Service Manual

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Step Details Check item
4
Removing the circuit boards
• For the working precautions, see page 40.
• For removing the circuit boards, see (4) Control parts (For LGH-F300RVX2-E to LGH-F600RVX2-E)
(page 45) or (5) Control parts (For LGH-F940RVX2-E and LGH-F1200RVX2-E) (page 47).
5
Attaching the circuit boards
[1] According to the function status record data prepared in Step 3, set the address
setting switches, function selection switches, and model selection switch of the
new circuit board.
a. Address setting (SW12 and SW11)
b. Function selection switches (SW2, SW5) and model selection switch (SW6)
setting
Address
setting
Function
setting
Model
selection
[2]
Attach the power circuit board in the reverse order of the steps for removing.
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.
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)
Be sure to connect the connectors listed in the following table.
Connector Symbol on the circuit board Check
For power supply connection TAB1
*1
, TAB2
For exhaust fan motor connection CN9
For supply fan motor connection CN10
For damper motor connection CN12
For control circuit board connection CN113, CN114, CN119, CN121
*2
*1
Connect TAB1 to the power supply via the reactor.
*2
Only LGH-F940RVX2-E and LGH-F1200RVX2-E are equipped with CN121.
Lower Unit: CN113, CN114, CN119 Upper Unit: CN113, CN121
Circuit board
fixing screw
(1 pc.)
PCB case fix-
ing screw
(1 pc.)
Earth fixing
screw (1 pc.)
[3] Attach the control circuit board in the reverse order of the steps for removing, and
then connect the connectors, remote controller transmission cable, M-NET trans-
mission cable, and external signal cable, etc.
Be sure to connect the connectors or terminals listed in the following table.
( Connect PZ-62DR-EA or PZ-43SMF-E transmission cable terminal, M-NET
transmission cable terminal, and connector/terminal for external signal cable
only when they are used.)
Connector and terminal Symbol on the circuit board Check
For thermistor connection
(outdoor temperature (OA))
CN7
For thermistor connection
(indoor temperature (RA))
CN5
For power circuit board connection CN13
*3
, CN14, CN19, CN21
*3
PZ-62DR-EA or PZ-43SMF-E transmission
cable terminal
TM4 [1] [2]
M-NET transmission cable terminal TB5 [A] [B]
For external signal cable connection
TM2, TM3, CN17, CN23, CN26,
CN32, CN34, CN35, CN50, CN105
*3
Only LGH-F940RVX2-E and LGH-F1200RVX2-E are equipped with CN13 and CN21.
Circuit board
fixing screw
(1 pc.)
PCB fix plate
fixing screw
(2 pcs.)
Connector
connection
PZ-62DR-EA
transmis-
sion cable
connection
M-NET trans-
mission cable
connection
External
signal cable
connection
[4] Reattach the control box cover.
• LGH-F300RVX2-E to LGH-F600RVX2-E : Cover screw 3 pieces
• LGH-F940RVX2-E and LGH-F1200RVX2-E : Cover screw 8 pieces
Cover screw
(black)