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Old 01-30-2008, 10:42 AM   #1
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I added a radiator to my system and now need to know how to refill enough water


Great website - tremendous resource. You all should be proud of the support you offer!

Question: In a remodeling project in my vintage home I successfully added a radiator to my system in my new bathroom. Vintage cast iron with copper pipe. All went great with no leaks etc. . . Now I want to be sure I have repleneshed the system with the right amount of water accounting for the water that came out to add the new radiator and also to account for it in the system. I have a Weil-McLain Model CG.

One web posting somewhere said the system is meant to be full. Does that mean I can open the water shut off valve and let water flow until I hear it fill? Again, I look to the experts here for advice. - Chris.

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Old 01-30-2008, 11:38 AM   #2
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I added a radiator to my system and now need to know how to refill enough water


Ayuh,......

There should be a pressure reducing valve where your boiler get's it's water from the domestic supply,....
Usually they're preset for the required 12psi,.....
Find that Valve,+ you may find it's already refilled the system.....

If you don't find it,...
Post some pictures of the plumbing around your boiler....

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Old 01-30-2008, 12:21 PM   #3
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I added a radiator to my system and now need to know how to refill enough water


So it automatically replenisheds itself? I dont think I have that.

I see a blade handle valve that I can trace back to the water suppply. . .

My system has been running for hours and the pressure reads like you said about 12 -13 psi. . .
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Old 01-30-2008, 12:26 PM   #4
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I added a radiator to my system and now need to know how to refill enough water


If your system pressure reads 12 PSI, then you almost certainly have a pressure-reducing supply valve somewhere. Otherwise your system would read supply pressure, or zero, or something else. Unlikely it would coincidentally read 12 psi by chance.

You probably just need to bleed the air out of the system. Find all bleed valves (including on your new radiator), and open them a crack to let out air until you get a solid stream of water. Repeat that after running the circulator pump(s) for a while, as air will continue to collect at those high spots.
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Old 01-30-2008, 12:44 PM   #5
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I added a radiator to my system and now need to know how to refill enough water


Thanks for the reply. . . Do you have a pic of what that valve looks like?

I donts see any auto fill type deal anywhere. I would think I would hear the water fill up when it works then too right?

I thought that auto fill valves werent good as if you developed a leak or pipe break etc you could have gallon after gallon of water flowing or something. . .

I will keep bleeding the radiator valves with the little key in the meantime until I hear back from you all.

Again, great website & many thanks to all. - Chris.
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Old 01-30-2008, 05:38 PM   #6
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I added a radiator to my system and now need to know how to refill enough water


Without a PRV you could run the system out of water and crack or blow the boiler up. You need to post a couple pics of the near boiler piping. Have you opened all the valves you closed to do the install work?
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Old 01-30-2008, 05:44 PM   #7
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I added a radiator to my system and now need to know how to refill enough water


I have a pressure relief valve it has a hose that leads to the drain. This is the safety if the sytem gets to full / pressured right? Where can I post photos to? ? ?
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Old 01-30-2008, 05:45 PM   #8
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I added a radiator to my system and now need to know how to refill enough water


Also, its been running for almost 24 hours since the install. . . just dont know if theres enough water replaced. I suspect Im close. . .
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Old 01-30-2008, 05:47 PM   #9
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I added a radiator to my system and now need to know how to refill enough water


Yes, a relief valve protects the system from over pressurization. But you have to have a pressure reducing valve in the piping some where, it would be impossible to run that boiler at city pressure.
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Old 01-30-2008, 05:49 PM   #10
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I added a radiator to my system and now need to know how to refill enough water


can I email you pics? Or can you advise where to post them?
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Old 01-30-2008, 05:55 PM   #11
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I added a radiator to my system and now need to know how to refill enough water


I would say most people post to photo bucket or a site like that and post the link here.
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Old 01-30-2008, 06:00 PM   #12
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I added a radiator to my system and now need to know how to refill enough water


Posting in progress - - will have links in a few minutes. . .
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Old 01-30-2008, 06:21 PM   #14
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I added a radiator to my system and now need to know how to refill enough water


The pressure reducing valve is the fitting on top of the extrol tank, it isn't a fast fill type. It's preset to 12 psi.
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Old 01-30-2008, 06:23 PM   #15
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I added a radiator to my system and now need to know how to refill enough water


so what does that mean? should I add more water?

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