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Type: Posts; User: hobbit

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  1. Replies
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    quick-connect on Friedrich

    I just became aware of the Friedrich "Breeze" systems geared toward
    the DIY market, which evidently come with a pre-charged lineset
    and this wacky both-at-once quick connector with a big locking...
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    Am I allowed to ask this here? It's for another...

    Am I allowed to ask this here? It's for another "theory"
    clarification ... the various mentions that subcooling on
    the indoor coil in heating mode would generally be greater
    than [presumably...
  3. Thread: clearing a leak

    by hobbit
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    I think it's the drain because I saw a quick...

    I think it's the drain because I saw a quick video the owner
    had shot, showing the typical white PVC with a U-trap coming
    out of the unit and heading away and water dripping out of
    the box about...
  4. Thread: clearing a leak

    by hobbit
    Replies
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    521

    clearing a leak

    Hopefully this doesn't tread too close to DIY but I've got some
    friends who are in a pickle this warm Sunday evening and can't
    get anybody in until tomorrow. They've got an a/c unit in the
    attic...
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    Thanks for the responses so far! The end goal,...

    Thanks for the responses so far! The end goal, really, is simply
    determining whether to run my HP system on high fan or low fan
    in heating mode, and have broader perspective on the advantages
    or...
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    Heating airflow theory Q

    In the tradition of my little headscratchers which are either
    thought-provoking or totally stupid, I'm not sure which, here's
    another theory question. This would be a purely heating scenario,...
  7. Thread: Wet duct

    by hobbit
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    429

    Wet duct

    Hopefully this doesn't tread too far toward DIY territory, but
    I've got a little problem with a cold-air intake that someone
    might have some insight into. You guys must deal with
    fresh-air inlet...
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    beenthere, that's awesome; a quick look at a...

    beenthere, that's awesome; a quick look at a psych chart makes
    it make sense, except that the chart I usually use only goes
    down to 20F. Still, clearly not a whole lot of grains to be
    had in air...
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    2,482

    I'm aware of how the indoor and outdoor coils...

    I'm aware of how the indoor and outdoor coils have to swap functions,
    and even know exactly where my reversing valve is... what I'm trying to
    understand is what happens to subfreezing *air* when it...
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    cold weather operation

    I've got a couple of general questions about heat-pump operation
    in cold ambients. One practical, one more theory.

    Most units either have a crankcase heater or use the inverter to
    bleed about...
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    heat pump fan high or low?

    Swinging into heating season here, I'm wondering if it's better
    to run a heat pump's AHU blower at a higher or lower speed?
    While lower is better for summer dehumidification, if we're only...
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    Trust me, the second company will be who gets...

    Trust me, the second company will be who gets called next [unless
    I have an actual warranty issue] but really, with periodic simple
    care/cleaning that I can do myself I'm hoping to not have to call...
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    2,322

    I don't know if it's better to follow up on a...

    I don't know if it's better to follow up on a really old thread
    or start a new one; I'll try it this way first.

    I finally had another service company come out and eyeball my
    Daikin setup and...
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    Yup, the Daikin FTQ type air handler. Quoting...

    Yup, the Daikin FTQ type air handler. Quoting from the
    install manual description for option block terminals 9,10:
    "Receives input: Forced closure of indoor unit Electronic
    Expansion Valve during...
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    697

    EXV forced closure?

    I recently noticed that my air handler / indoor coil has a pair
    of dry-contact input terminals to force its EXV to CLOSED during
    cooling mode.

    When/why would you want to do this, and/or why...
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    Daikin: no emergency operation??

    I've run into what might be the first notable downside of a two-wire
    digital 'stat interface, as opposed to the typical W1/W2/Y/G/etc bundle
    of wires between a typical stat and an indoor unit. ...
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    That would all likely be true *IF* this rig had a...

    That would all likely be true *IF* this rig had a traditional stat.
    It doesn't. Daikin's big thing WRT control is two-wire data
    links -- one two-wire shot to the stat, and another one from the...
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    It finally got warm enough again that I was able...

    It finally got warm enough again that I was able to get the coil loaded
    up and try to take a CFM measurement. The filter slot opening is
    about the same dimension as the main return duct, so I pull...
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    I did have that thought ... except that OAT can't...

    I did have that thought ... except that OAT can't be measured if the
    outdoor unit doesn't have power anyway. The scenario I'm thinking
    is indoor AHU powered, outdoor unit dead ... I should still...
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    when does emergency/backup heat kick in

    This is kind of a general question and the specifics for particular
    brands/units might be all over the place. I'm in New England, where
    we have ice storms and weird "snowpocalypse" events and...
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    2,375

    That's about what I was thinking, re: COP. The...

