Service Manual

─ 12 ─
(2) Power circuit board
There are three types of the power circuit board. The type of the power circuit board varies depending on the
model of the Lossnay unit.
When replacing the circuit board, use the applicable circuit board according to the table below.
Caution:
The power circuit consists of live parts. The power circuit board is not insulated from the power line,
except for the connection part with the control circuit board. Before servicing (including replacing
the circuit boards), be sure to turn off the power supply isolator and check that all the LEDs on the
control circuit board and power circuit board are not lit. A large-capacity electrolytic capacitor on the
circuit board may carry voltage for several minutes after the isolator is turned off.
CN10
Supply fan motor
Pin No. of the connector
[1] Power for the motor: 325 V DC
[3] GND
[4] Power for motor control: 15 V DC
[5] Speed command voltage: 0 to 6 V DC
[6] Rotational speed pulse
CN9
Exhaust fan motor
Pin No. of the connector
[1] Power for the motor: 325 V DC
[4] GND
[5] Power for motor control: 15 V DC
[6] Speed command voltage: 0 to 6 V DC
[7] Rotational speed pulse
Fed with power: lit
Not fed with power: unlit
Power supply indicator
for motor control
(LED6 Red)
CN114, CN119, CN113
Control circuit board
connection
CN12
Damper motor output
208 to 230 V/60 Hz
TAB1, TAB2
Power supply input
208 to 230 V/60 Hz
Fuse1
10 A/250 V
Lot number indication
13 V DC
(Insulated)
Power for the circuit
GND
(Insulated)
Power for the circuit
Circuit board name
CN121
Control circuit board
connection [2] (*Note 1)
TAB1 is connected to the
power supply via the reactor.
*Note 1:
The connection is available only for the following models.
LGH-F940RVX2-E, LGH-F1200RVX2-E
Power circuit board Lossnay unit
LG-X08DC-P4 LGH-F300RVX2-E, LGH-F380RVX2-E
LG-X08DC-P6 LGH-F470RVX2-E, LGH-F600RVX2-E
LG-X08DC-P5
LG-X08DC-P6
LGH-F940RVX2-E, LGH-F1200RVX2-E
(Equipped with two types of the power circuit board)