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(6) Apply the Silicone Thermal Grease to the semiconductors (IC701,DB510,DB511,Q590) on the service PC board,
and align the PCB mount holes on the PCB with the PCB mounts, and fix the FAN IPDU to the outdoor control
unit by clipping the PCB into the PCB mounts (③).
(7) Screw the FAN IPDU to the heat sink by five screws that were removed in step (3). If the screws are loose, the
effected component will generate heat, and cause in to breakdown. Do not use an electric driver or an air driver,
as it can cause component damage. The torque of 5 screws (IC302,DB510,DB511,Q590) is “0.37 ft•lbs(0.5N･
m)”.
(8) Re-connect the connectors and Faston and screw terminals(①). Be sure that all the connectors and the Faston
terminals are connected correctly and securely inserted.
(9) If the components on the PCB were bent during this procedure, straighten them so they do not to touch other
parts.
(10) Install the cover, then turn on the supply. Check the operation.
Uniformly apply the Silicone Thermal Grease to the heat dissipating surfaces of the IPM (IC701),
DB510, DB511, Q590.
Note: Do this work carefully since allowing any dirt, scratches, etc. to be left on the PC board
mounting areas of the semiconductors will impair the heat dissipation effect and may result in
a failure.
Silicone Thermal Grease use one of the following
･Momentive Performance Materials ‘’TIG1000’’
･Dow Corning Toray ‘’SC102’’
･Mizutani Electric Ind ‘’HSC1000’’
･Shin-Etsu Chemical ‘’G-746’’ or ‘’G-747’’
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