H
Heating, Ventilation, and Air Conditioning
� Conduct a detailed analysis of moisture loads to determine if there is a need for a central dehumidification control system( i. e., a separate dehumidification system or a humidistat controlled variable speed air conditioning unit).
� Where needed, install a humidity control system to maintain humidity ratios below 0.012( lb. water vapor / lb. dry air), per Section 52.2 of ASHRAE Standard 55-2004.
Humidity control equipment should be selected to maintain maximum humidity levels based on the summer design indoor air temperature, as shown in the following table:
Thermal Environment Conditions for Required Humidity Comfort Control |
Summer Indoor Design Temperature(° F) |
Relative Humidity(%) |
Humidity Ratio( lb. water vapor / lb. dry air) |
70 ° F |
76 % |
0.012 |
74 ° F |
66 % |
0.012 |
78 ° F |
58 % |
0.012 |
82 ° F |
50 % |
0.012 |
VERIFICATION Field Verification: The Rater will conduct field compliance verification. Documentation: The Rater must collect the following:
INTENT
� �
An Accountability Form signed by the mechanical engineer or other responsible professional A report of analysis of moisture load and calculations for dehumidification strategy
To improve indoor air quality in high humidity climates.
H10. REGISTER DESIGN MEETS ACCA MANUAL T
CRITERIA FOR QUALIFICATION Note: This measure applies only to single family homes.
One point of credit is available for installing supply and return registers and grilles according to ACCA Manual T.
VERIFICATION
DRAFT
Documentation: The Rater must collect the following: � �
An Accountability Form with measure criteria signed by the mechanical engineer or other responsible party Specifications for supply and return grilles according to Manual T
DRAFT GreenPoint Rated New Home Rating Manual Version 6.0, September 2013 57 © Build It Green