I recently converted from oil to gas, hot water monoflo system. I have
convectors throughout the house and 3 baseboard heaters (recently
purchase the home). After we fire the system up all the convectors
heated up, however the 3 baseboards didnt and there is no where to bleed
them. Do I have to add bleeders to the 3 baseboards? I also raised the
boiler temperature from 175 to 182 and noticed two of the 3 baseboards
heated up. Is there anything I can do or my best course of action in to
install bleeders on the baseboards? Boiler pressure is at 15 PSI, this
is a split level ranch and the 3 baseboards are on the 3rd floor.
It's "nice" to have vents in the high spots in a hot water system.
BUT if you have a air trap in the system at the exit of the boiler you can
eventually get the air out. But you have to have one or the other.
(The physics/chemistry is that air will dissolve in cooler water and go out
of solution when it gets hot. An air trap in a hot part of the system will
"pump" air out of the cooler parts.)
Thanks for your input, I have noticed that 2 of the 3 baseboards are now running
ok (hot) but the third unit in the bathroom is still cold. All the remaining
convectors are nice and hot and the system is running great. I have the
original installer returing on Monday to install bleeders on all 3 baseboards.
Would cooler water idea work by me turning down the boiler temp to the lowest
and running the system. By doing so would the circulator cause more air bubbles?
I am all new to heating system, however I am an Electro-Mechanical Engineer, so
I am not intimidated to fix the problem if I can. It looks like air is trapped
in the one baseboard which is on the 3rd floor and above the supply line.
John Gilmer wrote:
Might. If you have a way of taking air out of the system.
Some of it will happen just by running the system. In the loops where there
is a air block, the reduced flow will cause the supply to cool and thus air
will diffuse back to the hotter parts of the system. The air will tend to
stay in solution in the working radiators because they are also cooling the
That's why an air trap is so effective (and so necessary.)
If you have an air trap you can force a flow thru the air blocked part of
the system by shutting off the supply to to other parts. But you STILL
have to get the air out.
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