The question this page answers
What does old component relationship establish in this file, and what additional fact could change the next step? A mechanical system serves spaces with different uses and ownership arrangements.
Match the item to a stable physical reference
Use a location or component identifier that can be traced across plans, photographs, invoices and schedules. Record the actual function and the boundary of the item. Similar descriptions do not prove that two rows refer to the same asset.
Apply the check to the situation
A mixed-use building has a common system plus dedicated cooling for an equipment room.
For this check, identify the document that supports old component relationship. Compare it with installed cost support before treating the two records as consistent. A difference may indicate separate events, incomplete history or a correction that has not yet reached every system.
Compare sources before accepting the result
Compare what is physically present with what each document describes. Identify retained, replaced and shared portions separately. Explain splits or combinations in a mapping table rather than creating unexplained new identifiers.
Handle an incomplete or conflicting file
A location match supports traceability; it does not decide classification or recovery period. Give the technical reviewer the installation facts, source cost and prior history needed to evaluate the actual item.
| Evidence state | Action for this check |
|---|---|
| Supported and consistent | Record the source version and exactly what it establishes about old component relationship. Leave the tax conclusion to the responsible reviewer. |
| Missing | Request the underlying evidence and assign a follow-up owner. Identify whether the missing item prevents review or only delays implementation. |
| Conflicting | Keep both sources, describe the difference and request an explanation. Do not silently choose the source producing a preferred outcome. |
| Estimated | Explain the reconstruction method, uncertainty and reviewer approval required before using the estimate. |
| Proposed not applicable | Record why this question does not apply and obtain confirmation where the decision depends on that exclusion. |
The focused reviewer handoff
Submit the source reference, the finding about old component relationship, the unresolved difference and the requested decision. If the reviewer approves an action, ask what proves its completion. Continue with technical classification review to check the connected part of the file.
Read the full cost segregation hvac service boundaries guide for the broader context and primary guidance.