Page 18 of 24
508296-G01 / 31-5000753
Issue 2231
Outdoor Unitary Control
Jumpers and Terminals
RAST TERMINALS FOR
THERMOSTAT WIRING
CONNECTION
CHARGE MODE AND
OPERATION MODE
JUMPER DETAIL
PUSH BUTTON
7 SEGMENT
DISPLAY
OPERATION
MODE
JUMPER
CHARGE
MODE JUMPER
(CHRG MODE)
Figure 12.
7-Segment Display and Push Button
Information labels concerning the outdoor control
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 NS23AMA 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.
NS23AMA Charge Mode Operation with a Conventional
24VAC Thermostat
On applications with a conventional 24VAC thermostat,
the charge mode jumper must be installed on the Charge
Mode Pins after providing a Y1 cooling demand to the
NS23AMA 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 thermostat. In
applications with a conventional 24VAC 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 installed on Pins 1 & 2), Normal Mode
(Jumper installed on Pins 2 & 3) and Comfort Mode (Jumper
Removed). The factory default position is the Efficiency
Mode. The Efficiency mode has a variable suction pressure
setpoint that will vary with the outdoor temperature; as
the outdoor temperature increases the suction pressure
setpoint will decrease. When the Operation Mode jumper
is installed in the “Normal Mode” the suction pressure
setpoint is 135 psig. When the Operation Mode jumper
is installed in the “Comfort Mode” the suction pressure
setpoint is 125 psig.
