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  1. Replies
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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.
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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!
  14. Replies
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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!
  20. Replies
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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...
  21. 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...
  22. 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.
  23. 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...
  24. 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...
  25. 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...
  26. 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?
  27. 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.
  28. 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...
  29. 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...
  30. 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...
  31. 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.
  32. 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,...
  33. 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...
  34. 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...
  35. 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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    Are you actually checking the cut-out/cut-in...

    Are you actually checking the cut-out/cut-in pressures or did you just go by the scale on the control? They are usually not very accurate. Bypass the low pressure control, let the system stabilize,...
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    Looking at the cost of living in MA I suspect the...

    Looking at the cost of living in MA I suspect the garbage men would have to make 6 figures. Here in Omaha that's a nice income! I don't know, I still haven't made up my mind whether to accept this...
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    Thanks for all the insights, jlaber! I think it...

    Thanks for all the insights, jlaber! I think it will be years before we get to the point where I'm doing programming all day. A steep learning curve doesn't excite me at all. We're a residential HVAC...
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    My company wants me to get our new controls...

    My company wants me to get our new controls division up and running (it currently doesn't exist) using these new Spyder controls with the AX front end. The last controls I worked with was Tracer...
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    Pull it out of the window and install a...

    Pull it out of the window and install a Mitsubishi inverter mini split, problem solved. The only good window unit is in the scrap pile, imo. But yes, it does look like a form of liquid injection. I...
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    Thanks, Kev. I will try that. I found that using...

    Thanks, Kev. I will try that. I found that using the "Compatibility View" solved this issue.

    I still hate Webvision. Today I was making some changes to an XL15C Plant Controller using Webvision....
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    Webvision Errors and Problems

    Hi All,

    I have a Webvision installation that was done less than 2 years ago that plagues me constantly with many odd issues that our Honeywell rep doesn't seem to have answers for. The system...
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    Thanks ascj! That's exactly what I was looking...

    Thanks ascj! That's exactly what I was looking for. I found that an Integral time of 300-600 seconds (depending on equipment sizing) with a TR around 3 gives decent space temp control.
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    Honeywell XL15C Flex PID

    I'm new to this controller, and trying to figure out the PID tuning. Honeywell's Help file in LonSpec could not be more vague.

    Simple question: What does the Integral Time in Seconds refer to? Is...
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    20x20 on a 5 ton is going to produce a hurricane...

    20x20 on a 5 ton is going to produce a hurricane of return air.
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    I just did some ductulator calcs. It actually may...

    I just did some ductulator calcs. It actually may work. The return FPMs are a bit high (955) in a couple areas but it's much better now after adding two 8's on the main.
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