Deck 6: Reading Schematic Diagrams

Question 1

A packaged air-conditioning unit is manufactured in one piece with all components including the thermostat.

Answer 1

False

Question 2

A(n) ____________________ is a refrigeration system that is designed to maintain a temperature lower than 32°F in a refrigerated case.

Answer 2

commercial freezer

Question 3

What are the electrical components of a walk-in cooler?

Answer 3

The electrical components of a walk-in cooler include an evaporator fan motor, a compressor, a condenser fan motor, and electrical controls.

Question 4

The schematic diagram resembles a ladder in that it is made up of two vertical lines representing the incoming electrical sources.

Question 5

The ____________________ of a control is the point at which the contacts open or close, depending on the function of the control.

Question 6

A heat pump is an air-conditioning system that uses a reversing valve to reverse the refrigeration cycle in order to provide heating.

Question 7

What are the loads in the commercial freezer?

Question 8

If the control system is set for heating and the temperature in the structure drops below the set point, the first stage of the heating thermostat opens.

Question 9

The efficiency of a heat pump decreases as the outdoor temperature drops, and at a certain point, called the _____________________, the heat pump can no longer supply enough heat to properly condition the structure.

Question 10

The electrical source refers to the electrical energy being supplied to equipment.

Question 11

List the electrical components of a dehumidifier.

Question 12

A(n) ____________________ system is a control system that is operated by less voltage than that applied to the equipment.

Question 13

The schematic wiring diagram uses photos to represent electrical components in the system.

Question 14

Why is a circuit-by-circuit arrangement used on schematic diagrams?

Question 15

What is the purpose of a humidistat?

Question 16

A(n) ____________________ is a refrigerated area that is conditioned by a mechanical refrigeration system.

Question 17

A(n) _____________________ takes the humidity out of air in a specific area.

Question 18

The _____________________ is the section of the furnace that encloses the gas flame.

Question 19

The ____________________ diagram not only identifies the electrical components that are in the unit, but also illustrates how the unit works and electrical connections that need to be made.

Question 20

The _____________________ is a cycle of operation of a heat pump that is designed to defrost the outside coil during the heating operation