Circuit Board Diagrams; Circuit Board Diagrams And Check Points; Control Circuit Board - Mitsubishi Electric LGH-F300RVX-E Handbook

6. Circuit board diagrams

Circuit board diagrams and check points

( 1 ) Control circuit board

Malfunction monitor output
(Between [8] and [10] )
Error: 0 Ω
∞
Normal: Ω
Operation monitor output
(Between [9] and [10] )
When Lossnay is operating: 0 Ω
∞
When Lossnay is stopped: Ω
Monitor output
COM
Remote controller
(PZ-61DR-E)
10 to 13 V DC
M-NET transmission
cable (Power supply
unit, etc.)
M-NET transmission
cable (Shielded)
5 V DC (Insulated)
Power for the circuit
External control input
Power circuit
board (upper)
Only for LGH-F1200RVX-E
12 to 14 V DC
(Insulated)
Power circuit board
GND
(Insulated)
Return air (RA)
thermistor
Bypass monitor output
Pre-heater output
(Between [7] and [10] )
During bypass mode or
when the pre-heater is operating: 0 Ω
During energy recovery mode or
when the pre-heater is stopped:
Outdoor air (OA)
Power supply indicator
thermistor
for the circuit
(LED4 Red)
Fed with power: lit
Not fed with power: unlit
Remote controller
power supply indicator
(LED3 Green)
∞
Ω
Circuit board name
10s digit 1s digit
SA1 SA2
Address setting Model selection
switch
─ 10 ─
Fed with power: lit
Not fed with power: unlit
Lot number indication
SW6
switch
M-NET indicator
(LED2 Red)
Registered: unlit
Not registered: lit
M-NET communication error: blinking
Indication of the
microcomputer
software No.
Function selection
switch
SW2
SW5
SW7
Error indicator
(LED1 Green)
Normal: unlit
Error: blinking
During delay operation: lit