1

HVACR317 – Core for Refrigeration

Reading and Writing Ladder Diagrams

2

SAMPLE WIRING DIAGRAM

3

SAMPLE LADDER DIAGRAM

4

LADDER DIAGRAM DRAWING COMPONENTS

APPLIED POWER

L1 N120 VAC

5

LADDER DIAGRAM DRAWING COMPONENTSLINE DEVICES

(CONDUCTORS)

L1 N120 VAC

6

LADDER DIAGRAM DRAWING COMPONENTS

LOAD DEVICES

L1 N120 VAC

R

7

LADDER DIAGRAM DRAWING COMPONENTSLINE DEVICES

L1 N120 VAC

R

8

LADDER DIAGRAM DRAWING COMPONENTS

LINE DEVICES control LOAD DEVICES

L1 N120 VAC

R

9

LADDER DIAGRAM DRAWING COMPONENTS

LINE DEVICES to the LEFT

L1 N120 VAC

R

10

LADDER DIAGRAM DRAWING COMPONENTS

LOAD DEVICES to the RIGHT

L1 N120 VAC

R

11

LINE DEVICES MUST CONTROL AT LEAST 1

LOAD

L1 N120 VAC

R

12

L1 N120 VAC

R

POTENTIAL SHORT CIRCUIT

13

WIRING DIAGRAM TO LADDER DIAGRAM

14

WIRING DIAGRAM TO LADDER DIAGRAM

15

WIRING DIAGRAM TO LADDER DIAGRAM

16

WIRING DIAGRAM TO LADDER DIAGRAM

17

WIRING DIAGRAM TO LADDER DIAGRAM

18

COMPLETED LADDER

DIAGRAM