Another advantage of buying a Harvest Right freeze dryer on their website is all the information about the dryer itself. It’s highly unlikely that an employee at Home Depot knows more about freeze dryers than the FAQ and blog sections of Harvest Right’s website, which their engineers write.
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Reattached hose and ran another full system test (results, 750 mTorr lowest steady reading - looking through the oil level window, some bubbling seen in oil even after an hour of pumpdown - some "air" noises from pump)
Do you have any vacuum gauges at all to test the pump? ( Though I doubt that is the problem based upon your tests )
Reinstalled the vacuum hose and capped far end of hose to do a hose test. (same results as pump alone)
Question for you: I'm impressed by the shortening of cycle times. Obviously some of that is from the improvement in insulation on the lines, etc., but I'm wondering how much of it might be from "drying out" of the insulation and outer walls of the freeze drying chamber.
Harvest Right’s large Pharmaceutical is the solventless’s industry standard freeze dryer for a reason: they’re affordable, can dry a lot of hash in 24 hours, and are easy to set up. We sell more of them than just about anyone else in the industry to hash makers everywhere.
A bit of background on me - I used to work in a sold state fabrication lab (university research lab) and had a lot of hands-on work with ultra-high vacuum equipment. The pumping we do for freeze drying was what was required to just start
The evaporator coils that touch the surface of the stainless steel vacuum chamber reach about -42 F. With food in the chamber and because the location of the thermister is on the middle shelf of the four shelves, the temperature it records is going to range from -25 to -30 F in the nove hour default freeze time. This temperature is very adequate for freeze drying the food.
When isolated, the pump seems to behave well. Short of putting a meter on the pump, my impression is that it is operating properly. I'm considering investing in a good meter to verify that it is reaching a good ultimate vacuum.
"There comes a time in every project when you have to shoot the engineer and start production." -- author unknown
But Electrolux provides a so-so status for customer service. Electrolux aid is basically alright. If you live beyond An important metropolitan space, finding someone who can restore your device may be harder.
Learn the value of drying foods at home, the nutrition that you will have from dried foods, and how to set yourself up for success Buy Now while drying.
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