The board relies on a 10k ohm outdoor ambient sensor and a coil temperature sensor

specifically the EK305S liquid line filter drier

It is not compliant with lead-free requirements for human consumption systems

Industrial Durability: Glass-filled nylon construction ensures stability in harsh mechanical rooms and resists the degradation common in HVACR environments

Watts 0123495 Valve 322838-754 The board relies on aThe Watts 0123495 is a professional grade 3 4 inch lead free swing check valve engineered specifically to prevent reverse fluid flow in domestic water and steam systems. As part of the Watts LFWCV series, this valve features a robust lead free brass body that meets all stringent low lead legislative requirements for potable water installations. Designed for maximum reliability in the field, it utilizes a metal to metal seal and a high integrity PTFE