Page 28
XP25
.
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 nor
mal. Communication signals will switch
between this 5V and common (Pin 2).
P6 - Pin 2
Inverter
Com
mon
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 supply.
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 supply.
N/A
N/A
N/A
COIL
Outdoor coil temperature sensor return.
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 39.)
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
ener
gizes load shedding fea
ture.
N/A
N/A
C
Load shedding input reference. Refer to wir
ing of load shedding terminals in the
Unit Wir
ing Diagram
section of this manual on page
46.
N/A
N/A
24VAC com
mon
