I have a used spectra ventura 150 that I'm installing, but so far the feed pump
pressure is only going to 50psi (recommended range is 60-90) and the product flow rate is almost 5gph on one side and almost 3gph on the other (both should be over 6gph).
Here's a video of the watermaker
Basically on the 3gph flow side the pressure starts at 50 psi and drops to 40psi. When the clark pump
switches to the other side the flow rate jumps to 5gph and the psi rises from 40 to 50. If I put my ear up to it, I can hear a slight hissing from the clark pump when its on the 3gph stroke.
I tested the feed pump by clamping off the brine discharge and it reached the cutoff level of 125psi and shut off just as it should, so feed pump probably isnt the problem. It also puts out about 1.25 gpm brine discharge with the pressure relief valve closed and 50 psi. I opened the 'test port' and saw about 4 drips per minute coming out. The manual (https://www.sv-zanshin.com/r/manuals...pairmanual.pdf
) says that 1 or 2 drops per minute is ok...I wonder if my 4 drops per minute is really enough to cause this problem (and the slight hissing sound) or if theres something else going on as well.
I have not replaced the old membrane yet. at 50 psi feed pump pressure its making 850-900ppm water
. I wonder if the ppm will drop when the feed pressure issue gets resolved? I have a new membrane available but think it might be best to get everything otherwise running correctly and see how the old membrane does before I install it.
Does anyone have any tips before I crack this thing open and start looking for wear points? Im a bit nervous, but the manual has a pretty good troubleshooting quide starting on page 12 I plan to use as guide. Is there anyone that sells individual parts
for clark pumps? So far I have found a "full rebuild
kit" for $675 and have found a pack which contains only the various o-rings for $110. Theres also an "offshore kit" for $469. I guess my best bet at this point is to hope that the problem is just an o-ring! I'll have to measure some of the o-rings too and see if they seem to be generic sizes available locally (anyone had luck with this?).