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  1. Replies
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    This always confuses me but motors are inductive...

    This always confuses me but motors are inductive loads and don't follow ohm's law for resistance...Resistive loads volts go down amps go down...Inductive loads volts go down amps go up???? Not...
  2. I agree completely. from another thread... ...

    I agree completely.

    from another thread...



    This is a fairly simple diagnosis for someone with all those credentials...:eek:
  3. Replies
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    614861 4 Wire vs 3 Wire...HVAC101...

    614861

    4 Wire vs 3 Wire...HVAC101 topic...Sorry I didn't draw it out in crayon for you earlier...I read both of the threads you are involved in and its pretty clear the problem is you...:eek:

    I...
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    Wow someone wants to have a dick measuring...

    Wow someone wants to have a dick measuring contest...If you don't know what a three wire motor is vs a four wire, I can promise you, you aren't qualified to carry my tools...You know nothing about...
  5. Looking at the manual just now it seems there is...

    Looking at the manual just now it seems there is separate O/B/W terminals...I was thinking there was one terminal that the operation had to be setup in the configuration or jumpers.

    If O isn't...
  6. Yikes he was the business owner? Also it doesn't...

    Yikes he was the business owner? Also it doesn't get more cut and dry then this. :eek:
  7. T stat isn't programmed to be a 2 stage hp with a...

    T stat isn't programmed to be a 2 stage hp with a cool activated(O energized in cooling) reversing valve...There is more to do then just wire it...:eek:
  8. that was the first thought that popped into my...

    that was the first thought that popped into my head, but I have had several run ins with the law and at this point I avoid flashing lights like the plague...:eek:
  9. Replies
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    Also two black wires for L1 and L2? Almost sounds...

    Also two black wires for L1 and L2? Almost sounds like a multi tap 460 motor where for low speed yout have to add two wires together with a wire nut...A picture of the motor data plate would be...
  10. The first thing to do is look at the words in red...

    The first thing to do is look at the words in red at the top of this forum...The second thing is to brace yourself for all the "call a professional" replies...Third thing, and this is only if you are...
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    He's obviously not capable. After several...

    He's obviously not capable. After several contradictory posts and even saying it's wired to a schematic I linked a picture of, that it's clearly not we are here arguing amongst ourselves...This...
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    I promise you if you ask 100 techs why the blower...

    I promise you if you ask 100 techs why the blower motor failed you would get 200 different answers...

    At the end of the day we have an obligation to provide all the facts to the homeowner and let...
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    This is an open forum...The professionals on here...

    This is an open forum...The professionals on here take there responsibility seriously...Obviously the OP doesn't understand single phase motors...If this was in the pro forum commercial we would have...
  14. Replies
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    Beating a dead horse at this point. :eek:

    Beating a dead horse at this point.


    :eek:
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    For the record superheat/sub cooling only work...

    For the record superheat/sub cooling only work and should be a metric to evaluate a system when you are in the same neiborhood as the ballpark of readings you expect...The 0 psi suction pressure is a...
  16. Replies
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    The fact that this motor involves l1 l2 and l3 at...

    The fact that this motor involves l1 l2 and l3 at the same time is wrong...:eek:
  17. Replies
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    I'm confused...:eek:

    I'm confused...:eek:
  18. But there are only three parts left until he has...

    But there are only three parts left until he has a new unit...why stop now...:eek:
  19. Replies
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    Is it wired like the one on the left ? :eek: ...

    Is it wired like the one on the left ? :eek:

    http://www.industrial-electronics.com/image/12-49.jpg
  20. Better tools look better, but actually knowing...

    Better tools look better, but actually knowing how to use them is more important...:eek:
  21. Replies
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    It's either a single phase motor with a cap or a...

    It's either a single phase motor with a cap or a three phase without one...You don't switch the start winding...:eek:
  22. Unfortunately I am a lame American that doesn't...

    Unfortunately I am a lame American that doesn't speak metric...:eek:
  23. So you have < 2 cups of water, no source of heat...

    So you have < 2 cups of water, no source of heat gain, and a flood back condition. I am going to have to think long and hard about why that's happening...:eek:

    Just out of curiousity what's the...
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    Parts houses sell just the ball valve with a 1/4"...

    Parts houses sell just the ball valve with a 1/4" male on one side and female on the other and the ball valve is removable...they cost like 6$. Easiest way to fix them rather then a 110$ set of...
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    For the record pump oil breaks down due to heat...

    For the record pump oil breaks down due to heat and then the pump isn't as effective...Thin oil is a reason to change it for sure...Once it heats up on the next evacuation I dump it and replace it...
  26. Replies
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    Semantics and irrelevant in this case the...

