LG PATX20A0E Installation Manual page 13

[COMMUNICATION PCB CONFIGURATION]
Thermistor #B OUT
Rotary switch #B
10. Distinguish and connect the IN and OUT on the Thermistor terminal on the
communication PCB inside AHU CONTROL KIT.
11. Check the rotary switch number and write the installation confirmation plate of
EXPANSION KIT.
The error number displayed on AHU Controller in case of an error is displayed
for the rotary switch number, and error on Outdoor unit can be easily
estimated during the service.
CAUTION
n 2 EXPANSION KIT and Outdoor unit are connected to one communication PCB,
and each is classified and connected.
Ex) EXPANSION KIT A, Outdoor unit A, outdoor communication line A, thermistor
A IN, thermistor A OUT
' All connected to A circuit
EXPANSION KIT B, Outdoor unit B, outdoor communication line B, thermistor
B IN, thermistor B OUT
' All connected to B circuit
Thermistor #B IN
Thermistor #A OUT
Outdoor unit communication line #B
Outdoor unit communication line #A
EXPANSION KIT Installation
Thermistor #A IN
Rotary switch #A
Installation
confirmation plate
Installation Manual 13