How are Taco 400 Hyvent bleeders used?

[ron45]

I have one on top of each string of four hot water collectors for a total of three Hyvents. I know what they do and a little of how they work. But what I don't know is should I leave the little screw in the top slightly open or close it tight. They are currently running with about a quarter turn open. But in attempting to find more info I ran across statements that led me to question the idea. Seems to me if they are to evacuate air a case could be made for closing them after a day or three of trouble free operation. I've seen steam venting from the oldest one when it's string was stagnating. This was on the first day of charging the newly operational system so there was probably still air in the system. I have covers that roll down in summer to keep the sun off and dropping those brings things back to normal in about fifteen minutes. I haven't seen any liquid come out of the two new ones yet. The pump is a Taco OO11F. And may be undersized a bit. Tho the system is on it's fourth day of trouble free operation. I't 79 in the bedroom now. It's also in the low fifties outside. This is not the norm for around here at this timeof the year. But no harm in heating up the core a bit. Better to open windows than have to build a fire.

Ron

[russ]

To function the vents must be able to vent to the atmosphere. In the event they are closed they become part of the pipe and do nothing.

[ron45]

To function the vents must be able to vent to the atmosphere. In the event they are closed they become part of the pipe and do nothing.

That's how I'd been using them before, but our floor system was down for 9 years and I couldn't remember if it was open or closed. Thank you.

Ron

[Naptown]

If these are automatic bleeders to vent air from the system close them now. They have a tendency to leak and you will lose pressure on the closed loop side of things. Assuming that is that this is a closed loop system.

[russ]

If these are automatic bleeders to vent air from the system close them now. They have a tendency to leak and you will lose pressure on the closed loop side of things. Assuming that is that this is a closed loop system.

Then you lose the vent capability? Many are not that interested in clambering over the roof to check the vent manually.

Mine work fine.

[Naptown]

Then you lose the vent capability? Many are not that interested in clambering over the roof to check the vent manually.

Mine work fine.

We used them on the Reynolds systems. These were closed loop glycol systems. they always ended up leaking. Our standard was to leave them open for a week at which time all the air was purged out then close the cap. Once the air is purged they are useless in that application.

[ron45]

Taco air bleeders

Do these have to be in the middle of a pipe run in order to work properly? It looks as tho the little paddle that hangs down is meant to be moved by the flow in the system. Mine are open to the system at the top of small risers, maybe 8 or 9 inches, that I installed to trap air if there is any. I added the tacos later. No leaking here and they are open about a turn and a half.

We aren't having any problems. So far everytime I check, which is often since we are still in the first two weeks after charging our renovated system there is no air, only glycol at my schrader valve at the high point in the house. Same if I begin to losen the 1.5 threaded caps on the array,

It's good to find a place where people are using this stuff. I keep worring about stagnation because it's unusually warm here at 7K feet for this time of year. At 3:05 p.m. t's 56 outside. They are hummimg along nicely, we are still in the process of insulating the send side of the interior feed lines. They will both be in a curb along the walls where they run. I didn't want to tear our floors up. The curb will be made of cob. Anyone here familiar with it?

Ron

[Naptown]

Do these have to be in the middle of a pipe run in order to work properly? It looks as tho the little paddle that hangs down is meant to be moved by the flow in the system. Mine are open to the system at the top of small risers, maybe 8 or 9 inches, that I installed to trap air if there is any. I added the tacos later. No leaking here and they are open about a turn and a half.

We aren't having any problems. So far everytime I check, which is often since we are still in the first two weeks after charging our renovated system there is no air, only glycol at my schrader valve at the high point in the house. Same if I begin to losen the 1.5 threaded caps on the array,

It's good to find a place where people are using this stuff. I keep worring about stagnation because it's unusually warm here at 7K feet for this time of year. At 3:05 p.m. t's 56 outside. They are hummimg along nicely, we are still in the process of insulating the send side of the interior feed lines. They will both be in a curb along the walls where they run. I didn't want to tear our floors up. The curb will be made of cob. Anyone here familiar with it?

Ron

The little flap that hangs down is a float. The theory is that when air builds up the float drops opening the vent until it floats up and closes again. the practice is that they eventually leak, the floats become saturated or the valve fails to seal. If you have no air after 2 weeks close the caps. Most new systems don't have them any more they were such a problem. New charging pumps and care not to pick up air when circulating new fluid have gotten better of late.
ke in a carberator

[ron45]

I can see the logic in your thinking. If I need to continually evacuate air there leaks somewhere. Thanks.

Ron