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    One problem with replacing the furnace is that...

    One problem with replacing the furnace is that it's a C width. The right furnace (60K btu or so) would be a B width. I don't want to change the evap coil but a C cased coil would look stupid sitting...
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    Wow. What a nightmare that would be. The bathroom...

    Wow. What a nightmare that would be. The bathroom wall, bathroom ceiling, and entire great room ceiling would have to go. After all that I'd still have an oversized system. It would be so much easier...
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    What do you think of the Rawal APR Valve?...

    What do you think of the Rawal APR Valve? Fascinating device. Just learned about it today.
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    You think maybe an ECM would wind up and over-amp...

    You think maybe an ECM would wind up and over-amp itself? I've seen them scream pretty good when a filter is clogged.
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    0.31" at the limit. So -0.49 and +0.31" is 0.8...

    0.31" at the limit. So -0.49 and +0.31" is 0.8 total with the filter. With a dry coil.
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    Am told Lennox has accounted for pressure drop of...

    Am told Lennox has accounted for pressure drop of the coil in their calcs. I can't really get a reading there without drilling a hole in the coil case. What are you getting at? It's probably losing...
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    I think the G41 was built better. Feels like...

    I think the G41 was built better. Feels like heavier metal. The ML193UH feels pretty light. Also mine has a 1/2 HP blower motor which could account for more noise. I think the blower wheel is 10"x10".
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    -0.49" on blower side of filter. +0.24 in supply...

    -0.49" on blower side of filter. +0.24 in supply plenum. As far as ESP, the Lennox Fan Performance Table says "minus filter". If I take readings without the filter I get 0.67 total ESP (-0.32" and...
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    What size? Mine is 110,000 BTUs with a 48C...

    What size? Mine is 110,000 BTUs with a 48C blower. ML193UH
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    I see. Never thought of that. Thanks!

    I see. Never thought of that. Thanks!
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    ESP is about 0.65" without the filter. Not good....

    ESP is about 0.65" without the filter. Not good. Lennox wants 0.5" max. With the 16x25 poly filter the return is -0.49" after the filter.
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    Could be, but If I turn it around then I will see...

    Could be, but If I turn it around then I will see down into the wall and that would not look good in the dining room. It's a low return on the wall. I had the contractor add that return because he...
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    That sounds like a great idea... but you haven't...

    That sounds like a great idea... but you haven't seen my house. I'd have to tear out a wall and half of the first floor ceiling to enlarge the 2nd floor ductwork. The 2nd floor ductwork is in the...
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    There's not much noise from the grills. There was...

    There's not much noise from the grills. There was a return grill that would hum so I took it off and installed strips of tape behind each louvre. It's quiet now. The thing thats undersized are the...
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    I'm not positive, but it could have something to...

    I'm not positive, but it could have something to do with the fact that the installing contractor put a 110,000 BTU furnace and 4 ton A/C in with enough ductwork for about 1,200 CFM all running...
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    Rescue EcoTech looks like exactly what I was...

    Rescue EcoTech looks like exactly what I was looking for. Awesome! Thanks for the info!
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    Convert PSC Blower Motor to ECM?

    I'm tired of my noisy PSC blower motor. It's 1.5 years old, nothing wrong with it, Lennox Merit furnaces are just noisy by nature. This is my second Merit system in a new home. The first one was even...
  18. That's a good idea. I usually work on commercial...

    That's a good idea. I usually work on commercial building systems where the wall is likely to be negative to the room, being connected with the open return plenum above the ceiling. In that case it's...
  19. Thanks for the document! That's exactly what I...

    Thanks for the document! That's exactly what I was wondering about and could not find. Fascinating.
  20. Now that my VP8000 is functioning well I decided...

    Now that my VP8000 is functioning well I decided to upgrade to the Honeywell Z-Wave version and give the other stat to a relative. This allows me to interface with the thermostat through my security...
  21. Thanks, BT. Looks like this is happening. The...

    Thanks, BT. Looks like this is happening. The wall is about 0.5 cooler than the air 1/2" away from the wall.

    I can't understand how 83K BTUs output can be so oversized for a 2,500 square foot...
  22. I reset it last night. That should work,...

    I reset it last night. That should work, especially if it logs data. I left out the fact that this was the thermostat used during my first year in the house. Then I took it out and replaced it with...
  23. Ok. I have the "C" wire, should I turn off power...

    Ok. I have the "C" wire, should I turn off power to the furnace and pull the batteries for 20 minutes? What does that do?
  24. Fascinating. Maybe it will get better as it goes....

    Fascinating. Maybe it will get better as it goes. It's not terrible now, just wish it was more stable coming out of recovery.
  25. You're talking about the "Adaptive Intelligent...

    You're talking about the "Adaptive Intelligent Recovery", where it calculates the start time based on degrees/time away from setpoint before the recovery period begins. I disabled that. I have it...
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