pump suggestion

[sphelps]

The only head pressure will be from pipe friction so something rate at about 900gph will be perfect, just use a little bigger pipe if possible

[lastlight]

You think an eheim 1262 will do it?

If realistically I only have to worry about the head loss from the chiller I'd agree...if it turns out to be more than just the chiller head loss that pump won't be enough.

1262 is 80w and while they aren't very efficient these days they are reliable. The mag 12 is more flow in case there really is more head loss than just the chiller... but is 110W.

[PoonTang]

If possible why not just plumb it into the sump return pump?

[lastlight]

My sump return is actually an eheim 1262. I really have my doubts it could pump down into the chiller and out and maintain the 500 gph the chiller needs. Also I don't want to lower the turnover in the display. That'd be the head loss with the chiller plus more than 2m climb. Be lucky to get a trickle out of it I think.

[abcha0s]

Originally Posted by lastlight

My sump return is actually an eheim 1262. I really have my doubts it could pump down into the chiller and out and maintain the 500 gph the chiller needs. Also I don't want to lower the turnover in the display. That'd be the head loss with the chiller plus more than 2m climb. Be lucky to get a trickle out of it I think.

I agree with that. If your planning to use a 1262, it would have to be an additional one.

[abcha0s]

I think the closed loop principal would apply.

I think a 1262 would be enough. I don't think it's critical that the flow through the chiller is exact. I think they specify the optimal flow for maximum efficiency, but it would be difficult to match it exactly.

The other thought that I had is that the recommended flow through the chiller probably has something to do with the internal temperature sensor. If you configure the set point a little lower on the chiller and use your Ranco, it might be fine to run with a lower flow rate.

- Brad

[lastlight]

I think I will try and acquire another 1262 to at least give it a shot.

What does the set point do exactly? I haven't had a chance to read through the booklet yet lol. I want the thing to come on at 80 and cool until the tank is 79. Is 80 the set point?

I think I also read about people blowing fuses like crazy when the flow through the unit was not sufficient?

[abcha0s]

That is the set point I am referring to. I forget the details, but you also set the variance. The chiller is more efficient with a larger variance. I don't think it likes the constant on/off duty. They do explain it in the manual.

If your using an external temp controller, I would make sure that you don't set it to turn on and off too frequently. With the apex you can control temp to within +/- 0.2F - However I think that would be a bad idea. I think the minimum the chiller permits is +/- 0.5F

[lastlight]

Oh yeah I see. The ranco works with 1 degree F increments for the sensitivity.