    That's about what I was thinking, re: COP. The outdoor unit was
    drawing all of 3 or 4 amps at 240V, less than a kilowatt for several
    hours. This particular experiment went on fairly far into the...
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    another silly psych question

    No, this isn't about my "macguyvered" windowshaker-turned-dehum; that's
    been put away for the moment because the real system is doing so much
    better at water removal. So I've been studying that a...
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    Sorry, it probably came out a little wrong as can...

    Sorry, it probably came out a little wrong as can often happen in
    email. And yes, the spam-filters are pretty strict over here, but
    the rejection should have indicated something about why it...
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    Hmm. That's one of the issues, finding someone...

    Hmm. That's one of the issues, finding someone who is willing to
    do all that due diligence. The guy who installed this rig for me
    apparently isn't.

    It probably seems like I'm going too hard on...
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    2,513

    Okay, good to know about the PVE -- the Daikin...

    Okay, good to know about the PVE -- the Daikin doc never mentions
    anything about oil type one way or the other, and I just assumed it was
    POE. Having studied automotive coolant and brake-fluid...
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    inverter unit pumpdown

    In the process of fixing my flare leak (see the end of
    my other thread ) my tech did something I thought was
    ... not necessarily impossible, but made somewhat difficult
    on the newer systems. He...
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    Oh, and now the bad news. I just observed that...

    Oh, and now the bad news. I just observed that the lineset
    is leaking, right at the vapor-line flare nut.

    Argh.

    My guy is back here tomorrow anyway, and I guess he's
    going to have a bit...
  28. Replies
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    Sorry, was away over a long weekend... Outdoor...

    Sorry, was away over a long weekend...

    Outdoor unit is RZQ18PVJU9 inverter type,
    indoor is FTQ18PAVJU upright ducted air handler,
    remote-controller is BRC1E71 "Navigation" panel.
    AHU will have...
  29. Replies
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    Is it effective to throw in questions on a...

    Is it effective to throw in questions on a slightly different issue
    onto an older thread? After playing with the system for a few
    days now, I've found that the blower *always* runs when the...
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    I looked at bpi.org and it came up with a list of...

    I looked at bpi.org and it came up with a list of contractors
    in my area which *all* say yes, they're certified for all possible
    aspects, building-analysis, manufactured housing, heat/hvac ...
    I'm...
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    Unfortunately, the guy *is* the owner ... who...

    Unfortunately, the guy *is* the owner ... who offered the usual
    sort of "been doin' this for a lotta years, it's fine" excuse. Yes, I
    *did* ask before he started -- not really insistently, since...
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    careless commissioning?

    Hi, back again with more on the Daikin install. This, by the
    way, as kind of a sideways comment on the "inverter" thread,
    is a 1.5 ton inverter-driven system with an upright air-handler
    designed...
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    Nope, this is a fully *ducted* system with an...

    Nope, this is a fully *ducted* system with an upright AHU, and
    while return-air sensing is an *option* the default place is in
    the wall-mounted controller instead. So the stat is reading
    right...
  34. Replies
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    Daikin t-stat heats itself

    My Daikin ducted split system is finally being installed, and
    I noticed that the t-stat aka "remote controller" seems to be
    reading a higher room temp than it actually is by close to
    5 F. It's...
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    By *un*bending the condenser fan blades a little...

    By *un*bending the condenser fan blades a little bit, I got the
    airflow up to more like 160 CFM. At the volume in question,
    that's a theoretical air change in a little over half an hour.

    The...
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    Yeah, where the moisture is going is what I can't...

    Yeah, where the moisture is going is what I can't figure out. DLZ --
    yes, actually, absolute moisture content seems to have pretty much
    stayed the same, maybe increased very slightly -- but at the...
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    a little psych problem

    I'm doing some dehumidification in a basement, whose air volume
    I've figured at about 4540 cubic feet. I'm near sea level, so
    I ballpark that as about 344 pounds of dry air. Temp started
    at...
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    I can control quite a few of the variables to a...

    I can control quite a few of the variables to a large degree as
    a single occupant -- cooking, showers, plug loads, etc, and take
    outdoor vs. indoor temps into account during data collection.
    It's...
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    heat loss in real life

    Hopefully this isn't too confusing a question. I'm interested
    in measuring heat loss of an existing building, for its own sake
    or comparison to a man J calculation. This is relatively easy
    to do...
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    Well, I've done a little more reading, including...

    Well, I've done a little more reading, including an interesting
    DOE paper comparing a SEER-13 fixed-output system vs. a SEER-21
    variable speed one. Variable capacity with all the electronic...
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    I suppose that with enough tin work, one of the...

    I suppose that with enough tin work, one of the "concealed"
    ducted units could be swung from the joists and adapted to the
    existing system, but that doesn't seem like the right answer.
    Might also...
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    very small DUCTED systems

    Just signed up, mostly with the idea of receiving some guidance
    from the fine folks here. I've been poking around on the site
    quite a bit before registering, and the info here even in the
    non-pro...
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