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Code Cycle: 2016 Standards
Form: CF3R-MCH-20a - Completely New Duct System
CF3R-MCH-20d - Complete Replacement or Altered Duct System
CF3R-MCH-20e - Sealing of All Accessible Leaks using Smoke test
Variable refrigerant flow (VRF) systems, also known as Variable refrigerant volume (VRV) systems, can be configured to allow a single outdoor condensing unit to simultaneously drive multiple indoor evaporator coils serving either ducted and/or un-ducted zones. A common example of VRF systems are ‘mini-split’ systems.
RA18.104.22.168.3 - Measured System Airflow
HERS verification of each ducted zone is required. For each ducted zone, the target duct leakage rate shall be based on the measured airflow of that zone.
RA22.214.171.124.2 - Nominal Air Handler Airflow (not allowed)
The cooling estimate based on condenser capacity may not be used.
To report multiple ducted zones attached to the same condenser, additional ‘systems’ must be created in the project to accommodate duct leakage reporting. See the attached example below.