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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 NS22HM 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.
NS22HM Charge Mode Operation with a Conventional
24VAC Heat Pump Thermostat
Charge Mode Display String
When unit is in the charge mode, Suction Pressure
(SPxxx), Suction Temp (Stxx.x), Superheat (SHxx.x), Liquid
Pressure (LPxxx), Liquid Temp (Ltxx.x) and Subcooling
(SCxx.x) will be scrolled on the 7-segment display.
Page 18 of 26
PUSH BUTTON
Figure 11.
the
outdoor
control
Issue 2250
7 SEGMENT
DISPLAY
CHARGE
MODE JUMPER
(CHRG MODE)
OPERATION
MODE
JUMPER
Example:
S P 1 3 5 pause S t 6 2 pause S H 1 5 pause L P 3 4 5
pause L t 9 6 pause S C 1 0 repeat
Charge Mode Jumper Operation in the Cooling Mode
On applications with a conventional 24VAC heat pump
thermostat, the charge mode jumper must be installed
on the Charge Mode Pins after providing a cooling
compressor demand to the NS22HM and an "O" cooling
reversing valve demand to initiate the Charge Mode. A
cooling blower demand must also be provided to initiate
blower in high stage operation on the indoor unit.
The compressor and outdoor fan motor will begin to ramp
up and reach 100% design capacity within 3 minutes. They
will continue to operate at 100% design capacity for the
duration of charge mode.
Charge Mode Jumper Operation in the Heat Pump
Heating Mode
On applications with a conventional 24VAC heat pump
thermostat, the charge mode jumper must be installed on
the Charge Mode Pins after providing a heating compressor
demand to the NS22HM without an "O" reversing valve
signal to initiate the Charge Mode. A heating blower
demand must also be provided to initiate high speed
blower operation on the indoor unit.
CHARGE MODE AND
OPERATION MODE
JUMPER DETAIL
508311G01 / 31-5000754
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