Prescriptive compliance approach –
1. Zonally controlled systems are not required, but if installed must meet mandatory AF/FE requirements (slightly different test methods for single speed and variable speed compressors)
2. Bypass ducts/dampers are NOT allowed.
Performance compliance approach –
1. Zonally controlled systems must be modeled if installed.
2. Bypass dampers allowed only if modeled.
3. Dual speed/multi speed condensers may also qualify for a credit (reduced penalty) and if modeled, must be installed.
Note: when a feature is “modeled” using the performance compliance approach it will appear on the certificate of compliance.