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    Yup. And best of all, he had no problem with me...

    Yup. And best of all, he had no problem with me watching over his shoulder and asking questions, chatting, etc. Can't say I've ever had a problem with a contractor or inspector that's been open about...
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    Yup, that's pretty much what he said. Think it...

    Yup, that's pretty much what he said. Think it was 48F or so out when he checked, and again, it was in heat mode. Everything seemed perfectly fine to him, and he lamented the fact he's been telling...
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    I have a 2.5ton, so reciprocating. Got it. ...

    I have a 2.5ton, so reciprocating. Got it.

    Thanks!

    Ryan, does his explanation seem reasonable?
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    on a side note, does the XL15i have a recip or...

    on a side note, does the XL15i have a recip or scroll compressor? just curious.
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    And the winner is: catmanacman There's nothing...

    And the winner is: catmanacman

    There's nothing wrong. According to the tech, subcool really only matters (in heat mode) if it were REALLY high or low. He just measured, and it was about 20. Can't...
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    yeah, got that. so the general consensus seems...

    yeah, got that. so the general consensus seems to be there shouldn't be two filter driers....
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    Not terribly comfortable with posting serial...

    Not terribly comfortable with posting serial numbers on a forum. The unit was purchased in 07, so it's still under warranty for parts then. Was there any known issues with the txv around that time?
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    k. I shall report back... anyone else with input,...

    k. I shall report back... anyone else with input, please please! Also, just went out and checked, and indeed, there are two filter driers (one on the LL as it heads to the house, and one inside the...
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    duplicate of below.

    duplicate of below.
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    okay, I'll ask about just not having it, or...

    okay, I'll ask about just not having it, or removing it. I'm guessing they put them on all the systems as part of their standard install... but who knows.

    So, how do they test for a clog, per se?...
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    Well, no idea how long it's been like this is the...

    Well, no idea how long it's been like this is the thing, other than it could have been 14 months (time between checkups). But yeah, guess a couple more days isn't really that much comparatively....
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    the system still works fine, and I was told it...

    the system still works fine, and I was told it wasn't a problem to keep using it, it's just a bit less efficient. is it a problem running it with a high subcool?

    I'll have to ask about the extra...
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    I understand, it was an example... but thanks....

    I understand, it was an example... but thanks. sorry about that.
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    Pretty sure, yes. It's on the liquid side I...

    Pretty sure, yes. It's on the liquid side I believe (the smaller, non-insulated copper tubing) just after the tubing "leaves" the HP and heads up into the house. Looks like this:...
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    Really, all of this is going off the yearly...

    Really, all of this is going off the yearly maintenance guy, where an actual repair tech/diagnosis is going to happen monday, but I don't want to just be told "yup, clogged drier, it'll be $$$" if...
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    yup, R410A. Heatpump: 4TWX5030A1000AA AH:...

    yup, R410A.

    Heatpump: 4TWX5030A1000AA
    AH: 4TEE3F39A1000AA

    And no, I don't think so. He had cleaned the coils prior. I know that's mentioned in various places, but I'm not sure how you measure...
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    Sanity check on maintenance

    All,

    I just had a yearly "checkup" on my heatpump (Trane XL15i), and they said the subcool was high (28), which does seem high (here are all the "deets")

    OD Temp: 42
    ID Temp: 69
    SL Temp: 40...
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    Thanks Mark! So, I'm curious, how does the Nest...

    Thanks Mark! So, I'm curious, how does the Nest know when to use emergency/secondary heat if it doesn't work with an outdoor temp probe?

    But heck, you answered a follow up question as well, which...
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    that wasn't snarky or anything. =P By "worth...

    that wasn't snarky or anything. =P

    By "worth it", I guess I meant, would I lose some key function of the IAQ? I didn't mean, "Would this pay for itself". I'm a geek, it doesn't need to if it's...
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    Upgrade from Honeywell IAQ 9000 to Nest

    So, subject says the gist. I'm curious if this is even a feasible upgrade, and whether or not it would even be worth it.

    Has anyone seen a system go this way? I bought the IAQ largely because it...
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    they did a load calc when they installed the...

    they did a load calc when they installed the system... though, I don't recall any of the info... I think they gave me the info, but again, not sure.

    Can you point me in the right direction and if...
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    okay. Figured there was a calculation for the...

    okay. Figured there was a calculation for the balance point, but it sounds like it's fairly experimental.

    I'll have to wait until next winter to actually figure it out (it's not getting really...
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    btw, it's a 2.5ton unit. so, by your...

    btw, it's a 2.5ton unit.

    so, by your reasoning, should I lower the lockout on the aux heat then? it's currently 35F, which is the "requirement" by one of the local energy companies.

    Thanks!
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    okay. Good to know. I'll kill the compressor...

    okay. Good to know. I'll kill the compressor lockout.

    Thanks!
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    really?! Yeah, the coldest we have here is...

    really?! Yeah, the coldest we have here is occasionally we get single digits (F). But much below freezing it seems like the HP runs non-stop where I figure running the Aux heat for a few minutes...
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