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Old 04-24-2009, 08:32 AM
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Riick Riick is offline
 
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Default Dual A/C compressors ?

I've been in two recently built (large - over 3,500 sq.ft.) homes in the last two weeks
- both for REO purposes - no owners there.
Both homes had 2 A/C compressors in the rear, but only one furnace/air handler in basement.
I also noted that one of the compressors was substantially smaller than the other - lower BTU rating?
Neither home had a 2nd air handler evident on upper floor
(( Did not investigate attic through scuttle: non-FHA appraisals)).

I would ordinarily think that they had split-system heating & A/C,
but, again, no 2nd system evident.

Something new? ... What is the story here: ??

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Old 04-24-2009, 08:37 AM
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Almost all 2 story homes should have 2 condensers, and 2 interior coils. The upstairs fan/coil unit is almost always in the attic, that's why the registers on the 2nd floor are typically on the ceiling.
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Old 04-24-2009, 08:40 AM
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Look in the attic. I bet if you look over the upper level windows, you will also see a condensation drain tube over one of them. That is from the upper level unit and is an overflow tube which, when dripping water, would indicate the primary drainline is clogged and needs service.

Re: the smaller unit. I bet the house also has gas or propane heat for the lower level. If so, the smaller exterior unit you observed is just a compressor for the lower level A/C, while the larger unit is part of a heat pump system serving the upper level.
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Old 04-24-2009, 10:12 AM
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I'm with these guys.

I'm having a similar system, to what Ken described, installed at my house over the summer.
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Old 04-24-2009, 10:22 AM
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Quote:
Originally Posted by Ken B View Post
Look in the attic. I bet if you look over the upper level windows, you will also see a condensation drain tube over one of them. That is from the upper level unit and is an overflow tube which, when dripping water, would indicate the primary drainline is clogged and needs service.

Re: the smaller unit. I bet the house also has gas or propane heat for the lower level. If so, the smaller exterior unit you observed is just a compressor for the lower level A/C, while the larger unit is part of a heat pump system serving the upper level.
Or the smaller unit is the upstairs Heat Pump, since the heat load in the winter upstairs is so much lower.
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Old 04-24-2009, 10:51 AM
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Depends entirely upon the seasonal temperature characteristics of the locale. One could look at it differently and say that the cooling load in the summer for the upper level is much higher and thus the need for the larger unit for the upstairs.

But I's jus a prazur, nahn injuneer...so's take eh fo wha'z wurt.
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Old 04-24-2009, 10:54 AM
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Prolly so, and assuming that the upstairs and downstairs are the same size etc. BTW, wonder what genius decided that that was the optimum location for the dryer vent?
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Old 04-24-2009, 10:58 AM
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Hey, it increases the ambient air temp in the area of the heat pumps and allows them to be more efficient during the winter. Purty smart move, ifns ak me.
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Old 04-24-2009, 11:01 AM
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What about the summer time? Oh yeah and that neat lint covering on the coils really helps too.
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Old 04-24-2009, 11:12 AM
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Sorry, too busy jamming to some Allman Bros. I'll have to get back to you on that.
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