Question

[Gas furnace sequence of operation] Newer (inducer fan) 1. Thermostat class for _____ 2. _________ fan starts 3. __________ switch makes 4. ________ activates (spark, hot surface) 5. Gas valve (opens/closes) -- ______ lights 6. _____ has 3 seconds to verify 7. Fan starts due to ______ _______ time

Answer 1

The student's question pertains to the sequence of operations in a gas furnace with an inducer fan. The sequence begins with the thermostat initiating a call for heat and proceeds through several steps involving the inducer fan, pressure switch, ignition process, gas valve operation, flame verification, and system delay before the main fan initiates.

Step-by-step explanation:

The student is asking about the operation of a gas furnace with an inducer fan, which is a critical component in modern HVAC systems. In the given sequence, the steps for the operation of a gas furnace with an inducer fan are as follows:

1. Thermostat calls for heat.
2. Inducer fan starts.
3. Pressure switch makes.
4. Ignition activates (spark, hot surface).
5. Gas valve opens and burner lights.
6. Flame sensor has 3 seconds to verify.
7. Fan starts due to system delay time.

Each step is critical to ensuring the safe and efficient operation of the heating system. Additionally, the inducer fan helps to expel exhaust gases and facilitate fresh airflow for combustion.

Learn more about Gas Furnace Sequence of Operation