DRAFT GreenPoint Rated Existing Home Rating Manual version 6.0 | Seite 72

H

Heating, Ventilation, and Air Conditioning Use the latest editions of all Manuals, or equivalent. Outdoor and indoor cooling coils shall be specified to match per manufacturer and the Air-Conditioning and Refrigeration Institute’s (ARI) specifications. For homes that use radiant heat and no air conditioning, design radiant or hydronic space heating systems using industry-approved guidelines, such as Manual J, the Guidelines for the Design and Installation of Radiant Panel Heating and Snow/Ice Melting Systems by the Radiant Panel Association, the Heat Loss Guide (H22) by the Hydronics Institute Division of the Gas Appliance Manufacturer’s Association (GAMA), or equivalent accredited software. VERIFICATION Field Verification: The Rater shall conduct field observations to verify that the plan was implemented. Documentation: The builder and/or mechanical contractor shall provide documentation in the form of building-specific calculations and mechanical plans that incorporate the requirements of Manuals J, D, and S. INTENT To improve the performance, energy efficiency, and comfort of conditioned space by right-sizing equipment and ducts. To reduce construction and operating costs.

H4.

HIGH PERFORMING ZONED HYDRONIC RADIANT HEATING SYSTEM

CRITERIA FOR QUALIFICATION Two points of credit are available for the installation of a high performing hydronic radiant heating system that meets all of the following criteria: ? ? The heating load must be calculated using Air Conditioning Contractors of America (ACCA) manual J or another approved load calculation method. The hydronic heating system must be designed using industry-approved guidelines, such as the Guidelines for the Design and Installation of Radiant Panel Heating and Snow/Ice Melting Systems by the Radiant Panel Association, the Heat Loss Guide (H-22) by the Hydronics Institute Section of AirConditioning, Heating, and Refrigeration Institute (AHRI), or equivalent accredited software. If the home is on a heated slab, the slab must be insulated according to the California Energy Code (CEC), Subchapter 2, Table 118-A. This includes insulating the edge of the slab and possibly the first four feet horizontally from the outside edge of vertical insulation. The hydronic radiant systems should be divided into zones (at least one zone per 500 feet if the space is greater than 600 square feet). The system uses variable speed pumping or zoned valving. The radiant hydronic system is paired with a condensing water heater or boiler for temperature modulation, rather than a tankless water heater. An outdoor reset thermostat that regulates the system based on outdoor conditions is installed. All pipes outside conditioned space are insulated.

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Electric heating or forced air heating systems are not eligible for this measure. Systems with a fan of any kind, including through/on the wall hydronic fan units, are not eligible for this measure. Hydronic heating systems with a cooling feature are eligible for this measure.

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GreenPoint Rated Existing Home Rating Manual Version 6.0, September 2013 © Build It Green