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SiUS121502E
5. Silicon Grease on Power Transistor / Diode Bridge
Outline
Apply the specified silicon grease to the heat radiation part of a power transistor / diode bridge when
you replace an outdoor unit PCB. The silicon grease encourages the heat radiation of a power
transistor / diode bridge.
Detail
1. Wipe off the old silicon grease completely.
2. Apply the silicon grease evenly. See the illustrations below for examples of application.
3. Tighten the screws of the power transistor / diode bridge.
4. Make sure that the heat radiation parts are firmly contacted to the radiation fin.
Note: Smoke emission may be caused by bad heat radiation when the silicon grease is not
Trial Operation and Field Settings
appropriately applied.
OK: Evenly applied
NG: Not evenly applied
NG: Foreign matter is stuck.
Silicon Grease on Power Transistor / Diode Bridge
Power transistor
(or diode bridge)
Silicon grease
Foreign matter
PCB
Radiation
fin
(R21865)
(R21866)
(R21867)
199
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