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No. Part name
T
Control
1) Disconnect lead wires and connectors connected
board
from the control board assembly to other parts.
1. Lead wires
assembly
2. Connectors
2) Disconnect cable connecting the main control board
assembly side and sub-control board assembly.
3) Remove the control board assembly from P.C. board
base.
1. Main control board assembly side
2. Sub- control board assembly side
3. Be sure to use the radiating sheet between heat
U
Rear
1) Perform work of item 1 of
cabinet
2) Remove fixed screws fixing to the bottom plate.
(ST1TØ4 x 10l l l l l 2 pcs.)
3) Remove fixed screws fixing to the heat
exchanger. (ST1TØ4 x 10l l l l l 2 pcs.)
4) Remove fixed screw fixing to the valve mounting
plate. (ST1TØ4 x 10l l l l l 1 pc.)
Procedure
• Connection with terminal block : 10 wires
(Black, Orange, Pink, Red, Two white wires,
Four white wires (reactors))
• Connection with compressor :
Remove the connector (3P).
• Connection with reactor :
Remove the relay connectors from
P07, 08 (2P, White) and P11, P12 (2P, Yellow).
• Main control board assembly side
CN300 : Outdoor fan (3P, White)
CN301 : Outdoor fan position detection (5P, White)
• Sub-control board assembly side
CN02 : TD sensor (3P, White)
CN05 : TGa sensor (3P, Yellow)
CN06 : TGb sensor (3P, Brown)
CN07 : TGc sensor (3P, Green)
CN08 : Case thermo. (2P, White)
CN12 : C room pulse modulating valve (6P , Green)
CN13 : B room pulse modulating valve (6P, Red)
CN14 : A room pulse modulating valve (6P, Black)
• Main control board assembly side
CN704 : Connecting cable (4P, White)
• Sub.-control board assembly side
CN15 : Connecting cable (4P, White)
• Remove two claws of P.C. board base, and
remove upward the heat sink with hands.
• Remove three screws fixing the heat sink and
main control board assembly side, and replace
the board with a new one.
• Remove P.C. board base from the inverter box.
• Remove two claws of P.C. board base, and
replace the board with a new one.
sink and IGBT and also screws with tube.
Q
R S
, and
.
– 76 –
Remarks
Main board
CN301
CN300
CN05
CN15
CN04
CN02
CN06
CN13
CN14
CN12
CN08
CN300 and 301 at the main
control board assembly side and
CN08 and 15 at the sub- control
board assembly side are connec-
tors with locks. Therefore,
remove the connector while
pushing the part indicated by an
arrow.
P. C. board base
P. C. board
When mounting a new board,
check that the board is correctly
,
set in the groove of base holder
of P.C. board base.
CN06 CN07
Sub-board
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