HART-1303 – Air Conditioning Controls Principles- FINAL

What is the primary purpose of air conditioning control systems?

• Increase cooling efficiency only

• Monitor and adjust indoor air quality and temperature

• Measure refrigerant pressure

• Provide backup power

What does a thermostat control in an air conditioning system?

• Refrigerant flow

• Voltage level

• System temperature

• Static pressure

Which of the following is a basic component of a control circuit?

• Filter drier

• Compressor

• Transformer

• Expansion valve

What is the function of a transformer in a control circuit?

• Increase voltage for compressors

• Convert AC to DC

• Step down line voltage for control use

• Energize the contactor coil

Which voltage is commonly used in residential air conditioning control circuits?

• 240V

• 24V

• 120V

• 12V DC

What does the "G" terminal on a thermostat control?

• Compressor

• Heating element

• Fan

• Cooling contactor

Which thermostat terminal is typically connected to the cooling signal?

• W

• Y

• G

• C

The "R" terminal on a thermostat usually connects to:

• The fan

• The ground

• 24V power from the transformer

• The compressor

What does the "W" terminal usually control in a thermostat wiring configuration?

• Cooling

• Fan

• Reversing valve

• Heating

The "C" terminal on a thermostat is also known as:

• Control

• Compressor

• Common

• Current