    Semantics and irrelevant in this case the difference between a pumps and a compressor...The point is RLA is based on what the system is design to do...:eek:
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    If its not settings and not the motor I would...

    If its not settings and not the motor I would check the output with a scope and see if all three igbt's are balanced.

    There is a way to force the autotune on the motor. If the drive is OK I would...
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    Is this from a dead stop or is the fan spinning...

    Is this from a dead stop or is the fan spinning backwards? If the drive doesn't have enough torque to start the wheel or reverse it if it's running backwards you will get that fault...:eek:
  29. There is a lot of stuff in there that can get you...

    There is a lot of stuff in there that can get you killed. Also this isn't a DIY site...it's just the site rules...pro status mean we can talk tech to tech...:eek:
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    I know lots of people do it, but I feel you...

    I know lots of people do it, but I feel you should have to turn in your pro status if you rely on some temp over ambient for charging...:eek:
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    That might be for fuses and breakers. I just deal...

    That might be for fuses and breakers. I just deal in what a particular manufacturer expects their machine to do...engineering is for engineers and the engineering was done long before I see a...
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    Compressors are pumps and pumps have performance...

    Compressors are pumps and pumps have performance curves. running amps depend on where on the curve that compressor operates...:eek:
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    LOL I was thinking the same thing when I first...

    LOL I was thinking the same thing when I first saw the picture...:eek:
  34. Replies
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    It's safe if you want to know what 65 to 75% of...

    It's safe if you want to know what 65 to 75% of RLA is...not sure what your asking...:eek:
  35. The Mitsubishi 4ton goes from 6000btu to...

    The Mitsubishi 4ton goes from 6000btu to 48000btu...so a 1/2 ton 4ton seems like pretty decent turndown...:eek:
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    It's my opinion only but it seems that the...

    It's my opinion only but it seems that the readings are marginally off but the performance is radically off...

    I checked a couple of generic fixed orifice superheat calculators that say 5 degrees...
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    Charge is correct...I would be looking at airflow...

    Charge is correct...I would be looking at airflow and capacity...that unit is doing all it's going to...:eek:
  38. Wonder how many people actually got this??? :eek:

    Wonder how many people actually got this??? :eek:
  39. Replies
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    Flow doesn't change approach like that. Heat...

    Flow doesn't change approach like that. Heat rejection changes approach. If you have high approach you have less heat transfer...

    Scale lowers delta T and raises pressures...

    Low flow raises...
  40. Replies
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    I used to be a high volume broiler cook at lone...

    I used to be a high volume broiler cook at lone star steakhouse and black angus and several other places before the hvac world...

    I get my grill super hot, turn 4 times for marks and set the...
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    Approach is the value of the insulation(piping +...

    Approach is the value of the insulation(piping + inhibitors like scale)...

    So you have refrigerant, tubing, water...On the evap side high approach means you have to lower suction temp/pressure to...
  42. Replies
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    The customer knows why you are there because they...

    The customer knows why you are there because they called you. I introduce myself ask for an explanation of what's going on give them a few possibilities based on initial information and answers to...
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    Not sure who "this guy" is, and it has nothing to...

    Not sure who "this guy" is, and it has nothing to do someone being a super tech...this is the same as calling a mechanic and saying my car doesn't work and when he's asking what's it doing saying...
  44. It seems the MSY/MSZ only goes to 4ton in single...

    It seems the MSY/MSZ only goes to 4ton in single phase :eek:
  45. I don't have 3 phase and the single phase...

    I don't have 3 phase and the single phase multi-heads stop at 5 tons as far as I know...I work for the Mitsubishi rep and am a DSG member...:eek:
  46. One board can take out the other especially the...

    One board can take out the other especially the power board. I am more scared of the DC buss then the line voltage in that case :eek:
  47. Unfortunately you aren't going to get much help...

    Unfortunately you aren't going to get much help with this problem other the the requisite call a tech...if you are a tech get this moved or start a thread in the right place and I can tell you what's...
  48. I have been wanting to do exactly what your...

    I have been wanting to do exactly what your describing for a while now...The problem is the Mitsubishi S series or PUMY units only go to 5 tons and I need 7 tons. And also the ducted air handlers are...
  49. Heat derates fuses and breakers. They trip on...

    Heat derates fuses and breakers. They trip on heat and amps cause heat...Voltage imbalance, bad contacts, loose connections cause excess heat...Ambient temps will cause issues also...You would be...
  50. If the techs are commission I would look...

    If the techs are commission I would look elsewhere...:eek:
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