I have a small problem I need help with. I have forced hot water with baseboard
heat. My expansion
tank sprung a leak last week. I replaced it by spinning the old one off and
spinning the new one
on. In the process I lost some water. My problem is that now when the heat
comes on I hear water
running through the baseboards. I know there's a way to bleed the zones but I
have forgoten how. I
also remember it has something to do with the faucet and shut off valves at the
end of each zones
run back to the furnace. One last thing, on the top of the manifold that the
attaches to, there's a small round part with what looks like a tire valve stem
on the top of it. It
has a cap on the stem and when I loosen the cap, water starts dripping out. Is
this some kind of
bleeder ??? Do I leave the cap loose and let it drip ????
The easy way, is to turn the electric off, relieve the system pressure,
replace that "small round part with what looks like a tire valve stem on the
top of it" (automatic air vent), add water to the system, turn the electric
on, and wait a few days. The cap is just there to close it off if it starts
leaking. It should normally be loose. Most times, the air will eventually
work it's way around and come out that vent.
The harder, but quicker and more positive way of getting the air out, is to
first turn off the electric, then close all (return line) shut off valves
that are between the "faucet" (boiler drain valve) and the heater. Then put
a hose on one of the drains, purge the air out by opening the drain valve,
repeat the process on each zone, and then open the shut off valves. With
this method, you need to maintain constant system pressure.
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