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memovox2 01-30-2008 09:42 AM

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.

Bondo 01-30-2008 10:38 AM


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....

memovox2 01-30-2008 11:21 AM

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

NateHanson 01-30-2008 11:26 AM

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.

memovox2 01-30-2008 11:44 AM

Do you have a pic of what that valve looks like?
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.

bigMikeB 01-30-2008 04:38 PM

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?

memovox2 01-30-2008 04:44 PM

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? ? ?

memovox2 01-30-2008 04:45 PM

Also, its been running for almost 24 hours since the install. . . just dont know if theres enough water replaced. I suspect Im close. . .

bigMikeB 01-30-2008 04:47 PM

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.

memovox2 01-30-2008 04:49 PM

can I email you pics? Or can you advise where to post them?

bigMikeB 01-30-2008 04:55 PM

I would say most people post to photo bucket or a site like that and post the link here.

memovox2 01-30-2008 05:00 PM

Uploading to photo bucket . . .
Posting in progress - - will have links in a few minutes. . .

memovox2 01-30-2008 05:09 PM

System pics:

bigMikeB 01-30-2008 05:21 PM

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.

memovox2 01-30-2008 05:23 PM

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

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