Originally Posted by ClaudiusB
Most commercial chiller systems are supplied with an internal pressure bypass valve.
Install an adjustable pressure bypass valve at the end of your supply. These adjustable valves will bypass flow from your supply to your storage tank.
My set-up uses a motorized bypass valve which is controlled by a logic controller.
I like more the technical challenge
Supply on the left, return on the right
Thanks for the detailed reply! I am finding all kinds of different ways I could go about this. One is using a check valve with a cracking pressure that allows the recirc to function when pressure is too high. Another is using a pressure switch that basically does the same thing except it actually energizes a solenoid when actuated.
One of the problems I'm finding is knowing what to search for. You said adjustable pressure relief valve. Are you talking something like this: http://straval.com/catlist-relief-valves/CKV-05?
That is what I'd call a check valve.
On your motorized solution - can you explain what is going on there? It sounds like you're doing something like I mentioned above but I'm not quite sure. I tried to search on that Erie component but couldn't find much.
I noticed one other weird thing last night. I hooked up a part of the manifold I showed above last night, except it had one input, and one output and I put a pressure gauge at the end because I wanted to see what the pressure was when the pump was deadheaded and when the output was hooked up to return to the chiller. (The answer was 9 psi when deadheaded and around 3 when not). The weird thing though is it was doing something strange to my pump which is a recirculation pump (has the agitator attached to the bottom to stir the glycol bath). After I shut the chiller off, if I turned it back on the pump wouldn't work. I have to open the top of the chiller, and manually turn the agitator with my hand and that must have freed something up because next time I turned it on all was well. But then next time it would be back to not working and I'd have to do the same thing. So instead of using the manifold I just hooked it up to my immersion chiller to make sure everything is ok and this problem disappeared. So best I can come up with maybe the flow was backing up against the agitator motor and binding it up? I don't know what about that manifold design would cause that unless it had something to do with the pressure gauge.
All help is very much appreciated!