HVACR Symbols

What are the five basic components to any schematic?

1. A power supply 2. A path for the power 3. A load or component that operates from the power. 4. A switch or component that interrupts the power to the load. 5. A legend or key that explains what the various symbols and abbreviations used in the schematic mean.

Name three types of wiring diagrams.

1. Ladder 2. Line diagram 3. Installation diagram

An electrical connection at an intersection of lines (conductors) in a Schematic is indicated by a(n) ________________.

A Dot

An electric circuit must have a source of electrons, a device in which the Electrons do work, and a path for the electrons to follow. A practical Circuit also requires ______________.

A device that controls the load in the circuit (Switch or relay points)

The list of letters that identifies the components represented in a Schematic is called the ____________.

Legend

"L1" and "L2" in a ladder diagram indicate the ____________ and ____________, respectively.

Line and the Load

In any electric circuit, it is important for safety purposes that the switch Be placed in the ____________ side of the electrical load.

Line side

The letters "NC" placed next to a switch or relay symbol in a schematic Indicates a _____________ device.

Normally Closed

Which one of the four basic types of wiring diagrams is of primary Interest to the service technician?

Schematic or Ladder diagram

In a schematic, the designation "SPST" indicates a _____________.

Single Pole Single Throw Switch