Service Manual

SiUS121827E Silicone Grease on Power Transistor/Diode Bridge
Part 7 Trial Operation and Field Settings 277
Note(s)
6. 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 on the refrigerant pipe completely.
2. Apply the silicone grease on the heat sink evenly. See the illustrations below for examples of
application.
3. Tighten the screws of cover.
4. Make sure that the heat radiation parts are firmly contacted to refrigerant pipe.
Smoke emission may be caused by bad heat radiation when the silicone grease is not appropriately
applied.
 OK: Evenly applied
R7000168
 NG: Not evenly applied
R7000158
 NG: Foreign matter is stuck.
R7000159
Power transistor
(or diode bridge)
Silicone grease
Silicone grease,
which you do not
need to apply.
Heat sink
PCB
Refrigerant pipe
Cover
Foreign matter