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  1. Replies
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    Confused, all these temperatures are below...

    Confused, all these temperatures are below freezing
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    Lennox does have tech help. Ask your dealer. ...

    Lennox does have tech help. Ask your dealer. The thermostat is the brains of the operation, I'm pretty sure. No direct communication AHU to DCM
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    Dirty coil. Too high velocity air flow.

    Dirty coil. Too high velocity air flow.
  4. It is possible, there is a crazy shortage. Three...

    It is possible, there is a crazy shortage. Three year old leaking that bad?. Not a typical type of manufacture defect. I would look for a screw puncturing the coil. Aluminum solder is easy with...
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    Need diagnostic mode test and maybe a call to...

    Need diagnostic mode test and maybe a call to Lennox tech support..
    Note that there is only one air source (AHU) if it is blowing cold in one zone, all the other zones that blow will be cold. One...
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    During icy weather, what is tubing fluid...

    During icy weather, what is tubing fluid temperature is circulating?
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    Yea,I thought of that. But how do the sidewalk...

    Yea,I thought of that. But how do the sidewalk ice melters in snowregions keep from damaging sidewalks?
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    Conversely, how much heat would it take to raise...

    Conversely, how much heat would it take to raise concrete surface to 115 degrees if you have 75 degree fluid.
    Just think in reverse to figure how much heat you can obtain from hot concrete
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    pool deck heating

    Live in Texas.
    I want to know how to calculate heat gain on a hydronic system that is imbedded in the pool deck. Sun warms the deck quite a bit in the spring while pool water is cool. Like to use...
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    Some lesser brands are well built too, but there...

    Some lesser brands are well built too, but there is no parts available outside of Asia. Had a customer that needed a fan motor. No suppliers in USA. Only option was to replace system.
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    Anyone being charged a "temporary inflation fee"?...

    Anyone being charged a "temporary inflation fee"? No one can tell me how temporary or what it is tied to.
  12. Pull all the low voltage wires off. Rewire like...

    Pull all the low voltage wires off. Rewire like schematic shows. Except stat Check operation at stat subbase. Then add the NEST "c" wire adapter back. This is simple
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    Carrier north texas

    Anyone having issues with working with carrier around here?
    Cannot communicate or resolve anything on the phone. Ce app sets up ship date, then you get an email saying parts are back ordered after...
  14. Model 50ah036330 is old model

    Model 50ah036330 is old model
  15. Carrier room-top NOT rooftop ac equipment

    Carrier had a product that is a small package unit designed for above ceiling mounting called roomtop. Ducted condenser and evaporator in one inside unit designed for multistory building
    I cannot...
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    Engineer specing r4.5 duct insulation? Thought...

    Engineer specing r4.5 duct insulation? Thought r6 was minimum required, r8 in unconditioned attics.
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    I am not a fan of any return ductwork in the...

    I am not a fan of any return ductwork in the attic. Picks up unnecessary attic heat. Larger returns in main rooms. If a door is in the way, add a room to room jumper.
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    Engineer specing r4.5 duct insulation? Thought...

    Engineer specing r4.5 duct insulation? Thought r6 was minimum required, r8 in unconditioned attics.
  19. There may be a feeling that it is safer or makes...

    There may be a feeling that it is safer or makes practical sense to remove abandon equipment but it must be backed up by a published code requirement or law.
  20. Must be an error. Also a direct short

    Must be an error. Also a direct short
  21. Reading the schematic, looks like a 120 volt...

    Reading the schematic, looks like a 120 volt heater, on leg tied to the ground. That’s illegal
  22. Without cch, cold compressor has liquid...

    Without cch, cold compressor has liquid refrigerant that doesn’t compress as gas would. Compressor stalls. Heater “boils” liquid and turns it to a gas that the compressor can pump.
    Allied tech...
  23. Had similar issue with inverter heat pump....

    Had similar issue with inverter heat pump. Armstrong manufacture. Intermittent locked rotor error. Simply, it was bad cch.
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    If old system was upflow electric furnace and new...

    If old system was upflow electric furnace and new code required heat pump,the drain outlet is now a lot lower and may not have enough pitch compared to the old system. That may be why a pump was...
  25. You sound like engineer type. Have tech hook up...

    You sound like engineer type.
    Have tech hook up a hour meter to strip heat stage-or even an old electric clock will do. Have electrician add a voltage monitor to circuit that controls system...
  26. smaller duct matches the 4 ton load better. Keeps...

    smaller duct matches the 4 ton load better. Keeps velocities up. Better air distribution. Maybe 5% time system will ever run at 5 ton capacity.
  27. Why would the ductwork be undersized if system...

