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  1. Mine does that at 1:00 every afternoon. But I...

    Mine does that at 1:00 every afternoon. But I don't believe it has the ability to see the static pressure on the far side of the filter -- only the input and output sides of the fan. So it wouldn't...
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    Not really. With an MCA of 57 amps, I was able to...

    Not really. With an MCA of 57 amps, I was able to use #6 copper at its 75C rating (which is only 2 amps over its 60C rating). But voltage drop should be calculated from the actual load and not the...
  3. Hmmm, didn't think it worked that way. I've done...

    Hmmm, didn't think it worked that way. I've done some things to my evolution system since it was installed to lower static pressure and it has never complained. Did some other things that increased...
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    I don't believe there is a limit of 60A branch...

    I don't believe there is a limit of 60A branch circuits (residential or otherwise). But there is a requirement for many things with heating elements to have their loads subdivided into 48A segments...
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    Or was the flow hood round so its 12.6 sq...

    Or was the flow hood round so its 12.6 sq inches...

    Back to the original question. Who knows if the system is balanced. If you calculated the heat loss/gain on a per room basis, you should then...
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    And don't forget about air velocity in the trunk...

    And don't forget about air velocity in the trunk too. Even if the pressure loss is low, there is a speed limit for air. Once you know the CFM of the trunk between each takeoff, you can choose the...
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    In general, yes the total return pressure drop is...

    In general, yes the total return pressure drop is the same whether the filter is at the furnace or the return grill. But if you're trying to filter micro particles, putting the filter at the grill is...
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    Update. It was cold again this morning so I could...

    Update. It was cold again this morning so I could try another test. I confirmed that cycling the power on just the air handler will make the unit defrost one time after the 30 minute timer goes off....
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    Its a 698B. Outside air temp was 37F and coil was...

    Its a 698B. Outside air temp was 37F and coil was 26F when I reset the defrost to 30 minutes. After 30 minutes it was down to 11F coil temp, and 10F after an hour. Never went into defrost that entire...
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    Private Messaging

    I didn't see a help on how to use forum, so I'm posting here. How do you get private messaging to work? Other forums, and the FAQ here, say that "Send a Private Message" should appear when you click...
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    I think only the board was replaced and not the...

    I think only the board was replaced and not the sensors, but the reported temperatures seem to always make sense. I left you a Visitor Message. Can't seem to get PM's to work unless Visitor Messages...
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    Outside air temperature was 37F, so I'm well...

    Outside air temperature was 37F, so I'm well below that limit. Since the defrost board was replaced, what else could be wrong? It seems it has to be one of the inputs to the defrost board or somehow...
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    Infinity/Evolution Defrost

    I'm having a problem with my Bryant Evolution heat pump failing to defrost. The tech replaced the "defrost and temp sensor board" in the heat pump because there were temperature range errors logged...
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    Does your thermostat give any indication of when...

    Does your thermostat give any indication of when those heat strips are on (it could light up the emergency heat light, it could have an aux heat indicator, or it could tell you nothing)? You need to...
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    Here's my spreadsheet as a Word document (can't...

    Here's my spreadsheet as a Word document (can't upload a .xls file). It's kind of embarassing, but it tells me what I need to know. An online energy calculator would be better.

    This sheet assumes...
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    I made a spreadsheet a while back that compares...

    I made a spreadsheet a while back that compares fuel costs. At about 7 cents per kw-hr, gas would be cheaper if it was less than $1.10/therm. Since yours is higher than that, electricity will be...
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    It is not a concern, but it is an ignored factor...

    It is not a concern, but it is an ignored factor which would affect the calculated result versus the actual result. I think it is right to ignore it for heating. But the OP asked why his actuals and...
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    I believe another factor ignored by Manual J (and...

    I believe another factor ignored by Manual J (and perhaps HVAC Calc, haven't used that), is the heat generated by electrical appliances in your house. They do have a factor for that in cooling, but...
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    I measure static pressure by reading it off the...

    I measure static pressure by reading it off the thermostat... (Bryant Evolution). Before I had that system installed, I bought a Dwyer magnehelic kit, which I think was about $30. Using it, I felt my...
  20. There is nothing wrong with exposed NM cabling,...

    There is nothing wrong with exposed NM cabling, that is a permitted use. It needs to be protected from damage, and what constitutes that is up for the inspector to decide (and their interpretations...
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    Unless you want freezing air coming out all the...

    Unless you want freezing air coming out all the ducts during defrost (about 10 minutes of every hour all winter long), install the 10 KW strip. Here in Seattle, my HP frosts very easily when the...
  22. It is in the definition of relative humidity....

    It is in the definition of relative humidity. Lets say your winter outside air at 0F has 50% humidity. When you heat that air, it is able to hold more moisture. But unless you add some moisture, its...
  23. Note that the airflows to the 1st or 2nd floors...

    Note that the airflows to the 1st or 2nd floors relate to heat loss or gain and not volume. Perimeter length and amount of windows have the most influence. Also, the second floor has losses through...
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    Windows can make a huge difference. Changing them...

    Windows can make a huge difference. Changing them made a heat pump possible for me (reduced heat loss by over 12000 BTU). The difficulty is knowing what the U value and SHGC are. When my new windows...
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    The nameplate value will correspond to the...

    The nameplate value will correspond to the running amps of the heatpump. However, if the nameplate says "minimum circuit ampacity" or MCA, then there is a 125% factor for continuous use. I'd take the...
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