Advanced controls for HVAC

Front

What is the function of a control transformer in HVAC systems?

Back

A control transformer steps down voltage to a lower level (e.g., 24V) for control circuits in HVAC systems.

Front

What is the VA rating of a transformer and why is it important?

Back

The VA rating indicates the maximum load the transformer can handle without overheating. It is crucial for ensuring the transformer operates within safe limits.

Front

What is the maximum amperage output of a 40 VA transformer at 24V?

Back

1.67 amps (calculated as VA rating divided by voltage: 40 VA / 24 V = 1.67 A).

Front

What does the line side of a switch connect to?

Back

The line side of a switch connects to the voltage supply.

Front

What is the result of connecting Line 1 to Line 1 in a circuit?

Back

0 volts, as they cancel each other out.

Front

What is the result of connecting 24V hot to 24V common?

Back

24 volts, as they are in the same circuit.

Front

What color wire is typically used for heat control on a thermostat?

Back

White.

Front

What is the purpose of the grounding lug in an electrical circuit?

Back

The grounding lug provides a safe path for electrical current to ground in case of a fault, preventing electric shock.

Front

What is the difference between load side and line side in a switch?

Back

The load side is where the electrical load is connected, while the line side is connected to the power source.

Front

How do you calculate the total voltage in a series circuit?

Back

By adding the voltages of each component in the circuit.