ACR108-Unit 16 - Advanced Automatic Control (CRF) - Mr. Graham

A ___ reacts to stop, start, or modulate the flow of water, air, or refrigerant to the system or conditioned space.

• controlled device
• sensor

• controller

• none of the above

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

• control loops
• throttle loops

• control segments

• sensor segments

___ control systems were used before electronics.

• Pneumatic
• Manual

• Digital

• Mechanical

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

• clean and dry
• clean and moist

• clean and warm

• warm and dry

Most system compressors provide ___ psig of air pressure to the storage tank.

• 100 to 125
• 90 to 100

• 90 to 125

• 100 to 150

In most system compressors, the compressors are controlled with a ___.

• pressure switch
• heat switch

• limiter

• governor

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.

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

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

• internal diaphragm
• internal switch

• internal lockout

• internal float

Controlling the water flow to the room’s needs is called ___.