855773667-LEED-v5-O-M-Reference-Guide-Launch-Edition-1 - Page 138

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per manufacturer’s specifications or confirm that the manufacturer’s default charge or referenced submittals already account for this additional charge.

Calculate the equipment GWP for each equipment using Equation 1.

Equation 1. GWPEQUIPMENT calculation

calculation

𝐸 𝐸 𝐸 𝐸 𝐸𝐸 [= 𝑅] 𝑅 𝑅 𝑅 𝑅 𝑅 𝑅𝑅 𝐺 𝐺𝐺 [× 𝐺] 𝐺𝐺

The project’s total GWP is the sum of the GWPs for all refrigerant-using equipment in the inventory:

Equation 2. GWPTOTAL calculation

𝑇 𝑇 𝑇𝑇 𝐸 𝐸 𝐸 𝐸 𝐸𝐸 𝐺 𝐺𝐺 = � 𝐺 𝐺𝐺

Determine the weighted average GWP for the inventoried equipment by dividing the total GWP by the sum of refrigerant charge for all equipment:

Equation 3. Weighted average GWP calculation

𝑇 𝑇 𝑇 𝐺 𝑊𝑊𝑒𝑒𝑖 ℎ𝑡 𝑡𝑡 𝐴 𝐴 𝐴 𝐴𝐴 𝐺 𝐺𝐺 = [𝐺] 𝛴 𝛴

REFRIGERANT LEAKAGE INSPECTION

For inventoried equipment, check for refrigerant leaks in the system. Leak check inspections may leverage electronic leak detectors, data from the building automation system, visual inspections for oil residue on joints or for bubbling from leaks after applying soapy water, audible detection of hissing or bubbling sounds, and/or pressure testing.

REFRIGERANT RECHARGE

All leaks, even minor ones, can cause performance issues with HVAC and refrigeration systems and impact the air quality of the mechanical room and surrounding spaces.

Where refrigerant leakage is observed, teams must recharge equipment and track how much refrigerant was needed to fully recharge the system. Teams can then determine the leakage rate percent using the total recharge amount.

If the leak exceeds the applicable trigger rate within EPA Standard 608, EU F-gas regulations, or other applicable codes, project teams must repair the leak within 30 days or as otherwise indicated in the legislation. For the U.S., a 10% annual leak rate trigger will apply to most large

U.S. Green Building Council LEED v5 Reference Guide for Operations and Maintenance, April 2025 Launch Edition 128