Rest Of Terms For 17 March Flashcards
What is the function of a heat exchanger in a warm air furnace?
Transfers heat from combustion gases to air without mixing them.
What does the fuel burning device do in a warm air furnace?
Ignites and burns fuel to generate heat for the furnace.
What is the purpose of the cabinet or enclosure in a warm air furnace?
Houses all furnace components and provides structural support.
What role does the fan and motor play in a warm air furnace?
Circulates heated air through the duct system.
What is the function of the air filter in a warm air furnace?
Traps dust, dirt, and debris to improve indoor air quality.
What does a humidifier do in a warm air furnace?
Adds moisture to the heated air to improve comfort and prevent dryness.
What are the controls in a warm air furnace used for?
Regulate furnace operation, including temperature and safety features.
What is the function of a gas valve in a gas burner assembly?
Controls gas flow to the burners, available in different opening styles.
What does the pilot burner gas supply do?
Provides a small flame to ignite the main burner gas.
What is the purpose of the burner manifold with orifice inserts?
Distributes gas evenly to individual burners.
What does the primary air shutter and locking screw adjust?
Adjusts the air-to-gas mixture for proper combustion.
What are ribbon, slot, or jet burner ports?
Openings where gas and air mix to create flames.
What is the function of pilot runner or crossover igniters?
Carries the pilot flame to ignite multiple burners.
What does the pilot burner and thermocouple assembly ensure?
Ensures safe ignition and monitors pilot flame presence.
What is the tap for manometer use?
Connection point for measuring gas pressure adjustments.
What is the purpose of an attractive cover in the cabinet or enclosure?
Provides a finished look while protecting internal components.
What does insulation around the heat exchanger do?
Reduces heat loss and improves efficiency.
What components are kept protected and organized in the cabinet or enclosure?
Controls, fan, and motor, filter, and other devices.
What do service access panels allow?
Allow technicians to perform maintenance and repairs.
What is the importance of supply and exhaust duct locations?
Ensures proper airflow distribution.
Why is the heat exchanger airtight for air movement?
Prevents combustion gases from mixing with circulated air.
What does a transformer do in a control system?
Steps down voltage to power control circuits.
What is the function of a thermostat?
Senses room temperature and signals the furnace to turn on or off.
What does an electric gas valve do?
Electrically operated valve that controls gas flow to burners.
What is the purpose of a limit switch?
Shuts off the burner if the furnace overheats.
What does a fan switch control?
Controls the blower motor operation based on temperature.
What is the function of a combination fan-limit switch?
Controls both fan operation and overheating protection.
What does a pilot light do?
Small flame that ignites the main burner in older systems.
What is the function of a thermocouple?
Safety device that shuts off the gas supply if the pilot flame goes out.
What does pilot safety ensure?
Ensures gas does not flow to the burner if the pilot light is out.
What are setback thermostats?
Programmable thermostats that adjust temperature based on user settings to save energy.
What do intermittent ignition systems replace?
Replaces standing pilot lights with electronic ignition for greater efficiency.
What are vent dampers used for?
Automatically open and close to prevent heat loss through the vent when the furnace is off.
