Tekmar selection help

Al Letellier_9

Sure you can use a relay and any break on rise sensor to do the job, if you're not worried about reset. It's easier and less expensive to do that way.

Norm Harvey

Objective: Constant circulation for one panel radiator on 4 season with warm weather shutdown that is simple and inexpensive.

Is it possible to use a taco 501 pony relay and use some kind of break on rise outdoor sensor for the TT terminals, or do I need to get into a Tekmar?

If so what model of Tekmar do I need? I generally use the logmatic or Viessmann controlls and haven't had to buy a Tekmar in quite some time.

Any help is appreciated.

Thanks,
- Norm

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Paul Rohrs_8

Questions...

Do you already have an outdoor-reset temperature available? Condensing boiler or atmospheric that you might need minimum return temps to prevent sustained flue gas condensation?

If you have the above reset temp, are you interested in DHW production down the road?

Since indoor feedback would be a good idea with constant
circulation, I think a 362 would be a good choice.

It will give you injection mixing for a full reset temp to the rads, minimum inlet temp for boiler protection, and an input for an indoor sensor.

Feed 24V(ac) to the mix demand for constant circ, and the WWSD warm weather shut down will be the governing factor for engaging and disengaging the reset temp.

Tekmar has several application drawings available online.

Regards,

PR

Norm Harvey

The heating system in question is a tankless oil boiler with an L8124A.

Due to the tankless the outdoor reset is not not an option.

The customer does not want to see a thermostat in the room, so I plan on using a TRV as the controller. A kind of "set it and forget it"

This is an addition to the existing house and a new modern heating system is nowhere in the plans. I do not want to over control, or over complicate things here. I want to deliver exactly what the customer wants which is heat to a space that fits her asthetics on an appropriate budget.

With a TRV only opening depending on the needs of the room, and constant circulation to make sure there is is hot water available when the TRV opens I am achieving her goal of the no thermostat asthetics.

I dont want to draw the electic power all summer long when there is no need, so I need something to shut the circulator off when its above 66-70 degrees.



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rjm

remote sensor--

what about a visionpro tstat located in the basement with a remote sensor- they are only about 1"x2".
or if you did do the constant circulator tekmar with a 4 way mixing valve.