Where to find Freon pressure chart?


  #1  
Old 09-03-10, 06:25 AM
R
Member
Thread Starter
Join Date: Aug 2010
Location: usa
Posts: 235
Received 0 Upvotes on 0 Posts
Where to find Freon pressure chart?

I have reported Trane XR13 system that is not working properly.
I need to prepare for the Tech to come to do diagnosis. One thing I wan to avoid is that they just randomly throw some guess saying I am either high or low on Freon.

I want to know what the normal range for Freon Pressure is for Trane XR13? I went thru the manual and the manual only says sub-cooling, which confused me.

I would appreciate if anyone can point to me the normal range of Freon preasure for XR 13?
 
  #2  
Old 09-03-10, 09:37 AM
C
Member
Join Date: Aug 2008
Location: Texas, California
Posts: 1,425
Upvotes: 0
Received 8 Upvotes on 8 Posts
Pressure varies with ambient temp. so measure subcool is a better way to see if your system is performing well. But in general, lowside R-22 pressure should be (depends on the unit) somewhere around 70-80 at 85-90 F ambient temp.
 
  #3  
Old 09-03-10, 10:06 AM
R
Member
Thread Starter
Join Date: Aug 2010
Location: usa
Posts: 235
Received 0 Upvotes on 0 Posts
thank you for your reply.
do you mean that subcool chart is the only chart available for 'normal' pressure range?
 
  #4  
Old 09-03-10, 12:15 PM
C
Member
Join Date: Aug 2008
Location: Texas, California
Posts: 1,425
Upvotes: 0
Received 8 Upvotes on 8 Posts
Most Pros use subcool and superheat to measure the system performance. They have to use both pressure gauge and temp gauge to get those numbers. They are all related.
 
  #5  
Old 09-03-10, 01:22 PM
M
Member
Join Date: Sep 2009
Location: U.S. Midwest
Posts: 1,173
Upvotes: 0
Received 0 Upvotes on 0 Posts
R-22 saturation pressure and temperature table: http://www.me.umn.edu/courses/me4131...amicTables.pdf
 
  #6  
Old 09-03-10, 02:30 PM
R
Member
Thread Starter
Join Date: Aug 2010
Location: usa
Posts: 235
Received 0 Upvotes on 0 Posts
thanks for your response. I will check it out from the chart.
 
  #7  
Old 09-03-10, 04:01 PM
M
Member
Join Date: Sep 2009
Location: U.S. Midwest
Posts: 1,173
Upvotes: 0
Received 0 Upvotes on 0 Posts
Originally Posted by Rj2010
thanks for your response. I will check it out from the chart.
The chart is only for saturated conditions. Not applicable for most points on an A/C cycle. But you can use it to check subcooling, etc.

The liquid line will be below saturation temp. The supply to the condenser will be at or above saturation temp.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: