FA-92837 / HVAC thermostat control / Member archive

Zone dampers open for zones calling the opposite mode · case 02

A zone calling for heat receives cooled air while the system is cooling.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Zoned single-unit system arbitration per minute; each sample maps zone -> heat, cool or None. When idle the system picks the mode with more calling zones (ties go to heat). A mode ends when no zone calls for it, and a new mode may be chosen in the same minute. If zones call for the opposite mode, the system switches once the current mode has run max_run minutes, restarting the run timer. Dampers open only for zones calling the active mode. Return [mode, sorted open zones] per minute.

Why this case matters

Residential and light-commercial thermostats make these decisions sample by sample; each defect changes equipment calls in a way that shows up as short cycling, comfort complaints or equipment stress.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: tie goes to heat	`[["heat", ["a", "b"]], ["heat", ["a", "b"]], ["cool", ["b"]]]`	`[["heat", ["a"]], ["heat", ["a"]], ["cool", ["b"]]]`	Failed

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