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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...

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,...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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. ...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...