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  1. Replies
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    Thanks--I was assuming that it would be...

    Thanks--I was assuming that it would be proportional--0 subcooling is totally empty, so 20/15 would be overcharged by 33.3%. Glad to see I'm wrong.
  2. This is the Ask Our Pro's forum, and only Pro...

    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary, or ask questions of the OP here.

    You can find the rules for posting and...
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    Consequences of overcharging?

    I just had a tech out for a routine service on a 4 ton Carrier Infinity heat pump. Nobody has looked at the unit for a couple years, and it has been running fine. He noted that the system had been...
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    Vacation house heat pump in Virginia

    I'm about to build a vacation home on a lake in Virginia. (Design conditions 17 F winter, 92 summer.) We'll use it most summer weekends, some spring and fall weekends, and probably once a month in...
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    Here's the spreadsheet I use. The furnace...

    Here's the spreadsheet I use. The furnace calculations work for anyone, but the heat pump calculations are specific to my coil/outdoor unit combo.
    ...
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    Dual-fuel break even point

    I built a new house 5 years ago with two dual-fuel systems with a 95% efficient furnace for the lower level and an 80% for the upper level. The heat pumps are both 19 SEER. At the time, I made a...
  7. The central area of the attic is finished. The...

    The central area of the attic is finished. The finished area is surrounded by fiberglass batts on the sides and top, and the floor between the unfinished part and the second story is blown...
  8. The system wasn't used during construction--we...

    The system wasn't used during construction--we waited forever to get the electrical installed. I don't think it was turned on until about two weeks before we moved in--long after the drywall dust...
  9. I saw that registration is currently required to...

    I saw that registration is currently required to get the 10 year warranty, but the paperwork I have says nothing about that. It says 5 years for most coils, and 10 years for the tin plated models,...
  10. 0408X35219 Maybe I should also point out that...

    0408X35219

    Maybe I should also point out that this unit is in unconditioned space in the attic. The unit for the 1st level/basement is in the conditioned basement.
  11. Carrier Infinity coil failure after five years

    I have a house in Virginia with two Carrier Infinity units, one for the basement/1st floor, and another for the 2nd floor/finished attic.

    The upper unit stopped cooling last week. It had been off...
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    The ERV is "installed." It comes up on the list...

    The ERV is "installed." It comes up on the list of installed equipment. It comes on in Checkout mode in the service menu. But it never comes on otherwise, and there are no menu options to tell it...
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    Carrier Infinity Control of ERV

    I just had a new house built, and am quite thankful for all the great advice I've obtained here over the years--both by lurking, and by a handful of questions. The builder's HVAC sub has installed...
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    Flush-mount wood registers in hardwood floor

    What does everyone think of installing a flush wood register that is installed at the time a hardwood floor is installed? Is the airflow adequate? I'm about to build a house and am considering...
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    Arrrggh

    Now I'm getting more and more frustrated. I did a Manual J with HVAC-Calc and double and triple checked. The heat pump models I'd like to install will satisfy my Manual J, and I even changed the...
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    A couple points: I'd never consider installing...

    A couple points: I'd never consider installing such an oversized furnace it it was not just the backup for the heat pump, but if it's only coming on when the temperature is ~30 degrees, the low...
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    The HVAC contractor has done a Manual J using the...

    The HVAC contractor has done a Manual J using the 8th edition and comes back with higher numbers than I've got and won't do a 3 ton, and say that the local permit authority wouldn't allow a 3 ton. ...
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    Carrier Infinity heat pump/furnace sizing

    Iím building a new house in Northern Virginia and am right below the dividing line between a 3 and 4 ton heat pump for the second floor/attic in a two-unit system. I would be comfortable going...
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    Thanks for all of the helpful comments. On other...

    Thanks for all of the helpful comments. On other issues, the builder's credit has been quite reasonable (I'm as much a stickler for windows and kitchen cabinets as I am for HVAC).
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    I thought the Infinity didn't use bypass dampers....

    I thought the Infinity didn't use bypass dampers. Do you mean the humidifier ducting?
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    Guidance on specs for Carrier Infinity bidding

    I'm building a new house and am not happy with the default system that the builder installs, nor with his contractor's pricing and expertise with Carrier Infinity systems. Accordingly, we're putting...
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    ERV or HRV in Northern Virginia

    I relied on advice from this forum several years ago when replacing my furnace/AC in a 60-year-old house with a Carrier Infinity system.

    I'm about to build a new home in Northern Virginia. I've...
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    As I talked about in my previous post, I'm having...

    As I talked about in my previous post, I'm having my house zoned into three zones with my one-year old Carrier Infinity system. Due to the layout of the ducts (an old house was added on to), I'll...
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    There are two trunk lines. There are also two...

    There are two trunk lines. There are also two small branch lines that extend directly from the supply plenum (is that the correct word?) just above the A/C coil.

    The first trunk line serves the...
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    I live in a two-story colonial in Virginia built...

    I live in a two-story colonial in Virginia built in 1947 that has a two-story addition on the back that was added in 1984. Last year, I had a Carrier Infinity system installed (3 ton A/C, 60k btu...
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