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  1. Replies
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    shophound> They may be thermally happy, but are...

    shophound> They may be thermally happy, but are they pleased with their utility bill?

    FPL (the local utility) monthly bill average for 6 months prior to installing the new ductless heatpumps,...
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    cost came in a half price vs. comparable whole...

    cost came in a half price vs. comparable whole house dehu. installation was a snap compared to installing the dehu.
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    an alternative to whole house dehumidifier

    recently a couple building two new houses asked me for an alternative to whole house dehumidifier or running room dehumidifiers. this is in s.florida where we've had unseasonably cool couple weeks,...
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    > it's a 4 ton, 2.5 year old Trane, the house is...

    > it's a 4 ton, 2.5 year old Trane, the house is approx. 2600 sq ft

    it's *WAY* oversized, guess you did not comprehend my reply as I live in your vicinity under similar temperature and humidity...
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    since I also live in s.florida, it's unusual to...

    since I also live in s.florida, it's unusual to read someone keeping the tstat at 75F and can only assume you have no control over your indoor humidity (RH%) and that your system does not have...
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    Carbon Dioxide R744 system

    have a chance to see my first R744 system installation this weekend, plan on installing several depending on how this 1st setup goes
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    bobRichie: >that recent digital thermostats have...

    bobRichie:
    >that recent digital thermostats have been programmed to
    >delibrately lie to us!

    do you have the ability to adjust the display accuracy, up or down? I've done this to all installed...
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    They all use an electric expansion valve, which...

    They all use an electric expansion valve, which is located in the outdoor unit.
    It is controlled by the outdoor circuit board.

    The true liquid line is not accessible unless you take the entire...
  9. my comment relates to mitsubishi and fujitsu (but...

    my comment relates to mitsubishi and fujitsu (but likely same end result) systems.

    pressure test appears to have less value than pumping system down, verifying 400-500 microns holds without leaks...
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    on the mitsubishi and fujitsu units I've usually...

    on the mitsubishi and fujitsu units I've usually pumped system down, verified 400-500 micron (no leaks), weighed back in the factory charge +2 ounces. be careful to make allowance for suction line...
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    Climatouch makes a tstat that responds to a 2%...

    Climatouch makes a tstat that responds to a 2% change in RH.

    Example:
    RH setpoint 50%, the 24vac DH relay opens at 52% and remains open until RH is 48%, total deadband range 4%.

    No other...
  12. zero control of temperature in Mitsubishi Dry Mode

    ok, finalized yet another mitsubishi installation and (of course) the very 1st thing the customer proceeds to run is dry mode operation (very humid environment)

    it looks as if the unit simply...
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    it really would help if *only* the indoor unit...

    it really would help if *only* the indoor unit would turn off fan when cycle is complete, ie. *not* running in "fan always on" mode
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    > Is the air coming out of the inverters always...

    > Is the air coming out of the inverters always cold?

    no as the inverter controlled compressor comes on at very low revolutions based on feedback from the indoor control board, satisfies setpoint...
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    this happens universally on all my recent...

    this happens universally on all my recent installations, even using just 9000 BTU full inverter models, all using the lowest fan speed setting (also tested on Auto)

    the compressor barely comes on...
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    just verified with two other Fujitsu...

    just verified with two other Fujitsu installations, that this condition appears universal with minisplits.

    there must be some moisture taken back, copiously, from the wet evap coil with perpetual...
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    Ductless minisplit = Increased humidity

    Subject line is really a question, as I've received a number of inquiries about the constant circulation of the indoor unit (it runs perpetually, even when setpoint temperature is reached) while in...
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    after watching the operation at an installation,...

    after watching the operation at an installation, what is the reason the mitsubishi turns on the "Powerful" mode LED while running a DRY mode operation?

    The first LED signals "Power is ON", the...
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    sdgrease, now that you've made the decision,...

    sdgrease,

    now that you've made the decision, allow me to tell you my experience.

    I live about 4 hours south of you, essentially same climate but perhaps a bit more humid on the coast and...
  20. intelligent/adaptive coil material application

    regenerative latent heat pump, up to 40 seer
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    Luis-Pasco wrote: >My house is 2200 sq feet 2...

    Luis-Pasco wrote:
    >My house is 2200 sq feet 2 story

    I cool and heat 2400sq ft further south of you in FL, using just 2 tons 99% of the time. Only when OD>90F does my system occasionally run using...
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    how does Dry mode in Mitsubishi HP ?

    am installing two more mitsubishi ductless systems this week and one client asked (after reading the manual), how does Dry mode work?

    I took a look at installation manual and then the end user...
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    regis101 wrote: >Any jobs over there? am...

    regis101 wrote:
    >Any jobs over there?

    am looking for a pool boy, must have the body of David Beckham
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    regis101 wrote: >... a 1200 sq ft home at 100K...

    regis101 wrote:
    >... a 1200 sq ft home at 100K and 3 ton.

    yup, just for a quick comparison, I cool/heat a 2300sq ft house with just a 2ton compressor while I do have a dual compressor system and...
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    hvac_superman wrote: >.. and replaced it with a...

    hvac_superman wrote:
    >.. and replaced it with a Supco cap tube type dryer

    one one hand you wrote not to use and then you tell us you installed another type anyway?

    liquid line is of course...
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