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  1. Replies
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    Running for less than 30 minutes is a bad idea....

    Running for less than 30 minutes is a bad idea.
    Moisture and acid are by products of combustion. And when the unit is running, these both get past the piston rings and into the engine oil.
    ...
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    Personally I go with the lower seer. However...

    Personally I go with the lower seer.
    However the higher seer will be more efficient.
  3. Unless it's a communicating system.... Outdoor...

    Unless it's a communicating system....
    Outdoor condenser and indoor unit will be compatible.
    You can have very slight efficiency gains using a matched system, but for the most part these...
  4. I'm in the camp of avoiding anything LG. I've...

    I'm in the camp of avoiding anything LG.
    I've never installed one..... but had to do a ton of repairs on them.
  5. As always, follow manufacturer recommendations. ...

    As always, follow manufacturer recommendations.
    However, heat strips usually don't care if the airflow is a little lower or a little higher.
    Most of the time I try to measure the...
  6. Sounds like they designed a better mousetrap lol....

    Sounds like they designed a better mousetrap lol.
    So you'd need power at your sensor just so you can convert the data to be able to be transmitted over fiber...
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    No experience with the field piece, but love my...

    No experience with the field piece, but love my g5 twin.
  8. You can use an A421 electronic stat to replace a...

    You can use an A421 electronic stat to replace a coil sensing stat.
    Put the probe in the coil and set it to shut off at 22 and come on at 37.
    Does the same job quite well.
    However, ...
  9. Replies
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    1,494

    How clean is the condenser coil? 14 above ambient...

    How clean is the condenser coil? 14 above ambient liquid line seems like it's not able to reject enough heat.
    Or... I've had fan blades mounted backwards for years
  10. Replies
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    Use less salt, a little vinegar and black pepper....

    Use less salt, a little vinegar and black pepper. Or as suggested a little pickle juice goes a long way.
  11. That's coil temp... if the coil can't get cold...

    That's coil temp... if the coil can't get cold enough to satisfy an a12 700 then there is something wrong with the system.
    And that's usually a plugged condenser
  12. I'll second the a12-700. It won't cut in again...

    I'll second the a12-700.
    It won't cut in again until the coil is above freezing. That's as idiot proof as you can get.
    Only issue with them is if the condenser gets plugged they'll freeze up.
  13. No experience with new carrier units. I'd choose...

    No experience with new carrier units. I'd choose trane over Lennox.
    However.... almost anything new isn't going to be as reliable as the older technology.
    And from what I'm seeing on rooftops...
  14. Well, if 64000 btu is enough for the house,...

    Well, if 64000 btu is enough for the house, because that's all you are getting out of it, then going bigger is a VERY big mistake.
    And you are likely to save roughly 15% on gas by upgrading.
    ...
  15. How well does your current 80k furnace heat your...

    How well does your current 80k furnace heat your home on the coldest days of the year?
  16. Pay attention to output btu.... 80kbtu at 80% is...

    Pay attention to output btu.... 80kbtu at 80% is 64000 btu heat put into your house.
    80k at 95% is 76 000.
    All quotes are effectively over sizing the furnace.
    In this case you really...
  17. Even Mitsubishi, Fujitsu and daiken are having...

    Even Mitsubishi, Fujitsu and daiken are having parts issues these days.
    However they at least back up their equipment.
    Midea is pretty good. But you gotta beware of the channel you buy them...
  18. Replies
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    Assuming installation is equal.... the only real...

    Assuming installation is equal.... the only real difference in an ac condenser is the type of coil it uses. ( based on same options and efficiency rating)
    This is where Trane stands out. They use...
  19. Replies
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    Having done a PILE of long lineset Mitsubishi...

    Having done a PILE of long lineset Mitsubishi units that have to hold below 500 microns for 24 hours with 3rd party verification.....
    Sometimes that pump has to run for almost a week to get a...
  20. Replies
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    443

    Microns not inches..... Anything less is a...

    Microns not inches.....
    Anything less is a waste.
    You've probably got a leak and are sucking vapor in...
  21. Replies
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    My favorite fir a basic stat is the Emerson 80...

    My favorite fir a basic stat is the Emerson 80 series
  22. Replies
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    588

    It's exceedingly rare that I'll use a hard start...

    It's exceedingly rare that I'll use a hard start kit.
    Most of the time it's on an old worn out system that has a worn out compressor to buy a little more time for the customer.
    Better off not...
  23. Replies
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    Zoning is something that is added to the ductwork...

    Zoning is something that is added to the ductwork along with controls.
    It will work without proper ductwork, however it won't reach anywhere close to its true potential.
    If I was doing...
  24. Replies
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    Realistically it should be upgraded to handle the...

    Realistically it should be upgraded to handle the full 4 tons.
    There are ways to limit with static pressure, but it's the cheap way out.
  25. Replies
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    In a perfect world 4 tons of cooling requires...

