Home of Off-the Charts* 
(FOR WHOLE SYSTEM DESIGN CD-ROM CLICK HERE)
ACCA manual S *Patent Pending
                                                                                                                                                                               Eli

KR Services
Infrared
SYSTEM DESIGN
HVAC Tech

Off-the-Charts "CONTRACTOR MODELING SPREADSHEET" (OTC),
AN ALTERNATIVE METHOD TO
ACCA'S MANUAL S, 
FOR RESIDENTIAL HVAC 
EQUIPMENT SELECTION

(only for use AFTER a residential load calculation is performed)

Note: This is a new updated version for Windows 8.1 and Windows 10!

Note: Any OTC version older than 15.85 is not valid for accuracy !!
For
upgrade requests please click the star

ICC CODE REQUIRES USE OF AN ACCA MANUAL S
"OR OTHER APPROVED HEATING AND COOLING CALCULATION METHODOLOGIES" FOR THIS TASK. 

THIS "APPROVAL" IS FROM THE BUILDING CODE OFFICIAL, NOT ACCA.

NOTE TO CODE OFFICIALS:
THIS PRODUCT IS INTERPOLATING FOR: 
OUTDOOR TEMPERATURE, INDOOR TEMPERATURE, INDOOR R/H, INDOOR CFM, COIL BYPASS FACTOR, ALTITUDE, and LOAD CALCULATION SENSIBLE / LATENT RESULTS; in the same way manufacturers create their expanded data charts from AHRI data. 

(please feel free to email krservices@cox.net with any technical questions.)

But unlike ACCA Manual S, 
with OTC you only have to enter your design conditions, 
and the AHRI RATING of what you want to use,
and you will see whether you've made
the right choice. 

You can then adjust your airflow,
to possibly match it closer to the latent / sensible needs from your heat load,
and you're done.

If you have manufacturer data,
you can also fine tune the OTC output to it if desired,
or verify whether IT is corrupt.

The accuracy of results with OTC is more predictable than when using manufacturer expanded data, 
which ACCA claims can also be corrupted. ACCA's Manual S prescribed method is more likely to cause errors, if an average imperfect human has to 
examine and precisely copy MULTIPLE BTU/hr figures from charts, over to into interpolation tools. 

With OTC you can then proceed with duct sizing, permit filing, etc., without having to wait on your suppliers' exact equipment inventory report.

You can also find and easily change your Brand selection and model numbers, at any later time with 
this same program, without having to locate more expanded data, which is what you have to do 
with the ACCA manual S prescribed method.

THE CURRENT VERSION (v17.45.##) OF THIS PRODUCT ALLOWS ENTRY
OF
FIVE HVAC SYSTEMS FOR ONE ADDRESS!

HERE'S WHAT EACH SYSTEM RESULTS TAB LOOKS LIKE: 
(newer versions may vary)

There are no annual fees, per use fees, 
you OWN this software. You will be sent a license key
after purchase. There is no charge for any revisions
available in the first year after purchase.


The 5 HVAC System price is $150.00 FOR ONE COMPUTER 

To download FREE 30 day trial, or purchase, and install, instructions and videos  Click the star

 

 

MORE PRODUCT INFORMATION:

Videos for program usage 
 
Click the star

Using OTC with Elite's Rhvac program  
Click the star

The science of "Equipment Selection"  
Click the star

Compliance of OTC with Codes
and Other Standards 

 Click the star

Frequently Asked Questions about OTC
 Click the star

Why Expanded Data Charts are a Joke!
 Click the star

not approved by ACCA Manual S

 

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