Air Conditioning Contractors of America

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1 Air Conditioning Contractors of America

2 WHO IS ACCA????

3 Industry Manuals Residential D, J, S, H, RS, T, P A manual J load calculation is a measurement of how much heating and cooling capacity a home will need under project design conditions Manual T (Air Distributions Basics for Residential and Small Commercial Buildings) This volume is for the proper sizing/selection of registers, diffusers, and grilles so that thermal comfort and noise concerns can be properly addressed. Manual D: (Residential Duct Systems) Proper Duct design and layout. Manual S: (Residential Equipment Selection Manual) This manual shows how to properly use OEM comprehensive performance data to select heating and cooling equipment to properly meet the Manual J load requirements.

4 What happens when a heating & cooling system is oversized? Increased system installation costs Short cycling Shortened equipment life Decreased efficiency=increased energy bills Increased service calls Moisture problems Uneven temperatures Occupants feel and look cold and clammy Uneven heating or cooling of spaces Increased sound

5 Reading a Manual J & S Load Calculation 12,000 BTU s = 1 Ton Latent Cooling Load Sensible Cooling Summer Design Conditions Cooling Equipment Summary Equipment Total Load Required Total Capacity.70SHR

6 Sensible Cooling Load Sensible Cooling Load is heat due to heat conduction, convection and radiation from the exterior to the interior Glass windows or doors Sunlight striking windows, skylights, or glass doors and heating the room Exterior walls Partitions (that separate spaces of different temperatures) Ceilings under an attic

7 Sensible Cooling Load (cont d) Sensible Cooling Load is heat due to heat conduction, convection and radiation from the exterior to the interior Roofs Floors over an open crawl space Air infiltration through cracks in the building, doors and windows People in the building Equipment and appliances operated in the summer Lights

8 Latent Cooling Load Latent Cooling Load is heat put into the air by moisture People Equipment and appliances Air infiltration through cracks in the building, doors and windows

9 Requirements Without a manual J calc. a system will most likely be OVERSIZED Require Manual J load calculation be done room by room Require design temperatures not be adjusted from 68 and 76 degrees, and seasonal temperatures not change from 22 and 91 degrees and 113 Summer Grains of Moisture (3% design criteria) Require that the make and model numbers of proposed equipment be included in the proposal Require sealed ducts to perform at < 6 cfm to outside per 100 sq. ft. List this as a Performance Requirement Require proper commissioning to be done during cooling season with Super Heat and Cooling charge Require product literature to be left near the mechanicals for future service.

10 Compare Load Calculations to Equipment on the Proposal

11 Compare Load Calculations to Equipment on the Proposal

12 Compare Load Calculations to Equipment on the Proposal

13 Decipher Correct Size from Model Numbers or Rated Load Amperage (RLA) Equipment size interpreted by deciphering the model number on cooling equipment in tonnage Cooling equipment tonnage is divisible by 12, for example 24=24,000 Btu=2 tons RLA is listed on data plate of eqpt. and a reciprocating compressor will be rated at 5-8 amps per ton. This is an approximation as newer high efficient units will be on the lower end of the scale To verify correct coil to condenser matching request an ARI rating sheet

14 Compare Load Calculations to Equipment on the Proposal

15 Example of an ARI Rating sheet

16 A/C Commissioning, Start-up, QIV (Quality Installation Verification) Proper commissioning to be done after the home is occupied and the system has been operating during cooling season The process of inspecting a new air conditioning installation and verifying that the new system is running efficiently. Technician will visually inspect: Ducts Wiring Conduit Runs Fans Supply Voltage Safeties Thermostat Settings

17 Adjust Refrigerant Charge Check and adjust the airflow Measure the static pressure Check and adjust the refrigerant charge SuperHeat and SuperCool need wetbuld temp Beer can cold is not good enough!

18 Field Adjusted SEER [SEERFA] HVAC BEST PRACTICE INSTALLATION Courtesy of Advanced Energy Corp. Typical Installation Rated SEER

19 Field Adjusted SEER [SEERFA] HVAC BEST PRACTICE INSTALLATION Courtesy of Advanced Energy Corp. Typical Installation Rated SEER

20 Field Adjusted SEER [SEERFA] HVAC BEST PRACTICE INSTALLATION Courtesy of Advanced Energy Corp. Typical Installation Rated SEER

21 Field Adjusted SEER [SEERFA] HVAC BEST PRACTICE INSTALLATION Courtesy of Advanced Energy Corp. Typical Installation Rated SEER

22 Field Adjusted SEER [SEERFA] HVAC BEST PRACTICE INSTALLATION Courtesy of Advanced Energy Corp. Typical Installation Rated SEER

23 Field Adjusted SEER [SEERFA] HVAC BEST PRACTICE INSTALLATION Typical Installation Courtesy of Advanced Energy Corp. Rated SEER

24 Field Adjusted SEER [SEERFA] HVAC BEST PRACTICE INSTALLATION Typical Installation Courtesy of Advanced Energy Corp. Rated SEER

25 Right-Sizing Air Distribution HVAC QUALITY INSTALLATION CHECKLISTS: HVAC QUALITY INSTALLATION Equipment (ACCA Manual J/S) Ducts (ACCA Manual D) Terminals (ACCA Manual T) Duct Leakage Static Pressure Flow Across Coil Air Flow Refrigerant Charge Duct Installation Testing TXV Valve Installation R-8 Ducts in Attic Leakage to Outdoors and Total Pressure Balancing

26 The Essential Contacts To order ACCA materials or products call: (888) or Go to and select the ACCA Online Store To learn more about ACCA materials or products: Contact Chris Hoelzel at: (703) or To learn more about ACCA Student Chapters: Contact Kimya Cajchun at: (703) or To learn more about ACCA s Workforce Development: Contact Michael Honeycutt at (518) or

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