Wood fired boiler hook-up

World Plumber

Yes, I have seen them this way and installed them that way. You need to remove all your auto vents and install coin vents. You need isolation valves between wood boiler and oil boiler. After connection are made and system filled. Close isolation valves. Pressurize house system and bleed air from system. Make sure all bleeder valves are closed and there are no auto vents. Turn off your water supply and open isolation valves. As long as you don't have any air leaks the water will stay in the system. One note of warning if someone opens a bleeder vent higher tham the wood burner air will enter the system and the water will fall down. I hope this helps. Some of the manuals give details for this method of instulation.

nick z.

Wood fired boiler hook-up

Salesman told the home owner he didn't need a heat exchanger.Told the h.o. to do the following.
Shut off water feed
Turn valve off to expansion tank
Take all pressure of the oil fired boiler
This way you can just pipe wood boiler into oil boiler with out heat exchanger. The h.o. found somone to hook it up. But they couldn't get the air out of the system.(go figure). Has anyone ever heard of doing it this way?
I told pointed out to h.o. that the outside wood boiler is 20ft.lower than the second floor. We will have to cap any air bleeders to keep the water from running out, add low water cut off to oil boiler,and change exp.tank to old style and even then it might not work.

Unknown

It can work

that way, but the system must be absolutely tight for the vacuum to hold.
Be sure the circ is at the lowest point possible and it has enough head.

Dave

mtfallsmikey

What kind?

Of boiler that is...Central Boiler details this particular type of install. An example: my hydrocoil/air handler in the workshop is slightly higher than the water line of the OWB...only about 10". Put a BB tee/key vent for bleeding...the vent leaked..and it was BRAND NEW! (offshore junk!) Needless to say, the air leak caused the secondary circ. to starve/cavitate. What happened to the good 'ole Keeney air vents?

World Plumber

circulator

Mount your circulator down in the ODB water level pushing the water that way the circulator always has water. With you being with in 10 inches of the top of the boiler Pshing the water you should not have any problems.
I did some work in a big church where they were pushing the 4th floor wasn't getting as warm as it used to I had to add some thing like 96 gallons of water to bring it up to full.

Unknown

World Plumber

Is that not what I said?
The circ should be lower than the OWB water level, most require a positive pressure at the inlet, just be sure it can make the rounds.
The vacuum principal is only good to 30-31 ft.(above water-line) something like that.

Dave

mtfallsmikey

Oh,

Both my circs are below the w. line.