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Outdoor Unitary Control
Jumpers and Terminals
RAST TERMINALS FOR
THERMOSTAT WIRING
CONNECTION
7-Segment Display and Push Button
Information
labels
concerning
7-segment display and push button operations are
available on the unit control panel cover.
Alarms
Alarm information is provided on the unit control panel
cover.
Charge Mode Jumper
To initiate the 4SCU23LX Charge Mode function, install
the jumper across the two Charge Mode Pins (CHRG
MODE) on the outdoor control. The Charge Mode can be
used when charging the system with refrigerant, checking
the refrigerant charge, pumping down the system and
performing other service procedures that requires outdoor
unit operation at 100% capacity.
4SCU23LX Charge Mode Operation with an A3
Communicating Thermostat
Installing a jumper on the Charge Mode Pins will initiate
compressor operation and outdoor fan motor at 100%
capacity and will provide a signal to the indoor unit to
initiate indoor blower operation at the maximum cooling
air volume. To exit the charge mode, remove the Charge
Mode Jumper. The Charge Mode has a maximum time of
508296-01
PUSH BUTTON
Figure 13.
the
outdoor
control
Issue 2231
7 SEGMENT
DISPLAY
CHARGE
MODE JUMPER
(CHRG MODE)
OPERATION
MODE
JUMPER
60 minutes and will automatically exit the charge mode
after 60 minutes is the charge mode jumper is left in place.
4SCU23LX Charge Mode Operation with a Conventional
24VAC Non-Communicating Thermostat
On applications with a conventional 24VAC non-
communicating thermostat, the charge mode jumper must
be installed on the Charge Mode Pins after providing a Y1
cooling demand to the 4SCU23LX to initiate the Charge
Mode. A cooling blower demand must also be provided to
initiate blower operation on the cooling speed on the indoor
unit. The compressor and outdoor fan motor will operate
at 100% capacity. To exit the charging mode, remove the
Charge Mode Jumper and remove the Y1 Cooling demand
and indoor blower demand. The Charge Mode has a
maximum time of 60 minutes and will automatically exit the
charge mode after 60 minutes is the charge mode jumper
is left in place.
Operation Mode Jumper
The Operation Mode Jumper is only used on applications
installed with a conventional 24VAC Non-communicating
thermostat. In applications with a conventional 24VAC
non-communicating thermostat, the compressor capacity
is controlled to maintain the target suction pressure
setpoint. The Operation Mode Jumper has three selectable
cooling modes. The three modes are Efficiency (Jumper
CHARGE MODE AND
OPERATION MODE
JUMPER DETAIL
Page 19 of 25
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