CHOWS UNIT 6 Flashcards by Stirling Ragasa

True or False:
Nails are sometimes coated with zinc to protect them from corrosion.

True

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True or false:
A wall anchor is a one-time fastener.

False

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True or false:
A pin rivet must be installed in a properly sized, pre-drilled hole.

True

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True or false:
Perforated strap is a very versatile fastener as it can be used on all sizes of pipe.

True

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True or false:
A “blind rivet” is used when you cannot see the two pieces of metal that you are joining.

False

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True or false:
A toggle bolt is a one-time fastener.

True

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True or false:
A pipe strap is a very versatile fastener as one size fits all sizes of pipe.

False

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True or false:
To fasten a duct hanger to a gypsum board wall, the best fastener would be an anchor shield.

False

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Wood screws come in three type heads. They are flat, round, and _________.

Oval

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A sheet metal screw that does require a drilled receiving hole is called ________.

Self tapping screw

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To secure two pieces of sheet metal together, a technician may use a (n) _________ screw since no pre-drilling is required.

Self drilling

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The easiest way to secure thermostat cable is to use a (n) _____________.

U groove staple gun

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Set screws come with six (6) different points. They are flat, cone, oval, cup, dog, and _______.

Half dog

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The most common fastener used for securing an object to a solid concrete slab would be the ___________.

Masonry nails

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Six (6) different types of heads for machine screws are flat, round, oval, pan, hexagon, and ________.

Phillister

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The term used to designate the size of a nail is __________ and the symbol is d.

Penny/pence

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Rivets used to fasten two pieces of sheet metal where only the outside surface is accessible are called ________ rivets.

Plastic/pop

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Which is the largest diameter wood screw, a No. 8 or No. 10?

No. 10

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Describe two types of staples and an example of their use.

U groove - utilized for wood material
Outward clinch tacker - utilized for fastening wood and metal insulation duct work and other light weight materials.

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Name three (3) types of fastening devices that can be used to mount an object to a hollow wall.

Toggle bolts, self drill anchor, plastic toggle

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Used to connect a wire under a screw without completely removing screw

Spade tongue

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Used to connect a wire to a “male terminal”

Female quick connector

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Used to join two pieces of wire together

Butt connector

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Used to connect a wire under a screw terminal when screw has been completely removed.

Ring tongue

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To fasten a duct hanger strap to a floor joist, the nail used would be a _____.

Roofing nail

The hole drilled in sheet metal for a tapping screw should be the approximate size of ______.

The thread root diameter

Hollow rivets are assembled on a pin often called a (n) _____.

Mandrel

For fastening a pipe strap to a cement wall, the nail used would be a _____.

Masonry nail

For fastening two pieces of rough lumber together, the nail used would be a _____.

Common nail

In the tapping screw dimension “6-20 X 1/2 type AB, slotted hex,” the term 20 indicates the _____.

Number of threads

To secure a flexible duct onto a duct collar, the best fastener would be a (n) _____.

Nylon strap

An outward clinch tacker is used to ____.

Spread the ends of a staple outward

In the machine screws dimension “5/16 - 18 UNC-2,” the 5/16 indicates the ______.

Outside thread diameter

For recessing the nail for filling and finishing the wood surface, the nail used would be a ___.

Finishing nail

Kapiolani is working on a wine cooler unit and he needs to remove 18n rivets for the cover to come off what should he do ______

Drill it out

What is another name for a screw on wire connector?

Wire nut

Staples are used in the HVAC field to: a.) _________ b.)____________

A. Fasten insulation to duct work B. Secure low voltage wire

When Connecting stranded wire under a screw terminal (like a thermostat) what process should be used to ensure a secure and solid connection is obtained?

The stranded wires should be “tinned” to ensure a secure & solid connection

Lag screws come with a _____ _______ or a ____ ______ and a tapered shaft.

Hexagon head, square head

Devyn asks what is a cotter pin used for?

A cotter pin is used to secure two or more components together, usually where a bolt or shaft needs to be held in place.

The best tool to used to tighten the lag screw without completely is a _______ or _____ and _____.

Ratcheting or socket and adjustable wrenches

You are asked on a job site by your boss what is steel channel and threaded rods used for in the HVAC trade? And what tool would you use to cut this material with?

