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Author Topic: Circulator UP26-99 vs. UPS26-99  (Read 7277 times)

Nick

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Circulator UP26-99 vs. UPS26-99
« on: November 29, 2012, 07:49:59 PM »
I recently had to replace the circulator pump on my non-pressurized wood doctor 8000. The pump the stove was installed with was a Grundfos UP26-99 which is no longer available. They crossed it to a Grundfos UPS26-99 3-speed pump. The problem I am having is it doesn’t seem to be producing enough heat to my forced air plenum. Last winter I had all kinds of heat and even cracked the windows all winter long. Now, I can’t seem to get enough heat blowing up thru the floor grates. I measured the temperature at the grate and it is only 26 Celcius therefore causing the blower to run continuosly to bring my home up to a warm temperature. I have tried draining some water from the supply line ahead of the circulator and also removed the coil in the plenum to see if it was plugged. I also tried all 3 speeds on the circulator with same results. The supply side of the coil is very hot to touch but the return is not. This new UPS26-99 circulator has a check valve in it where the original didnt.

 

It is getting pretty cold these days and any help or suggestions would bve appreciated.

 

Thank you,
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RSI

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Re: Circulator UP26-99 vs. UPS26-99
« Reply #1 on: November 29, 2012, 08:36:12 PM »
Pull out the check valve and see if that helps. It may be causing some air to get trapped before the pump.
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NewToIt

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Re: Circulator UP26-99 vs. UPS26-99
« Reply #2 on: November 30, 2012, 09:50:48 AM »
I was told to take out the check valve on mine before installation.  I can't remember the reasoning behind that because it's been some time ago, but it has worked fine since day one.
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farmermike

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Re: Circulator UP26-99 vs. UPS26-99
« Reply #3 on: December 01, 2012, 07:31:31 AM »
I have the UPS in mine,actually the third one(bad luck with pumps,but that's another story).I don't think I have a check valve in mine and it would serve no purpose to have one.Could your check valve be in backwards?Without seeing your hook-up,I can't see that an airlock could be a problem.
Good luck.
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JMA

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Re: Circulator UP26-99 vs. UPS26-99
« Reply #4 on: December 13, 2012, 07:57:45 AM »
Almost all non-heat problems are from air trapped somewhere in the system.
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coonsrich@yahoo.com

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Re: Circulator UP26-99 vs. UPS26-99
« Reply #5 on: December 21, 2012, 04:25:30 AM »
Sounds like an air block to me.  Can you cut into the loop at the lowest point and put in a tee to add water?  As suggested I would remove the check valve.  Was the new pump installed so the water circulates in the proper direction?  Hope it is fixed by now.
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