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injection piping

shawn_5 Member Posts: 52
here is a picture of what I am piping on the injection pump area do you have to have the offset in the piping or can I put the pump on the horizontaland go right into my tee.also how would I purge this set up with the purge setup on the feed.


  • Hydronx_2
    Hydronx_2 Member Posts: 15

    Injection pump can be placed horizontally with no problem. The offset is recommended for a thermal trap to keep hotter boiler loop water from migrating to the radiant zones when the pumps aren't running. Tekmar recommends a 12" drop from the boiler loop to the mixed loop. The air is purged through the boiler drain and valve that are located in your mixed loop but they should be on the other side of the 2 injection tees from what your drawing shows. With check valves on the pumps you won't be able to purge the zones backward.
  • shawn_5
    shawn_5 Member Posts: 52

    thank you
  • Weezbo
    Weezbo Member Posts: 6,232
    why zone it with circs?

    zone valves and one recirc would likely be my choise....also a run out 0f about 20 pipe diameters keeps the pumps from trying to see which one is the baddest :) i still like the 5 foot seperation of recircs, that way they are far enough away from one another that a fight seldom ensues...:) with the lash up you have youd probably benifit with some of those yellow handeled purge and shut off valves , one on each zone...
  • Wayco Wayne_2
    Wayco Wayne_2 Member Posts: 2,479
    Hey Shawn

    Cool diagram. What do you use to draw? The circ can stand in any posistion as long as the motor portion is horizontal. This is for lubrication purposes. I use a Grundfos 3 speed Super Brute (UPS15-58) with a built in check valve so I have flow control when it is off. I run it on low speed depending on GPM needs. Be sure to put a "circuit setter on the injection return line so you can set your flow. If there is not enough resistance the injection control will have a hard time throttling down against a large range. Sorry to go on so long but why not make the baseboard loop a secondary loop off the primary boiler protection loop so the cooler return water from the baseboard can help step down the temp going to the injection take offs. You gotta love Primary Secondary piping. My personal preference is circs not zone valves. That way I'm assured flow through my heat emmitter loops, and since I use the 3 speed circs with check valves I don't have to worry about ghost flow and can adjust my flow with the flip of a lever. WW

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