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Selecting HVAC systems using OEM data – Not AHRI: ACCA
Manual S equipment sizing.
 At
Savoy Engineering Group we perform hundreds of
residential ACCA Manual J, S & D HVAC designs each year
throughout the United States. We also review HVAC
designs performed by others. Often it is either the
homeowner/contractor/builder/architect that does not
trust the results they received or a lawsuit may be
involved.
What we see throughout the HVAC industry is people not
sizing HVAC equipment with the manufacturers’
performance data (OEM data). We NEVER see a Manual S
compliance report included. We look at a lot of both
Elite & WrightSoft reports and no one includes. While we
see a lot of errors in the Manual J reports, the trend
of improperly sized equipment is far more troubling. We
ALWAYS use OEM data – not AHRI.
When we send our client the completed ACCA certified
Manual J load calculation, we ask them to send us the
make/model & OEM data for the indoor coil, outdoor
condenser and furnace. More often than not we receive
equipment way oversized and AHRI #. For example, we
completed a job that required 5 tons of cooling total
and the client sent back a quote for two 4-tons and a
5-ton unit.
We also perform many Arizona HVAC designs and we often
have HVAC contractors who send us the AHRI certificate.
We are happy to walk our clients through the Manual S
process but many do not understand or simply don’t care
to invest the time needed to master the Manual S sizing
theory.
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