Application of Silicon Grease to a Power Transistor and a Diode Bridge SiBE041134170 Trial Operation and Field Settings5. Application of Silicon Grease to a PowerTransistor and a Diode BridgeApplicableModelsAll outdoor units using an inverter type compressor for room air conditioner.When the printed circuit board (PCB) of an outdoor unit is replaced, it is required that silicongrease (*1) be precisely applied to the heat radiation part (the contact point to the radiation fin)of the power transistor and the diode bridge.*1: Parts number of the silicon grease – 1172698 (Drawing number 3FB03758-1)Details The silicon grease is essential for encouraging the heat radiation of the power transistor and thediode bridge. Applying the grease should be implemented in accordance with the followinginstruction.Note: There is a possibility of failure with smoke emission in case of bad heat radiation. Wipe off the old silicon grease completely off the radiation fin. Apply silicon grease evenly to the whole surface of the radiation fin. Do not leave any foreign object such as solder or paper waste between the power transistorand the radiation fin, or the diode bridge and the radiation fin. Tighten the screws of the power transistor and the diode bridge, and contact to the radiationfin without any gap.The shape of the electrical box and PCB vary depending on the model.(R9056)Take out a PCBNot applied. Paper wasteNG : Foreign objectOK : Evenly appliedsilicon grease.NG : Not evenlyappliedPower transistor(TRM, TPM, IGBT, IPM, SPM, etc.)Diode bridge(Diode bridge, Rectifier stack, etc.)
