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Injection mixing

Bernie Riddle_2
Bernie Riddle_2 Member Posts: 178
in THE MAIN WALL
Need opinions on the easiest/cheapest way to set up a constant circulation, injection mixing system in a slab radiant system? Also want outdoor reset....

Taco radiant mixing block? Tekmar controls?

This will be installed on a existing working "dumb" system that consists of a main boiler loop, and a zone for the floor that has a 007 circulator and a series 5000 mixing valve and is controlled by a SR 503 EXP switching relay.


I was going to try the 4 way valve reverse flow cirulation but after talking to a few people they think injection mixing/constant circulation is the way to go.

Thanks for the info/opinions in advance!

EDIT>> I see I can add a PC705-2 mixing control to my 503 EXP switching realy to do what I want to do? Correct?

Comments

  • Unknown
    Unknown


    I do not recommend injection mixing for constant circulation. It can be very, very difficult to prevent ghost flow. It can be done, but if your injection circuit is not perfect, you will get calls for overheating spaces.

    True constant circulation requires indoor feedback moreso than outdoor reset, though most CC controllers use both. We like 3-way motorized valves (when it's closed, it's closed. period!) on Tekmar 360/361 using an indoor sensor, or a 362/363 using an 062 RTU which is a bit more user friendly.. the 360/361 requires using the controller to change room temp.

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