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  1. Replies
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    174

    Are you sure your unit is going into defrost that...

    Are you sure your unit is going into defrost that often? Mitsubishi units have a minimum run time before going into defrost, and when they do defrost the maximum time is 10 minutes before it...
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    549

    Shut it down, this can be a safety hazard. B...

    Shut it down, this can be a safety hazard. B vent cannot terminate sidewall without an additional vent kit.
  3. Mitsubishi is OK with braze joints as long as...

    Mitsubishi is OK with braze joints as long as nitrogen is flowed during brazing, but in this case the install manual clearly states to use fitting adapters connected directly to the branch box when...
  4. Mitsubishi tech support will likely not be a...

    Mitsubishi tech support will likely not be a great deal of help on the Redlink gateway because all they're concerned about is whether the MHK1 is connected to the Mitsubishi and communicating.
    ...
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    374

    The drain pans in the MLZ cassettes are really...

    The drain pans in the MLZ cassettes are really shallow and I expect that any pitch will cause you water leaks on the downhill side. Just took a quick look at the manual and it specifically says...
  6. The Cor does do automatic updates and there isn't...

    The Cor does do automatic updates and there isn't a way to force a download. Not sure what the most current version is though.
  7. Replies
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    538

    There's no good way to put an interlock on an...

    There's no good way to put an interlock on an Infinity system because it's communicating. A creative tech could make something work, but it for sure wouldn't be factory approved. Have you...
  8. Are these wall mounted heads? If so, they don't...

    Are these wall mounted heads? If so, they don't pull air from anywhere but inside the room unless the penetrations for the refrigerant lines behind the head aren't sealed. If there are gaps behind...
  9. Are you using the power extender kit or did you...

    Are you using the power extender kit or did you already have a common wire running to the thermostat?
  10. The reason your Mitsubishi thermostat wouldn't...

    The reason your Mitsubishi thermostat wouldn't set below 67 is because the lowest setpoint that your equipment allows is 67 - min and max setpoints are set by the equipment, not the controller...
  11. The short answer is no. Your unit falls into the...

    The short answer is no. Your unit falls into the first column - MSY/MSZ A. Those older units were handheld remote only because there's no place to plug in the Kumo adapter or any other thermostat...
  12. Replies
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    416

    Per the operational performance on your...

    Per the operational performance on your configuration the indoor units get a slight derate in capacity - the GL12 derates to 11,400 BTU and the GL9 derates to 8,600 BTU. If you drop the 9K to a 6K...
  13. Replies
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    416

    Judging by your humidity levels I would say that...

    Judging by your humidity levels I would say that both units are oversized. Did anyone do a load calculation for the space? If your 450 sq ft space has a 1 ton head why would your 200 sq ft space,...
  14. It depends on the thermostat. Most dual fuel...

    It depends on the thermostat. Most dual fuel capable thermostats use outdoor temp sensors to pick when to run the furnace or the heat pump, which is the most efficient way. I know that there are...
  15. Replies
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    344

    Looking at the specs for the S2000, it's only...

    Looking at the specs for the S2000, it's only rated for up to 2400 square feet of living space and the S2020 (240V) is rated for 3200 square feet. You'll probably need to either tighten up the house...
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    241

    1996

    1996
  17. The auxiliary drain is the one that's plugged on...

    The auxiliary drain is the one that's plugged on the evaporator coil. Since you don't have a secondary drain pan it would be wise to either pipe that secondary drain to the floor drain or add a...
  18. The short answer is that the Carrier 4" media...

    The short answer is that the Carrier 4" media cabinet is an oddball size that won't take a standard 20x20x4 filter. That being said, there are options for aftermarket filters that fit the cabinet. ...
  19. Replies
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    377

    I know Mitsubishi has a conventional thermostat...

    I know Mitsubishi has a conventional thermostat interface, not so sure about the Daikin. The real question is why would you want one. Putting a standard thermostat on a mini split generally turns...
  20. The heating offset isn't changed by option 174 in...

    The heating offset isn't changed by option 174 in the thermostat, that's just the display offset if your thermostat is reading off by a degree or two. The ceiling cassettes have a built in offset...
  21. Replies
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    460

    In general, cooling fan speed is higher than...

    In general, cooling fan speed is higher than heating fan speed so you will get more air delivery. That furnace has 2 different sized blowers available, 2.5 and 3 ton, and a set of switches used to...
  22. If all of the air handlers are doing it, then...

    If all of the air handlers are doing it, then it's normal operation. If it's only one that does it there may be an issue.

    On another note, did the installing contractor advise you not to use the...
  23. Replies
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    It'll probably work as long as they're out of the...

    It'll probably work as long as they're out of the walking path of anyone over 5'6 but it could affect performance a bit. Mitsubishi makes a floor mount unit that might work better in your situation.
  24. In cooling mode the fans will continue to run at...

    In cooling mode the fans will continue to run at whatever speed is selected on the remote control even after it's satisfied - maybe try "auto" mode for the fan. In heating the fan will drop to a...
  25. What kind of thermostat are you using? If the...

    What kind of thermostat are you using? If the temperature sensing is being done at the air handler, the fan will run constantly.
  26. Since your heat sources are separate and you're...

