FA-92664 / HVAC thermostat control / Member archive

Degree-minute integral is not clamped · case 04

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

Member previewVariant 4 · 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 2	`[[12, false, false], [74, false, false], [138, false, false], [195, false, false], [201, false, false], [210, false, false], [223, false, false], [236, false, false], [247, false, false], [257, false, false], [264, false, false], [276, false, false]]`	`[[12, false, false], [74, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false], [100, false, false]]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.