Basic Circuit Diagram - Mitsubishi LGH-15RX5-E Handbook

5. Basic circuit diagram

G Circuit board diagram and check points
* Fan drive output voltage: Each 220 to 240 V AC
EA fan drive
(CN9)
Extra
High High Low
5 V DC
(C6)
LED 1 (Green)
• Normal : unlit
• During
an error: blinking
For damper
motor drive
(CN7)
220 to
240 V AC
Damper motor
position detection
(CN6) *1
During Lossnay
ventilation: 12 V DC
During Bypass
ventilation: 0 V
Thermistor
(RA) (OA)
(CN5)
LED 4 (Red)
Energized: Lit
•
Not
•
energized: OFF
LED 2 (Red)
When blinking, an M-
NET communication
error is generated.
(The number of
blinks indicates the
details of the error)
This will be lit
steadily when there
is no (registered)
connection to another
M-NET device.
*1: Damper position detection input is only for the LGH-15 to 100 types, and not for the LGH-150 and 200 types.
SA fan drive
(CN10)
Extra
High High Low
When SW5-6 is OFF
During normal
Ω
ventilation: 0
During heat exchange
Ω
ventilation: ∞
When SW5-6 is ON
During operation
and when the outdoor air
temperature is ≤ -5ºC to
Ω
15ºC: 0
While stopped,
or when the outdoor air
Ω
temperature is ≥ 15ºC: ∞
(TM3 6,7)
Common for SA
fan drive
(TAB5)
Common for EA
fan drive
(TAB3)
During an
Ω
error : 0
Ω
Normal: ∞
(TM3 7,8)
For external
device connections
(TM2)
M-NET transmission cable
(PZ-52SF-E, M-NET
controller, power supply
unit, and City Multi
indoor unit)
(TB5 A,B)
— 21 —
Power supply
220 to 240 V AC
(TAB1, TAB2)
M-NET transmission
cable (Shielded)
(TB5 S)
Lossnay remote controller
(PZ-60DR-E, PZ-41SLB-E)
and transmission cable
between Lossnay units
(TM4 1, 2)
10 to 15V DC
Transformer
primary (input)
(CN1)
220 to 240 V AC
GND
(C5)
Fuse
(5 A/250 V)
15 V DC
(C3,C8)
12 V DC
(C4,C5)
During
Ω
operation: 0
When
Ω
stopped: ∞
(TM4 9,10)
Transformer
secondary
(output)
(CN2)
11 to 20 V AC