Johnson Controls C450CQN-4 Expansion Module 450

The Johnson Controls C450CQN-4 Expansion Module System 450 is designed to enhance the features of an existing building automation system 450. It has a standard voltage of 24 VAC and has a power consumption of only 6 VA. These features make the C450CQN-4 energy efficient and compatible with the existing systems in the market. The relay outputs of the C450CQN-4 have been increased to allow for the on/off control of two more pieces of HVAC equipment. For example, this could let you turn on/off extra heating or cooling zones, turn on/off the ventilation fans or the humidifier/dehumidifier systems.