Question

What is the sequence of operations on an 80%-90%+ efficient furnace? (7 steps)

a) Ignition, Combustion, Heat exchanger operation, Blower operation, Shut-off, Venting, Cool down
b) Venting, Heat exchanger operation, Combustion, Ignition, Blower operation, Shut-off, Cool down
c) Ignition, Combustion, Venting, Heat exchanger operation, Blower operation, Shut-off, Cool down
d) Heat exchanger operation, Combustion, Ignition, Blower operation, Venting, Shut-off, Cool down

Answer 1

The sequence of operations for an efficient furnace involves venting, ignition, combustion, heat exchanger operation, blower operation, shut-off, and cool down, in that order.

Step-by-step explanation:

The sequence of operations for an 80%-90%+ efficient furnace typically involves the following steps:

1. Venting: The system begins by expelling any remaining gases from the previous cycle to ensure it's safe to ignite new fuel.
2. Ignition: The ignition process starts, typically with an electric spark, to light the burner.
3. Combustion: The burner fires up and the furnace begins burning fuel to produce heat.
4. Heat exchanger operation: The heat produced from combustion warms up the heat exchanger.
5. Blower operation: The blower fan moves air across the heat exchanger to distribute heat throughout the home.
6. Shut-off: Once the desired temperature is reached, the furnace turns off the burner.
7. Cool down: The blower continues to operate for a short period to cool down the heat exchanger and use any residual heat.

These steps ensure efficient operation, providing heat while maintaining safety and minimizing energy waste.