SystemIdentifier attributes

[shorowit]

Replaces the sameas attribute with pre_retrofit_id to better clarify how the attribute is intended to be used. The attribute description is: "Use to reference the id of the matching object on the base (pre-retrofit) building where the object has not been replaced."

Adds a new duplicate_id attribute with the description: "Use to reference the id of the same object on another multifamily unit (e.g., a single central boiler or common wall described in multiple multifamily units)."

[shorowit]

Some software may be using sameas even for situations where the element (e.g., HVAC system) is replaced, or for an AC/furnace->HP situation. Concerns about the "where the object has not been replaced" part of the description; should that be stricken?

Alternatives to pre_retrofit_id... base_id or upgraded_id?

Needs further discussion.

[nmerket]

🎥 Discussion in HPXML Working Group Meeting 2024-03-14