Do you do resi work pr0duct? I ask this because I know if we have resi customers that want the whole system changed out over a bad heat exchanger. We end up with a lot of good condensers sitting around in our scrap yard. If you have a similar situation maybe you could get a evap barrel and txv and make some chillers like that for additional load. Like the previous poster said get a tank if it doesn't have one. Just get the chiller you have now up to snuff and add some homemade helpers to the tank.