Silicone Grease On Power Transistor/Diode Bridge - Daikin 4MXL-T Series Service Manual

SiUS121827E

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
3. Tighten the screws of cover.
4. Make sure that the heat radiation parts are firmly contacted to refrigerant pipe.
Note(s)
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.
Part 7 Trial Operation and Field Settings
application.
Heat sink
Cover

Silicone Grease on Power Transistor/Diode Bridge

Power transistor
(or diode bridge)
Foreign matter
PCB
Silicone grease,
which you do not
need to apply.
Silicone grease
Refrigerant pipe
R7000168
R7000158
R7000159
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