What is the normal position of a small compressor's starting relay contacts?

Prepare for the Refrigeration and Air Conditioning Mechanics (313A) Test. Study with flashcards and multiple choice questions, hints and explanations included. Ace your exam!

The correct answer indicates that, in a small compressor's starting relay system, the current relay is normally closed while the potential relay is normally open.

This configuration is significant because it pertains to the operational functionality of the relays. The current relay, which is used to sense the current running through the compressor, remains closed under normal operating conditions, allowing current to pass and enabling the compressor to start. However, if there is an overcurrent situation, the current relay will open, disconnecting the start capacitor and protecting the compressor from potential damage.

The potential relay, on the other hand, is designed to work with the voltage across the start winding. It usually stays open until the compressor reaches a certain operational speed, at which point it activates and disconnects the start components. This ensures that the start capacitor is removed from the circuit after the compressor has successfully started, allowing it to continue running efficiently on the run winding.

This combination of relay positions optimizes the compressor’s starting process while providing protection against starting faults, making it essential for the reliable operation of small compressors.

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