Questions and Answers
How are set screws classified?
Head style
What thread class is used if rapid assembly and disassembly of a part is required?
UNC
How are screws larger than 1/4" diameter sized?
Fractions of an inch
Before flanged ends are bolted together, they must first be ________.
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Before installing a Tapcon® screw, ________.
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What type of hardware is used to prevent gears and pulleys from spinning on a shaft?
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What weight rating (in pounds) of the vibration isolators should be used for a 200-pound air handler suspended by four threaded rods?
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Flexible duct connectors are commonly used with _________.
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How is a split-system condensing unit installed in an area where seismic activity occurs?
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When mounting an air handler on a concrete floor for seismic restraint, use ________.
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Connectors that can be used with copper and aluminum conductors will be marked _________.
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What is the purpose of the inspection hole in the barrel of a crimp-on terminal?
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For wiring in most HVAC equipment, connectors are applied using _________.
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Conductor strands exposed as a result of stripping will result in _________.
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In what position in the crimp-on terminal must the conductor insulation be for a proper connection?
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Non-expanding concrete anchors are held in place with _________.
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Seismic restraints are placed on HVAC equipment to prevent ________.
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Study Notes
Fasteners and Hardware Terminology
- Head style classifies set screws based on their head design, which determines their compatibility and fitting.
- UNC (Unified National Coarse) thread class is preferred for rapid assembly and disassembly due to its coarse pitch facilitating quick engagement and disengagement.
Measuring and Sizing
- Screws larger than 1/4" diameter are sized using fractions of an inch, emphasizing the importance of precision in diameter specifications.
Installation Practices
- Before bolting flanged ends together, proper alignment is essential to ensure a secure and functioning connection.
- Prior to installing a Tapcon® screw, it is necessary to drill a pilot hole to allow for easier and more accurate installation.
Hardware Components
- A key is a type of hardware designed to prevent gears and pulleys from spinning freely on a shaft, ensuring proper mechanical function.
Load and Weight Considerations
- For suspending a 200-pound air handler using four threaded rods, each vibration isolator must have a weight rating of 100 pounds to effectively manage the weight.
Ductwork Components
- Flexible duct connectors are primarily used with metal ducts, providing adaptability in HVAC systems.
Seismic Installation Guidelines
- In areas with seismic activity, split-system condensing units should be secured by attaching to a concrete pad with anchor bolts to ensure stability.
- Open-spring devices equipped with bumpers should be used when mounting an air handler on a concrete floor to provide seismic restraint.
Electrical Connectors
- Connectors suitable for both copper and aluminum conductors will be marked with AL-CU to indicate their compatibility.
- The inspection hole in the barrel of a crimp-on terminal serves to check wire position, ensuring correct installation.
Crimping Tools and Safety
- Manual crimping tools are commonly utilized for applying connectors in most HVAC equipment installations.
- Exposed conductor strands from improper stripping present a safety hazard, potentially leading to electrical shorts or failures.
- For a proper connection, the insulation of the conductor must be positioned in the belled mouth of the crimp-on terminal.
Anchoring and Restraint
- Non-expanding concrete anchors rely on grout for securing placement, ensuring stability within the installation.
- Seismic restraints are installed on HVAC equipment specifically to prevent unwanted movement during seismic events.
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Test your knowledge on fasteners, hardware, and wiring terminations with these flashcards. Each card presents a key term or concept, helping you to grasp essential definitions and classifications used in this field. Perfect for students and professionals alike.
