bleeding radiators in a hot water system

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  #1  
Old 04-17-13, 08:32 PM
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bleeding radiators in a hot water system

hello

i have a simple one zone hot water heating system (oil furnace) with the old school heavy radiators. the hot water feed exits the furnace as one pipe and and than splits into 2 legs, one leg supplies the radiators on the north side of the house the other the south side, 8 radiators total. i have the old "bleeding keys"

what is proper procedure for doing this?
should the water be circulating or not?
which one in the system should be done first?
is this something that needs to be done annually?

thank you for the help
 
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Old 04-18-13, 04:22 AM
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Do you know if the water rads are connected in series (the exit of one rad goes to the input of the next)?
As for circulating or not, it's somewhat different setup to setup. In my home, circulating water is a must. I'm on slantfin baseboards.
Where to start, I'll generally start with the first rad/baseboard in the loop and work my way through to where it returns to the boiler and normally do this anually when I first turn on the heat for the winter. It may need to be done more then once. I had to bleed mine twice this year, about a week appart. The first time got most of the air in the system, but not all. A week worth of usage moved the air through the system and up into the highest points of the system.
 
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Old 04-18-13, 10:29 PM
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yes, connected in series

being that the water supply from the boiler splits into to legs will each leg be treated separately concerning the start point (start with the first rad/baseboard in the loop?)

still not sure if i should be "circulating" while bleeding ?

also, what/where are the "highest points of the system" ?
thanks
 
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