FA-92663 / HVAC thermostat control / Member archive

Degree-minute integral is not clamped · case 03

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

Member previewVariant 3 · 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 1	`[[-26, false, false], [-49, false, false], [-70, true, false], [-98, true, false], [-122, true, false], [-152, true, true], [-176, true, true], [-204, true, true], [-228, true, true], [-249, true, true], [-273, true, true], [-301, true, true], [-321, true, true], [-351, true, true], [-371, true, true], [-400, true, true], [-420, true, true]]`	`[[-26, false, false], [-49, false, false], [-70, true, false], [-98, true, false], [-122, true, false], [-152, true, true], [-176, true, true], [-204, true, true], [-228, true, true], [-249, true, true], [-250, true, true], [-250, true, true], [-250, true, true], [-250, true, true], [-250, true, true], [-250, true, true], [-250, true, true]]`	Failed

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