Mitsubishi Electric LGH-50RSDC-E1 Handbook page 9

(2) Small PCB (right)
Transformer output
11 V to 20 V AC
12 V DC
(CN14) (IC6)
SW1
Communication
signal between
the circuit boards.
(CN15)
Thermistor
(return air, outside air)
(CN16)
GND 5 V DC
(C20) (C20)
Damper position detector
(CN17)
during energy recovery ventilation: 12 V DC
during bypass ventilation: 0 V
LED 1 (red)
Normal: lit
During an error: blinking
SW2
─ 9 ─
LED 11 (green)
During trial operation: lit
During an error: blinking
During an error: 0 Ω
Normal: Open
(TM4 10, 11)
During operation: 0 Ω
When stopped: Open
(TM4 8, 9)
Ventilation priority
mode selection
(TM3 V)
Power bypass
condition selection
(TM3 PB)
Fan speed selection
(TM2 1 to 4, TM3 5)