My furnace is a forced hot air system.  Oil heats the water, hot water
circulates to 2 blower systems.  One set of pipes seems to have air in
them.  I've got a 4 zone system, one blower handles one zone, the
other handles three zones.  When the system starts circulating water
for the 3 zone system, its very noisey.  How do I get the air out of
that system?  I see an exit valve that I can hook a hose up to, but
I'm unsure uf which valves to close, if any.

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Clarification of Question by douglaswm-ga on 05 Mar 2004 19:39 PST

i can provide a drawing on the furnace system, if needed.

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Request for Question Clarification by redhoss-ga on 06 Mar 2004 06:57 PST

Does your water system and valve location look anything like this:

http://www.warmair.com/html/hydronic_heating_systems.htm

I don't know anything about your type of heater, but I'll bet that we
can figure out how to get the air out if we can locate all the valves.

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Clarification of Question by douglaswm-ga on 07 Mar 2004 18:31 PST

Very similar, except there are 3 branches off the drain valve line,
each with what I think is a (red) pump attached.

Okay, 

The exit valve, where is it located? 

Can you draw a picture of the piping? Or even take a snapshot of the
setup, the valves your looking at.