Samsung AR18HSFNBWKNEU Service Manual page 116

New Function [ Indoor Terminal Block Safety Device ]
1. Thermal Fuse is installed in Terminal Block as below.
(Thermal Fuse is used to prevent PL caused by a defective connection of indoor and outdoor units)
Thermal Fuse
Connection of terminal block
Terminal Block Internals
and Main PBA
2. Thermal Fuse is opened when internal temperature of Terminal Block goes to a certain point due to Tracking caused by
a defective connection of indoor and outdoor units.
- When Thermal Fuse is opened, Main PBA (DC12V) is turned off and the indoor unit does not operate.
(There is no problem with Main PBA in this case)
- In the above case, the change of all-in-one Terminal Block will make Main PBA operate again.
Circuit Block
3. Measurement method of fair/defective thermal fuse
Fail Defective
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