By the compressor while it's running, Compressor Contactors for Air Conditioners and Heat Pumps Compressor contactors are are simply heavy-duty switches that allow it to carry extra amperage that is used.
The contactor is made up of coil typically two contacts for contactor and 1 for pole contactor..
The contacts that make the switch on call for heating or cooling are made of oxide.
That, in turn, turns on the compressor and the condenser fan motor because the contacts on the contactor close..
When the contacts close sometimes there is arcing of electricity from the fixed contact and contact that moves to the fixed contact.
This arcing of electricity creates heat and the heat, depending on the amperage, can melt or scar the contacts.
Over time this damages the contacts and this can in the failure of the contactor.
Compressor Contactors for Air Conditioners and Heat Pumps - 3-pole Contactor with Auxiliary Contacts Compressor Contactors for Air Conditioners and Heat Pumps - 3-pole Contactor with Auxiliary Contacts 3-pole Contactor with Auxiliary Contacts..
The contactor has armature that slides down when the coil of the contactor is energized.
If the noise becomes too annoying the solution is to replace the contactor with new one ..
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