The VC4 models are specifically designed for new residential construction and multi-family applications. CFC-free LGWP R-454B refrigerant delivers environmentally friendly performance with zero ozone depletion. Diagonal base valves with open access for low-loss fittings, straight tubing for flexibility in line set connections, single panel access to the electrical controls, swing out control box for full corner access, and removable fan guard allow easy access for unit maintenance. Compressors are protected internally by a high pressure relief valve and a temperature sensor, and externally by the system high pressure switch. The liquid line filter-drier is loose shipped for field installation by the contractor to protect the system and compressor against moisture and debris. These outdoor units are specifically designed to be matched with indoor coils, furnaces, and air handlers to provide a complete system solution.