Used to isolate electrical components when conducting repair or maintenance to prevent injury or death.
What is Lock Out / Tag Out?
Solid, Liquid, and Gas
What are the three states of matter?
Pull, not push
How should a wrench be used?
Used as refrigerants in the late 1800s.
What are water and ammonia?
A compressor that uses pistons, connecting rods, and a crankshaft.
What is a reciprocating compressor?
Anything with a potential for harm.
What is a hazard?
The amount of heat added or released to change the temperature of 1 lb of substance by 1 degree F.
What is specific heat capacity?
They often have stems with a square end or a hex opening.
What is a refrigeration service valve wrench?
Required the US and other developed countries to stop producing CFCs.
What is the Montreal Protocol?
Compressor commonly used in residential air conditioning and heat pump applications.
What is a scroll compressor?
Frostbite, sunburn, heat exhaustion, and hypothermia
What are some injuries resulting from Temperature Hazards?
One British Thermal Unit (BTU)
What is the specific heat capacity of water?
A thin-walled tube of elastic metal bent into a circular shape that straightens as pressure inside it increases.
What is a Bourdon Tube?
400 Series Refrigerants
What series are zeotropic blends?
Temporarily reduces the pressure in a compressor.
What is an unloader?
Identifies the toxicity and flammability of refrigerants.
What is ASHRAE Standard 34?
A substance that is superheated or subcooled absorbs or rejects this type of heat.
What is sensible heat?
0.005 mm Hg vacuum equivalent
What is equivalent to five microns?
R-11 and R-12
What refrigerants are CFCs?
Mechanism going to far in one direction and overcorrecting too far in the other direction.
What is hunting?
Leather, aluminized, aramid fiber, and synthetic.
What are some types of gloves that HVACR technicians often use?
When a gas is compressed without gaining heat from or losing heat to its surroundings.
What is adiabatic compression?
This is accomplished by front-seating the King valve.
What is pumping down?
The lubricant used in systems with R-404A.
What are polyol esters (POE)?
When a line connects the suction line to the inside of the TXV.
What is an externally equalized TXV?