Lennox XP25-024-230-01 Installation And Service Procedure page 28

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
Transmit data to inverter, connects to Rx of
P6 - Pin 1 Tx
inverter.
Inverter common
Inverter
NOTE - This is a signal reference point and not
P6 - Pin 2 Com­
mon
an earth ground
Receive data from the inverter. Connects to
P6 - Pin 3 Rx
Tx of inverter.
P6 - Pin 4 Inv 5V Inverter 5VDC volts.
LIQ Liquid line temperature sensor supply.
LIQ Liquid line temperature sensor return.
AMB Outdoor ambient temperature sensor supply.
AMB Outdoor ambient temperature sensor return.
COIL Outdoor coil temperature sensor supply.
COIL Outdoor coil temperature sensor return.
To initiate pump down function, place jumper
in the ON position. (See Pump Down Mode
Operation on Page 39.)
1.
2.
Pump Down
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
shutdown sequence.
L Load shedding input.
Load shedding input reference. Refer to wir­
ing of load shedding terminals in the Unit Wir­
C
ing Diagram section of this manual on page
46.
.
Place the jumper in the ON position to
activate pump down mode.
Place the jumper in the OFF position to
deactivate pump down mode.
control initiates a compressor
Input
Outdoor control
communication transmit
pin.
Inverter common.
Outdoor control
communication receive
pin.
Inverter 5VDC volts
N/A
N/A
N/A
N/A
N/A
N/A
PUMP
DOWN
24VAC input to L ener­
gizes load shedding fea­
ture.
N/A
Page 28
Output Common
• 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).
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
ON
ON
OFF
OFF
PUMP
DOWN
N/A N/A
24VAC com­
N/A
mon
XP25