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Unit 15 Troubleshooting Basic Controls

Section 3: Basic Automatic Controls
STUDY
PLAY
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.