FA-92665 / HVAC thermostat control / Member archive

Degree-minute integral is not clamped · case 05

After a long surplus the compressor takes a very long time to restart, and deep deficits wind up without bound.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Hydronic heat pump degree-minute controller, one sample per minute of [supply_temp, target_supply] in whole F. Degree-minutes DM accumulate supply - target each minute and are clamped to [floor, 100]. The compressor starts when DM <= start_dm and stops when DM >= stop_dm. Auxiliary heat starts when DM <= aux_dm and stops when DM >= start_dm. Decisions use the DM value after this minute's update. Return [DM, compressor, aux] 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: scenario 5	`[[-24, false, false], [-54, false, false], [-77, true, false], [-97, true, false], [-126, true, false], [-146, true, false], [-82, true, false], [-20, true, false], [43, false, false], [100, false, false], [161, false, false], [223, false, false], [278, false, false], [341, false, false], [400, false, false], [461, false, false], [438, false, false], [415, false, false], [389, false, false], [416, false, false], [448, false, false], [482, false, false]]`	`[[-24, false, false], [-54, false, false], [-77, true, false], [-97, true, false], [-126, true, false], [-146, true, false], [-82, true, false], [-20, true, false], [43, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [77, false, false], [54, false, false], [28, false, false], [55, false, false], [87, false, false], [100, false, false]]`	Failed

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