Inverter Board (Ec8) - Daikin LX10F11B Service Manual

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4.8.3 Inverter Board (EC8)

●Precautions when replacing inverter board
1) Wait 10 minutes or more after turning off the
circuit breaker and then open the inverter
box cover.
2) Before starting the work, open the inverter
box cover and check that the voltage
between terminals TP1 and TP2 on the
inverter board is 50VDC or less. (Fig. 1)
Fig.1 Layout of inverter boards TP1 and TP2
●Removing the inverter boards (Fig. 2)
1. Loosen the four nuts of the mounting bolts which
are securing the front cover, and then remove the
front cover.
2. Remove all cables connected to the inverter
board after check the voltage at TP1 and TP2.
3. Remove the inverter board (6 mounting bolts).
Hooking hole
Front cover
Fig.2 Inverter box
Projection
Inverter board
4-16
●Mounting the inverter board
The inverter board and the right cover are combined.
(Fig. 3)
1. Peel off the protective film (transparent) from the
heat transfer sheet which is attached to the back
of the inverter board plate.
＊ Be careful to avoid getting any foreign matter
on the heat transfer sheet to prevent air
bubbles from forming in the sheet.
2. Install the inverter board. Tightening order as
①⇒②⇒③⇒④⇒⑤⇒⑥. (Fig. 3)
Bolt tightening torque (M5): 229 ± 34 cN・m
3. Connect the cables to the inverter board.
4. Install the front cover.
Insert the projection at the top of the box into
hooking hole in the top of the front cover, and
then tighten the four nuts onto the bolts.
Bolt tightening torque (M6): 393 ± 58 cN・m
①
⑤ ③
④
⑥ ②
Front
Fig.3 Inverter board
Heat transfer
sheet
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