HVAC Unit 7

What type of tubing is generally used for refrigerant piping?

ACR

What type of tubing would be used for natural gas on a gas furnace?

Steel or wrought iron

Types K and L tubing have different....?

Wall thickness

ACR tubing is measured by its....?

Outside diameter (OD)

When tubing is cut with a tubing cutter, a ________ is often produced from excess material pushed into the end of the pipe from the pressure of the cutter.

Burr

The maximum temperature at which soldering (soft soldering) is done is about....?

800 degrees Fahrenheit

Brazing is done at _________ soldering.

Higher temperatures than

A common filler material used to solder lines containing potable water is composed of....?

95/5 tin-antimony

A common filler material used for brazing is composed of....?

5%-60% silver

What is a heat source often used for soldering and brazing?

Air-acetylene

A flux is used when soldering to...?

Minimize oxidation while the joint is being heated.

When soldering or brazing, the filler metal is ....?

Melted by heat from the tubing and fitting.

A flare joint...?

Uses a flare on the end of a piece of tubing against an angle on a fitting, secured with a flare nut.

A swaged joint....?

Is made by expanding one piece of tubing to fit over another piece of tubing of the same diameter.

Steel pipe is joined by....?

Threaded fittings or welding

In the thread specification 1/2-14NPT, the 14 stands for...?

Number of threads per inch.

Why is the end of a piece of steel pipe reamed after it is cut?

To remove the burr from the inside of the pipe.

Plastic pipe is often used for...?

Plumbing, venting, and condensate applications.

What are the four types of plastic pipe?

ABS, PE, PVC, and CPVC

Tubing maybe cut using?

Hacksaw or tubing cutter