Unit 6 Test Flashcards
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 needed to condition the space.
Balance point
A _____ is a refrigerated area that is conditioned by a mechanical refrigeration system
Walk-in cooler
Diagram that not only identifies the electrical components that are in the unit but also illustrates how the unit works and the electrical connections that need to be made is?
Schematic diagram
The point at which a control will open or close is called?
Set point
A cycle of operation of a heat pump that is designed to defrost the outside coil during the heating operations is?
Defrost cycle
What are the components of a dehumidifier?
Humidistat, Compressor, and Fan Motor
What are the electrical components of a walk-in cooler?
Compressor, evaporator fan motor, condenser fan motor, and electrical controls
A packaged unit is manufactured in one piece with all components included with the exception of the _____?
Thermostat
True or False. If the control system is set to heating and the temperature in the structure drops below the set point, the first stage of the heating is the thermostat opens
False. (Thermostat will close and provide 24 volts to the gas valve)
True or false. The electrical source refers to electrical energy being supplied
True
An appliance that is used to remove humidity from the air
Dehumidifier
A ______ is a refrigeration system that is designed to maintain a temperature lower than 32 degrees in a refrigerated case
Commercial freezer
A control system that is operated by less voltage than that applied to the equipment is?
Low-voltage control system
______ is the section of the furnace that encloses the gas flame
Combustion chamber
Why is a circuit by circuit arrangement used on schematic diagrams?
Allows techs to focus on small sections of the diagram to better troubleshoot
What is the purpose of the humidistat?
Device used to control humidity; it uses a moisture sensitive element to control a mechanical linkage that opens and closes an electric switch
What are the loads in a commercial freezer?
Compressor, condenser fan motor, evaporator fan motor, defrost heater, and defrost timer motor
True or False. A schematic wiring diagram uses photos to represent electric components of the system.
False (uses symbols)
True or False. A heat pump is an air conditioning system that uses a reversing valve to reverse the refrigeration cycle to provide heating.
True
True or false. The schematic diagram resembles a ladder that is made up of two vertical lines representing the two incoming electrical sources.
True
