monoflo tees

D107

(HO here) It's a one-inch monoflo with half-inch branches to the rads. When they replaced a few standard convectors with fan convectors meant to double as AC in summer, the flow to a few of them had to be increased. So what my late Dad (HVAC engineer) did was run a return to the boiler directly from the third rad in the line, allowing the rest of the supply to go on its way. That was for the powered kitchen rad which had it's own temp control --maybe something like a primitive TRV.

He also did it in reverse with the last rad in the system, splitting the zone, making that rad the first and only in that split zone, with its return branch joining the returning 1" monoflo back to the boiler.

The system seems to heat pretty evenly but I'd guess that wallies would ask that balancing valves be used.

good luck,

David

EJ hoffman

monoflo tees

Working on a single pipe system and need to get more flow up to a heat emitter. Can I put a ball valve or a flow restrictor of some kind between the two monoflo tees. System has 1 1/4" main galv Built in the forties-fifties.

Uni R_2

\"Monoflo\" both ends of the branch

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EJ Hoffman_2

did that still not enough

actually already had that the tees are really close though from original install plus they aren't on either side of the below radiator dont want to pull this thing apart two many times is there a problem or better fitting than putting a ball valve between the two tees plus moving them

Couderay

I would be interested in the shape of the pipe, inside that is, and are the branches out of the tee (bull) galvinized too.

Unknown

EJ,,,

Has this always been a problem, or just start? Did you change a rad, to put-in a longer one? What I`m getting-at is, maybe you don`t have enough flow along the main! What kind of circ is it?

Perry_2

Be carefull not to upset

the rest of the system. The system is designed that only part of the flow goes through a radiator - with the rest going down the pipe to the other radiators. Restricting main flow may cause problems downstream.

Do the radiators have individual throttle valves. Some systems have this (mine does).

I would suspect a problem with the individual run or radiator.

Note that I am a homeowner.

Perry

EJ hoffman

The HO for 13 yrs told me

This has always been a problem. Last year I changed some of the rads also system was condensing single pump with return water temps of 120 and talked HO into P/S with injection and constant circ. Stop the ticking and boiler doesn't condense anymore. One of the rads has never worked well there is only a six inch seperation between its tees i know I have to seperate them and put a downward tee between them but I dont want to tear it apart again.

EJ hoffman

pristine no corrosion at all

Unknown

EJ,,,

These rads are likely cast-iron BB or rads-on-feet if you had a condensing problem right? You did the right thing going to P/S with constant system circulation. Usually MF tees are spaced as far apart as the rad length, but not always. Can you give us some details of the system-side circ? Make, model? Even if the tees are closer together, and you have the flow along the main, the tees should divert.

EJ hoffman

old system was

black iron pipe with fins and various covers mostly baseboard but some homemade??? wood boxes. Currently secondary pump is a taco #10 But I found a math error in my inital work needs to be #11 switching that out on thurs. along with the main with that has the close tees