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Author Topic: Heatmaster wf4000 with pump issues  (Read 6781 times)

johnmn

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Heatmaster wf4000 with pump issues
« on: March 09, 2019, 05:51:57 AM »

I wasn't sure if I should post this here or in the plumbing section. Thought it might get more traffic here.
Anyway, first year on my wf 4000 I have 50' of underground with a 5' rise and an additional 50' of pipe ran through garage and crawl space. Through a filter, heat exchange in furnace then plate exchanger for domestic hot water and back to the furnace. Running a taco 011 pump through 1" pex. Question/problem is first pump lasted 5 months, second pump was locked up yesterday only after 1 month! I got it going again and seems to be working fine but for how long? Yes pump motor is horizontal and my filter is 90% clean. My dealer is worthless as far as help goes.
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johnmn

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Re: Heatmaster wf4000 with pump issues
« Reply #1 on: March 09, 2019, 06:02:16 AM »

Oh I took the first pump apart and inside was clean as a whistle. No scale, rust nothing.....
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RSI

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Re: Heatmaster wf4000 with pump issues
« Reply #2 on: March 09, 2019, 06:46:11 AM »

Where is the pump located?
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johnmn

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Re: Heatmaster wf4000 with pump issues
« Reply #3 on: March 09, 2019, 06:57:04 AM »

Back of boiler, inside the access door
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RSI

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Re: Heatmaster wf4000 with pump issues
« Reply #4 on: March 09, 2019, 07:08:16 AM »

Is the pump on the bottom supply port?
Is the pump fairly quiet or does it make a lot of churning sounds?
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johnmn

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Re: Heatmaster wf4000 with pump issues
« Reply #5 on: March 09, 2019, 07:11:30 AM »

It's on the bottom supply port, it makes some churning sounds yes.
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RSI

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Re: Heatmaster wf4000 with pump issues
« Reply #6 on: March 09, 2019, 07:26:20 AM »

If you slowly close the return valve, does it quiet down before the valve is half closed? If so, you might need a smaller pump. If you get a new pump, I would go with a Grundfos 26-99 3 speed.
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johnmn

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Re: Heatmaster wf4000 with pump issues
« Reply #7 on: March 09, 2019, 07:39:31 AM »

Didn't really seem to change, but yes I agree this pump seems huge compared to the boiler at my last house.
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johnmn

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Re: Heatmaster wf4000 with pump issues
« Reply #8 on: March 09, 2019, 07:49:13 AM »

No idea if these issues go hand in hand or now but I also have burned a butt load of wood this winter. I have the 5 wrap underground lines. And house has new windows and doors and is well insulated. 3 times the wood of my old house with a 50% increase in sq. Ft.
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RSI

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Re: Heatmaster wf4000 with pump issues
« Reply #9 on: March 09, 2019, 08:12:09 AM »

If it didn't get a lot quieter then that probably isn't the problem. If is was cavitating, closing the return valve partially should have stopped it.
I would just try a different brand of pump.
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johnmn

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Re: Heatmaster wf4000 with pump issues
« Reply #10 on: March 09, 2019, 08:14:02 AM »

Here is what the local hardware store has for pumps
15-58 and a 26-64
B51R and a 106-89
Not familiar with the last two
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RSI

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Re: Heatmaster wf4000 with pump issues
« Reply #11 on: March 09, 2019, 07:12:03 PM »

The 26-64 is probably a pretty good size.
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wreckit87

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Re: Heatmaster wf4000 with pump issues
« Reply #12 on: March 09, 2019, 07:58:54 PM »

Where are you located? Seeing as there is MN in your name and you've got a crappy dealer from a 4000 I'm guessing it's the guy in Onamia? How big is the house and have you measured the round trip temp drop of the underground lines with no heat call? I suspect groundwater infiltration may be part of the high wood consumption issue seeing as you've got 5 wrap. Also, the domestic water exchanger should be before the forced air exchanger as DHW should be priority but that won't have any bearing on the pump issue. The 011 is a pretty big pump for only 50ft of 1" but that shouldn't be causing issues either if it's not cavitating which it shouldn't be with only that much head. I'd be interested to see a picture of how the pump is mounted. If you're not too far away I could check it out too, I carry Grundfos 15-58 and 26-99 on the truck at a better price you can get them from the store
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mlappin

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Re: Heatmaster wf4000 with pump issues
« Reply #13 on: March 10, 2019, 10:07:31 AM »

I agree with wreckitralph, I’d be getting a set of gauges at the back of the boiler and measuring your round trip loss with no call for heat in the house.
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hondaracer2oo4

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Re: Heatmaster wf4000 with pump issues
« Reply #14 on: March 10, 2019, 03:52:01 PM »

And food for thought, the tacos don’t hold up well to open systems. Grufundos or bell gosset have a much better track record.
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