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Old 10-29-2011, 01:20 PM   #16
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problems with Grundfos UPS 15-42F pump and my boiler heating system


Dont pull that out! I didn't see it had a bulb going into the one next to the pump. That is a well for the bulb of a remote mounted limit. Sounds like it is full of water. If the water is not circulating and the pump runs it may have a valve shut off somewhere or the pump impeller may be bad.

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Old 10-29-2011, 06:47 PM   #17
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problems with Grundfos UPS 15-42F pump and my boiler heating system


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Originally Posted by hvactech126 View Post
Dont pull that out! I didn't see it had a bulb going into the one next to the pump. That is a well for the bulb of a remote mounted limit. Sounds like it is full of water. If the water is not circulating and the pump runs it may have a valve shut off somewhere or the pump impeller may be bad.
the pump runs, and if I manually open the zone valve, I can feel hot/warm water gets in the pipe, but even if I wait for a good 10 minutes, the return pipe is still cold, so **I think**, the hot/warm water did not get pumped far into the pipe. So maybe it is the pump that is weak?

If there are lots of air in my in-floor tubes/pipes, will that prevent hot water gets pumped into the pipes?

Thanks!
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Old 10-29-2011, 07:14 PM   #18
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problems with Grundfos UPS 15-42F pump and my boiler heating system


If air is in the pipes, water won't flow. Need to get the air out.
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Old 10-29-2011, 10:54 PM   #19
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problems with Grundfos UPS 15-42F pump and my boiler heating system


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If air is in the pipes, water won't flow. Need to get the air out.
Thanks beenthere!

Could you recommend a couple of ways to get the air out? My system does not have a "manifold", and there is no purge valve, so what are my options if there is indeed air in the pipes?

Can I disconnected the supply and return pipes, and put a garden hose on the supply pipe, and use the higher city water pressure to push the air out?

Or, when I disconnect the pipes, all the water in in-floor pipes will drain out, leaving all the pipes with nothing but air, then I can use the garden hose + city water to fill the pipes with water, while have the return pipes disconnected? or maybe just use the circulation pump to do that?

Sorry for asking so many "stupid" questions.

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Old 10-30-2011, 06:02 AM   #20
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problems with Grundfos UPS 15-42F pump and my boiler heating system


Cant disconnect the pipes to purge the air out. There has to be a way to get the air out, cause they had to do so when the system was fist installed. Look for a connector for a garden hose on one of the pipes.
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Old 10-31-2011, 01:07 PM   #21
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problems with Grundfos UPS 15-42F pump and my boiler heating system


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Cant disconnect the pipes to purge the air out. There has to be a way to get the air out, cause they had to do so when the system was fist installed. Look for a connector for a garden hose on one of the pipes.
I see.
There is only one drain valve connected to the return pipe (cooler) side of the boiler, please see the schematic: (it is the left drain, just under the Pump. the "drain" on the right is actually a pressure relief valve)

http://s1113.photobucket.com/albums/...=schematic.jpg

if I open the drain valve, do you think the water pressure in the system will be high enough to push out the air bubbles in the pipes?

Thanks!
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Old 10-31-2011, 04:44 PM   #22
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problems with Grundfos UPS 15-42F pump and my boiler heating system


Thee would have to be a shut off valve between the drain and the boiler.

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