I'm a mechanical designer. I'm specifying American Standard two-stage 3-ton heat pumps on two projects this week. I'm much more familiar with Trane's lineup.
One of the mechanical contractors being considered said the Heritage 16 was discontinued and asked for my approval to use the Platinum XM. As I understand it, the Heritage 16 (4A6H6) is equivalent to the Trane XR16 (4TWR6), and the Platinum XM (4A6H7) is equivalent to the XR17 (4TWR7). So what's the difference?
I did some digging and all four models have 2-stage scrolls, all have the open top, and all are non-communicating. What's weird is that all have identical AHRI ratings when combined with TAM8, at least for the 3 ton model -- 18 SEER/13 EER/9.0 HSPF. Here are AHRI refs if anyone cares to check...
4773501 - Heritage 16
5774446 - Platinum XM
5456952 - XR16
5776132 - XR17
At the risk of further confusing matters, I found a submittal for an earlier version of the Heritage 16 on the net, and it had AccuLink and open top. To my knowledge, AmStd models are identical to Trane, and Trane's communicating model (XL16i) has the closed top, right? I also saw in another thread here that the XR16 was single stage at some point. I really wish Trane/AS wouldn't do this sort of stuff!
Both companies' websites show both models (16/17) as being current (although past experience suggests that doesn't mean much). I grabbed the latest submittals for the XR16 & XR17 from comfortsite and every detail is identical except sound ratings, including net weight. I bet the prices aren't the same!
So what's the scoop? Has the Heritage16/XR16 been discontinued and replaced with the XM/XR17 like the dealer said?