Unit 16 Flashcards by Thomas Rivera

Q

What are the three basic components that make up a control loop?

A

Sensor, controller and control device

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Q

What is the difference between a close loop and an open loop system?

A

Open: inputs are before the controller
Close: inputs are after the controller, and Kenmore accurately adjusted changes made at the controller

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Q

Active sensor and information back to the controller in terms of _______ or _______.

A

Mili-amps or volts

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Q

Determine if the device is a controller, control, device, or sensor

Damper

A

Controlled device

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Q

Determine if the device is a controller, control, device, or sensor

Thermistor

A

Sensor

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Q

Determine if the device is a controller, control, device, or sensor

Valves

A

Controlled device

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Q

Determine if the device is a controller, control, device, or sensor

Thermostat

A

Controller

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Q

Determine if the device is a controller, control, device, or sensor

Humidistat

A

Sensor

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Q

Determine if the device is a controller, control, device, or sensor

Variable speed motor

A

Controlled device

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Q

Determine if the device is a controller, control, device, or sensor

Proportional Integral Derivative

A

Controller

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Q

Determine if the device is a controller, control, device, or sensor

Anemometer

A

Sensor

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Q

A passive sensor sent information back to the controller in terms of ________.

A

Resistance

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Q

The section on/inside the controller allows the microprocessor or digital controller to read the incoming data

A

Signal converter

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Q

Give two examples of a binary (digital) input

A

-High pressure switch and low pressure switch
-on or off
-left or right

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Q

T/F
The more poles a motor has the faster, the speed of the motor

A

False

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Q

T/F
The control device’s location determines if the control loop is open or closed

A

False

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Q

T/F
The small switches in the back of a thermostat are called dual in-line pair

A

True

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Q

T/F
Pneumatic controls can be used to switch electrical circuits

Study These Flashcards

A

True

Q

T/F
Control loops can only maintain one sensor input. If a room needs light intensity, temperature and humidity controlled, three control loops are required.

Study These Flashcards

A

True

Q

T/F
Space temperature is not the only temperature that is important in modern systems

Study These Flashcards

A

True

Q

What are four other temperatures that may be used to make an air-conditioning system operate, more efficiently and economical?

Study These Flashcards

A

-Ambient temp
-Indoor temp
-Supply air temp
-Return air temp
-Motor winding temp
-Discharge line temp
-Suction line temp

Q

Questions 22-33
Use the diagram to picture an open or close loop system. Be able to place sensors in the right location to make them open or closed loop.

Study These Flashcards

A

Q

The internal instructions on a control board are stored in the _________.

Study These Flashcards

A

Central processing unit

Q

Draw a ladder diagram showing a thermostat closing on the rise to pass power to a control, relay and liquid line solenoid that are wired in parallel. System power is 120 V.

Study These Flashcards

A

What are two types of dryers used to remove moisture from the air used in a pneumatic control system?

-refrigerated air drier -inline desiccant filter drier

How much change in output per degree of temperature change

Sensitivity

Reduce electrical power consumption by shutting down or reducing use of equipment during slow periods

Load shed

Controls that use solid-state semi conductors for electrical and electronic functions

Electronic control

Consist of sensor, controller and controlled

Control loop

Controlling the flow between maximum or no flow

Modulating flow

A continuous signal with an infinite number of step

Analog signal

Air used as a control

Pneumatic control

Sensitivity of a Control, such as how much change in output signal per degree of temperature

Gain

Electronic control that operates on very low voltages

DDC

Load shedding or duty cycling to lower electrical power costs

Energy management

Used to control large volume of air that must be used to operate large pneumatic devices

Pilot positioner

Codes that read out on an electrical panel that tells technician what the problem is

Error codes

Start up of a building AC or heating system whereby the system is started up earlier and allowed to run at reduced capacity for the purpose of recording a low demand metering for the billing period

Smart recovery

Modulating flow means ______. A, B, C, D multiple choice

Variable

Is it normal to hear a hissing sound when walking by a pneumatic thermostat?

Yes. Although a constant loud hissing could mean an air leakage which will need to be addressed.

Temperature, pressure, flow, light and humidity are all examples of _______ inputs

Analog

Convert 60°C to Fahrenheit

140°F

Be able to draw ladder diagrams for given circuits (two different diagram examples)