EcoRenovator - View Single Post - #2 Sanyo 24KHS72 AC/HP Install Project (Oct 2011)

Xringer · 10-15-11, 06:07 PM

After raining Thursday & Friday, the sun came out this morning. (for a while)!

I was sure the 15' line-set was going to be too short, so I moved the ODU 16" left.
Installing the line-set went faster than expected, since the aluminum tube bends pretty easily.
I put in the filter-drier, so we could clean out the system right after vacuuming.

When I removed the shipping cap on the 5/8" valve (it caps the line-set connection),
I got a small puff of gas, indicating there was a small amount of valve leakage.
(From inside the ODU to the line-set, with the valve closed).

This caused me to do two things differently.
1. Pressure testing cut to 1/2 hour at 300 PSI.
2. Not attempting to achieve 200 microns of vacuum. (Since the R410A leak would screw it up).

It must have been getting warmer outdoors, because the nitrogen pressure increased from 300 to 305 PSI.

The vacuum pump ran for over an hour before getting down to 500 microns.
I could shut off the pump for 5 minutes and would see very little change.
When I tried to get down to 400, it would get close then bubble back up 450-490 microns.
It was kinda erratic. I assumed this was due to R410A leaking past the large valve.
My R410A certified HVAC buddy said I was probably right.

So when it dipped down near 400, we released the refrigerant and shut the service port cut-off.
(And shut off the vac pump).

I connected the T-Run jumper and we got a smooth two hour cooling run.
I wanted to run it longer, but my HVAC Dude wanted to go home.
Maybe, the filter picked up any floating junk and dried out any H2O
that may have been in the charge. I think longer would have been better.

This pic is a video, click on it to play it..

During this test, line set (and IDU) temperatures dropped to -20 F..

After the we did the pump-down (worked perfectly again).
Removed the dirty filter. Re-vacuuming was much quicker this time.
There must have been a lot of moisture in the system, during the first vac.
We got the same bubbling vac level at 450-490 microns again.
We flooded the line-set and I removed the T-run Jumper, re-connected
the 4-way valve and buttoned up the box, as it started to rain again!!

Heating and cooling functions seem normal. No sign of trouble so far.

This thing might actually work!!!

Cheers,
Rich

10-15-11, 06:07 PM	#18
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Day 5 After raining Thursday & Friday, the sun came out this morning. (for a while)! I was sure the 15' line-set was going to be too short, so I moved the ODU 16" left. Installing the line-set went faster than expected, since the aluminum tube bends pretty easily. I put in the filter-drier, so we could clean out the system right after vacuuming. When I removed the shipping cap on the 5/8" valve (it caps the line-set connection), I got a small puff of gas, indicating there was a small amount of valve leakage. (From inside the ODU to the line-set, with the valve closed). This caused me to do two things differently. 1. Pressure testing cut to 1/2 hour at 300 PSI. 2. Not attempting to achieve 200 microns of vacuum. (Since the R410A leak would screw it up). It must have been getting warmer outdoors, because the nitrogen pressure increased from 300 to 305 PSI. The vacuum pump ran for over an hour before getting down to 500 microns. I could shut off the pump for 5 minutes and would see very little change. When I tried to get down to 400, it would get close then bubble back up 450-490 microns. It was kinda erratic. I assumed this was due to R410A leaking past the large valve. My R410A certified HVAC buddy said I was probably right. So when it dipped down near 400, we released the refrigerant and shut the service port cut-off. (And shut off the vac pump). I connected the T-Run jumper and we got a smooth two hour cooling run. I wanted to run it longer, but my HVAC Dude wanted to go home. Maybe, the filter picked up any floating junk and dried out any H2O that may have been in the charge. I think longer would have been better. This pic is a video, click on it to play it.. During this test, line set (and IDU) temperatures dropped to -20 F.. After the we did the pump-down (worked perfectly again). Removed the dirty filter. Re-vacuuming was much quicker this time. There must have been a lot of moisture in the system, during the first vac. We got the same bubbling vac level at 450-490 microns again. We flooded the line-set and I removed the T-run Jumper, re-connected the 4-way valve and buttoned up the box, as it started to rain again!! Heating and cooling functions seem normal. No sign of trouble so far. This thing might actually work!!! Cheers, Rich Last edited by Xringer; 10-13-13 at 12:23 PM..