A.15.9:5.2 - A heat-pump choice needs one acoustic result

An engineering team is choosing a compressor operating region. It already has a general product noise rating, but the decision concerns tonal noise in a named room, mounting configuration, and speed range. The general rating is useful source material but is not qualified for that use.

Suppose the existing qualified operating region remains available, but the proposed region could meet an important capacity need before the controller choice. The acoustics team can answer the configuration-specific question in that window using an available test setup; the expected gain over keeping the existing region warrants the preparation, test, interpretation, and delay together. This case premise selects acquisition; a general rating or merely cheap test would not do so.

The team requests: “For the controller decision, return the observed tonal-noise and vibration limits for this compressor, mounting, room, and speed range, with the tested conditions and unsupported region. A supported limit, objection, or missing-test blocker is useful; the acoustics result does not choose the controller.” The acoustics practice keeps its Method and evidence rules; the engineering team keeps the architecture decision. If the question later becomes which complete internal, provider, reuse, or redesign way can make the same accepted control result available, leave this one-contribution question and use C.38.