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Application of Silicon Grease to a Power Transistor and a Diode Bridge SiUS091133
391 Trial Operation and Field Settings
5. Application of Silicon Grease to a Power Transistor
and a Diode Bridge
Applicable
Models
All 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 silicon grease
(*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 proper heat radiation of the power transistor and the diode
bridge. Applying the grease should be implemented in accordance with the following instruction.
Note: There is a possibility of failure and smoke emission in case of poor 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 transistor and
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 radiation fin
without any gap.
<Example>
The shape of the electrical box and PCB vary depending on the model.
(R9056)
OK : Evenly applied
silicon grease.
NG : Not evenly
applied
Take out a PCB
Diode bridge
(Diode bridge, Rectifier stack, etc.)
Power transistor
(TRM, TPM, IGBT, IPM, SPM, etc.)
Not applied.
Paper waste
NG : Foreign object
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