Chapter 5
The difference between atmospheric pressure and gauge pressure at sea level.
What is 14.7psi?
The amount of times an expendable refrigerant can be used.
What is once?
The process of removing refrigerant from a system and storing it in a cylinder.
What is recovery?
A system is pressurized after losing its total charge.
what is with an inert gas?
The reason no moisture can be left inside a system.
what is acids will form?
The principles of this law are demonstrated when temperature remains constant, but pressure and volume express an inverse relationship.
What is Boyle's Law?
The ASHRAE classification for refrigerants that are highly toxic with low flammability.
what is B1?
The process in which a technician removes moisture and air from a system.
What is an evacuation?
The maximum amount of refrigerant that a recovery cylinder should contain.
What is 80% water capacity by weight?
Applied pressure on a saturated vapor is increased.
What is, some of the vapor will condense?
A small pressure measurement above or below atmospheric pressure.
What is Inches of Water Column?
The refrigerant that replaced R-22.
What is R-410A?
The danger in overfilling a refrigerant cylinder.
The position a king/queen valve should be in during a system evacuation.
what is mid-position?
A technician knows the skin temperature of a standard air-cooled condenser and determines the refrigerant temperature in the condenser.
what is, by adding 30°F to 35°F to the condenser temperature?
The cooling effect evaporative cooling systems rely on.
What is State Change?
A 400 series refrigerant will have this.
What is temperature glide?
This straightens as applied pressure increases.
What is a bourdon tube?
The process of pumping a system's entire refrigerant charge into the liquid receiver.
The calculation for subcooling.
what is SC = LSAT - LLT?
The highest point at which a substance may be in a liquid state, regardless of the applied pressure.
What is critical temperature?
The five chemical categories used to classify some refrigerants today.
What is
Chlorofluorocarbons (CFCs),
hydrochlorofluorocarbons (HCFCs),
hydrofluorocarbons (HFCs),
hydrofluoro-olefins (HFOs),
hydrocarbons (HCs)?
The process in which liquid refrigerant is recovered first.
what is an active push-pull recovery?
Typically found inside resin kits.
What is an epoxy and a hardener?
The target operating temperatures for comfort cooling applications.
What is a 40 to 50 degree F evaporator and 110 to 120 degree F condenser?