    Why would the ductwork be undersized if system requirements only throttle to 4 ton?
    Airflow will be less at 4 ton cooling load
    New system. I hope ductwork was inspected
  28. Have a pro check. It may be simply a disconnect...

    Have a pro check. It may be simply a disconnect duct in the attic
  29. Years ago I researched the efficiency lost from...

    Years ago I researched the efficiency lost from hail damaged condenser fins
    I was surprised at how little efficiency lost with very damaged condenser coil

    Probably no loss of efficiency if the...
  30. There is always a risk of hitting a wire or a...

    There is always a risk of hitting a wire or a pipe when we drill into walls. Best bet is to fully document paperwork when you sell the house. Use nail plates when required. (Again, it is in the...
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    20 seer unit buys you comfort, but not much worth...

    20 seer unit buys you comfort, but not much worth it if energy savings are your goal. Way too complicated and technology will make it obsolete in short time. Take $5000 and use it to maintain AC...
  32. All these graphics and no comments! A Pipes can...

    All these graphics and no comments!
    A
    Pipes can be concealed. Check UMC books to determine drain pitches and pipe sizes, supporting and material used. All your answers are there.
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    You need to remember that running backwards will...

    You need to remember that running backwards will work for a while. After 5 minutes, reverse running compressor may shut down because of overheating. Then it will restart and run like nothing ever...
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    Working with 3 phase made me more aware of a...

    Working with 3 phase made me more aware of a reverse running compressor. Taking manufacturers courses discusses how a scroll works, or doesn’t.. 45 years in the industry.
    Hvac talk is full of...
  35. Replies
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    I will report that we added a "C" connection to...

    I will report that we added a "C" connection to the nest stat. Problem went away, Thanks for all your insights.
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    Hey, the customer has trouble shooting...

    Hey, the customer has trouble shooting instructions that I prepared. What to look for and when it happens. What to do, then what happens. She is a real help. I think the power robbing Nest stat...
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    I didn't know if 240 volt power was the issue.

    I didn't know if 240 volt power was the issue.
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    Ran accross this post by cmorris last year. HO...

    Ran accross this post by cmorris last year. HO has a nest and no "C" connection
    Ran across American Standard doing same thing. The Nest he had was a power robbing stat, my meaning is the Nest...
  39. Replies
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    Fustrating scroll running backwards

    I have a 5 year old Lennox that customer claims it stops cooling every few days. I think it is running backwards at that time. She breaks the circuit for 2 seconds and it will cool properly. I can...
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    Piping charts give an equivelent length value for...

    Piping charts give an equivelent length value for all types of fittings. Just like duct calcs.
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    It is your ethical duty to install correct cap. ...

    It is your ethical duty to install correct cap. Ho is paying a lot of money for your expertise and if the wrong capacitor cause the compressor to fail even a day sooner, that is cheating the...
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    Why two 1/4” taps? See you already have a high...

    Why two 1/4” taps? See you already have a high limit piped in.
    Very nice job
  43. Replies
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    My bet is on breaker lugs are weak. We always...

    My bet is on breaker lugs are weak.
    We always flip cu disconnect off then on to see what reaction we get on calls like this. Try to see if compressor will stall and if breaker will not trip.
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    Lower blower speed allows more humidity to be...

    Lower blower speed allows more humidity to be removed from the air while not dropping the temperature as quickly. It is because the coil is colder at low
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    better humidity removal with longer cooling...

    better humidity removal with longer cooling cycles, so low is prefered to remove humidity. You can wire a humidistat to force system in low blower speed with high speed cooling with a relay.
  46. I would bring a second motor to be sure.

    I would bring a second motor to be sure.
  47. Replies
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    Walk in freezer- equipment only

    1.5 ton low temp freezer CU and evap coil.
    Heatcraft.

    230 volt 3 phase 404a824732824733824734\

    I have had this in storage 15 years, not used. System was been sealed and with a pressure gauge....
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    I never make claims on uv lights or ion guns. I...

    I never make claims on uv lights or ion guns. I let the slick literature make the claims. If I can,t show HO has cleaner air, I really can,t defend the product.
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    Humidity values

    I was asked how much the humidity will drop with a dehumidifier I sold a customer.. Im not sure how to figure that. I know dehumidifier rating
  50. Good point, but older conventional walk-in...

    Good point, but older conventional walk-in compressors often overload on start-up. CC regulator keeps it under control. I don't see much anymore on scroll cooler CU.
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