Prescriptive compliance approach –

1. Zonally controlled systems are not required, but if installed must meet mandatory airflow and fan efficacy requirements using slightly different test methods than for single speed and variable speed compressors.
2. Bypass ducts/dampers are not allowed.

Performance compliance approach –

1. Zonally controlled systems must be modeled then installed.
2. Bypass dampers are allowed only if modeled and indicated on the CF1R.
3. Dual speed/multi speed condensers may also qualify for a credit (at 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.