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Basics: Heating Systems

Across
Designed to open when the temperature exceeds the desired operating of the furnace; the contacts close if the temperature returns to an acceptable level
Designed to operate before the burner ignites; its operation forces the poisonous combustion fumes into the flue pip
An extremely sensitive switch that is normally closed and is located nearby the burner housing or heat exchanger opening; its job is to open (break the circuit) and cut power tot the gas valve in the event of the flame "rolling out" of its designated area
Operates when called for at high speed during the cooling mode and low speed during the heating mode
Vent responsible for directing the byproducts of combustion from the furnace to outside the building
Allows you to manually shut off the gas to the furnace, regulate gas pressure at the furnace, acts as a safety cutoff, and automatically opens & closes in response to system requirements
This safety devise melts if the temperature exceeds safe levels; it provides back-up protection to the limit switch
Type of exchanger that has openings at both the top and bottom to provide common ignition of the fuel and common venting of the byproducts; also know as Individual section - more favorable style since there is a larger surface area allowing greater heat transfer
Set of conditions that must be met before an unrelated or separate electric circuit can be energized
Type of exchanger configuration has only one chamber in which combustion takes place
Distributes heated air through the duct system to the apartment; operates when the heat exchanger has reached the desired temperature, as well as at the end of the heating cycle to allow the heat exchanger to cool
Down
Ignition systems that uses a pilot light with a safety control also called a power pile. It creates a small electrical current that tells the combination control that the pilot light is burning. If the pilot light goes out, it will shut off the gas supply to the furnace
Ignites the gas as it passes through the valve. common methods include: standing pilot, intermittent pilots, direct spark ignition, and hot surface ignition
A component that decreases electrical power to the voltage level used in HVAC controls
Where combustion takes place
At its most basic a switch
Energizes the blower motor and the multiple heating elements at regular time intervals by opening and closing electrical contacts
Pipe through which gas flows to the burners which is connected to the gas valve
Provides a heat transfer surface from which heat is move to the air in the apartment as well as keeping the byproducts of combustion separate from this air
Cycles the blower on and off at the appropriate times
Designed to be a switching point for the fan