|
Posted by Tony Hwang on July 19, 2006, 10:22 am
MDT at Paragon Home Inspections, LLC wrote:
> This one may be pretty tricky. My guess, offhand, is that the
> thermostat might not have been "defective" in the sense of a
> manufacturing defect, but rather that this might have been a design
> defect: that it was possible to program the heat and cooling
> set-points such that the thermostat could call for both simultaneously.
>
> If so, a system might operate fine as long as 'stat was in ether the
> "heat" or "cooling" mode (which is how it would likely be
> tested during installation) but if it was switched it to the "auto"
> mode afterwards, both might be active
>
> I can see how an HVAC contractor or Home Inspector could easily "miss"
> this unless they had a prior reason to test for it - both would likely
> force the system directly into the 'stats "heating" and "cooling" modes
> as required for routine testing - and I'd have to agree that it's
> unreasonable to "expect" a typical homeowner to detect the problem
> other than in the form of a high electric bill.
>
> Michael Thomas
> Paragon Home Inspection, LLC
> Chicago, IL
> mdtATparagoninspectsDOTcom
> 847-475-568
>
Hi,
In design aspect that can't happen. In auto mode it's either cool or
heat, not both. ASIC can't do both at the same time.
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap