28
XC25
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 44.
N/A N/A
24VAC
common
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