Heating Basics
This fuel type is most commonly used in residential furnaces
What is natural gas?
This refrigerant replaced R-22 in most modern systems
What is R-410A?
The measurement of airflow in HVAC systems
What is CFM?
The low-voltage wire that calls for cooling
What is Y?
This toxic gas is produced by incomplete combustion
What is carbon monoxide?
This component ignites the fuel in a gas furnace
What is the igniter?
The process of removing heat from the indoor air
What is refrigerant?
This part of the duct systems returns air to the HVAC unit
What is the return duct?
What is the C-wire?
Techs must have this certification to handle refrigerants
What is EPA 608?
The percentage of energy converted to heat in a furnace is known by this rating
What is a AFUE?
This component absorbs heat inside the home
What is the evaporator coil?
Static pressure is measured with this tool
What is a manometer?
This component controls the blower's speed
What is the fan control board?
Clearance to combustibles around gas furnaces is required by these rules
What are manufacturer specifications/local codes?
A cracked one of these can cause carbon monoxide leaks
What is a heat exchanger?
Low refrigerant can cause this common evaporator coil problem
What is freezing?
Undersized ducts often cause this blower symptom
What is high static pressure/poor airflow ?
This voltage level is standard for thermostat control circuits
What is 24 volts?
Electrical panels require this minimum service clearance
What is 36 inches?
This safety device shuts off gas flow if flame isn't detected
What is the flame sensor?
The refrigerant cycle law stating pressure and temperature change together
What is the Pressure-Temperature relationship?
The formula for total external static pressure is supply + this
What is return static?
A thermostat that uses sensors and algorithms to learn user behvaior
What is a smart or learning thermostat?
These pipes must be properly sloped to drain condensation
What is the condensate line?