Unit 15 Troubleshooting Basic Controls

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Section 3: Basic Automatic Controls

Volt-amperes

Commonly referred to as VA. This rating can be used to determine whether the transformer is underrated or drawing too much current.
40 VA/24V = 1.66 A

Voltage Feedback

The meter is reading one side of the line straight from the transformer and on the other side of the line. (24 V)

Ohmmeter

This device measures resistance in a circuit.

Open Device

Measurement of infinite ohms.

"HOT" Contacts

Normally open set of contacts.

"COLD" Contacts

Normally closed set of contacts.

Pictorial Wiring Diagram

Used to locate the different components in the circuit.

Line Wiring Diagram

Often referred to as the ladder diagram, used to determine circuit functions.

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