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Old 09-15-11, 03:47 PM   #1
Xringer
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Default Sanyo 24KHS72 Mini-Split DIY REPAIR project

This Thread is about repairing a leaky outdoor unit..
See here for details: http://ecorenovator.org/forum/geothe...html#post13279

Foaming at the leak point.


There's the exact spot. (or maybe 4 mm to the right)..


CO2 feed rig. Hey, I got to use my fare tool !! IIRC it was AC Hacker that told
me how to control the flow rate of the inert gas required for brazing copper.
I just cracked the valve, so the bubble rate on the output side was very slow.
If the flow rate was too high, the pressure inside the tube would blow the
filler metal out of the hole, I was trying to patch..
I also want to thank the guys who told me CO2 could be used instead of Nitrogen.


Wet Wrapped. (Find the words, Back Here!). The Brown backgound is a sheet metal plate, to prevent heat damage.
I used absorbent cotton strips to protect the compressor (and other parts),
to keep the heat from traveling down the tube and melting stuff..


Getting ALL the air out. (Ran it like this for 30 minutes, before lighting the torch).


Messy stuff!! This area was starting to glow cherry red and the filler stick started melting. When it got really liquidy, I pulled back the flame. One of those metal Drops formed
on the bottom of the tube, the second it really started to flow. MAPP gas works okay!



Out of Nitrogen (too far to drive), so I filled it to 400 PSI with dry SCUBA air.
(Air has been leaking into the system for months anyways).

It held pressure very well. I checked the messy repair area with my stethoscope, and heard no hissing at all..
(I had used a crude listening tube to discover the location of the leak).
It held 400 PSI for an hour. I buttoned it up with 350 PSI, so I can go back
and check it next week..
I tie-wrapped the thermistor back on the tube, right above the compressor.

If the pressure holds, I guess the next step is to vacuum out the system..
I've never done one of these, (just line-sets) I wonder if there are any special precautions needed.?.

After it's all tested, it will need to be charged up with refrigerant..
Then, placed in long term storage (as a back-up), or put to use ASAP.?.

My two use-it choices are shown here:
http://ecorenovator.org/forum/geothe...html#post15381

Cheers,
Rich


Last edited by Xringer; 09-15-11 at 11:43 PM..
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