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Exam 18: Troubleshooting Modern Refrigeration Heating and Air 252dconditioning Control Circuitry and Systems

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Question 1

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The electric motor is the smallest load used in most heating, cooling, and refrigeration systems.

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Question 2

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Electric switching devices such as contactors and relays rarely cause electrical problems.

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The ____________________ diagram is a picture of the control panel and is sometimes called a component arrangement diagram.

Most diagrams have a(n) ____________________ that helps the technician to interpret the abbreviations used in the diagram.

Troubleshooting the electrical control circuits in a cooling, heating, or refrigeration system is basically common sense.

Manual switches are basic devices that are used to set the temperature of a motor.

What is the first check that a technician should make on a service call?

The most important tools that the technician has for troubleshooting are electric meters.

How are thermostats and pressure switches controlled?

The low-voltage thermostat used on residential and light commercial conditioned air systems is difficult to diagnose because of its complexity and the fact that it is used for several purposes in a heating and cooling system.

A(n) ____________________ chart is a graphical representation of a troubleshooting procedure for a particular unit.

Because electric motors are inexpensive, there is no real need to troubleshoot them.

After determining that voltage is available to the control circuit of a residential air-conditioning system, what four devices should be checked when troubleshooting the system?

The ____________________ type of diagram asks questions that require a response before the technician proceeds to the next step.

A(n) ____________________ is an overload device that senses the current draw of the compressor through the lockout loop (LL).

Troubleshooting charts usually need to be ordered because they are not included with equipment at the time of shipment.

Explain the purpose of the electronic self-diagnostic feature. How does it communicate results?

The electrical wiring diagram is the technician's primary tool in electrical troubleshooting.

Volt-ohm meters only measure volts and ohms.

What two types of meters are commonly used in the industry?