Arkansas HVACR NewsMagazine March 2022

HVACR NewsMagazine March 2022

Tech News

seen multiple compressor failures and replacement made without recognizing the cause for failure. Most often, compressor failure is related in some way to inadequate air flow. We have heard it ad nauseam, must perform a Manual J. The only instance where a Manual J can be repeated without additional inputs is when the home is repeated in similar orientations Appropriate Manual J-

HVAC Air Flow Performance

Part Five of Five-

Tom Turner, Air Evangelist

As the last installment of a Five-part series, we will summarize all we have discussed in the previous Four articles.

Plug and play hardly describes the trade of HVAC but too often equipment is replaced or installed with little more than a cursory review. Like for like does not happen often. Each time we install new HVAC equipment, we can bet the capacity of

equipment is different, regardless of the nominal tonnage marked on the package. The only incident where we can treat the HVAC system change out, as a plug and play operation, is when same generation equipment is replaced, and the charge was initially weighed in. We must also remember there is a reason the initial equipment install failed. As you can see, we should treat every installed unit as the new piece of equipment with an assessment prior to installation. We have

in a new subdivision with new construction. This of course it includes similar shading orientations. Every home is different, and we must realize that complexity of construction materials and their implementation in differing areas by different builders who have totally different views on construction. We must investigate every home and what went in it when it was built.