need help! compressor kicking out on high pressure

[SloFuse]

I dealing with a compressor to cool a production area.It has 3 low velosity blowers.It has a big leak.I thought it must be in a blower. I pumped down. Pumped in nitro. I got pressures up to 350 pounds. Thinking i would hear leak in one of blowers. I am charging a drum of r22 every week. I didnt hear anything from blowers. I seen oil leaking out of compressor plate on bottom of compressor under oil glass. I don't see that being my leak, it should be a leak in high side. I don't see any leaks in the sloinoid or exspanion valves. I vacuumed for 2 1/2 hours. opened high side valve to start compressor. low side read 45 lbs. high side 325.It was 85 degrees ambiant temp. high side should been must lower because it way under charged. Has I was charging the high side kept kicking ouy on high temp. I pressure was condensor coil. It is still kicking out on high temp. Did I let nitro in system. Please help!!!!!

[paul pursehouse]

I would suggest the oil glass would be a good place to start,where there is oil there will also be a refrigerant leak

[powell]

The message I get from your post is that you pumped it down probably by closing the king valve on the receiver outlet and then front seating the suction service valve. You did not say you removed the refrigerant.

When you pressure tested the system with nitro using the above method, you would not have included the condenser, receiver and compressor.

As paul stated, where's there oil, there is a leak. You might have air in the system due to the leak on the low side (bottom plate / oil sight glass).

Remove all the refrigerant, find and repair the oil/refrigerant leak, pull a vacumn on the complete system and recharge the system with virgin gas.

[kaelte_technik]

You can use the old fashion way by using soap suds to determined if the oil you see is the area where the leak is.

Would suggest in your next time you do leak test never do a nitro test if there is still refrigerant in the system, possibility it might blend in thru faulty hand valves or by pass in solenoid valves.

[albionharley]

Yep - would deff go for air in the system. And the oil sight glass leaking sounds good to me. Does the compressor ever pull into a vac ? and what is your lp switch set at?

[taz24]

you say you are charging a drum every week.
In the UK refirigerant comes in cylinders of about 10kg, 60kg and then we have what we call a pig that hold 1000kg (a metric tonn).
If you are putting 10kg to 60kg of R22 in the system a week you have a very large leak or lots and lots of smaller leaks.
Does the system normally run on a vacumm. If not then the non condensable is almost definately nitrogen and it has got into the system when you pressureised it, either by a passing valve or a mistake while carrying out the task.
Shut the system down, valve off the condenser and do a standing pressure test to see if you have noncondensables in there.

Cheers taz.

[icecube51]

maybe hill have to try a leakdetector whit colorand.
if there's a leak hill see it whit a fluor lamp.

also try to detect whit lower presion,then the tubes stays normal.

whe test them on one meter watercolum,then whe raise the pressor.

Ice