Daikin FTX09NMVJU, Service Manual

Page: 133 / 145

SiUS091601E Silicone Grease on Power Transistor / Diode Bridge
Trial Operation and Field Settings 122
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.
Detail 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.
(R22541)
Power transistor
(or diode bridge)
Silicone grease
Radiation
fin
PCB
(R21866)
Foreign matter
(R21867)