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Old 06-04-2010, 02:33 PM   #1
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Choosing a Replacement Heat Pump


Iím replacing my 25 year old Carrier 3.5 ton split-system heat pump with a new high efficiency unit that will qualify for the 30% tax credit. My home is approximately 2,000 sq.ft. (single level) with a half basement which I plan to finish out shortly. Trying to stay within budget Iíve narrowed my search to the following two units.

Trane XR15 Series:
4 ton heat pump model 4TWR5048
5 ton variable speed air handler model 4TEE3F65
TCONT-803 thermostat with de-humidification control.
(Note: Trane website shows I must use the 5 ton air handler to qualify for the tax credit.)

Carrier Performance Series:
4 ton heat pump model 25HPA548003
4 ton variable speed air handler model FV4BNF005T00
Honeywell TH832 thermostat with de-humidification control.

The quotes I've gotten from dealers contain very few specifics and they seem to be averse to answering a lot of questions. Does anyone know if user manuals for these units are available on-line where I might get additional information? Any thoughts as to the better choice for my application?

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Old 06-04-2010, 04:51 PM   #2
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Choosing a Replacement Heat Pump


The 803 and TH8321 are the same thermostat, just the 803 is relabeled as a Trane product. It is a poor stat to use for humidity control. It can only over cool to dehumidify.

The Trane 900, or YTH9421 is a better thermostat, as it can slow down the VS blower on calls to dehumidify, and during normal cooling runs to prevent the humidity from increasing.

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Old 06-07-2010, 09:42 AM   #3
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Choosing a Replacement Heat Pump


Quote:
Originally Posted by beenthere View Post
The 803 and TH8321 are the same thermostat, just the 803 is relabeled as a Trane product. It is a poor stat to use for humidity control. It can only over cool to dehumidify.

The Trane 900, or YTH9421 is a better thermostat, as it can slow down the VS blower on calls to dehumidify, and during normal cooling runs to prevent the humidity from increasing.
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I was of the impression that since the XL-900 thermostat uses Trane's communication link, it would only work with the XL series heat pumps. I'm not considering the XL series since they don't qualify for the federal tax credit.
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Old 06-07-2010, 10:05 AM   #4
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Choosing a Replacement Heat Pump


The indoor unit must be a communicating unit. But the outdoor doesn't have to be.

The IAQ(YTH9421) will work on any of the trane units though.
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