The control of the environment in commercial buildings is based on energy efficiency and ____.

A pneumatic control system is a control system in which ____ is used to provide power for the control system.

In the 1960s, ____ came into common use and was adapted for use in commercial HVAC control systems.

____ is a designation of the contaminants present in the air.

____ control systems are used to control basic closed loop systems that require relatively low accuracy.

The power to a self-contained control system is supplied by a sealed, ____.

As the temperature of the fluid in a pipe or air in a building space changes, the heat transfer in a self-contained control system changes the ____ of the fluid in the power element.

The two most common applications of self-contained control systems are ____ and building space temperature control in steam or hot water heating systems.

Most self-contained control systems have relatively poor ____.

Pressure acts against a ____ that moves a valve body to regulate the flow of refrigerant, steam, hot water, or chilled water through the valve.

Electrical control systems can use ____ to enable low-voltage control circuits to switch line-voltage devices.

____ are often used in industrial and commercial systems in which access by occupants is not possible.

Electrical control systems are not often used for ____ control because only digital (ON/OFF) control devices are used.

Humidity control is accomplished with a(n) ____ that uses a moisture-sensing element to open or close a switch.

Pneumatic control systems can be separated into ____ main groups of components based on their function.

Auxiliary devices _____ change or reroute the air supply from the transmitter or controller before it reaches the controlled devices.

A(n) _____ is an orifice that allows a small volume of air to be expelled to the atmosphere.

Pneumatic control systems can be used in most control sequences because of their _____.

A disadvantage of pneumatic control systems is that pneumatic air compressor stations require _____.

An electronic control system is a control system in which the power supply is _____ VDC or less.

A(n) _____ control system is a control system that uses a variable signal.

The result of an electronic control system is an output commonly between ___.

A resistive bridge circuit is a circuit containing ___.

The voltage signal is sent to a(n) ___, which opens or closes a valve or damper in response to the signal change.

An advantage of electronic control systems is ___.

A(n) ___ control system is a control system that uses digital solid-state components.

___ control systems are used in large commercial buildings such as hospitals, schools, military bases, and colleges.

In automated control systems, ___ are filtered to eliminate any interference or problems with the incoming power supply.

In automated control systems, each controller has an individual ___ in its on-board memory.

The program parameters in automated control systems may be modified and new control sequences and options added by reprogramming the ___ with a desktop PC, notebook PC, portable operator terminal, or keypad display.

A disadvantage of automated control systems includes ___.

A system-powered control system is a control system in which the ___ is used as the power supply.

In a system-powered control system, the air pressure, measured at about ___" wc, powers the control system.

System-powered control systems allow flexibility of zoning in a building because ____.

In a hybrid control system, the transducer has an input signal of ___.

Hybrid control systems minimize cost by ___.