Steel channels are used as support frames or brackets to hang things such as duct work and piping systems. They provide durability and support for the weight of HVAC components. Threaded rods are use to suspend equipment from ceilings or walls. To cut steel channel and threaded rods a reciprocating saw/bandsaw is utilized.

Set screws are used to keep ______ from turning on a _____.

Pulley, Shaft

Christian asks what type of fasteners are used to mount a backing plate, for a ductless split ac fan coil unit to gypsum board wall? And how far apart are studs in walls?

Commercial = 16” apart Residential = 24” apart Fasteners utilized = zippets, anchor shields, drywall screws (self drilling)

Name some typical set screws styles start with the most popular

Flat point, cone point, oval point, cup point, dog point, half dog point, (Four corner option can deflect helium)

Wall anchors are used for _______ & _________.

Plastic board, gypsum board

What type of fastener is used to secure treaded rod to angle iron in a ceiling support?

I-Beam/ beam clamp

Toggle bolts are used for ________ & _________.

Plaster board, gypsum board

What is PAT used for?

A powder actuated tacker is utilized for fastening materials to concrete, steel, or other hard surfaces these tools use a small explosive charge to drive a fastener such as a nail or screw into the material.

Anchor shields are used for _______ & _________.

Masonry concrete, hollow tile

You are working with Jonas and he ask you what is a unistrut clamp used for?

A unistrut clamp is used to secure and support many different things such as pipes, conduit, cables, and a lot of other things.

Name 3 types of strap a.)______ b.) _____ c.)_______

A. Pipe strap B. Perforated strap C. Nylon strap

You are working with Bryan and he ask you what is a grille clip used for?

Fastened grills to end of duct work

What tool is used to make solderless terminal connection?

Crimping tool

Sketch 4 types of machine screws heads.

Oval Round Flat Hex

Aristotle is responding to a trouble call on the roof of Home Depot. The call is for several packages unit not cooling. What size and type of fastener will he encounter? What tool should he bring to remove them?

3/8 - 5/16 Self drill / self tapping hex head fasteners

Joe G is dispatched to a call on a Mitsubishi City Multi ductless split system to replace a compressor, What tool should he bring to remove the type of fastener that is used to hold down the compressor? And what type fastener is it?

Metric Bolt (10,12) 12”-16” Extensions Socket wrench

Micah is asking what is the product Fire stop used for in the HVAC field and how do we use it? Also how does it work?

Fire stop is a type of insulation that is utilized around piping/tubing. The material is used to contain a fire from further progression and hopefully protect piping/tubing. Use to seal off penetration

Explain the methods of using seismic restraints in HVAC.

Seismic restraints in HVAC systems use methods like bracing and anchoring to secure equipment and ductwork against lateral forces during earthquakes. These techniques prevent sliding and tipping, ensuring system stability and functionality in seismic events.

Walk me thru the steps for using epoxy anchoring and its application in the HVAC field.

????

When installing a concrete anchor how do you know what is the right size drill bit to use?

Check anchor box for specifications

What fasteners do you need with unistrut to build out a condenser stand?

3/8 socket, ratchet, washer

Tai asks how would you remove a wedge anchor explain steps.

????

Draw a flu with an aux drain pan and explain how you would hang it from a concrete ceiling deck include seismic restraints. What type of tools and materials would you need list them.

Explain what application a tap on screw is used for and what are the common sizes used in HVAC.

A tap on screw is commonly used in HVAC applications for securing components like ductwork, insulation, and metal frames. It features a sharp tip that allows it to penetrate materials without pre-drilling, making it ideal for quick installations and repairs. ### Common Sizes Used in HVAC: - #8 and #10: These are the most frequently used sizes for general fastening in HVAC applications. - 1/2 inch to 1 inch lengths: The length may vary depending on the thickness of the materials being secured, typically ranging from 1/2 inch to 1 inch. - Self-tapping screws: These may come in various sizes, often specified by the gauge (like #8 or #10) and length, depending on the specific installation requirements. These screws are often made of stainless steel or coated for corrosion resistance, suitable for various HVAC environments.

CHOWS UNIT 6 Flashcards

(65 cards)