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

KR Services
Infrared
SYSTEM DESIGN
HVAC Tech

Off-the-Charts "CONTRACTOR MODELING SPREADSHEET"
FOR RESIDENTIAL 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 !!

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.

You can then proceed with duct sizing, permit filing, etc.,
without having to wait on your suppliers' inventory report.
You could also find and change your Brand selection and model numbers easily, 
at any later time with this same program.

THE CURRENT VERSION (v16.80.##) OF THIS PRODUCT ALLOWS ENTRY
OF
FIVE HVAC SYSTEMS FOR ONE ADDRESS!

HERE'S WHAT THE RESULTS TABS LOOK LIKE:

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 minor revisions sent out the first year.

The 5 HVAC System price is $125.00 FOR ONE COMPUTER 

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

 

MORE PRODUCT INFORMATION:
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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