    In a perfect world 4 tons of cooling requires 1400 cfm at 0.5 static pressure.
    Your ductwork needs to be able to handle that. ( well honestly it needs to be close)
    As far as short cycling, ...
  26. Replies
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    A 4 ton variable unit running at 3 tons is...

    A 4 ton variable unit running at 3 tons is perfectly acceptable.
    That is..... provided your ductwork can handle the full 4 tons.
    The unit will ramp down that low. But ductwork is absolutely...
  27. As stated earlier.... the heat from the air...

    As stated earlier.... the heat from the air makeup is only tempered. It's NOT intended to regulate the building temperature.
    It only measures the incoming air temperature.
    If you are using...
  28. Yes discharge sensor is the typical solution to...

    Yes discharge sensor is the typical solution to the problem with this generation of control.
  29. Well in 2007 it would have still more or less...

    Well in 2007 it would have still more or less been the same system.
    However, just like computers gas valves and controls change and somewhat improve.
    So, updating to the newer system isn't...
  30. If the ac coil is affecting the flames.... You...

    If the ac coil is affecting the flames....
    You have a heat exchanger problem.
    A plugged ac coil can cause a heat exchanger to Crack pre maturely.
    However it seems like you need a fresh...
  31. And that's where it falls flat on it's face.......

    And that's where it falls flat on it's face.... if you own it, you it's your property and you can do with it as you wish.
    Now if parts are no longer available etc, or you can't find fuel for it,...
  32. And that's exactly why every install manual I've...

    And that's exactly why every install manual I've read tells us to let it run a minimum of 20 minutes before paying attention to sub cooling or superheat.
    I'd be pulling some charge and seeing...
  33. I like how they say you can't repair something...

    I like how they say you can't repair something that you own....
    That's a court case waiting to happen.
  34. Ok so it's a modern modulating maxitrol system. ...

    Ok so it's a modern modulating maxitrol system.
    You likely are due for a new discharge sensor if this unit has been running in snowy conditions. And I'd NOT be mounting the thermostat where...
  35. Doesn't have to be a specialist to maintain and...

    Doesn't have to be a specialist to maintain and repair a MAU. Just has to have an understanding on the sequence of operation.
    I don't have the model or serial of this unit , however I'll bet...
  36. Replies
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    Definitely look at changing the txv. These subway...

    Definitely look at changing the txv. These subway tables are a real pain. When this starts happening, txv is typically the cause, however most times you wind up replacing the compressor as well
  37. Yes if it's working properly you have no need to...

    Yes if it's working properly you have no need to touch it. They will "hunt" for temperature a bit when they first fire up. But that should last no more than a minute.
    You need to speak to your...
  38. Most systems running the maxitrol have both a...

    Most systems running the maxitrol have both a sensor and a thermostat.
    Most of the time the thermostat is inside the unit itself.
    And the discharge temperature sensor is just downstream of...
  39. Most of the ones I'm working on have the sensor...

    Most of the ones I'm working on have the sensor directly after the blower.
    But that's restaurant stuff.
    You can mount the thermostat anywhere you like. However if the temperature of incoming...
  40. Replies
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    If you lose power how will the thermostat access...

    If you lose power how will the thermostat access the internet to let you know?
  41. Either one will be fine.... on the other hand all...

    Either one will be fine.... on the other hand all new appliances seem to be junk
  42. Replies
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    Sounds like the unit either has a failed or mis...

    Sounds like the unit either has a failed or mis adjusted cpr valve. Or it needs one added.
  43. Replies
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    I don't replace them just on spec... unless I'm...

    I don't replace them just on spec... unless I'm installing a new condenser in a hard to get to area. In that case it gets an amrad turbo because some of these commercial installs are hard to get...
  44. Replies
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    I have thar ridgid cutter. But this one is...

    I have thar ridgid cutter.
    But this one is hands down better. It's a carbide cutting wheel if I'm not mistaken. I get roughly a year out of each wheel although I'm not doing many major installs...
  45. Replies
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    Try buying a variable speed blower motor..... ...

    Try buying a variable speed blower motor.....
    The last furnace I replaced was a 6 year old Goodman over a blower motor failure.
    I bought a new furnace for less than the price of the motor
  46. Replies
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    The price of major parts on Goodman/ Amana isn't...

    The price of major parts on Goodman/ Amana isn't pretty
  47. Replies
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    Try the master cool. Cast iron body, roller...

    Try the master cool. Cast iron body, roller bearings inside the cutting wheel.
    Yup you still gotta lube the theaded adjuster.
  48. Replies
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    I'm really happy with my mastercool cutter. ...

    I'm really happy with my mastercool cutter.
    USA made, roller bearings for both the cutting wheel and support wheels, and the cutting wheel stays sharp a long time.
    Only thing I don't like...
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    I'm a firm believer in getting the last of the...

    I'm a firm believer in getting the last of the older technology.
    There will be a learning curve for manufacturers, installing contractors and service personnel with the new refrigerants.
    ...
  50. My unpopular opinion is that if a flame sensor or...

    My unpopular opinion is that if a flame sensor or thermocouple faults.... it gets replaced. Not just cleaned
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