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Old 04-28-2013, 06:34 PM   #1
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Bleeding the system


I need to remove a small section of hot water baseboard from my parent's house. It's all piped with 3/4" copper.

We turned the boiler off and drained the water with the boiler valve on that zone. Some water came out, but certainly not all of it. I assume this is because we need some sort of a bleeder valve open, right? I looked at all the baseboards, and none seem to have bleeder valves.

Any idea how to get the water out of the system (aside from just cutting the pipe?) Thanks!

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Old 04-28-2013, 08:09 PM   #2
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Bleeding the system


For water to come out you need a way for air to get in. If you can't find a bleeder on that loop/zone you can cut the pipe to let air in or you're next option is at the boiler itself. Just remember that to resolder you will need all water gone near the joint being soldered

It sounds by your description that the system was installed with purge valves on each zone which is a major plus when refilling the system. This would also be the reason for their being no bleeders installed.

It's hard to explain how to do this on your system without being there to see it. Each system is more or less unique because of: Who did the layout and install. What type of zoning was used. How many isolation valves were installed and where. The list goes on.


Last edited by old_squid; 04-28-2013 at 08:13 PM.
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Old 04-28-2013, 08:39 PM   #3
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Bleeding the system


Yes, there are purge valves on each zone. 2 zones total, one pump, zone valves.

How does a purge valve on a zone eliminate the need for a bleeder valve?
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Old 04-30-2013, 05:06 PM   #4
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Bleeding the system


Small bleed ports were put on baseboard loops in the past to vent air out when filling the system or after air had gotten into the system somehow.

The purge valve/drain is the "best" of options of good/better/best ways to install a hydronic system.

By using a "purge pump", fluid that is air free is forced through the zone/loop at enough volume and speed to push all air out in front of it. Think of it like a garden hose that you connect up and then open the faucet full flow. You might get air initially and then a "burp" here and there for a few seconds, but eventually all the air that was in the hose has been expelled.
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Old 04-30-2013, 07:58 PM   #5
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Bleeding the system


But how does that help if i have to drain the system, not just remove the air?
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