Electrical Schematic Drawings Quiz

What is the purpose of the connection diagram in a wiring diagram?

• To illustrate the cooling system

• To determine wire colors and component connections

• To explain the symbols used

• To show the sequence of operation

What voltage is present above the step-down transformer?

• 12 VAC

• 240 VAC

• 120 VAC

• 24 VAC

What does the FRS 1 switch do?

• Activates the blower motor

• Controls the gas valve

• Opens on temperature rise

• Closes on temperature rise

What is the function of the CPU in the appliance?

• To provide power to the blower motor

• To control the gas valve

• To monitor the safety controls

• To activate the igniter

What happens when the room thermostat closes its contacts?

• The blower motor stops

• The CPU shuts down

• The gas valve opens

• The heating cycle is activated

Which terminal is connected to the hot terminal in a residential thermostat?

• W

• Y

• G

• R

What does the IDR relay control?

• Pressure switch

• Blower motor

• Gas valve

• Induced draft motor

What is the purpose of the pre-purge period?

• To ignite the gas

• To allow the blower to run

• To ensure the vent fan is operational

• To cool down the furnace

What does the GVR-1 relay control?

• Pressure switch

• Blower motor

• Gas valve

• Induced draft motor

What happens when the thermostat is satisfied?

• The gas valve opens

• The igniter remains on

• The blower motor continues running

• The CPU loses power