When newer technologies or techniques meet older codes written for an earlier version of engineering reality, the losers are the users and occupants. VRF use is growing — find out how that growth is being hampered by various codes addressing energy, piping, refrigerants, and electrical design.
Variable refrigerant flow (VRF) HVAC is quickly taking over market share of the industry for commercial buildings. VRF is among the highest efficient HVAC systems. VRF allows an engineer to provide customers with a very energy efficient HVAC system with exceptional comfort and flexibility. Several building codes, however, prevent this highly efficient technology from being installed because of the first cost premium that offers no benefit. The building codes discussed in this article include NEC Article 220.84, the Energy Code section on economizers, IECC 503.3.1, and the mechanical code, Chapter 11.