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  1. Thread: GFCI on CUs

    by FlyersFan
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    14
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    318

    I know that GFCI breakers don't play well with...

    I know that GFCI breakers don't play well with inverters. Mitsubishi and the other mini split manufacturers were involved in the petition to delay the GFCI for outdoor units code. Systems wouldn't...
  2. 3 to 4 tons seems like a lot of cooling for 1500...

    3 to 4 tons seems like a lot of cooling for 1500 square feet! Definitely have someone do a load calculation to determine what size you really need or it's going to turn into an expensive,...
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    466

    From the OP's original post I was under the...

    From the OP's original post I was under the impression that it's a 2 story condo and not 2 condos. I may have read it wrong though.
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    418

    I'm going with not normal. Basic sequence of...

    I'm going with not normal. Basic sequence of heat startup: Draft induce starts, pressure switch closes, igniter gets hot, gas valve opens, flame gets proved.

    Multi speed inducers may ramp up to...
  5. Replies
    18
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    466

    More than likely it was originally a system like...

    More than likely it was originally a system like I described, Lennox just happened to be the most popular around here. That being said, what you currently have is a mess, and you're probably about...
  6. Replies
    18
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    466

    Lennox used to make a system like that. 2 stage...

    Lennox used to make a system like that. 2 stage outdoor unit, zone board, and 2 indoor coils/air handlers. Got a model # of the outdoor unit?
  7. Auto mode will work if you add the kumo cloud...

    Auto mode will work if you add the kumo cloud adapters. If one unit is calling for cooling while the others are calling for heating kumo will put that unit in standby and allow the heating calls to...
  8. Replies
    11
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    469

    The units you have are solid, well performing...

    The units you have are solid, well performing units. The real question is whether to spend $XX to fix what you have and stay with the no warranty on parts, 7 year compressor warranty or just blow it...
  9. Replies
    11
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    469

    Unfortunately the City Multi warranty...

    Unfortunately the City Multi warranty registration is different from the residential warranty registration which only requires filling out model, serial and date of installation. For the CM units...
  10. Replies
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    370

    I guess those folks have never stayed anywhere...

    I guess those folks have never stayed anywhere that has door sensors and motion sensors to set back the AC if a door is open or no one is in the room. The people sound like a pack of tools that are...
  11. I would absolutely use zoning if the room by room...

    I would absolutely use zoning if the room by room load calcs show that there isn't a small enough head to handle the load in the room without being oversized. It just needs to be sized right and the...
  12. People zone Mitsubishi ducted systems all the...

    People zone Mitsubishi ducted systems all the time. While it's ideal to have separate indoor units for each zone it's not always feasible because the heat loss/gain of some spaces is too small for...
  13. Replies
    2
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    274

    I don't know of a thermostat that has a minimum...

    I don't know of a thermostat that has a minimum heat setting, just a max heat and minimum cooling temperatures. Someone out there may make one. What kind of heating and cooling system do you have...
  14. Replies
    3
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    648

    If you're connecting to a one to one or a ported...

    If you're connecting to a one to one or a ported unit you'll need the cable kit. Units with a branch box use the MN converter PAC-USCMS-MN-1 instead of the cables. I can tell you that you'll get...
  15. Your profile says you're a tech, but you're...

    Your profile says you're a tech, but you're posting in the homeowner's section so we can't get more specific on the wiring unfortunately. If you are a tech please apply for pro status so I can get...
  16. Blue Diamond pumps will create communication...

    Blue Diamond pumps will create communication errors if wired to break S1 on a branch box system. Follow the Mitsubishi app note.
  17. In the device setup the MHK1 needs to be set up...

    In the device setup the MHK1 needs to be set up for residential (setup 136) and non-programmable (setup 138) and all timers need to be disabled. Can't remember those off the top of my head but I...
  18. PAC-US444 will not work with the kumo cloud...

    PAC-US444 will not work with the kumo cloud adapter. The only controller that can plug into that second port on the adapter is the MHK1 or MHK2.
  19. Unfortunately the answer is no unless someone...

    Unfortunately the answer is no unless someone changed the fan speed dips in the PAC-US444. The default fan speed for heating and cooling is auto but I believe that the default fan speed with just a...
  20. He's probably talking about Nylog instead of...

    He's probably talking about Nylog instead of nylon. Not really necessary if you use oil on the flares.
  21. For the gap around the lineset I'm also going...

    For the gap around the lineset I'm also going with installer issue. From page 10 of the installation manual:
    Refrigerant pipes are protectively wrapped
    • The pipes can be protectively wrapped up...
  22. Replies
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    568

    Ever since UEI hosed the fine folks at Digi-Cool...

    Ever since UEI hosed the fine folks at Digi-Cool I vowed to never buy their stuff again. I am a bit of a grudge holder :whistle:
  23. Have you considered doing a hybrid approach? ...

    Have you considered doing a hybrid approach? Replace the 75 gallon domestic water heater with 2 40 gallon heaters, one heat pump and one LP, piped in series with the heat pump water heater being...
  24. Replies
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    1,225

    HVAC-talk helped me in my early days. Been a...

    HVAC-talk helped me in my early days. Been a member since the site was privately owned and there was no such thing as a pro membership (my original account got hosed and had to start over in 2010). ...
  25. Double post

    Double post
  26. Gotcha. I do like those. And there's a smaller...

