Current Relay Operation and Components

The video tutorial from Jumper Man Tech explains the function and operation of current relays in HVAC systems. It covers the components, wiring, and connections of current relays, and provides a detailed explanation of their operation, including the role of locked rotor amperage and magnetic fields in closing contacts. The tutorial also includes a diagram to illustrate the relay's functionality and concludes with a recap of the key points.

What is the primary function of current relays in single-phase motors?

• To assist in starting the motor

• To decrease the motor's power consumption

• To increase the motor's speed

• To regulate the motor's temperature

What are the main components of a current relay?

• A high resistance coil and normally closed contacts

• A low resistance coil and normally closed contacts

• A high resistance coil and normally open contacts

• A low resistance coil and normally open contacts

Which terminals on a current relay are connected to the compressor's start and run windings?

• L and S

• M and L

• M and S

• L and M

What does the 'L' terminal on a current relay represent?

• The start winding

• The run winding

• The ground connection

• The power line

In the diagram of a current relay system, which points are considered universal?

• L, M, and S

• M, S, and 1

• L, 1, and 2

• S, 1, and 2

What happens when a locked rotor condition occurs in a current relay?

• The relay shuts down

• The contacts close due to a magnetic field

• The coil resistance increases

• The contacts remain open

How does the current relay's magnetic field affect the contacts during operation?

• It closes the contacts temporarily

• It has no effect on the contacts

• It opens the contacts permanently

• It reverses the contacts' polarity

What role does the start capacitor play in the current relay circuit?

• It decreases the starting torque

• It regulates the voltage

• It increases the running torque

• It boosts the starting torque

What occurs when the compressor reaches three-fourths of its speed?

• The magnetic field strengthens

• The amperage decreases and contacts open

• The start capacitor is activated

• The contacts remain closed

What is the final outcome of the current relay operation in an HVAC system?

• The start winding remains active

• The system continues to run through the main winding

• The system shuts down

• The system switches to a backup relay