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AC_Hacker · 01-28-13, 03:26 PM

Yesterday I attempted a pump down, and never even achieved 1 psi difference from atmospheric pressure.

At first I though that my Little Wonder (wonder how long this little thing will last?) vacuum pump I bought from the local Chinese Tool Store had left the world... but a test of it shows it to be working just as it should be.

So now I need to find the leak... maybe there's a bullet hole in the heat pump after all.

I'm thinking of blowing some compressed air into the system... that would at least give me some hiss noise to help localize the leak... then I could use soap bubbles to locate the exact spot.

This is also bringing into question the oil in the system, as it has been open to air for as few as three and as many as five years.

-AC

01-28-13, 03:26 PM	#37
AC_Hacker Supreme EcoRenovator Join Date: Mar 2009 Location: Portland, OR Posts: 4,004 Thanks: 303 Thanked 723 Times in 534 Posts	Maybe There's A Bullet Hole After All... Yesterday I attempted a pump down, and never even achieved 1 psi difference from atmospheric pressure. At first I though that my Little Wonder (wonder how long this little thing will last?) vacuum pump I bought from the local Chinese Tool Store had left the world... but a test of it shows it to be working just as it should be. So now I need to find the leak... maybe there's a bullet hole in the heat pump after all. I'm thinking of blowing some compressed air into the system... that would at least give me some hiss noise to help localize the leak... then I could use soap bubbles to locate the exact spot. This is also bringing into question the oil in the system, as it has been open to air for as few as three and as many as five years. -AC __________________ I'm not an HVAC technician. In fact, I'm barely even a hacker...