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Lochinvar Knight WHB085 + Taco VR3452-FC1A01 (0-10v input) Boiler Pump
tuffcalc
Member Posts: 35
Hi everyone,
Installing a Lochinvar WHB085. All the literature states that it comes with a variable speed ECM boiler pump with 0-10v input (so the Lochinvar can control it's speed) for the primary loop. Unfortunately when the WHB085 arrived it had a standard non-ecm grundfos pump in the box. Called Lochinvar and they told us only the euro versions come with the ECM pump. Anyway, here we are.
I went on a mission to find an ECM pump with 0-10v control input. Looks like the smallest ecm pump I could find that supports 0-10v input from a boiler is a mid-sized Taco VR3452-HB1-FC1A01. The submittal sheet shows a pump curve that needs at least 2 feet of head to pump 1 GPM (https://s3.amazonaws.com/s3.supplyhouse.com/product_files/Taco-VR3452-HB1-FC1A01-Submittal.pdf)
Called Taco to see if the pump would work at those low rates. They said they didn't know.
My alternative is using a standard variable voltage pump like the Taco 007-VVF5, but again, no guarantees from Taco that it will pump at super low GPMs.
Anyone have any suggestions or experience in a similar situation? Should I try the VR3452, or return it and go with the 007-VVF5?
Installing a Lochinvar WHB085. All the literature states that it comes with a variable speed ECM boiler pump with 0-10v input (so the Lochinvar can control it's speed) for the primary loop. Unfortunately when the WHB085 arrived it had a standard non-ecm grundfos pump in the box. Called Lochinvar and they told us only the euro versions come with the ECM pump. Anyway, here we are.
I went on a mission to find an ECM pump with 0-10v control input. Looks like the smallest ecm pump I could find that supports 0-10v input from a boiler is a mid-sized Taco VR3452-HB1-FC1A01. The submittal sheet shows a pump curve that needs at least 2 feet of head to pump 1 GPM (https://s3.amazonaws.com/s3.supplyhouse.com/product_files/Taco-VR3452-HB1-FC1A01-Submittal.pdf)
Called Taco to see if the pump would work at those low rates. They said they didn't know.
My alternative is using a standard variable voltage pump like the Taco 007-VVF5, but again, no guarantees from Taco that it will pump at super low GPMs.
Anyone have any suggestions or experience in a similar situation? Should I try the VR3452, or return it and go with the 007-VVF5?
0
Comments
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The Lochinvar 399's come with a 0-10 vdc circ. It is a Grundfos, I don't remember the model number.
2 ft of head is not very much. You could put in a balancing valve after the circ to give it a little extra resistance.
"If you can't explain it simply, you don't understand it well enough"
Albert Einstein0 -
These are smaller than VR3452 . 008 is used in many 1-10v applications .
http://www.tacocomfort.com/products/water_circulation_pumps__circulators/wet_rotor_circulators/_variable_speed_variable_voltage_00_circulator/index.htmlYou didn't get what you didn't pay for and it will never be what you thought it would .
Langans Plumbing & Heating LLC
732-751-1560
Serving most of New Jersey, Eastern Pa .
Consultation, Design & Installation anywhere
Rich McGrath 732-581-38330 -
> @Rich_49 said:
> These are smaller than VR3452 . 008 is used in many 1-10v applications .
>
> http://www.tacocomfort.com/products/water_circulation_pumps__circulators/wet_rotor_circulators/_variable_speed_variable_voltage_00_circulator/index.html
Yes, but these aren’t ECM.0 -
Yes, just trying to make sure I can meet minimum flow rates - so that the boiler can take advantage of its entire range of modulation for both the pump and burner.Gordy said:I know it doesn’t answer your initial question, but what is it you are trying to achieve with the 2’ of head @1 gpm?
Sounds like you are trying to meet the minimum flow rate requirement for that boiler. That’s a tough nut to crack.0 -
I apologize for the recommendation . I was unde the impression that you'd be maintaining min flow through boiler . Did not realize you just wanted to save 2.50 year on electric .tuffcalc said:> @Rich_49 said:
> These are smaller than VR3452 . 008 is used in many 1-10v applications .
>
> http://www.tacocomfort.com/products/water_circulation_pumps__circulators/wet_rotor_circulators/_variable_speed_variable_voltage_00_circulator/index.html
Yes, but these aren’t ECM.
You didn't get what you didn't pay for and it will never be what you thought it would .
Langans Plumbing & Heating LLC
732-751-1560
Serving most of New Jersey, Eastern Pa .
Consultation, Design & Installation anywhere
Rich McGrath 732-581-38330 -
All good. If you read my original post you will see that I already considered the 007-VVF. Like I said, Taco would not confirm of any of their VVF pumps would also pump very low flow (like 1 GPM/min).Rich_49 said:
I apologize for the recommendation . I was unde the impression that you'd be maintaining min flow through boiler . Did not realize you just wanted to save 2.50 year on electric .0 -
The boiler will take advantage of its full modulation range. As far as getting in the weeds with a 1gpm flow rate you will need a stable load at that 8.5k low end. So hopefully you are not micro zoning.tuffcalc said:
Yes, just trying to make sure I can meet minimum flow rates - so that the boiler can take advantage of its entire range of modulation for both the pump and burner.
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@tuffcalc Did you end up getting answers for Taco VR3452-HB1-FC1A01? Assuming you installed this unit - how is it working for you?0
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Check out the Armstrong Compass H 20-20. It claims a 0-10VDC input.
https://armstrongfluidtechnology.com/~/media/documents/sales-and-marketing/solution-outlines/10-192-compass-h-solutionoutline.pdf?la=en&display=10 -
I installed it but it was too big a pump for my needs. I installed an Armstrong Compass instead. No issues with it.AlexZavgorodni said:@tuffcalc Did you end up getting answers for Taco VR3452-HB1-FC1A01? Assuming you installed this unit - how is it working for you?
After using the WHB/WHN boiler for about a year, I've learnt it runs best with about 20degree delta T pumping about 10gpm through the boiler. Higher delta Ts work but the boiler sometimes makes funny noises - so I backed it off.0
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