2. Processes and functions
2-5 Outdoor Unit Control PCB
(1) Layout Diagram (CR-CH4872R)
Heat exchanger temperature (C1) sensor Heat exchanger temperature (C2) sensor
MDC
EEPROM IC
Power LED (D115)
Suction temperature (TS) sensor
Outdoor air temperature (TO) sensor
Compressor discharge temperature (TD) sensor
Refrigerant recovery switch (S005)
Quiet mode plug (CN028)
Refrigerant System address switch (S002)
EXCT plug (CN026) Automatic address setting switch (S001)
Snowfall sensor
Refrigerant System address switch (S003)
Cooling test
Test pin (CN036)
Operation circuit fuse (F002)
LED 1, 2
Serial 1 plug
Terminal plug (CN015)
Serial 2 plug
If the operation circuit fuse (F002) has blown, determine and correct the cause for the blown fuse, then change the socket from the serial 1 plug to the serial 2 plug.
Position detection plug (CN003)
2
Fan motor plug (CN004)
SM831148
