check out this new setpoint control!

hr

-40F - 240F or C scale of course

1-100F differential! wow

nice blue dual display includes setpoint and sensor readings

The display backlite can be always on, always off, or 30 second on after buttons are pressed.

Quick set without getting into complicated program

max and min memory of temperature readings

pulse with modulation mode(or not)

short cycle delay adjustment
red (relay energized) indicator light

lockout mode

power surge protection

SPDT relay or dual relay model

nice connections

plastic case

Almost pretty enough to be a wall stat

My search for the perfect SP control is over.

From the same folks that bring you that nifty dual temperature Digi-stat

www.azeltec.com

hot rod

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ALH_4

Sounds very nice

Now how about a differential temperature setpoint control? ;-)

Weezbo

That Certainly has some nice features. *~/:)

that short cycle delay and the , .1 F sensitivity,PWM,and the 100 degree differential..that must pretty much put it in a class of it's own. Hmmm....nice "find"

Thanks.

Rob Blair

Setpoint Controls

HR. Could you give me a brief synopsis on the usage of setpoint controls like the ones you described? Do they work a control? A Boiler? Mix? Are they a thermostat?

Rob

The Boiler Dr.

Who is carrying this device?



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Uni R_2

Online...

The office is here in the Toronto area and they're manufactured on the other side of the Pacific.

hr

Just a switch activated by temperature

in it's simplest form. It can and is used for many functions. It coulfd be a control on an indirect or buffer tank. Many wood boilers use these controls.

It could switch an electric heater on and off, be used as a slab sensor and operating control, etc.

It differs from the aquastats we are familiar with that use capillary tube sensing devices. With a cap tuybe the fluid in the sensor expands when heated and pushes a snap switch.

Setpoint controls use thermistors to do the temperature reading. Most can be extended up to 500 feet. They are more adjustable, and I feel more accurate than cap tube style controls.

By the use of electronics instead of pressure switch (cap styled) many more features can be added like time delay, digital readouts, pulse width modulation etc etc.

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Brian

Tekmar 150

Why not use a Tekmar 150?

Dobber

Uni R_3

Or a Johnson A419?

Ericjeeper

I am using an A419

I think it was around 60 bucks. How does the cost of this one compare?

zeke

puzzled?

With all due respect, I can't understand how this control works. Could somebody explain it to a dummy like me. Does it control indoor temperature or is it an aquastat? I am thoroughly confused.

zeke

Ken_40

Zeke,

Follow the link to their Canadian website. There, each product they market/make/import is explained in detail.

I fail to see Bob's reason for excitement. Tekmar, Honeywell, Heat Timer, Johnson and all the "others" who come to mind make the same stuff, and are stocked at many supply houses, not "mail order." Most of all, they are pricey when compared to the stuff we see that is already available her in the U.S.

Granted, this one control Hot Rod touts as "special" may incorporate a few parameters not available in any other manufacturer's catalog, but then, all of them make something "unique." The question becomes, "Do we really need that - or would it merely be 'nice to have'"?

Hot Rod seems to have all the "fun" with regard to cutting edge technology. Many of us think anticipatory logic on a 'stat or a steam vapor system is a cutting edge.

And so it goes in the land of the working class poor and unknown...

hr

I have used all

the above mentioned including Ranco, Penn, Heat Timer, Goldline etc, etc.

This Azel has so many more features to make it a "one stock" part on my truck. I've not seen another brand with dual display, min./max. memory, wide differential, and a big wiring compartment.

I'm always on the lookout for a better product for me and my customer.

It is an advantage to install temperature controls that the AVERAGE homeowner can read, understand, and adjust on their own. This one fits the bill nicely.

Tom took the time to poll contractors, then included all those features. It's nice when a manufacture reacts in that manner. And in a timly fashion.

Now about those small output mod cons

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Ken_40

Equating more - as better...

Is a leap I cannot accept.

Without seeing one of these babies, any comment or comparison on my part is moot. I see the assumption of what customers want vs. what we want - as more wishful thinking than the reality of my experiences. Nonetheless, there are times when more information is critical to the application.

But as my wife Jaye has asked me 20 times in the past year when looking at the 'stat, "Is the temperature on the right, or the left the 'true' room temp"?

So much for dual read-outs being "a good thing."

zeke

why so accurate?

Ken,

Thanks for the response.


I have another question. Why would you need control of temperature to the 0.1 of a degree, and they talk about undershoot and overshoot, possibly of 1 degree as a BIG problem? Are they oversophisticating this market with inordinately expensive tools we dont really need in the name of "efficiency", or are these people using this for improved marketing?


Where is the evidence that on the whole these controllers are cost effective or just "toys" that engineers who come from the aerospace industry and apply overkill techniques to the HVAC industry that were used to shoot down high speed targets in space?

They are talking integral and derivative and proportional control when on/off control can easily do the job sometimes with equal efficiency at little cost.

Weezbo

it is akin to tolerable vs comfortable ...

That and knowing without some control over the various components of the entire system the Fuel Oil Company MUST love You. *~/:)

zeke

I would be interested if 1 degree is "tolerable" vs .1 degree comfortable. Would your body know the difference?
Moreover, I am all for good control, not overcontrol. And oil companies not only make money on fuel but also on replacing expensive electronic controllers that are not as reliable as the old fashioned electromechanical ones.

zeke

OOps, I double posted, Sorry