Consider the following information when replacing a VMA 1410, VMA 1415, VMA 1420, and the VMA 1440 controller with a VMA18 controller.
The VMA 142x controller has five binary outputs (BOs) and internally supplies 24 VAC. The VMA18 controller has three binary outputs (BOs) and supplies 24 VAC to these BOs. The VMA18 controller has two configurable outputs (COs) and these two COs require an external low voltage power source. Refer to Variable Air Volume Modular Assembly (VMA) 1400 Series (LIT-635058) for the Input/Output (I/O) point differences between the VMA1410 and VMA1420.
See the following figure for wiring instructions.
