Outdoor Wood Furnace Info
Outdoor Furnaces - Manufacturers with NON EPA-Certified Models Only => Wood Doctor => Topic started by: Nick on November 29, 2012, 07:49:59 PM
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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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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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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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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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Almost all non-heat problems are from air trapped somewhere in the system.
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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.