What must ductless mini-split systems with condensate include?

Ductless mini-split systems are designed to effectively handle condensation created during their operation. For these systems, the condensate must be managed properly to prevent water damage or drainage issues. The correct inclusion for ductless mini-split systems is the inline check valve and trap.

The inline check valve is important because it prevents backflow of condensate, ensuring that water flows away from the system and does not return, which could lead to leaks or potential damage to the unit or surrounding areas. The trap also plays a critical role by maintaining water in the drain line to create a seal that prevents air from entering, which can help avoid issues like drain line blockages or trap siphoning.

While options like a secondary overflow pipe, backup sump pump, or automatic cleaning system may be relevant in certain HVAC contexts, they do not directly relate to the fundamental requirement of controlling condensate flow in ductless mini-split systems. Hence, the inclusion of an inline check valve and trap is essential for proper condensate management in these systems.