Exam 16: Advanced Automatic Controlsdirect Digital Controls Ddc and Pneumatics

____________________ driers use some of the same products that refrigerant driers use, silica gel or molecular sieve as an adsorbent.

Pneumatic controls must have a permanent air supply that is ____.

Thermostat has some small switches in the back that are called ____________________ switches that allow the technician to set this thermostat up for the particular piece of equipment that it is controlling.

A ____ is either in the pressure reducer or in the downstream side of the system to ensure that the control air pressure does not exceed about 30 psig.

_______________________ send information back to the controller in terms of resistance (ohms).

In a(n) ____ loop, all changes happen within the loop.

____ control systems were used before electronics.

The ____________________ is the device that responds to a change in conditions.

List the types of driers often used to dry control air located in a storage tank..

All control systems can be subdivided into ____, no matter how many controls there are.

DDC is a control process in which a microprocessor, acting as a digital controller, constantly updates a database of internal information.

________________ is the part of the digital controller where this information is stored.

__________________________ send information back to the controller in terms of milliamps (mA) or volts.

What are the advantages of using pneumatic controls?

____, usually housed internally inside the controller, convert the information from either analog to digital (A/D) or digital to analog (D/A) format.

What are some of the features of a thermostat?

The pilot positioner has a main air supply that is governed by the ____.

Controlling the water flow to the room's needs is called ____.

The temperature in the room is known as the ____ air temperature.

A device called a ____ is used to control the large volume of air in a air conditioning system.