    Gotcha. I do like those. And there's a smaller 6K model coming out this year.
  27. Looking at the various manufacturers out there I...

    Looking at the various manufacturers out there I don't see any 4 headed outdoor units that are smaller than 3 tons and the 3 headed outdoor units start at 2 tons. If you're looking at 7 or 8...
  28. Replies
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    422

    If you're going to DIY a bigger name brand like...

    If you're going to DIY a bigger name brand like Mitsubishi just know that most local supply houses won't swap parts for warranty if the unit was bought online. You'll have to go to the online...
  29. I personally love mini splits in certain...

    I personally love mini splits in certain applications so I'm not trying to talk you out of anything.

    Ducted mini splits are becoming more common, but one question is going to be about the assumed...
  30. This is straight out of the engineering manual: ...

    This is straight out of the engineering manual:

    4. Low outside temperature operation:
    If the outside temperature falls to 64°F (18°C) or less during operation in COOL
    mode, the unit will switch...
  31. Replies
    1
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    271

    Did the tech determine why the damper isn't...

    Did the tech determine why the damper isn't opening all the way? Some dampers have a minimum/maximum damper position that can be set so it may be running up against a stop. What kind of damper...
  32. This is absolutely normal Mitsubishi behavior if...

    This is absolutely normal Mitsubishi behavior if the unit is in cooling mode (it doesn't have to be calling for cooling, just in cool mode) and the outdoor temp is below 63°. It'll run the outdoor...
  33. Replies
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    520

    Ideally it's better to put it on the short wall...

    Ideally it's better to put it on the short wall and blow the length of the space instead of the other way around, and I would mount it at normal 8' ceiling height if that's an option. Too high up...
  34. Replies
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    837027 There's my pet peeve of the day. Just...

    837027

    There's my pet peeve of the day. Just glue a damn union in there for drain service instead of leaving a potential leak point.
  35. That unit doesn't seem to have any sort of...

    That unit doesn't seem to have any sort of absence detection or energy saving feature. Are you running a timer by chance? If the timer is activated the highlighted part of the picture will be on the...
  36. Replies
    5
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    688

    BBeerme's story reminds me of a time that a...

    BBeerme's story reminds me of a time that a coworker called and said the scroll compressor on a 3 phase package unit sounded terrible and wasn't pumping. I told him to swap L1 and L2 because it was...
  37. You aren't kidding about that. A couple of weeks...

    You aren't kidding about that. A couple of weeks ago I was at the Crazy Horse Memorial while on vacation and spent a ton of time in the museum there. The museum focuses more on the culture of the...
  38. It's days like this that I'm a little glad I...

    It's days like this that I'm a little glad I don't do field work anymore, but I still sat here for a minute thinking about buying one. I guess it could keep all my other tools in the garage company....
  39. Replies
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    436

    First I'd get a second opinion on that stuck...

    First I'd get a second opinion on that stuck reversing valve. It's entirely possible that one bank of the electric backup heater is stuck on, affecting your cooling and driving up your power bill....
  40. Replies
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    281

    Most people around here just run it in 3/8" vinyl...

    Most people around here just run it in 3/8" vinyl tubing and replace the tubing when it gets eaten up by the UV light. Or they don't and it just looks like crappy cracked vinyl. I prefer using 1/2"...
  41. One of the last of the Navajo code talkers has passed

    Samuel Sandoval, one of the last remaining Navajo Code Talkers, has died at age 98

    I had the pleasure of meeting this man in the late 80s because I was dating his daughter. At the time she and I...
  42. Replies
    5
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    390

    Looks like that furnace has a separate fan only...

    Looks like that furnace has a separate fan only speed that would also be used as a first stage cooling fan speed if you had a 2 stage condenser. Depending on the size of the AC your tech might be...
  43. Replies
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    565

    Mini splits are taking off in areas where they're...

    Mini splits are taking off in areas where they're starting to ban natural gas and oil in new construction and where they want people to rely more on heat pumps than oil. Mostly the New England area...
  44. Replies
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    565

    If it's a multi story home then 2 condensers for...

    If it's a multi story home then 2 condensers for sure. As said before, with 2 condensers when one goes down you'll still have some heating and cooling it part of the house.

    Check with your...
  45. You may it out of luck on this one. The new...

    You may it out of luck on this one. The new controllers won't work with the old R22 equipment so you'd have to find one on ebay if you're lucky. That sucker's so old they had to scan the manual in...
  46. Replies
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    415

    It looks like they're just guessing at sizes...

    It looks like they're just guessing at sizes really. If they're looking to replace the existing electric heat then the sizing will need to be done for the heating load of the space instead of the...
  47. Replies
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    219

    Will it work with a newer model indoor unit?...

    Will it work with a newer model indoor unit? Maybe. The communication protocol is the same.

    Will it work well? Unlikely

    That outdoor unit is 14 years old and parts are being discontinued so it...
  48. Unfortunately your father is right about part of...

    Unfortunately your father is right about part of it - gas furnaces are replaced instead of being repaired. With the exceptions of a few parts already listed (variable speed inducers, ECM motors,heat...
  49. I'd also write it into future leases that if...

    I'd also write it into future leases that if there is a problem with the AC due to tenant negligence the amount of the repair will be added to the following month's rent.
  50. If the zones are small then you can get alerts on...

    If the zones are small then you can get alerts on the Infinity interface, usually "static pressure stagedown" events because the zones are too small to move the minimum amount of air required for...
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