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post #11 of 35
5/22/11 at 2:03pm
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Any links to info on phase change parts,supplies,techniques? My speciality is auto AC, might as well see if I can work something out on my last i7.Perhaps we have a sub-forum here,I never noticed.

EDIT: I see I am in the phase change section already,doh
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post #12 of 35
5/22/11 at 3:55pm
  • NoL
  • Extreme Cooler
That's the max pressure it was tested to, as in the burst pressure. Most of our systems run between vacuum and 10 psi, so 15 might really have been fine. I suggest you measure the amperage of the compressor while it's at load and compare to manufactures PDF or get around to measuring the high side pressure. You have produced a blind charge.
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post #13 of 35
5/22/11 at 6:25pm
Thread Starter 
Quote:
Originally Posted by NoL View Post
That's the max pressure it was tested to, as in the burst pressure. Most of our systems run between vacuum and 10 psi, so 15 might really have been fine. I suggest you measure the amperage of the compressor while it's at load and compare to manufactures PDF or get around to measuring the high side pressure. You have produced a blind charge.
Everything I've read about frost on suction lines meant low pressure though...Is that not true?
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post #14 of 35
5/22/11 at 6:44pm
Quote:
Originally Posted by WildcatWhiz View Post
Everything I've read about frost on suction lines meant low pressure though...Is that not true?
no its the opposite
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post #15 of 35
5/22/11 at 7:39pm
Thread Starter 
Quote:
Originally Posted by Sdumper View Post
no its the opposite
WHAAAAAAT?! Frost on suction lines means high pressure? I've heard:

a.Too low refrigerant charge can for a while creates frost/ice on the suction line; however, after a while the frost/ice should go away when there is little or no refrigerant.

Refrigerant must flow to the evaporator coil for the system to work correctly. If the refrigerant is too low, it can cause the cooling coil to become too cold or freeze the suction line. Low refrigerant can also cause the air conditioner to stop cooling air altogether.

Frost Back: A condition in which liquid refrigerant may be flowing from the evaporator into the suction line. It's usually indicated by sweating or frosting of the suction line.

That's all from some quick Google searches...Somebody please set me straight here.
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post #16 of 35
5/22/11 at 8:46pm
  • NoL
  • Extreme Cooler
You had frost back, which is normal in our systems.
What you were reading applies only to AC units, where you don't necessarily want frost as you are lowering the temperature of air not a medium like a water chiller where the goal is to go cold.
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post #17 of 35
5/22/11 at 9:16pm
Thread Starter 
Quote:
Originally Posted by NoL View Post
You had frost back, which is normal in our systems.
What you were reading applies only to AC units, where you don't necessarily want frost as you are lowering the temperature of air not a medium like a water chiller where the goal is to go cold.
Poop. I guess I need to take some refrigerant back out...

Isn't this an A/C unit of sorts?
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post #18 of 35
5/22/11 at 10:44pm
  • NoL
  • Extreme Cooler
No it's not conditioning air
I would before pursueing further actions, attempt to check the system state by checking the high side and taking readings of superheat/subcooling.
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post #19 of 35
5/23/11 at 1:00pm
Thread Starter 
Quote:
Originally Posted by NoL View Post
No it's not conditioning air
I would before pursueing further actions, attempt to check the system state by checking the high side and taking readings of superheat/subcooling.
I don't think I can check the highside as there is not port...

How do I take readings of the superheat/subcooling?

Thanks so much for all of the help!
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post #20 of 35
5/23/11 at 9:54pm
  • NoL
  • Extreme Cooler
Can't really do any of it properly without a high side pressure.
Let's see.

What temperature is the condenser out line. So post compressor, post condenser.
How hot is the compressor shell?
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