monoflo tee usage

scott jacobson

the radiator is a myson select which came with TRV and LKD valves. The old baseboard ran to one end and out the other in the installation book it shows using a monoflo tee to feed radiator but I also want to add a 4 foot bb in a small room attached to room with large radiator. Do I need a monoflo tee on this also. There is a monoflo tee feeding off the main pipe going to these and a regular tee on return.

scott jacobson

monoflo tee usage

I took out 13feet of baseboard and replacing with a myson select radiator the old bb has a monflo tee off the main do i need to use a monoflo tee to supply my new radiator or just loop thru thanks s jacobson

Brad White_27

If I grasp what you are describing, Scott

you are re-using the same return-side mono-flow tee and standard tee on the supply. Is that correct?

Or when you say 'just loop through', do you mean place the Myson radiator in series with the main (run the main through it)?

I cannot find pressure drop data for the Myson but other units of that type (Runtal in my experience) have low pressure drops and do well with low flows anyway (radiant as much as convective). My thinking is that it should work fine and be not unlike the removed baseboard in pressure drop. If you have any doubts, you can place another monoflow tee on the supply side and a balancing valve on the return branch should it be too much. If it were me, I would just pipe it up as the baseboard was. I would take the risk.

Brad White_28

Scott, I would think that

if the Myson has a TRV, then the pressure drop would be more than any baseboard section you have. In that case I would use two MonoFlow tees for that radiator. If you are adding another piece of fin-tube, I can see that having just one tee. The assumption here is that none of the other baseboard sections have TRV's or other restrictors.

What you are up against when you have more MonoFlow tees in series in your main is, of course, the cumulative pressure drop not to mention dilution of your water temperature. Nothing new there and if BTU's are the same in any replacement then all things should remain equal, same as before.

If you have a fairly large main size (1.25 inch for example, if not larger) and a modest amount of runouts (maybe 5 to 8 radiator segments at less than 1 GPM each, I think you will do just fine.

If you are getting concerned about cumulative pressure drop and temperature drop, you might consider splitting the MonoFlow loop into two, with a single home-run return if that makes sense.