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Old 09-28-2013, 11:01 PM   #1
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Discontinue Use/Draining one Heating Zone


Hey there. I have an oil-fired boiler with two heating zones. One serves the finished attic while the other serves the rest of the house. Currently I am not using the attic, so heating it seems to be a waste. The only reason I can think of to continue heating up there is to keep the PEX pipes that carry the hot water to the radiators from freezing. I figured if I can drain those pipes, I wouldn't have to worry about it. How do I go about this? Just close the shut off valve on the zone I want to drain, attach a hose to the drain fitting and open the drain? What about if I ever want to start heating up there again? Just open the valve and let the water flow into the pipes? I'm guessing that the air must be purged somehow. My radiators are only a couple years old and have no valve on them to release air. How do I get the air out? Took some photos of my system just in case. Thanks.




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Old 09-29-2013, 06:09 AM   #2
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Discontinue Use/Draining one Heating Zone


You'll need to find a way to let air in the supply side to drain the attic zone. Pics don't show enough.

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Old 09-30-2013, 03:48 AM   #3
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Discontinue Use/Draining one Heating Zone


Here's a few more photos. Not seeing any other drain valves on this end. I'm guessing I wouldn't be able to fully drain without it?





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Old 09-30-2013, 04:20 AM   #4
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Discontinue Use/Draining one Heating Zone


It can be done by letting the air vent draw air in while the loop is draining. You have to manually open the zone valve for the attic to let the air draw into that zone loop.
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