HVAC Components & Review

What is the function of a thermostat in an HVAC system?

• Distributes the signal (R) from the 24v transformer to the proper destination

• Controls the speed of the blower motor

• Controls the pressure in the high pressure line

• Controls the speed of the condenser fan motor

What is the purpose of a hot surface igniter in a gas furnace?

• To measure the pressure in the low pressure line

• Glows Orange to light the flame

• To control the speed of the blower motor

• To control the sequence of the furnace

What does a thermal roll-out sensor do in an HVAC system?

• Controls the speed of the blower motor

• Controls the speed of the condenser fan motor

• Measures the pressure in the high pressure line

• Opens if flames are detected outside of the exchanger

What is the function of a 24 Volt Transformer in an HVAC system?

• Converts primary voltage of 120 or 240 to 24 volts

• Controls the speed of the blower motor

• Controls the signal to the 24v transformer

• Controls the pressure in the high pressure line

What is the purpose of an auxiliary heater in a heat pump?

• Used to supplement heat in cold temperatures

• Controls the speed of the blower motor

• Controls the speed of the condenser fan motor

• Measures the pressure in the low pressure line

What does a breaker do in an HVAC system?

• Controls the speed of the condenser fan motor

• Measures the pressure in the high pressure line

• Controls the speed of the blower motor

• Disconnects the unit when too many amps pass through thus protecting wires and the system

What is the function of an overflow switch in an HVAC system?

• Controls the speed of the blower motor

• Protects the unit from condensation overflow

• Controls the speed of the condenser fan motor

• Measures the pressure in the low pressure line

What does a defrost board do in an HVAC system?

• Measures the pressure in the high pressure line

• Controls the speed of the condenser fan motor

• Controls the speed of the blower motor

• Sends signals to switch reversing valve for defrosting

What is the purpose of a hard start capacitor in an HVAC system?

• Controls the speed of the condenser fan motor

• Measures the pressure in the low pressure line

• Used to assist normal capacitor in the startup of compressor

• Controls the speed of the blower motor

What does an inducer fan motor do in an HVAC system?

• Ensures proper draft for flames in exchanger

• Controls the speed of the condenser fan motor

• Controls the speed of the blower motor

• Measures the pressure in the high pressure line