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SAP 10.2 Appendix N3.5 Table N4 (PDF p.107) — heat-pump packages
with fixed daily heating durations:
- "24" → N24,9 = 365 (continuous): every day at heating temperature,
no off period → (days_in_month, 0) per month → MIT_zone = Th.
- "16" → N16,9 = 365 (unimodal, 0700-2300): every day with single
8h off → (0, days_in_month) per month → MIT_zone = Th − u1(8h).
- "9" → standard SAP schedule (bimodal 7+8 off): falls through to
`None` so the orchestrator applies the legacy bimodal path.
Cert 9418 (Daikin Altherma EDLQ05CAV3, PCDB 102421) lodges
`heating_duration_code = "24"` — worksheet (87) MIT_living = 21.0
every month (= Th1, no off period) and (90) MIT_elsewhere collapses
to Th2 directly. Pre-fix the bimodal cascade produced MIT ~17.8-19.8
(2.04°C low at Jan) and SAP was +2.20 over worksheet 84.6305.
Post-fix cert 9418 closes to SAP Δ +0.0296 (from +2.20) — the
residual is consistent with the same ~0.05 PSR-formula drift seen
in 5/7 cohort certs sharing PCDB 104568.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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