Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-29-2012, 12:28 AM   #31
I'm Your Huckleberry
 
Join Date: Mar 2011
Posts: 5,876
Rewards Points: 2,204
Default

Adding R-22 increases suction temperature???


Quote:
Originally Posted by psehorne View Post
You just cleared up one of my misconceptions mentioned in my original post. Your statement is consistent with the statement on Payen's charging procedure. "Add refrigerant to lower suction line temperature." (decreasing superheat).

I'll add some more R-22 and hose down the unit. Will report back.

It's after midnight here in Texas. I don't know what timezone you are in, but in any event I appreciate you staying up with me. You may not hear from me again tonight. But tomorrow I will update you. Thanks for all your help.

Paul


I'm in Houston.

Doc Holliday is offline   Reply With Quote
Old 07-29-2012, 01:50 AM   #32
Member
 
Join Date: Jul 2012
Location: Texas
Posts: 56
Rewards Points: 75
Default

Adding R-22 increases suction temperature???


Quote:
Originally Posted by Doc Holliday View Post
Try the water trick to bring down the head pressure. A high head pressure is a sign of a clogged condenser.
After following your instructions I have the following to report:

OUTSIDE:
Suction gauge psi/temp 70/42
Suction line temp 46
Resulting in superheat of 4F.

INSIDE:
Supply vent temp 54F
Return air temp 73F (diff 19)
Wet-bulb 58.

The above inside readings did not change from previous readings. However, outside air temp had dropped to 86F. Still your superheat formula called for 4F.

Unfortunately after adding R-22 to bring the suction line temp down the head pressure settled in at 330 PSI - even after hosing down the condenser (in the dark with a flash light; so I will take a look at it again by the morning light).
psehorne is offline   Reply With Quote
Old 07-29-2012, 05:33 AM   #33
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,567
Rewards Points: 2,814
Default

Adding R-22 increases suction temperature???


May have a restricting LLFD.
beenthere is offline   Reply With Quote
Old 07-29-2012, 11:56 AM   #34
Member
 
Join Date: Jul 2012
Location: MD
Posts: 272
Rewards Points: 250
Default

Adding R-22 increases suction temperature???


stop adding refrigerant you are overcharged 270,290 or 330 too high. it is time to start taking it out either as I earlier described or take it all out and weigh it in. Grossly overcharged systems will act strange and to all but the most experiance techs seem right or even low and cause more charging. You have most likely a flooded indoor coil. Needs to be gas not liq.

Last edited by turnermech; 07-29-2012 at 11:59 AM.
turnermech is offline   Reply With Quote
Old 07-29-2012, 02:47 PM   #35
Member
 
Join Date: Oct 2011
Location: pa
Posts: 4,437
Rewards Points: 2,188
Default

Adding R-22 increases suction temperature???


you have a restriction....thats my call...
ben's plumbing is offline   Reply With Quote
Old 07-29-2012, 02:54 PM   #36
Member
 
Join Date: Jul 2012
Location: MD
Posts: 272
Rewards Points: 250
Default

Adding R-22 increases suction temperature???


Quote:
Originally Posted by ben's plumbing View Post
you have a restriction....thats my call...
I would not think so with 19 temp split.

remove refrigerant unitl you drop below 70 psi suction. then carge back to 8 to 12 super heat. Recheck your data.

I think your wet buld reading is unaccurate some how.
turnermech is offline   Reply With Quote
Old 07-29-2012, 02:57 PM   #37
Member
 
Join Date: Oct 2011
Location: pa
Posts: 4,437
Rewards Points: 2,188
Default

Adding R-22 increases suction temperature???


I don't think his reading are right somehow...but Iam not there I'll wait and see...what he comes up with...thanks ben
ben's plumbing is offline   Reply With Quote
Old 07-29-2012, 03:51 PM   #38
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,567
Rewards Points: 2,814
Default

Adding R-22 increases suction temperature???


Quote:
Originally Posted by turnermech View Post
I would not think so with 19 temp split.

remove refrigerant unitl you drop below 70 psi suction. then carge back to 8 to 12 super heat. Recheck your data.

I think your wet buld reading is unaccurate some how.
A system with a restriction can be over charged enough to easily get a 19 split across the inside coil.

Of course with a 105 outdoor temp, 290 is not out of line on many systems.
beenthere is offline   Reply With Quote
The Following User Says Thank You to beenthere For This Useful Post:
ben's plumbing (07-29-2012)
Old 07-29-2012, 04:18 PM   #39
Member
 
Join Date: Jul 2012
Location: MD
Posts: 272
Rewards Points: 250
Default

Adding R-22 increases suction temperature???


