Aftermarket Parts : Contactors and Surge Protectors

 

Contactors

1. Definition and Function:

   • An electrical switch that activates another component based on a signal from a sensor, similar to a motion-activated light switch.
   • Works in conjunction with the thermostat to start the system when the temperature exceeds a threshold.

2. Components and Ratings:

   • Number of Poles: Indicates the number of inputs and outputs (single pole, pole and a half, two pole, three pole). Replace with the same type or a higher pole count if necessary.
   • Input Voltage: Typically 24V for residential AC, 110V, or 208-230V for commercial systems.
   • Amperage Rating: Common ratings are 30, 40, and 50 amps. Always use a contactor with an equal or higher rating, not lower.

Surge Protectors

1. Purpose:

   • Protect electrical devices from surges in voltage or amperage, similar to home surge protectors.
   • Essential for modern HVAC equipment due to increased sensitivity to voltage changes.

2. Types of Surges:

   • External Surges: Caused by external sources like lightning or power fluctuations.
   • Internal Surges: Caused by internal devices putting a strain on the electrical system (e.g., using a hair dryer and vacuum simultaneously).

3. Installation and Operation:

   • Installed between the input power and the protected device (e.g., condensing unit, air handler, or furnace).
   • Detects unsafe amperage levels and shuts off power to prevent damage.