Plugged cap tub

[Galt]

I'm back Cooler has no high side access but I was adding refrg. To see what happens it was becoming obvious the tube was plugged when it let go now there's way to much refrig.so took some out and it worked fine for a while then did it again so I evacuated well and added a filter drier so far so good.

[NiHaoMike]

What this guy said. When I read MP39, I guessed R12 system with MO. If it was a POE system with 134a I would've suspected it that as more likely.

Very good SUPCO article on capillary clogging here:
http://www.supco.com/images/pdfs/Man...g%20Manual.pdf

Good article but use nitrogen, not air for testing cap tubes. Even if the air is super dry, the oxygen in it can oxidize the oil.

[UmmScott]

On a system with restricted cap tube after your compressor starts you will typically see a spike in head as the evap is cleared then the head will drop as the refrigerant stacks up in the condenser and there is less gas coming through the suction side. When you are low on charge you generaly do not see the same head spike. I agree with the others with vacuum on the low side will not always indicate a low charge. These would be the guys that over charge a restricted cap tube to get the suction up when total charge is not weighed in vs topping off.

x2..

also if you equalized both sides with your gauges then if it was a restriction you would get the "static" u were looking for correct?

I had a reach in cooler and I was down to "low or restriction"...so i shut it off, pressures very very slowly equalized, i let them equalize thru my gauges and the static actually appeared normal given set conditions. I started her up. Head jumped way up...275 but then suction started dropping..30, 20, 10, 2. and then head came down with it so I'd say this is another good indicator

[Jaris]

This is the type of system you can actually use your subcooling reading to tell you something.

[UmmScott]

This is the type of system you can actually use your subcooling reading to tell you something.

subcooling..?? Whats that?

[VTP99]

subcooling..?? Whats that?

what they cool subs with ?

[Moonray]

I like my subs hot! No subcooling for me!

[lytning]

Think he meant submarines ?

I like my subs hot! No subcooling for me!

[Moonray]

Think he meant submarines ?

Oops! My bad!

[VTP99]

Hey ! 110 - 220 whatever works