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Posted by thrugoodmarshall@hotmail.com on August 16, 2006, 12:24 pm
John D wrote:
> I recently purchased a house that has a 1994 Trane XL 1400 heat pump. It's
> been checked out and as far as I know everything is working properly.
>
> My question concerns the secondary "thermostat" that is supposed to adjust
> the humidity in the home. Other than off, it has three settings- low,
> comfort, and high. I have a basic understanding of how A/C works from years
> in the auto trade but cant grasp how this would be accomplished. Does the
> unit have circuitry that adjusts the pressures based on the setting or have
> different blower speed/duration settings? Does it work at all?
>
> Thanks is advance for any info
Normally, the blower runs high speed during the cooling cycle.
Where multiple speeds are supported (like your unit), the blower is
typically run at a lower speed during dehumidification.
Your unit supports multiple speeds during the cooling cycle, if the
humidistat is installed.
The secondary "thermostat", BAYSTAT253 is a humidistat, used for that
purpose.
Ref trane pub 22-1711-02-0102 (EN), p19, note 7 for wiring the
humidistat.
Without a multi speed blower, a regular cooling cycle will still
dehumidify.
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