Data Pigtail
Note: 24VAC input only required for
Field Connections
Trace on PCB connects R to T3
Field Supplied Connections and Control
Logic Device
Control Signal
R1
Integrated Variable
Speed Control (IVSC)
Demand Response
N No otte e:: See Communication Display Assembly (CDA)
instructions for External Switch found in the
Configuration Menu.