28
XC20
Table 5 continued.
Outdoor Control Terminal Designations and Input /Outputs
WARNING - Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and
local codes. The 4 pins in P6 have the potential of transferring up to 250 volts to the unit cabinet ground.
Designator Description Input Output Common
P6 - Pin 1 Tx
Transmit data to inverter, connects to
Rx of inverter.
Outdoor control
communication
transmit pin.
• Pin 1 to pin 2 should read 4.5 to 5.5
VDC when not communicating.
• Pin 3 to pin 2 should read 4.5 to 5.5
VDC when not communicating.
• Pin 4 to pin 2 should read 4.5 to 5.5
VDC.
NOTE - Communication signals switch off
and on rapidly. This may cause volt meter
readings to fluctuate. This is normal.
Communication signals will switch
between this 5V and common (Pin 2).
P6 - Pin 2
Inverter
Common
Inverter common
NOTE - This is a signal reference point
and not an earth ground.
Inverter common.
P6 - Pin 3 Rx
Receive data from the inverter.
Connects to Tx of inverter.
Outdoor control
communication
receive pin.
P6 - Pin 4 Inv 5V Inverter 5VDC volts. Inverter 5VDC volts
LIQ
Liquid line temperature sensor sup
ply.
N/A N/A N/A
LIQ Liquid line temperature sensor return. N/A N/A N/A
AMB
Outdoor ambient temperature sensor
supply.
N/A N/A N/A
AMB
Outdoor ambient temperature sensor
return.
N/A N/A N/A
COIL
Outdoor coil temperature sensor sup
ply.
N/A N/A N/A
COIL
Outdoor coil temperature sensor re
turn.
N/A N/A N/A
Pump Down
To initiate pump-down function, place jumper in
the ON position. (See PUMP-DOWN MODE
OPERATION on page 37.)
1. Place the jumper in the ON position to
activate pump-down mode.
2. Place the jumper in the OFF position to
deactivate pump-down mode.
NOTE -If the pump-down jumper is in the ON
position during power-up, it is ignored.
NOTE - The outdoor control stays in pump-down
mode for five minutes, after which the outdoor
control initiates a compressor shutdown
sequence.
PUMP
DOWN
PUMP
DOWN
ON
OFF
ON
OFF
L Load-shedding input
24VAC input to L en
ergizes load shed
ding feature.
N/A N/A
C
Load-shedding input reference. Refer
to wiring of load-shedding terminals
located on page 47.
N/A N/A
24VAC
common
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