Safety
Energy & Matter
Tools & Instruments
Refrigerants
Components
100

Used to isolate electrical components when conducting repair or maintenance to prevent injury or death.

What is Lock Out / Tag Out?

100

Solid, Liquid, and Gas

What are the three states of matter?

100

Pull, not push

How should a wrench be used?

100

Used as refrigerants in the late 1800s.

What are water and ammonia?

100

A compressor that uses pistons, connecting rods, and a crankshaft.

What is a reciprocating compressor?

200

Anything with a potential for harm.

What is a hazard?

200

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?

200

They often have stems with a square end or a hex opening.

What is a refrigeration service valve wrench?

200

Required the US and other developed countries to stop producing CFCs.

What is the Montreal Protocol?

200

Compressor commonly used in residential air conditioning and heat pump applications. 

What is a scroll compressor?

300

Frostbite, sunburn, heat exhaustion, and hypothermia

What are some injuries resulting from Temperature Hazards?

300

One British Thermal Unit (BTU)

What is the specific heat capacity of water?

300

A thin-walled tube of elastic metal bent into a circular shape that straightens as pressure inside it increases. 

What is a Bourdon Tube?

300

400 Series Refrigerants

What series are zeotropic blends?

300

Temporarily reduces the pressure in a compressor.

What is an unloader?

400

Identifies the toxicity and flammability of refrigerants.

What is ASHRAE Standard 34?

400

A substance that is superheated or subcooled absorbs or rejects this type of heat.

What is sensible heat?

400

0.005 mm Hg vacuum equivalent

What is equivalent to five microns?

400

R-11 and R-12

What refrigerants are CFCs?

400

Mechanism going to far in one direction and overcorrecting too far in the other direction.

What is hunting?

500

Leather, aluminized, aramid fiber, and synthetic.

What are some types of gloves that HVACR technicians often use?

500

When a gas is compressed without gaining heat from or losing heat to its surroundings.

What is adiabatic compression?

500

This is accomplished by front-seating the King valve.

What is pumping down?

500

The lubricant used in systems with R-404A.

What are polyol esters (POE)?

500

When a line connects the suction line to the inside of the TXV.

What is an externally equalized TXV?