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Joined on September 30, 2012

Last Post on June 26, 2014

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@ February 17, 2014 12:08 AM in Wood heat transfer

I think the OP is talking about a wood furnace, not a stove. Why not distribute the heat in the same manner as the current furnace?

sounds crazy

@ February 16, 2014 6:44 PM in Wood heat transfer

I think it would be terrible.

what do you mean by "cannot be inhabited"

@ February 15, 2014 8:14 PM in Solar Thermal is Dead

People are all over the area, they just don't live there 24/7. These areas are quickly becoming recognized as natural parks.

Grid level solar thermal is an excellent power source. Residential typically does not warrant the investment necessary for conversion to electric, and this dramatically reduces it's potential.

The alternatives

@ February 15, 2014 8:00 PM in Kickstart THIS!

are quite expensive?


@ February 15, 2014 7:11 PM in Solar Thermal is Dead

Let me temper my optimism. Current nuclear is tremendously wasteful and moderately dangerous. But, it's wrong to brand all nuclear technology in this light. Just like chemistry, biology, mechanics, etc, there are areas of nuclear that are essential, safe, and promote the wishes of mankind.

yes, dead

@ February 15, 2014 6:55 PM in Solar Thermal is Dead

Radiation is natural, you are being bombarded with it continuously. Solar is radiation too. The issue is quantity. Japan's environment will benefit in the long haul dual to the exclusion zone. People cause much more harm to the environment than radiation.

solar is more dead

@ February 15, 2014 6:35 PM in Solar Thermal is Dead

"dozens of birds" really isn't that unusual. Artificial night illumination causes the same problem.

Nevertheless, advanced nuclear is the way forward for baseload.

Kickstart THIS!

@ February 15, 2014 5:55 PM in Kickstart THIS!

I'm curious to hear what other ideas people would consider supporting via crowd funding. Smart vents that ensure balance? Variable EDR radiator valves? ???

What's missing from modern steam?

I think I follow you

@ February 15, 2014 12:47 AM in Are 2 zones more/less efficient?

I think I follow you,

It sounds like you are describing the typical zone sync that systems such as tekmar and honeywell provide for hydronic systems. All demands start together, but end at different times.

That's certainly better than random independent heat calls, but one is still stuck with twice the boiler, twice the near boiler piping capacity, and twice the cycles that the building really requires. That seems much worse than a smaller boiler cycling half as often.

somewhat related

@ February 14, 2014 1:11 PM in Are 2 zones more/less efficient?

Let's say the system has twice the edr needed after envelope improvements. Perhaps a zoning strategy could allow one to install a boiler that was sized for half the edr? For example, suppose one implemented a cycle based system set a 1 cph. Zone 1 (with half the edr) leads the call for heat and is allowed up to 30 minutes of runtime, at which point the load is immediately handed off to Zone 2. The sequential calls eliminate extra cycles, and the boiler output matches the edr of the zone.


test button

@ February 12, 2014 12:40 PM in Tekmar Second Stage Heating Problem

Take a look at the manual. Page 13, Testing the Control. You might also try setting a lower mix 1 max temporarily. One would hope that it would obey that limit and throttle back the pump.


@ February 11, 2014 12:23 PM in Tekmar Second Stage Heating Problem

Mix 1 target is 79? (not 97?) And overshoots to 100 right when the boiler shuts down?

hard time

@ February 11, 2014 1:16 AM in Logamatic 2107 or Tekmar 260 ?

How can that be more economical? I know nothing of the Logomatic.

temperature spikes

@ February 11, 2014 12:44 AM in Tekmar Second Stage Heating Problem

"I checked the 422 temps this morning during a heat cycle. Amb. is 23, Mix1 Targ was 124, Mix1 Act. overshot to 140 before the boiler shut down. Boiler Targ was 141 and Act reached 147 before shutdown. Floor Temp stayed at 85. I noticed that the Mix1 injection pump was running wide open the entire cycle."

It looked like the radiant zones are down stream of the air zones on the primary loop. Perhaps the tempered supply during a simultaneous H2 call is enough to force this injection pump to 100%. But that doesn't really jive if you are getting actuals higher than target.

When you say Mix 1 over shoots, does it spike right before/after boiler shut down, or spike after an H2 end, or does it climb over the cycle irregardless of the status of anything else?

Regarding the boiler temp target overshoot, that just sounds like the boiler differential.

floor max

@ February 10, 2014 12:34 PM in Tekmar Second Stage Heating Problem

If you're at floor max, I can't see things changing too much for the current weather.


@ February 10, 2014 11:52 AM in Tekmar Second Stage Heating Problem

This is with Boil Min set back to off?

Tony Fadell

@ February 9, 2014 11:36 PM in Meet The Cozy

I think they really wanted Fadell and his team. He headed the iPod team while at Apple. The success of Nest establishes their track record in the electronic product consumer design sphere. Google hasn't had much luck with real hardware.

I also think it will sell well.

@ February 9, 2014 10:17 PM in Meet The Cozy

Probably will have a bigger impact than the Nest.

What exactly did you change?

@ February 9, 2014 9:54 PM in Tekmar Second Stage Heating Problem

Outdoor Design, or the Mix 1 Design, or Mix 1 Indoor? That's the typical coldest day temp, the expected water temp on coldest day for mix 1, and the typical desired indoor air temp.

design temps and more

@ February 9, 2014 7:32 PM in Tekmar Second Stage Heating Problem

With indoor feedback, I kinda expect small adjustments to the design temps to have very little impact. The feedback loop is there to correct errors in the ODR curve, and I think it would eventually override your adjustments. But try it and see what happens.

If you adjust the mix 1 minimum higher, my fear is that the 543 will have less control over the floor. I suspect it may recognize this and reduce the rooms dependence on the HFR2 heat source resulting in more hot air and an on average cooler floor. Basically the opposite of what was wanted. But try that too and see what happens.

those are her threads

@ February 9, 2014 7:11 PM in Bleeping blinking lights - what do they all mean??

I posted it here so people had easy access to the previous information.

just reading through the manual

@ February 9, 2014 6:29 PM in Tekmar Second Stage Heating Problem

At a minimum, it looks like there would be some sensor errors if you enabled Mix 2 without a 440 mix expansion module on the bus. Frustrating.
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