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  1. Sounds correct. Some units take 3-5 minutes to...

    Sounds correct. Some units take 3-5 minutes to ramp up it seems like.
  2. I'm not saying it's right. No manufacturers of...

    I'm not saying it's right. No manufacturers of inverter mini splits will ever give you a method for charging their units other than weigh in. It seems to me as long as you have enough liquid at the...
  3. I never weighed in charge- ever. These units have...

    I never weighed in charge- ever. These units have an EXV that controls superheat pretty much like a mechanical TEV. The suction temp is taken by a thermistor at the end of the evap and communicated...
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    Well, this is weird. I took a test once that...

    Well, this is weird. I took a test once that asked the question: What is the voltage to a Hot Surface Ignitor?" The answer: 120 volts. Period. Not 80 OR 120. Why would these silly engineers feel the...
  5. ^ Albuquerque has a low temp location?

    ^ Albuquerque has a low temp location?
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    Rereading, you have the high limit set at 130....

    Rereading, you have the high limit set at 130. And it's running up to 190. So your high limit is being bypassed by something in the controls for the DHW call. Not good at all.
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    I added some more info above. Is the high...

    I added some more info above.

    Is the high limit being bypassed on a call for domestic water heating?
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    Can you wire the IDWH to the Taco panel as a zone...

    Can you wire the IDWH to the Taco panel as a zone rather than direct as an override? It sounds like your IDWH does not require the full capacity of the boiler.

    If it worked this way before I'd...
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    A 120 volt ignitor would not get as hot and...

    A 120 volt ignitor would not get as hot and therefore should last much longer. The board shouldn't care, it's just a dry contact that closes and sends power to the ignitor. I thought all ignitors...
  10. ^ What he said! We only sell them for computer...

    ^ What he said!

    We only sell them for computer and elevator equipment rooms, and other cooling only applications. Some of them won't even cool when it's below 0 ambient. We did install some Trane...
  11. Creative Condensing Unit Modification

    It's winter but I'm thinking ahead. I've decided I'd like to downsize my cooling capacity in my house. The unit is obviously oversized, as it drops the temp about 2F after running for 5 minutes. For...
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    That is some NASA level programming just to...

    That is some NASA level programming just to determine how many stages of cooling to run! Any idea what spCCPH is used for? I'm guessing cooling cycles per hour? It's set to 0.0011.
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    You guys rock! That worked. The first time I must...

    You guys rock! That worked. The first time I must have done something wrong because it told me I was missing a .hdr file.

    So the input to the cooling stages control loop is a math function, which...
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    Honeywell RapidZone Issue

    I've never really had to mess with a RapidZone system before. They usually just work. This one does some things I'm not liking, and I think it's primarily because the RTU is oversized.

    It's about...
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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.
  18. Replies
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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...
  32. 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...
  33. 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.
  34. 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...
  35. 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...
  36. 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...
  37. 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?
  38. 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.
  39. 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...
  40. I had the CPH set to 5, but it seemed like the...

    I had the CPH set to 5, but it seemed like the cycles were too short. Like 3 minutes. So I tried 4 and the cycles were too long, like 8 minutes. So I put it back to 5. Now the cycles vary from 3-8...
  41. Ah, Thermistor. I wondered about that. If it is...

    Ah, Thermistor. I wondered about that. If it is giving flaky readings it could cause that. A PSG stat I had in a condo was doing that.

    DeltaT- I hope you're right. Nothing has been changed for 3...
  42. There's no anticipator on a digital stat. It's...

    There's no anticipator on a digital stat. It's all mathematical algorithms. Averaging calcs, PID loops and such. I wish I could see Honeywell's programming code inside this thing.
  43. It's manual changeover. Heating mode 24/7 for...

    It's manual changeover. Heating mode 24/7 for now. Here's an example. At 8:00 AM this morning the outside temp was 25. It went on at 8:05. Off at 8:13. Then on at 8:21, off at 8:27. On at 8:50,...
  44. Why the huge furnace? Great question. I was told...

    Why the huge furnace? Great question. I was told second hand that the builder forced the contractor to do that. He was going to put a 5 ton A/C in as well and I made him drop it to 4 tons. Probably...
  45. Does Anyone Understand the Magic Alorithms of the VisionPro 8000?

    Maybe this should be in "Controls"...

    I've programmed many EMS systems. Controlling space temp using a split system is a piece of cake. In heating, if the space temp setpoint is 70, the furnace...
  46. This was very common in some older drives....

    This was very common in some older drives. Supposedly the new drives are immune to it. But I always stop the drive before opening the disconnect because I have better things to memorize than which...
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    Our local Honeywell dealer has such a guru and he...

    Our local Honeywell dealer has such a guru and he knew about that. Works great! Is it just me or are controls getting worse and worse every year? I like the older stuff. It just works.
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    That's exactly what I want to do. The house is...

    That's exactly what I want to do. The house is (will be) in Nebraska. About 1630 Sq. feet, single story, R-18 walls, concrete basement. I'd like to use the 45 MBTU furnace and 2 ton A/C. What I don't...
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    Thanks Pepperidge, that's exactly what I was...

    Thanks Pepperidge, that's exactly what I was looking for!

    Now I'm wondering what he means when he says that it "runs at a lower speed so it has fewer starts and stops." Why would it have fewer...
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    Lennox Power Saver Motor

    I did a search and could not find anything on the forum but it must be here somewhere...

    I have two questions regarding Lennox furnaces. I'm considering building another house and want to get the...
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