diverter tee system

John H

I installed a boiler,pump and moved around some rads in basement of a home. for some reason I can not get 1 rad to work.The only change made to this cast rad was it was replaced with a larger cast rad and moved 15ft.The old 3/4' drop lines were rerouted with 3/4' pex.I have bleed buckets to try and get it to work.I know once you have water it is not a air problem but I thought 1 line mite be trapping air.still no flow through this diverter tee system rad.All other rads work fine.I need help

masterplumb

one pipe

Is this radiator below the main? If it is the drops should be a direct drop to the radiator,the same distance apart as the radiator. Another option would be to incorporate the radiator into the return. Chris

[Deleted User]

4 choices

1. Find the old radiator & put it back where it was.
2. Install a separate pump for the new radiator.
3. Relocate the supply & return tees where they should be for the new radiator & make sure the main & pump will handle the added radiation.
4. Buy Dan's Book with the rules for 1 pipe systems.

I suggest #4. Good luck.

Joe_30

Ron, What smaller pump is there to pull more water to a distant radiator, or longer iron baseboard, added to an existing monoflow system.? How would you control it if it's on same zone as 3 other rooms? Manually? Or a separate T-stat to a relay? Interesting idea anyway.
In this case , it's a second floor addition. The main circ. is a Taco 007. Opinions?

Ken_8

I hope there's two

monoflow tees on that basement rad.

All monoflos below the trunk line need to be VERY small in output - or double monoflowed! The typical single monoflo and "normal" tee don't cut it in a basement rad below the trunk

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Uni R

Diverter Tees

The tees need to be widened appropriately for the larger rad or you should put the old rad back. There should be monoflos at both ends.


What's the diameter of the inside of those PEX fittings? I'll bet, it's a lot smaller than anything on that 3/4" black iron pipe that was there. That won't help convince the water to go that way.


Bleeding basement rads? What kind of basement rads are these?

Robert O'Connor_7

Monoflo ??

The other posts are correct. The only other thing I would do, short of installing additional pump would be to use TWO (2) monoflo tees, and install them so they oppose each other. ie: one tee diverts, while the other tee asperates. BOC

John H

response to your questions

This the the first time to this site and i am amazed with the knoledge here.Answers to some of your questions it is a 5ft long cast rad below the main.The old rad line drops were right at the monoflow tees to a 3ft rad and the tee's are aprox 3" to 8" apart.The biggest chalenge is that the basement is now finnished and i would hate to start to cut into the ceiling.I'm still thinking i mite have are traped in 1 of the pex lines,mainly because the pex mite have some waves to it.I accually have Dan's book and read that increasing system presure mite help get ride of the air possibly traped.One final note could a larger pump help?(ups15-58)installed now.

Thanks Guys

Uni R

Spacing

The air shouldn't be a factor unless you have loops. A larger pump is not a good solution unless you need it for flow (otherwise it is costing you electrical $). The problem is that when the water gets to the first diverter tee it follows the path of least resistance and that is for most of the flow to bypass everything and go straight to the other tee. Those tees should be 5' apart. You can take out the diverter tees and make them transitions to the pex (that rad would get all of the water flowing through it and may cause heating balance issues) or you can try and add resistance between the tees by installing a valve or reducing the diameter of the pipe in between there. Water is lazy... You're going to having to do something to encourage it.