MXS Service Manual

Indoor Unit SiUS121736EA
35 Printed Circuit Board Connector Wiring Diagram
Sensor PCB
(PCB1)
Service PCB
(PCB3)
Display/Signal
Receiver PCB
(PCB4)
 LED3 does not function.
Note: The symbols in the parenthesis are the names on the appropriate wiring diagram.
1) S49 Connector for control PCB (PCB2)
2) RTH2 (R1T) Room temperature thermistor
S49
RTH2
3P191450-1
1) S27 Connector for control PCB (PCB2)
2) SW2 (S2W)-4 Switch for upward airflow limit setting
∗ Refer to page 236 for details.
∗ Keep the other switches as factory setting.
3) SW4 (S4W) Switch for airflow selection
∗ Refer to page 53 for details.
S27
SW4
SW2-4
3P191448-1
1) S47 Connector for control PCB (PCB2)
2) SW1 (S1W) Indoor unit ON/OFF button
3) LED1 (H1P) LED for operation (green)
4) LED2 (H2P) LED for timer (yellow)
S47SW1LED2
LED1
3P191447-1