How to shut off hydronic heating system?

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Old 01-20-14, 03:11 PM
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How to shut off hydronic heating system?

One of my hydronic radiators has a crack in the copper tubing. I have someone coming to help me fix it tomorrow, but I would like to shut off the water from the system completely. I have a container under the crack holding water, but I need to dump the water every 15 minutes. So I need to shut off the water flow.

Only thing is, I don't know how to shut it off. I've included pictures if anyone can tell me what valve to shut off. After tracing the piping I only found one plausible valve. I circled in the picture the valve I switched. Can anyone confirm that this is the right one? Or am I going to blow something up?

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Old 01-20-14, 03:54 PM
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1) Turn the power off to the boiler.

2) close cold water feed line ball valve --

See the small black pipe with the automatic vent valve at top of boiler,
follow that piping back to the first ball valve,
close that small ball valve.
 
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Old 01-20-14, 05:00 PM
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Do NOT run the boiler with the valve you have circled closed!

If you are not sure what Worm is saying, the automatic air vent is the round brass can with the cap on top near the right front of the boiler.

The valve behind that is a 'bell shaped' valve... it is your 'pressure reducing valve' and is where the city water feeds into the boiler system.

You need to follow that pipe around and shut the valve that connects that pipe to the domestic water pipes.

AND SHUT OFF THE POWER TO THE BOILER! YOU CAN NOT RUN THE BOILER WITH A LEAKING PIPE AND NO WATER GOING IN!
 
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Old 01-20-14, 05:10 PM
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After you get all that other stuff shut off, you will still have water trapped in the baseboards leaking out. I see you have two zones, figure out which one is leaking and open the ball valves back up so you can empty the water out of the boiler drain.
 
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Old 01-20-14, 05:14 PM
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Thanks guys, the boiler was already turned off. Sorry I did no mention this!
 
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Old 01-20-14, 05:27 PM
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Are you referring to this valve? I marked off with a red arrow.

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Old 01-20-14, 06:31 PM
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Yes. that is the feed water shut off valve.
 
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Old 01-20-14, 08:02 PM
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And while you've got the pressure off the system it would be a most excellent time to check and charge the air in the expansion tank.
 
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