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 Hot Water Not Circulating
Author: mmsitarski (NJ)

I have a Weil-McClain Gold forced hot water boiler (oil). I have it set up as one zone. The burner fires and heats the water to 220 degrees (what the aquastat is set to) then the burner kicks off and the circulating pump stays on but the water does not circulate to the baseboards.

I would think that if the pump is working correctly then the cold water should be entering the boiler and keep the temperature inside the boiler cool enough until all the water is heated to 220 degrees. I opened the bolts around the pump and water came out, I was told that this would suggest that the system is not airlocked... is that correct? Could the system be airlocked or is it that the pump is malfunctioning?

Thanks,

Matt



Edited 1 times.

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 Re: Hot Water Not Circulating
Author: Shoemaker2 (MA)

The piping my have ice in it if the heat has been off in this cold weather we are having. Depending on how you system in piped you may be able to purge the system and force the water around the loop and out a hose connected at the purge set-up. That is if it is pipe properly.

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 Re: Hot Water Not Circulating
Author: Paul48 (CT)

Loosening the bolts proves nothing, except that there is water in the system.As said, it could be frozen pipes, air-bound, or a bad circulator pump. If it's down for any length of time, it may be a couple of those things.

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 Re: Hot Water Not Circulating
Author: SMSPlumbing (PA)

Just out of curiosity, why do you have the high limit set at 220. That is over the boiling temperature. You would be just fine with setting it at 180 high and 160 low.

And I am agreeing with what else has been said.

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 Re: Hot Water Not Circulating
Author: LemonPlumber (FL)

Please bring me several gallons .you are dropping onces.Hope the check is in order.

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 Re: Hot Water Not Circulating
Author: RWP (SD)

I agree with SMSPlumbing. 220 F is way too high for the high limit to be set. 200 F maximum or preferably lower. The boiler is more efficient at a lower setting but not so low it will not heat the house.

There are reasons that heating system anti-freeze was invented and this is one of them.

- - - - - - - - - -

Retired after 50 years of plumbing and heating.



Edited 2 times.

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 Re: Hot Water Not Circulating
Author: hj (AZ)

It is an indication of limited, or no, flow, usually caused by an "air pocket" in the system, or a blocked pipe. There is no "cold water entering the system" unless the pump is putting it there. The burner heats the water in the boiler, but if there is no circulation, then that is the ONLY water that gets heated. Your concept of how the system works is faulty.

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 Re: Hot Water Not Circulating
Author: hj (AZ)

It is not above the boiling point for a pressurized system, but may have been raised to compensate for an underdesigned system.

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 Re: Hot Water Not Circulating
Author: hj (AZ)

quote; There are reasons that heating system anti-freeze was invented and this is one of them.

It MAY be one of them, and then again it might NOT be. We DO NOT know why it is not circulating, but there are more air bound systems than frozen ones.

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 Re: Hot Water Not Circulating
Author: packy (MA)

i vote for a frozen pipe...
200 deg is about right for this time of year. 220 is too high.
once the low temps go to the 30's you can lower it to 160..

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 Re: Hot Water Not Circulating
Author: rudythplbr63 (AK)

My guess is that the pump volute is installed backwards, and the pump in it is working normally. I ran into that problem in a motel in Nevada. The owner said he'd had the pump changed out a year b-4 and it hadn't worked since.
So I went and took a look and sure enough the volute was backwards, and not pumping any return water to the boiler. It was trying to pump water out at the return. Nothing was happening b.c. it had a flow control at the top of the boiler.

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