Deck 23: Heating, Ventilating, and Air-Conditioning Hvac, and Pattern Development

Question 1

How does a zoned control system differ from a central ing, Ven ing, forced-air system? and air-CondiTioning (hVaC), and

Answer 1

A zoned system allows the occupant to determine how many areas are heated and how much energy is used. No ductwork is required; each room has a thermostat for control.

Question 2

Define thermostat.

Answer 2

A thermostat is an automatic mechanism for controlling the amount of heating or cooling given by a central or zoned heating or cooling system.

Question 3

Under what general conditions is ventilation required?

Answer 3

Ventilation is required when excess heat, fumes, moisture, odor, or pollutants must be removed and replaced with fresh air.

Question 4

Name two types of hot water systems.

Question 5

Name two types of forced-air systems.

Question 6

What are section drawings used for in HVAC drafting?

Question 7

List three factors that contribute to the proper placement of a thermostat.

Question 8

How are schedules keyed to the HVAC plan? Part 2: Pattern Development

Question 9

What are detail drawings used for in HVAC drafting?

Question 10

What is the basic principle of refrigeration?

Question 11

What is the general purpose of an HVAC system?

Question 12

Describe two types of sectioning practices used in HVAC drafting.

Question 13

Name two types of HVAC plans (based on line technique).

Question 14

Define duct.

Question 15

Identify six sources of pollutants in a structure.

Question 16

HVAC systems are also commonly known as ____ systems.

Question 17

Describe the basic function of an air-to-air heat exchanger.

Question 18

When are pictorial drawings used in HVAC drafting? 59728_ch23_EOC_ptg01.indd 1 03/02/16 10:38 am

Question 19

Describe HVAC schedules and their importance.

Question 20

Describe the basic function of a heat pump system. PaTTern deVeloPmenT ProblemS

Question 21

Describe the basic principle of pattern development.

Question 22

A transition piece is also known as a __________________.

Question 23

Name and sketch three types of hemmed edges.

Question 24

Define stretch-out line.

Question 25

Define triangulation.

Question 26

Name and sketch four types of seams.

Question 27

What is the key to pattern development?

Question 28

Briefl y describe how sheet metal patterns can be created on a CADD system and have the information transferred to a flat pattern or directly to manufacturing.

Question 29

Why is it important to have a working knowledge of descrip- tive geometry for pattern development?

Question 30

Define truncated.