Application Of Silicon Grease To A Power Transistor And A Diode Bridge224 - Daikin SUPER MULTI NX G Series Service Manual

SiUS12-928_A
4. Application of Silicon Grease to a Power Transistor
and a Diode Bridge
Applicable
All outdoor units using inverter type compressor for room air conditioner.
Models
When the printed circuit board of an outdoor unit is replaced, it is required that silicon grease (*1) is
applied to the heat radiation part (the contact point to the radiation fin) of the power transistor and
diode bridge.
Details The silicon grease is an essential article for encouraging the heat radiation of the power transistor
and the diode bridge. Applying the paste should be implemented in accordance with the following
instructions.
 Completely wipe off the old silicon grease on a radiation fin.
 Eevenly apply the silicon grease to the whole.
 Do not have any foreign object such as solder or paper waste between the power transistor, the
 Firmly tighten the screws of the power transistor and the diode bridge, and to securely connect
<Example>
Trial Operation and Field Settings
Application of Silicon Grease to a Power Transistor and a Diode Bridge
*1: Parts number of the silicon grease – 1172698 (Drawing number 3FB03758-1)
Note: There is the possibility of failure caused by smoke from bad heat radiation.
diode bridge and the radiation fin.
them to the radiation fin without any gap.
Take out a PCB
OK : Evenly applied
silicon grease.
Power transistor
(TRM, TPM, IGBT, IPM, SPM, etc.)
Diode bridge
(Diode bridge, Rectifier stack, etc.)
Not applied.
NG : Not evenly NG : Foreign object.
applied
Paper waste
(R9056)
224