We have had temp 95-100 here most of the summer I have not seen a modern system running correctly whit liq line press of even 270 yet alone 290/330. Really old unit yes. Panye I don't think has been around that long for me to call them old.

I could be wrong but I can't see a restriction in a refrigerant circuit still having 19 split. All I can say is I have not seen one yet. OP has been adding refrigerant wiht a dirty filter his own statement. THE UNIT IS OVERCHARGED.

If it is overcharged, I would strongly suggest he get it out. 105 degrees 330 psi, soon he will need a compressor.

Last edited by turnermech; 07-29-2012 at 04:20 PM.
turnermech is offline   Reply With Quote
Old 07-29-2012, 04:24 PM   #40
Member
 
Join Date: Jul 2012
Location: Texas
Posts: 56
Rewards Points: 75
Default

Adding R-22 increases suction temperature???


It is now the hottest part of the day. Head pressure has climbed to 400 PSI. I am removing R-22. Will report back.
psehorne is offline   Reply With Quote
Old 07-29-2012, 04:27 PM   #41
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,567
Rewards Points: 2,814
Default

Adding R-22 increases suction temperature???


Quote:
Originally Posted by turnermech View Post
We have had temp 95-100 here most of the summer I have not seen a modern system running correctly whit liq line press of even 270 yet alone 290/330. Really old unit yes. Panye I don't think has been around that long for me to call them old.

I could be wrong but I can't see a restriction in a refrigerant circuit still having 19 split. All I can say is I have not seen one yet. OP has been adding refrigerant wiht a dirty filter his own statement. THE UNIT IS OVERCHARGED.

If it is overcharged, I would strongly suggest he get it out. 105 degrees 330 psi, soon he will need a compressor.

A LLFD with a 30 PSIG PD across it will give readings like he is posting. Been to a few places where the neighbor that "use to do HVAC" topped off the charge. Only by checking suction pressure, not by looking at the whole charge.
beenthere is offline   Reply With Quote
Old 07-29-2012, 04:28 PM   #42
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,567
Rewards Points: 2,814
Default

Adding R-22 increases suction temperature???


Quote:
Originally Posted by psehorne View Post
It is now the hottest part of the day. Head pressure has climbed to 400 PSI. I am removing R-22. Will report back.
You should recover the entire charge. And weight it back in.
beenthere is offline   Reply With Quote
The Following User Says Thank You to beenthere For This Useful Post:
psehorne (07-29-2012)
Old 07-29-2012, 04:44 PM   #43
Member
 
Join Date: Oct 2011
Location: pa
Posts: 4,437
Rewards Points: 2,188
Default

Adding R-22 increases suction temperature???


the op should if he has the equiptment remove all freon...vac the system down weigh in the correct charge ....and start from there.....I think there is to many unanswered questions and reading don't add up... safest way ...
ben's plumbing is offline   Reply With Quote
The Following User Says Thank You to ben's plumbing For This Useful Post:
psehorne (07-29-2012)
Old 07-29-2012, 04:50 PM   #44
Member
 
Join Date: Jul 2012
Location: Texas
Posts: 56
Rewards Points: 75
Default

Adding R-22 increases suction temperature???


Quote:
Originally Posted by turnermech View Post
OP has been adding refrigerant wiht a dirty filter his own statement.
New, clean filter was installed a couple of days ago.
psehorne is offline   Reply With Quote
Old 07-29-2012, 04:54 PM   #45
Member
 
Join Date: Jul 2012
Location: Texas
Posts: 56
Rewards Points: 75
Default

Adding R-22 increases suction temperature???


Quote:
Originally Posted by ben's plumbing View Post
the op should if he has the equiptment remove all freon...vac the system down weigh in the correct charge ....and start from there.....I think there is to many unanswered questions and reading don't add up... safest way ...
Thanks to all of you for your input.

My hangar was burglarized a few months ago. One of the things that was taken was my Promax RG5000. I had not replaced it until today. I have one that will ship to me tomorrow, but I won't have it for several days. So I can't entirely purge the system with what I have on hand. But I can probably bleed it down a bit.

psehorne is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Temperature in junction box buried under R49 insulation (heat detectors/smoke alarm) darlingm Electrical 2 01-16-2012 03:55 PM
Condensation on fiberglass window frame creamaster General DIY Discussions 11 01-05-2012 07:42 PM
caulking old wood windows andyman Windows and Doors 10 12-31-2011 03:39 PM
how to stop condensation on windows? cake General DIY Discussions 7 11-22-2008 12:12 AM
Adding new duct/Register CEbury HVAC 1 06-25-2008 10:51 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.