Why is it important to protect refrigerant piping form exposure to dirt & other contaminants?

dirt can damage the HVAC system

how is hard copper tubing different from soft copper tubing?

thicker walls, so withstands higher system pressure

"Nominal" size of piping means...

The approximate measurement of the inside diameter

Tubing differs from piping due to ...

the wall thickness and inside diameter

Commercial refrigeration systems difficult to design & operate. Which is NOT a reason for this?

more pipe is used, but fewer fittings are allowed

When is copper pipe a better choice than plastic pipe for HVAC purposes?

to transport refrigerant in air conditioning systems

The use of fewer fittings in your HVAC piping means

less chance for leaks and pressure drops

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Copper Piping Practices #1

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Copper piping for HVAC piping practices

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Questions 16

Answers

1
Why is it important to protect refrigerant piping form exposure to dirt & other contaminants?
dirt creates unsightly work spaces
dirt can damage the HVAC system
dirt will be infiltrated into the inside environment
dirt affects the pressurized system
2
What type of pipe should be used if the diameter needed is above 3 inches?
welded steel pipe
pvc
copper pipe
flexible plastic pipe
3
how is hard copper tubing different from soft copper tubing?
can be joined using flare fittings
shorter in length
less likely to leak at fittings
thicker walls, so withstands higher system pressure
4
"Nominal" size of piping means...
the approximate measurement of the outside diameter
the length of the pipe before it's threaded
the thickness of the pipe walls
The approximate measurement of the inside diameter
5
When tubing is "annealed," you know it will be...
rigid
transferable
stable
soft
6
Tubing differs from piping due to ...
the wall thickness and inside diameter
the length of each piece
the material from which it is made
the outside diameter and length
7
Which copper pipe is too thin to be ACR approved for use in pressurized refrigerant lines?
ACR
K
M
L
8
What do we use to cut copper tubing?
tube cutter
threader
chop saw
copper-cutting scissors
9
Commercial refrigeration systems difficult to design & operate. Which is NOT a reason for this?
Because refrigerant pressures can be near vacuum conditions
more pipe is used, but fewer fittings are allowed
oil return problems are critical at low temperatures
line sizes are larger, so evaporator refrigerant temps vary
10
When is copper pipe a better choice than plastic pipe for HVAC purposes?
for transporting water as a heat exchange medium
to transport refrigerant in air conditioning systems
for special refrigerants, such as ammonia
for large commercial air conditioning systems
11
Which piece of information is NOT labeled on the outside of a pipe?
metal content
tube type (K, L, M, DWV)
country of origin
trademark of manufacturer
12
which piping is not a good choice for transporting natural gas for heating systems?
brazed copper
flexible plastic pipe
black iron
PVC
13
When bending a copper pipe, what common mistake should be avoided?
five times the diameter
flattening the tube
curving the tube
curving less than 10 times the diameter
14
The use of fewer fittings in your HVAC piping means
fewer bends and threading, so pipe remains more intact
greater chance to reuse the pipes if needed
less chance for leaks and pressure drops
time saved on the job site
15
Why do we anneal copper for piping?
Heating removes the nitrogen; correcting the discoloration.
Heating changes it to steel.
Heating allows it to be bent into various shapes.
Heating strengthens it.
16
Why does soft copper tubing need fewer connections?
it doesn't require brazing
its length
it can be bent by hand

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