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MikeSCV
07-22-2016, 04:21 PM
Hey everyone just running a scenario by you. A good man 3 ton package unit(pgb036050) is not cooling. Low side is about 70 high side is 245 and fluttering, it's about 109 on the roof at 4:00 with the unit running all day.With a 92 return and 89 supply, duct work is newer and seems to be intact. I didn't get wet bulbs or temperature on the lines. What are some of your thoughts?

jacob-k
07-22-2016, 04:45 PM
I think the unit might run for days straight with that temp split. What did you do to try and fix it? or diagnose it?

TechmanTerry
07-22-2016, 04:54 PM
109*F on the roof is about a 310psi head, so maybe lo on freon?

kdean1
07-22-2016, 05:34 PM
Don't add Freon to an R410-A system. That will make things worse.

MikeSCV
07-22-2016, 05:35 PM
Hey Terry I was thinking that at 1st, but I do get a bit of temp split... What do you think of a restriction or bad compressor valve? Do you ever see the high side fluttering?

vin lashon
07-22-2016, 06:47 PM
Don't add Freon to an R410-A system. That will make things worse.

It's an R-22 system.

mrkelly
07-22-2016, 06:48 PM
Don't add Freon
Guess you haven't heard,
"It's Back".

Your Low.
Terry pegged it.
Really? 109 and your NOT 'close to at 'least' 280/90 on 22.

vin lashon
07-22-2016, 06:58 PM
70/245 with a 92* return and 109* ambient? I would add refrigerant. If you're concerned about overcharging, you could recover and weigh the charge back in as per the name plate. A leak detector could confirm.

vin lashon
07-22-2016, 07:36 PM
PGB036050 (http://www.alpinehomeair.com/viewproduct.cfm?productid=453055317&displaytab=instructions_brochures)

mrkelly
07-22-2016, 10:34 PM
92 & 109 would = about 100 & 400.
:grin2:

MikeSCV
07-23-2016, 12:50 AM
I would love to get temperatures on both lines,do any of the pros have a good way of connecting the clamp other than taking fan off and threading the line through the ele cabinet?
Also what are some good ways of testing if this is a restriction? Some said you can cover the condensing coil

MikeSCV
07-23-2016, 12:57 AM
Also what is that high side fluttering?

vin lashon
07-23-2016, 01:03 AM
Also what are some good ways of testing if this is a restriction? Some said you can cover the condensing coil

SC & SH. I would try adding refrigerant. If you weigh it in, you can remove the same amount if needed. You can get creative with the clamp lines, including drilling holes in the access panel and using test plugs to seal them afterwards. Or leave gap in panel, snake through the panel, using rubatex to pad, etc.

You're just asking for speculation until you provide complete info, i.e., readings and measurements. Low SH can indicate overcharge or airflow, High SH can indicate restriction. SST...just the standard readings can tell much. Include idwb, oat, TS, etc. Piston? All we have to go on atm are some pressures and a few 'maybe' temps.

Have you or anyone else done any work on this unit in recent times?


Also what is that high side fluttering?

https://encrypted.google.com/search?q=r-22+high+side+flutter

TechmanTerry
07-23-2016, 03:29 AM
When checking the SH&SC, why do you have to gain access to the inside of the CU? The SL&LL just outside of the CU is not OK for testing SC&SH??

MikeSCV
07-23-2016, 01:37 PM
When checking the SH&SC, why do you have to gain access to the inside of the CU? The SL&LL just outside of the CU is not OK for testing SC&SH??

I must have missed it then, which side was it on?

vin lashon
07-23-2016, 01:46 PM
When checking the SH&SC, why do you have to gain access to the inside of the CU? The SL&LL just outside of the CU is not OK for testing SC&SH??

It's a package unit.