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EPA Chart
We will be adding more courses with quizzes for the NATE tests in the coming months as well. Go to The class page for more information on subscribing to our site and trying our free practice test and playing some free HVAC learning games.
For this activity you will need this chart:
The best way to memorize this chart is to memorize it as shown below. When you walk in to take the test, quickly sketch this chart on the back on your test booklet or on scratch paper if they provide it:
| Ref |
Charge |
Before |
After |
| 22 |
under |
0 |
0 |
| 22 |
over |
4 |
10 |
| high |
under |
4 |
10 |
| high |
over |
4 |
15 |
| low |
(blank) |
25 |
25mm |
|
|
|
