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  1. Your best option is to contract this out....

    Your best option is to contract this out.
    Barring that, yes you should turn the power off when you open a unit up, keeping in mind older units/buildings may not have disconnects at all aside from an...
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    360

    Do these DS's have a dehumidify function? Ie you...

    Do these DS's have a dehumidify function? Ie you have reheat strips etc?
    Have you verified the RH in the room with a separate sensor?
    Is there an economizer attached, or some other place for...
  3. That's the gist of it. That's how a properly...

    That's the gist of it. That's how a properly operating circuit would work.
    A proper circuit needs 3 things:
    Source, Path, and Load.
    A switch is not always necessary but it's your control point. A...
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    Once the winter comes your furnace probably won't...

    Once the winter comes your furnace probably won't even run. I've seen this many times before on "direct-vent only" units.
    Call them back and have the intake installed, withhold payment if possible.
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    344

    A service call is never a bad idea, even if its...

    A service call is never a bad idea, even if its just for maintenance. Doing a water test for ph and other contaminants will let you know what condition the system is in. A good boiler tech can offer...
  6. This can be avoided if using a common return in...

    This can be avoided if using a common return in the situation by splitting the duct with a divider up 6 feet from the blowers.
    2 furnace setups with common returns are very common here, the divider...
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    Lol, I love the title of the news story. "US...

    Lol, I love the title of the news story. "US power grid under assault"

    It's not. At all. Sensationalizing it sure sounds cool though!
    This has been a possibilty ever since the manhattan project,...
  8. This is what I want to know. We exclusively...

    This is what I want to know. We exclusively install Mitsu's, mainly for small server rooms and NEVER have a major failure, and rarely have serious breakdowns. These should run for 15 years atleast....
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    Maybe all those crazies hoarding all the .22LR...

    Maybe all those crazies hoarding all the .22LR are right.... The zombie apocalypse IS coming!
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    Actually the fatality rate of this current...

    Actually the fatality rate of this current outbreak is 68%
    They were over there trying to help.
    The flu has no cure and thousands die of that every year.... Maybe I should stop doing service calls...
  11. That's wrong. When you turn it on to "recover"...

    That's wrong.
    When you turn it on to "recover" it'll run for hours straight, well into the night probably. Unless your electricity is billed as time of use, and your day time rate is exponentially...
  12. Everything has a calculated life cycle, even you....

    Everything has a calculated life cycle, even you.
    For example, I know the button on my computer mouse was tested for one million "clicks", that's what the manufacturer deemed a sufficient measure of...
  13. So the -41 and -42 coils are the same coil for...

    So the -41 and -42 coils are the same coil for your purposes.
    The 37l51 will work for 1.5-3 tons and 39l72 is good for 3-5 tons.

    You're worrying too much! unless the system isn't working right,...
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    If you're measuring amps on the incoming power...

    If you're measuring amps on the incoming power wires, or at the compressor contactor, you'll likely never see even amp draws on the small package units. Generally manufacturers will use single phase...
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    917

    I'd take the frigid cold any day over the heat...

    I'd take the frigid cold any day over the heat we've had up here (Calgary, Canada)
    Last Wednesday it was 114 on the roof... I could barely handle it, and the phone was going nuts! 114 is well above...
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    575

    CPS makes them, but don't try to pull a vacuum...

    CPS makes them, but don't try to pull a vacuum with them, they don't seal!
    YJ also makes them, I haven't had a chance to test those yet under vacuum.
    Both hold well under pressure though.
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    So you have high, fluctuating head pressure, and...

    So you have high, fluctuating head pressure, and really high subcooling.

    Non condensibles?
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    291

    It'd be nice to see a libertarian candidate have...

    It'd be nice to see a libertarian candidate have a go anywhere in the world.
  19. Dissimilar gas appliances should be vented no...

    Dissimilar gas appliances should be vented no closer than 36" to each other.

    That's a no heat call waiting to happen
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    Why worry? The world is less than 10,000 years...

    Why worry? The world is less than 10,000 years old, so that so called "evidence" found in mountain sides and the like was planted there by the baby jeebus.
    I'm just gonna stick my head back in the...
  21. I use a micron gauge because it makes me feel...

    I use a micron gauge because it makes me feel good about my work to be honest.
    Pulling a vacuum is a poor way to check for leaks, as a pound or 2 of nitrogen is cheaper than the time spent trying...
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    1,679

    I'm not a fan. My boss bought 2 of them after we...

    I'm not a fan. My boss bought 2 of them after we had the electricians on a huge job cut the power to the circuit we were using to evac the first of 6 90 on splits we installed. Causing oil from my...
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    I can assure you the equipment made up here in...

    I can assure you the equipment made up here in Canada is made from the same parts that American equipment is made from.
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    1,183

    If the concern here is that a 1/4" line won't...

    If the concern here is that a 1/4" line won't feed a 3 ton system properly, who can a receiver fix this? I realize you'll be storing liquid right at the evap, but you still have to get the...
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    I once ran a mini split line set from an access...

    I once ran a mini split line set from an access hatch in an elevator room down 2 floors, through an air shaft and out a hole you could barely fit your hand through in a 40 year old office tower.
    ...
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