Munchkin's top-secret Vision reset curve---like Ultra?

R. Kalia

RPG did everyone a great favor by posting the WM Ultra reset curve in another post here. Presumably he/she was doing the research prior to buying (or in this case, not buying).

Now I had pretty much decided to get a Munchkin w/ Vision I this fall. But reading about the WM Ultra, it occured to me that the Munchkin's Vision documentation isn't posted anywhere.,although all other Munchkin documentation is available. Whatever the officially claimed reason for this, the result is that consumers don't have a way to check that the system is intelligently designed. (All Tekmar documentation is downloadable, so I know what features a good reset controller might be expected to have.)

So could a Munchkin-trained contractor please assure me that the Munchkin reset capabilities are not badly designed like WM's? What capabilities are contained in Vision I, what parameters can be varied, and over what range of values? (By parameters I mean such things as design outdoor temperature, design water temperature, type of radiation...) Can the Vision I read an indoor sensor to boost the water temp if necessary, the way some Tekmars can?

If I were to get a Munchkin, would the contractor have instructions from HTP to take the top-secret Vision I docs away with him, leaving me with no way to figure out how to adjust the reset curve? (If not, why can't I download the same docs now?)

jerry scharf

Vision 1 reset programming

HTP has decided that it wants everyone who designs or installs a Vision 1 system to sit through their intro. It's their call on that, and I don't feel free to post a bunch of information here. What I can do is give the details on how the Vision 1 outdoor resets are controlled.

There are 4 parameters that define the two points of the outdoor reset interpolation line.

minimum design temperature;
water temp at minimum design temperature;
maximum design temperature;
water temp at maximim design tempurature

The ranges that these can be set to are: -49to32F, 77to203F, 32to95F and 32to185F

The Fairbanks folks will have to live with 10 degrees of their design temperature that exceed the reset limits. Other than that it seems like overkill all the way around (but as long as the sensers have the range, putting wide ranges in doesn't cost anything.)

If they ever allow nonlinear interpolation curves (is you head hurting yet) then you could have some real fun!

thanks,
jerry

R. Kalia

thanks for the info!

> The ranges that these can be set

> to are: -49to32F, 77to203F, 32to95F and

> 32to185F


Many thanks, this is what I was looking for and it seems quite adequate! It's in fact useful to have flexibility in the lower left point (according to the above, it does not have to be 70@70).

> If they ever allow

> nonlinear interpolation curves (is you head

> hurting yet) then you could have some real

> fun!


When I asked if they allowed you to set the type of radiation, I was referring to the way Tekmars let you choose between a few pre-programmed nonlinear curves. Too bad it's not possible with Munchkin, but at least it's not a total disaster like the WM Ultra.

So, does HTP allow the purchaser to get any documention at the end of the install, without having to sit through their training session? I would like to adjust the parameters you listed based on operating experience (I would read circulator run time off my thermostat and thus adjust the curve to where the circulator is running almost all the
time).

Floyd_5

Chuckles...

Wait a couple of months and hook a Tekmar 263 to an Ultra
and you got exactly what you are looking for.....
heating is over for this year, take some more time, by fall there is going to be tons of new and exciting stuff out there.

Haste makes waste.....

Floyd

R. Kalia

> Wait a couple of months and hook a Tekmar 263 to

> an Ultra and you got exactly what you are

> looking for..... heating is over for this year,

> take some more time, by fall there is going to be

> tons of new and exciting stuff out

> there.

>

> Haste makes waste.....

>

> Floyd

munchkin-man

Ok Chuck there ya go do not post it

We do not want just any one messing with the program because ther are perameters that can be set at a maximum by the contractor for homeowner safety. Enjoy

R. Kalia

sorry...

I assume you were sending me the Vision I docs...if so, I no longer post showing a real e-mail address so your e-mail probably bounced. However, you may have the address in your mailbox from previous correspondence. Many thanks in advance!