Interior controls have their own issues in apartment buildings. You're at the mercy of the tenant in one specific apartment with their set of conditions. Yes, you can use two of them, thereby mitigating the issue somewhat.

Well, the question that still remains is whether it is wind driven or not. I still believe it has to be the primary driver down at very low temps.

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Well, the question that still remains is whether it is wind driven or not. I still believe it has to be the primary driver down at very low temps.

Why can't you simply raise the curve on one end? Why does the curve require a "knee"?I'm just not accepting that as necessary.

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The problem with ACH is that it only accurate at one specific wind speed.Whatever curve you setup with a specific ACH is only valid at a single point.Those with "reasonable" ACH might not notice the difference. Those with large ACH certainly will.

The problem with ACH is that it only accurate at one specific wind speed.Whatever curve you setup with a specific ACH is only valid at a single point.Those with "reasonable" ACH might not notice the difference. Those with large ACH certainly will.

I discussed this with Mark and understand that he added it to Eco-Steam because some of the buildings did fall behind when close to design.

You make the conclusion that you have a non-linear condition, but, in reality, the wind, in conjunction with the infiltration loss (which might be underestimated) is the culprit.

You use the same percentage for wind chill compensation...........strictly dependent on velocity.............independent of outdoor temp?

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Tekmar 279Manual

We're experimenting with our Tekmar 279 steam control on our Weil Mclain EG-75 boiler since we thought we'd save about 20% compared to the older boiler we replaced... we thought we'd see another 10-30% reduction in fuel use for up to 50% less fuel with happy tennants. So far we're using 20% more fuel than the old boiler that had a simple thermostat with no other controls or warm-weather shut off.

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The differential on the rf207 is altered based on outside temperature thereby altering the cycle length. I have not tried installing a sf201

Is this calculation done only at your own house?The algorithm needs a bit of refinement, however. If you use the fixed wind chill values, all houses would have the same compensation for wind. However, we know that the wind component is dependent on the infiltration value for the heatloss. Therefore each building needs a different factor for wind.A very tight house with an ACH of .5 would have a different curve............markedly............than this place with an ACH of 1.5.

Calculating savings is tricky. At the very minimum, one has to take into account actual degree-day temperature information when doing the calculations.

Tekmar289

The Ecosteam allows me to adjust a curve to give extra boost for extra cold weather, and reduce it in very mild weather.

That would be the AH207?It appears to be a glorified thermostat with seven sensors. You only can control the boiler run time via the differential. Not a good control strategy.Now, the SF201 has a slew of interesting features and calculates run time in similar manner to the 279. It can only utilize two indoor sensors, however.

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