Silicone Grease On Power Transistor/Diode Bridge - Daikin FTXM-V Series Service Manual

Silicone Grease on Power Transistor/Diode Bridge

5. Silicone Grease on Power Transistor/Diode Bridge

Outline
Apply the specified silicone grease to the heat radiation part of a power transistor/diode bridge
when you replace an outdoor unit PCB. The silicone grease encourages the heat radiation of a
power transistor/diode bridge.
Details
1. Wipe off the old silicone grease completely.
2. Apply the silicone 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 silicone grease is not
appropriately applied.
 OK: Evenly applied
 NG: Not evenly applied
 NG: Foreign matter is stuck.
158
Power transistor
(or diode bridge)
Silicone grease
Foreign matter
Part 7 Trial Operation and Field Settings
SiUS042113E
PCB
Radiation
fin
(R22541)
(R21866)
(R21867)