Jebao DCP-3500 Flow Rate

[Frank804]

Hello everyone. I'm in the process of setting up a Red Sea Reefer 350 with a Jebao DCP-3500 return pump. Can anyone advise as to the correct control flow setting on the controller that is needed for 790gph? The "instruction manual" that came with the pump isn't worth the paper it's printed on, and I want to be as accurate as possible.

Thanks in advance.

 

[Water Dog]

Are you trying to push 790 gph into the tank? The pump is rated at 925 gph at max head height of 11.5 ft. If that’s the case, then after head pressure loss, I doubt you’ll be able to push 790 gph into the tank even with the pump maxed out at 100%.

 

[Frank804]

Are you trying to push 790 gph into the tank? The pump is rated at 925 gph at max head height of 11.5 ft. If that’s the case, then after head pressure loss, I doubt you’ll be able to push 790 gph into the tank even with the pump maxed out at 100%.

Yes. 790gph into the tank. The head height is 4.5 ft. Is it still doable?

 

[Water Dog]

Without a flow meter, it’s tough to tell. What you can you is a bucket test... Fill up the sump, then put a 5 gallon bucket beneath the output in the tank and see how long it takes to fill up. With that, you’ll be able to calculate an accurate flow rate.

After head height loss, I do doubt that the DCP 3500 pump will actually push 790 gph into the tank though. Remember,you have to add an additional foot of headless for every 90 degree elbow in the return line as well.

 

[Beau_B]

I had the 3000 (25W @ 855gpm) a similar size tank with a “800gph overflow.” I could run at 100% but I eventually found running it reduced (21W) was best.

The 3500 is 28W @ 925gpm. I’m going to guess somewhere around 75% is going to be most pleasing even if it isn’t the system’s designed rate.

Plug it in and try it. The sound and water height over the weir will tell you what speed is best.

 

[prdubois]

The pump at full open and no head pressure will give 3500lph = 925gph
Pump is supposed to have 8 speeds.
Low should be 277gph
Max is 925gph
90% is 832gph. Using about 4 to 5 ft of head pressure I would use one or two speeds down from full

 

[Frank804]

I had the 3000 (25W @ 855gpm) a similar size tank with a “800gph overflow.” I could run at 100% but I eventually found running it reduced (21W) was best.

The 3500 is 28W @ 925gpm. I’m going to guess somewhere around 75% is going to be most pleasing even if it isn’t the system’s designed rate.

Plug it in and try it. The sound and water height over the weir will tell you what speed is best.

Thank you for the reply. I will make the adjustments and see what happens.

 

[Frank804]

The pump at full open and no head pressure will give 3500lph = 925gph
Pump is supposed to have 8 speeds.
Low should be 277gph
Max is 925gph
90% is 832gph. Using about 4 to 5 ft of head pressure I would use one or two speeds down from full

Thanks for the reply. I'll give it a shot.

 

[Frank804]

I had the 3000 (25W @ 855gpm) a similar size tank with a “800gph overflow.” I could run at 100% but I eventually found running it reduced (21W) was best.

The 3500 is 28W @ 925gpm. I’m going to guess somewhere around 75% is going to be most pleasing even if it isn’t the system’s designed rate.

Plug it in and try it. The sound and water height over the weir will tell you what speed is best.

I'll give it a try. Appreciate the reply.

 

[Water Dog]

The pump at full open and no head pressure will give 3500lph = 925gph
Pump is supposed to have 8 speeds.
Low should be 277gph
Max is 925gph
90% is 832gph. Using about 4 to 5 ft of head pressure I would use one or two speeds down from full

If 90% is 832 at 0 head head height, how will going one or two speeds down from full achieve the OP’s desired 790 gph into the tank at 5 feet of head height?

 

[prdubois]

As you said: "Without a flow meter, it’s tough to tell. " I ran one with very little head loss at 4'
SO.. I was saying to check it at 80% to 90 % to see if that does it.

 

[Thaxxx]

Don't worry about numbers.
Just set it at what runs best with your plumbing situation. No ones plumbing is the same as yours, so there is no right answer.

 

[Water Dog]

I will say... you don’t need 10x turnover in your tank. 3x to 4x turnover is ideal IMO.

 

[Water Dog]

By the way, head height matters...

Here’s Vectra S1 rated at 1400 gph reading 250 gph on a Red Sea Reefer tank, similar plumbing, similar head height as the OP.

Apex reporting return flow at 250gph with a Vectra S1 return pump

So are these Vecta pumps extremely over rated or do the flow meters restrict flow by a fair amount? I just setup my new Vectra S1 with a 1in flow meter on a reefer525 and apex is reporting a max GPH of 252... This flow report on a 140gal tank is causing me concern. I've adjusted the FMM to...

www.reef2reef.com

 

[Saltyreef]

By the way, head height matters...

Apex reporting return flow at 250gph with a Vectra S1 return pump

So are these Vecta pumps extremely over rated or do the flow meters restrict flow by a fair amount? I just setup my new Vectra S1 with a 1in flow meter on a reefer525 and apex is reporting a max GPH of 252... This flow report on a 140gal tank is causing me concern. I've adjusted the FMM to...

www.reef2reef.com

Thats what she said

 

[Water Dog]

Thats what she said

Well played!