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Author Topic: gpm to shoot for  (Read 3906 times)

peeworm

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Re: gpm to shoot for
« Reply #15 on: September 09, 2013, 05:51:13 AM »

Thanks for the replys and help guys. I also wonder if maybe a bell and gossit nrf 22 might get a little more gpm. I have 3 new pumps I ordered the boiler with the small pump setup then ordered the b&g as a back up and I also wanted to try the grundfos as the primary.
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Scott7m

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Re: gpm to shoot for
« Reply #16 on: September 09, 2013, 07:12:43 AM »

I guess that was perhaps not worded properly, sorry Scott, I hear people at the shows all the time speaking about running their boilers at 160 and below to try and save wood, in my opinion this is not a good idea as it promotes condensation within the boiler, I would far sooner see much higher water temps, this helps control condensation and creosote which we all know leads to premature corrosion inside the boiler. My friend Dave that sold the other brand boiler at Acton fair says that his factory aquastat will only go as high as 180, honestly I can't understand why a manufacturer would want to keep the temp so low. the aquastat is a love control and I know that the parameters can be adjusted, do you know if this would void any warranties as he will be doing the Rochester NH. show with me as well and we feel that we would like to turn it up.

It shouldn't void the warranty I don't think

Hell have to get past the pass code though


Empyre corrects delta issues with there optimizer system

If they were just sized properly to start with though it wouldn't matter
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peeworm

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Re: gpm to shoot for
« Reply #17 on: September 15, 2013, 05:53:05 PM »

It s not cold here yet but i have 190 degree water dumping into water heater and when I run the hot water and check my thermostat on the return it is showing about 160 so I am dropping about 30 degrees thru my w to w exchanger.
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Earth Outdoor Wood Furnaces Rancher 365
1990 Ford F250 4x4 IDI diesel
Huskee 22 ton splitter
Husky 460 rancher
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1215 Massey Ferguson 4x4 tractor with fel

Scott7m

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Re: gpm to shoot for
« Reply #18 on: September 16, 2013, 08:09:46 AM »

How r u checking it?  R u using the temp at the stove and checking it after the exchanger with something else
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willieG

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Re: gpm to shoot for
« Reply #19 on: September 16, 2013, 08:43:56 AM »

if your readings are correct, i would guess your gpm delivery from the OWB is too low. the reason i am unsure. if yoru plate exchanger is at least a 20 plate, flow reduction is almost nil. \\your water to air exchanger should not restirct things too much either i wouldnt think,unless it is partially plugged or way to small.  i really tink you need to find your flow rate and go from there. i think someone suggested another pump in series?
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peeworm

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Re: gpm to shoot for
« Reply #20 on: September 16, 2013, 09:11:48 AM »

I have thermostats on the line before the w to w and after the w to air that I bought from pex supply that fit the gator bite t's. By the way im using the read out on the aquastat at the boiler. All componets of system are new the w to w ex is 30 plate with 1 1/4 inlet and outlet and the w to a is a new 20 By 20 with fan from andersons outdoor wood furnace center.
« Last Edit: September 16, 2013, 09:21:28 AM by peeworm »
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Earth Outdoor Wood Furnaces Rancher 365
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Huskee 22 ton splitter
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Scott7m

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Re: gpm to shoot for
« Reply #21 on: September 16, 2013, 05:28:36 PM »

If readings are accurate the delta is to high already with just water being heated
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RSI

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Re: gpm to shoot for
« Reply #22 on: September 16, 2013, 05:36:59 PM »

Did you say you are using a Grundfos Alpha? If so, what GPM is it displaying?
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peeworm

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Re: gpm to shoot for
« Reply #23 on: September 16, 2013, 06:10:54 PM »

It is showing 5 gpm
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Earth Outdoor Wood Furnaces Rancher 365
1990 Ford F250 4x4 IDI diesel
Huskee 22 ton splitter
Husky 460 rancher
Poulan Pro 255
1215 Massey Ferguson 4x4 tractor with fel

RSI

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Re: gpm to shoot for
« Reply #24 on: September 16, 2013, 09:09:18 PM »

I would just keep an eye on it for a while and see how low it drops when the supply temp is lower.

The NRF22 will give you less flow than the Alpha. You would need an NRF25 to get a little more.

Since you already have the NRF22, if it can be done fairly easy on your system, I would add it inline with the other pump. It should give you another couple gpm. It could be setup to come on when needed so only the Alpha runs 24/7 if you want to keep the power usage down.
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