SiUS04-904 Other Considerations256 Other Considerations1.3 Application of Silicon Grease to Power Transistor andDiode BridgeApplicableModelsAll outdoor units using inverter type compressor for room air conditioner.When the printed circuit board of an outdoor unit is replaced, it is required that silicon grease (*1) isapplied to the heat radiation part (the contact point to the heat radiation fin) of the power transistorand diode bridge.*1: Parts number of the silicon grease – 1172698 (Drawing number 3FB03758-1)Details The silicon grease is an essential article for encouraging the heat radiation of the power transistorand the diode bridge. Applying the paste should be implemented in accordance with the followinginstruction.Remark: There is the possibility of failure with smoke in case of bad heat radiation. ompletely wipe off the old silicon grease heat radiation fin. venly apply the silicon grease to the whole. Do not have any foreign object such as solder or paper waste between the power transistor, thediode bridge and the heat radiation fin. irmly tighten the screws of the power transistor and the diode bridge contact to the heatradiation fin without any gap.Take out a PCBDiode bridge(Diode bridge, Rectifier stack, etc.)Power transistor(TRM, TPM, IGBT, IPM, SPM, etc.)Not applied. Paper wastageOK : Evenly appliedsilicon grease.NG : Not evenlyappliedNG : Foreign object.(R9056)
