Contactors are used in both residential and HVAC units as means of energizing or de-energizing load . Contactors are electrically controlled switches.
This magnetic field is used to pull the contacts closed, applying power to Springs are used to open the contacts when the magnetic field is de-energized..
By the voltage of the system, The coils of contactor are energized. This voltage is 24, 120, 208 230, or 460 volts.
When replacing contactor, it's important to select the correct control voltage to match what is installed..
Two ways in which contactors fail are coil failure and contact failure. When coil failure occurs, the contactor will no longer pull in causing power to the load. When contact failure occurs, damaged contact fingers can cause power to one or more legs of the contactor..
Visually inspect the contacts to ensure that they are healthy condition. If the contacts are pitted or burned then they should be replaced..
Using your voltmeter, test the voltage across each leg of the contactor. voltage drop of more than one volt indicates bad contact. Replace the contactor if necessary...
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