After several months of focusing on other projects I am back to working on the geothermal system. I have not been able to do a wiring drawing because I am having problems with my cad program. For the most part it is simple enough but I am not fully understanding the reversing valve/ 3-way valve wiring. The HBX eco550 has 2 terminals (5 & 6) for the heat pump, and 2 terminals (18 & 19) for the reversing valve. The heat pump has 3 terminals- Y1 compressor, R 24V and O/W2 cooling. The Belimo 3-way valve actuators I have both have end switches. They have terminals 1, 2, 3 for the valve and S1, S2, S3 for the end switch. If anyone can help me understand this I would appreciate it very much.