    Since your heat sources are separate and you're using the hot water baseboard as backup it should be fine to configure them to run at the same time. You may still get some overshooting of the temps...
  27. Replies
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    398

    Not likely. There's just an unused 3rd zone on...

    Not likely. There's just an unused 3rd zone on the control board.
  28. Replies
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    398

    When the system shuts down all of the zone...

    When the system shuts down all of the zone dampers open, so when the unit is off your 3rd zone light will come on to show an open zone. The older zone panels don't know what's connected to them,...
  29. Most heat pumps in the south are sized for the...

    Most heat pumps in the south are sized for the air conditioning load, so if 3 tons is your cooling load you get a 3 ton heat pump.

    For dual fuel your heat pump lockout temp can be set by your...
  30. The short answer is no DIY advice given. ...

    The short answer is no DIY advice given.

    Having read through your post to the end I find it strange that you've paid for 3 techs to come to the house but won't just bite the bullet and replace the...
  31. Replies
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    I haven't seen an old Comfort Zone 1 system in a...

    I haven't seen an old Comfort Zone 1 system in a few years. That particular zoning system isn't compatible with standard thermostats because it uses a proprietary communication protocol. You'll...
  32. Have any of the boards been changed in either the...

    Have any of the boards been changed in either the furnace or the outdoor unit? If the answer is yes, then it is probably compatible. If the answer is no, then maybe. I also have a 2007 model...
  33. Replies
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    696

    Nest thermostats sometimes like to keep sending...

    Nest thermostats sometimes like to keep sending voltage even after they're satisfied. My old company was a Nest "Pro" contractor so I got to see this a fair amount of times. They really are junk...
  34. A quick look at the 1501 code comes up with a few...

    A quick look at the 1501 code comes up with a few different options, low charge only being one of them. I've learned that Mitsubishi descriptions can be a bit misleading sometimes and paying...
  35. The first step in getting a good contractor is...

    The first step in getting a good contractor is going to the Mitsubishi site and doing a zip code search to find a Diamond contractor. Unfortunately that doesn't mean that all of their techs are well...
  36. I guess what I'm saying is that it might not be...

    I guess what I'm saying is that it might not be the wires. It could be a piece of hardware that's the problem and running a new wire might not solve the problem. There's a very specific way to...
  37. I used to work for a Carrier dealer (same as...

    I used to work for a Carrier dealer (same as Bryant) and saw plenty of comm wires spliced over the years. There's a fairly simple test that can be done on all of the boards and the wires to see if...
  38. Condensers are installed in a closet? Are they...

    Condensers are installed in a closet? Are they the through the wall type or did someone stick 2 standard condensers in a closet on the balcony?
  39. Replies
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    520

    Are you keeping the boiler and radiators and...

    Are you keeping the boiler and radiators and looking to add air conditioning or are you replacing everything? If no contractor in your area is super comfortable with mini splits and local parts...
  40. Replies
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    The real question is which one of them measured...

    The real question is which one of them measured your house and is going to do a proper heat load calculation? If they're all just replacing like for like I'd suggest getting a quote for equipment...
  41. I can't remember the exact footage but bends do...

    I can't remember the exact footage but bends do add "x" amount of feet per bend. And by bend they mean a hard 90 degree fitting, not a sweeping bend of the soft copper. Either your contractor or...
  42. It sounds like the system may be undercharged. ...

    It sounds like the system may be undercharged. Did the installers run the system through Mitsubishi's system builder tool? This will give you the exact amount of additional refrigerant needed. The...
  43. Replies
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    680

    Just curious, why did they replace a 2 stage...

    Just curious, why did they replace a 2 stage compressor with a single stage compressor? I can't remember off the top of my head, but I think the older 2 speeds had a muffler installed. Maybe one got...
  44. Replies
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    1,426

    This! Also post the case # that Mitsubishi gave...

    This! Also post the case # that Mitsubishi gave the tech who called in and I can look it up on Monday to see what's going on. Tier 1 does not handle refrigerant issues so they would have assigned a...
  45. Replies
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    1,426

    Has any of the techs done a thorough cleaning of...

    Has any of the techs done a thorough cleaning of the blower wheels and coils in the last 10 years? The Mitsubishi blower wheels are notorious for gathering dirt and grunge and the units will perform...
  46. Replies
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    If you set it to 0 that's port 16. Backwards, I...

    If you set it to 0 that's port 16. Backwards, I know, but that's Mitsu logic. Mods, please move this to tech to tech chat.
  47. Replies
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    424

    The way I count that, 0-9 is 10 places and A-F is...

    The way I count that, 0-9 is 10 places and A-F is 6 places. And all Mitsubishi BC addresses use "1" as the lowest connected unit.
  48. Not sure about current Bryant model numbers for...

    Not sure about current Bryant model numbers for replacement, but what you have is a communicating system that uses a proprietary thermostat (Evolution control) that will perform dual fuel operations...
  49. Replies
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    1,426

    Mitsubishi tier 2 tech support will absolutely...

    Mitsubishi tier 2 tech support will absolutely not talk to homeowners when there is a cooling issue, you may have limited luck with the tier 1 support. If you're running a multi port unit (1 outdoor...
  50. That furnace came with a removable plate which...

    That furnace came with a removable plate which isn't very air tight. Your contractor should be able to seal it better than factory with metal and duct sealer. Depending on the size of the furnace...
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