Trane 90% to (2) American Standard 95%, Relocate
This customer of mine had a Trane 90% furnace that was zoned. 1 Zone for up stairs and 1 for down stairs. It appears the system was designed correctly, but after digging deeper into the system we found it was not installed correctly. The poor installation contributed to the failure of the furnace.
After several conversations with my customer we had decided to move the furnace location and remove the zoning all together. Each floor would have its own American Standard 95% 2 stage variable speed furnace and duct system. In my opinion this should have been done to begin with.
The existing furnaces secondary heat exchanger was getting clogged and also was showing signs of external condensation on the heat exchanger. During the installation I found out why.
In the picture above your actually seeing into the return air system, its not uncommon to use chases or voids for return ducting. It is uncommon but not rare though for the return air to be blocked by insulation. During construction an insulator had no idea he was blocking the return by insulating the interior wall. By doing so all of the return air was being pulled from outside, during the winter this cold air would cause condensation on the heat exchangers and cause outrages heating bills.
The new location had to be dug down to allow for the 2 new American Standard 95% furnaces. Above you see the area before we started.
It was decided to add a block wall to help clean up the area and hold the soil back.
As you can see the new American Standard furnaces where placed on cladlite pads, ducting was divided from up stairs and down stairs then connected to the appropriate furnace. Honeywell 4″ pleated filters where used for filtering.
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