A/C pressure chart--need input

[agteacher]

A/C pressure chart---Shop Class use!!!

OK…. Since we have some professional A/C tech on the site---- I need HELP in making a “quick reference” chart for me and my students to use in shop class. This chart will be use as a “Starting Point” for diagnosing A/C problems on most automobile type systems.

Conditions:–Ambient temp.(80degs)—With shop fan blowing across condenser(to help simulate driving conditions) Idling and driving(2k rpms) AND assuming the A/C system is in “GOOD” working condition----

R12:
Idling----Low side pressure reading______ High side pressure reading_______
2k(load-driving)----Low side_______ High side________

134A:
Idling----Low side pressure reading_____ High side pressure reading_______
2k(load-driving)----Low side______ High side________

I know there are many variables, but we need a "rule-of-thumb" chart (most ed. books are very vague).

Thanks for your HELP

 

[Dabigguy]

I'm definitely not an AC guy, but this chart may be of help and the link to the forum will definitely be of assistance.
http://www.mastercool.com/media/temp_pressure_chart.pdf
Automotive AC Information Forum - ACKITS.COM
Automotive AC Information Forum - ACKITS.COM

 

[agteacher]

A/C pressure chart---Shop Class use!!!

OK…. Since we have some professional A/C tech on the site---- I need HELP in making a “quick reference” chart for me and my students to use in shop class. This chart will be use as a “Starting Point” for diagnosing A/C problems on most automobile type systems.

Conditions:–Ambient temp.(80degs)—With shop fan blowing across condenser(to help simulate driving conditions) Idling and driving(2k rpms) AND assuming the A/C system is in “GOOD” working condition----

R12:
Idling----Low side pressure reading______ High side pressure reading_______
2k(load-driving)----Low side_______ High side________

134A:
Idling----Low side pressure reading_____ High side pressure reading_______
2k(load-driving)----Low side______ High side________

I know there are many variables, but we need a "rule-of-thumb" chart (most ed. books are very vague).

Thanks for your HELP

??? any HELP!!!

 

[charlief1]

The problem you run into is that most charts are for specific design. Are you working on a CCOT, PEVR, VIR, or expansion valve/block system? Each one is different and the pressures will be different as well. The only "general" chart I know of is temp related with the system not running. It tells the average pressures of specific refridgerants at specific temps.